EAST PENN Deka SOLAR Flooded System/2V User manual

Flooded Syste /2V
Installation and Operation Manual

Safety Precautions
rotective Equipment ......................................1
rocedures ......................................................1
Hazardous Elements........................................1
First Aid for Acid Splash ..................................2
Battery Location
Space ..............................................................2
Floor reparation ............................................2
Battery Racking System ..................................2
Ventilation ........................................................2
Environment ....................................................2
Distance from Operating Equipment................2
Safety Equipment
Fire Suppression..............................................2
Signage............................................................3
Eye Wash Facilities..........................................3
Battery Operation
Storage ............................................................3
Temperature ....................................................3
Depth of Discharge (DoD) ..............................3
Charging ..........................................................3
Maintenance ....................................................3
Battery Installation
Receiving a Battery..........................................3
Lifting Batteries ................................................4
Installing Batteries............................................4
Charging Safety ..............................................4
Connecting/Disconnecting Charger ................4
Battery Operation
Discharge Voltage Curve ................................5
Charge Current ................................................5
Calculating Recharge Time..............................5
Specific Gravity Readings................................5
lacing Battery into Service ............................6
Battery Maintenance
Neutralizing Acid and Electrolyte ....................6
Adding Water/Adjust Electrolyte Levels ..........6
erforming a Test Discharge ..........................7
Troubleshootin ..............................................8
APPENDIX A
Battery Maintenance Report ......................9-10
APPENDIX B
Discharge Chart ............................................11
Glossary ....................................................12-13
TABLE OF CONTENTS

1
ProtEctivE EquiPmEnt
Per EEE 450, the following protective equipment shall be worn
by personnel who perform battery maintenance work or made
available to such personnel:
a) Goggle and face shields
b) Acid–resistant gloves
c) Protective aprons
d) Portable or stationary water facilities for rinsing eyes and
skin in case of contact with electrolyte.
e) Bicarbonate of soda solution mixed 100 grams bicarbonate
soda to 1 liter of water, to neutralize acid spillage.
ote: The removal and /or neutralization of an acid spill
may result in production of hazardous waste. The user
should comply with appropriate government regulations
concerning disposal of such hazardous waste.
f) Class C fire extinguisher.
g) Adequately insulated tools
h) Barrier to prevent the spread of acid spills are
extremely important when moving cells such as during
installation or removal activities. See EEE 1578 for
information on barriers.
ProcEdurEs
The following safety procedures should be followed during
installation: (Always wear safety glasses or face shield when
working on or near batteries.)
1. These batteries contain sulfuric acid which can cause
severe burns. Sulfuric acid is harmful to the skin and eyes.
Flush affected area with water immediately and consult
a physician if splashed in the eyes. Consult MSDS for
additional precautions and first aid measures.
2. Prohibit smoking and open flames, and avoid arcing in
the immediate vicinity of the battery.
3. Do not wear metallic objects, such as jewelry, while work-
ing on batteries. Do not store un-insulated tools in pockets
or tool belt while working in vicinity of battery.
4. Keep the top of the battery dry and clear of tools and other
foreign objects.
5. Provide adequate ventilation per EEE standards and / or
local codes and follow recommended charging voltages.
6. Extinguishing media: Class ABC extinguisher.
ote: CO2may be used but not directly on the cells due
to thermal shock and potential cracking o cases.
7. nspect all flooring and lifting equipment
for functional adequacy.
8. Adequately secure battery racks to the floor.
9. Connect support structures to ground system in
accordance with applicable codes.
10. The below EEE Standards contain additional
information. Other standards may be relevant to your
specific application.
EEE 450 – Recommended Practice for Maintenance,
Testing, of Vented Lead-Acid Batteries for Stationary
Applications
EEE 937 – Recommended Practice for nstallation
& Maintenance of Lead-Acid Batteries for Photovoltaic
(PV) Systems
EEE 1013 – Recommended Practice for Sizing Lead-Acid
Batteries for Stand-Alone Photovoltaic (PV) Systems
EEE 1526 – Recommended Practice for Testing the
Performance of Stand-Alone Photovoltaic Systems
EEE 1578 – EEE Recommended Practice for Stationary
Battery Electrolyte Spill Containment and Management
EEE 1660 – Guide for Application and Management of
Stationary Batteries Used in Cycling Service
Hazardous ElEmEnts
Sulfuric Acid: The electrolyte in a lead-acid storage battery is a
diluted solution of sulfuric acid and water. Although the
acid content in the solution is only about 37%, it is still a
strong corrosive agent and can burn skin and eyes and
create holes in many types of fabric. (See Protective
Equipment.)
Explosive Gases: When a lead-acid battery is being charged, it
produces an explosive mixture of hydrogen and oxygen
gases. Make sure that all vent caps are unclogged and
securely attached so that any gas is safely vented from the
battery. Never smoke, use an open flame or create an arc
or sparks on or near a battery without first eliminating
explosive gases from the cells you’re working on.
Electricity: An electric shock hazard exists for persons who
come in contact with live parts of batteries when the volt-
age is over 50 volts. The higher the voltage, the greater the
electric shock hazard. n addition, metallic objects coming
in contact with exposed cell connectors will cause a short
and can become very hot. Even shorts involving a single
cell can become hot enough to cause severe burns.
Weight: These batteries are of significant weight. Serious injury
can occur if batteries are not handled carefully during
installation, removal or transport. Use proper lifting equip-
ment and techniques at all times.
Only trained and aut orized personnel s ould install, repair or c arge batteries.
When used properly, a lead-acid renewable energy battery is a safe, dependable source of electrical power.
However, if proper care and safety precautions aren’t exercised when handling a battery, it can be an
extremely dangerous piece of equipment.
There are four hazardous elements in a lead-acid battery: sulfuric acid, explosive gases, electricity,
and weight.

2
first aid for acid sPlasH
Eyes: Flush immediately with gently running water for at least
15 minutes. Seek immediate medical attention. For contact
lens wearers, remove the lens before the eyes are flushed.
A buffering or neutralizing agent shouldn’t be used in the
eyes without the approval of medical or safety personnel.
Skin: Wash affected area under running water and apply a
chemical burn treatment. Severe burns require immediate
medical attention.
Clothing: f large areas of clothing have been splashed or
soaked with sulfuric acid, the clothing must be removed
and the acid must be treated with non-corrosive water
based neutralizing agent (ex: baking soda / water solution),
that is user safe and environmentally compliant. After treat-
ment rinse with running water. f clothing is treated imme-
diately, chances of damage to the material are lessened.
Acid-resistant boots should always be checked before
wearing to be sure that there are no traces of acid inside.
BattEry location
When planning a battery system the following requirements
should be considered:
__ Space
__ Floor Preparation
__ Battery Racking System
__ Ventilation
__ Environment
__ Distance from Operating Equipment
__ Safety Equipment
Space
t is recommended that aisle space be provided in front of all
battery racks be a minimum of 36.0” (915mm). The design
should meet all applicable local, state and federal codes and
regulations.
Floor Preparation
t is recommended to consult with a structural engineer to
determine if the existing floor will withstand the weight of the
battery and the battery racking system. The floors in which the
battery will be located should have an acid-resistant coating
and be sloped toward a sump. Any battery spills should be
neutralized with non-corrosive, water based neutralizing chemi-
cal (ex: baking soda / water solution) that is user safe and envi-
ronmentally compliant. The area should always be washed with
clean water to remove any acid neutralizing chemical residue.
Battery Racking System
The battery should not be installed directly on a floor. There
should be some type of barrier/racking between the floor and
the batteries. This barrier/racking should be sufficient to handle
the weight of the battery. The battery racking system must
be suitably insulated to prevent sparking and eliminate any
grounding paths.
Adequate space and accessibility for taking individual
cell voltage, hydrometer readings and adding water should
be considered. f installed in an earthquake seismic zone,
battery racking system must be of sufficient strength
and anchoring. Battery rack design should be reviewed
by structural engineer.
Ventilation
t is the responsibility of the installer to provide detailed meth-
ods or engineering design required by Federal, State and local
regulations to maintain safe levels of hydrogen in battery
rooms / enclosures.
The rate of hydrogen evolution is highest when the battery is
on charge. Explosive mixtures of hydrogen in air are present
when the hydrogen concentration is greater than or equal to
4% by volume. To provide a margin of safety, battery room /
enclosure must be ventilated to limit the accumulation of
hydrogen gas under all anticipated conditions. This margin
of safety is regulated by Federal, State and Local codes and is
typically limited to 1 to 2% by volume of the battery room /
enclosure. Consult all applicable codes to determine specific
margin of safety. Hydrogen gas calculations can be determined
by using proper formulas.
Hydrogen gas is lighter than air and will accumulate, creating
pockets of gas in the ceiling. The ventilation system should be
designed to account for and eliminate this situation. Ventilation
system must be designed to vent to the outside atmosphere by
either natural or mechanical means in order to eliminate the
hydrogen from the battery room / enclosure.
Environment
Batteries should be located in a clean, cool and dry place
and isolated from outside elements. The selected area
should be free of any water, oil and dirt from accumulating
on the batteries.
Distance from Operating Equipment
Battery systems are sized based on a specific load (Amps
or Watts) for a specific run time to a specific end voltage.
Battery performance is based on these values, as measured
at the battery terminals.
For proper operation of the battery system the following
should be considered:
• Distance between battery system and operating systems
should be kept at the shortest distant possible
• Cables are to be of proper gauge to handle system loads
and minimize voltage drops.
• All cable lengths from battery system to operating system
should be of the same wire gauge and length.
The above is to ensure the battery cable used will be able to
carry the charge / discharge current & minimize the voltage
drop between equipment.
Electrical equipment should not be installed above the
batteries, because of the corrosive fumes being released
from the battery(s).
safEty EquiPmEnt
Fire Suppression
Hand-operated fire extinguishes should be available in the
battery room even if the areas are equipped with automatic
sprinkler systems. For information on extinguisher class, size
and mounting locations, consult local fire authorities or your
insurance carrier.

3
Signage
Because of the explosive gas mixtures generated while
charging batteries, anything that could ignite the gas, such as
sparks, open flames, an electrical arc, smoking, etc., must be
prohibited in the charging areas. To serve as a prominent
reminder, “NO SMOK NG” signs should be posted in all battery
room areas.
Eye Was Facilities
Emergency eye wash and acid neutralization facilities should
be located in the immediate work area for easy access. The
three most popular types of eye wash and acid neutralizing
equipment are the chemical burn station, deluge shower, and
eye wash fountain.
Consult all applicable Local, State, and Federal codes to
ensure compliance.
BattEry oPEration
There are several factors that affect the operation of the battery
concerning its ability to deliver capacity and life expectancy.
Storage
IEEE recommends:
Batteries should be stored indoors in a clean, cool, dry, level,
well-ventilated area away from direct sunlight. Typical storage
temperature range is 32°F (0°C) to 86°F (30°C).
Storage time should be limited to 3 – 6 months. t is recom-
mended the battery be fully charged and the electrolyte is at
the proper level, prior to storing. f the battery must be stored
for several months, a freshening charge should be given
whenever the specific gravity falls below 1.240. f the average
storage temperature is below 77°F (25°C), check the specific
gravity at least once every two months. f the temperature is
above 77°F (25°C), check it every month.
Batteries in steel trays without covers should be covered
with a non-conductive material to protect them from dirt,
moisture, etc. A flat sheet of rigid plastic or plywood is not
recommended. Do not drape flexible plastic sheeting over
batteries because it may trap explosive gases underneath.
ote: I batteries are to be stored or more than 6 months,
consult with nearest authorized East Penn representative.
Temperature
Many chemical reactions are effected by temperature, and this
is true of the reaction that occurs in a storage battery.
The chemical reaction of a lead-acid battery is slowed down
by a lowering of the electrolyte temperature that results in less
capacity. A battery that will deliver 100% of rated capacity at
77° F will only deliver 65% of rated capacity at 32°F.
Excessive heat will increase the natural corrosion factors of a
lead acid battery. This increase corrosion of the positive plates
contributes greatly to reducing the overall life of the battery.
Dept of Disc arge (DoD)
Depth of discharge is a function of design. The deeper the
discharge per cycle the shorter the life of the battery. A cycle
is a discharge and its subsequent recharge regardless of
depth of discharge.
System should be designed for shallow discharges. The
result of shallower discharges is typically a larger capacity
battery at prolonged battery life.
C arging
Majority of battery issues can be traced to improper charging.
mproper charging settings will lead to overcharging or
undercharging condition. Each condition will result in reduced
capacity and/ or battery life.
To ensure proper charging the inverter / charge controller
should be set to the recommended battery voltage settings. f
battery is located in an uncontrolled temperature environment,
temperature compensation should be used.
Maintenance
EEE 450 suggests batteries be checked on a monthly, quarterly
and yearly basis. Each time period requires different checks.
Maintenance log should be initiated at time of installation.
Typical checks consists of voltage & specific gravity readings
and well as visual inspections. Periodic verification of proper
gravity readings and electrolyte levels will ensure battery
being fully charged and operating properly. f any conditions
are found that are out of specifications, corrections should
be made.
A good battery maintenance program is necessary to protect
life expectancy and capacity of the battery.
BattEry installation
Receiving a Battery
After receiving a battery, examine the crate and pallet for
signs of damage. f you see any wet spots, the battery may
have been tipped or damaged during transit. Be careful when
handling a crate or packing material that’s contaminated with
spilled electrolyte. Chemical burns can result if skin or clothing
comes in contact with the spillage.
Every cell should be inspected to be sure that the electrolyte
level is above the moss shield. f the electrolyte level is slightly
below the moss shield in any cell, it can be raised by transfer-
ring a small amount of acid from higher level cells within the
battery by using a syringe or hydrometer. Do not fill with water
to bring levels to above the moss shield.
f a large amount of liquid is required to raise the level, the
cell jar may be damaged. nspect the packing material under
the tray for signs of leakage. All damaged components should
be inspected by your East Penn agent or representative.

4
Receiving a Battery cont.
Call your East Penn representative immediately. n the
meantime, keep the damaged cell’s vent cap tightly in place
and protect the floor from acid leakage. Do not attempt to
discharge or charge the battery.
Lifting Batteries
Always use the proper lifting equipment to reduce the risk of
tray damage, shorting and possible injury.
Chain hoists used to handle batteries should be equipped
with a non-metallic container or bucket to prevent the chains
from dangling and possibly causing a short by coming in con-
tact with exposed intercell connectors on the battery top. f no
protection is available, cover the battery with a non-conducting
insulating material such as plywood or heavy plastic.
Installing Batteries
There should be some type of barrier/racking between the
floor and the batteries. Battery rack(s) should be installed per
rack manufactures instructions. Battery rack should be secure-
ly anchored to the floor. Floor anchoring and its design are the
responsibility of the owner and should meet all local, state
and/or federal codes.
Caution should be observed when installing battery on
racking system. Consult battery layout to ensure batteries are
installed in the correct polarity order. Batteries are shipped
assembled, charged and filled with electrolyte to just below the
bottom of the vent well. f the electrolyte level is above the low
end of the vent well after the battery has been on a long open
circuit stand, care must be taken to avoid flooding during the
initial charge. Electrolyte may be removed to the bottom of the
vent well to prevent overflowing.
Battery terminals should be cleaned of all oils, greases or
corrosion prior to installing cables. The surface of the battery
terminals may be cleaned using a stiff-bristle nonmetallic
brush/pad until a clean bright surface is accomplished
Ensure all inter-battery connections and battery cables are
properly connected and polarity is correct. All inter-battery
cables should be of the same length and wire gauge. Cables
should be at minimum length to reduce voltage drop. Use a
voltmeter to confirm correct polarity. Lug bolt hole should be
5/16” in dia. Hardware supplied with battery should be used.
All battery connections should be torque to 150 in/lb.
All Parallel Connections should be of the same length and
wire gauge and be terminated at a common bus. This will
ensure all parallel battery strings are being discharged &
changed at the same voltage and current.
C arging Safety
There are several important safety precautions that should be
taken when charging a battery:
• Do not use open flames when checking the electrolyte
levels in storage batteries.
• Keep all open flames, sparks and matches away
from the charging area. DO OT SMOKE around the
charging area.
• Only properly trained personnel understanding all
safety measures, charging parameters and required
maintenance prior to charging should charge batteries.
• The charger should be OFF before connecting it to the
battery.
• All mechanical connections on the battery and charger
should be tight. Torque all connections to specifica-
tion. Loose connections can overheat and cause arcing
that could cause a gassing cell to explode, or cables
to become hot to the touch.
• Covers on battery trays should be kept open while
charging to promote cooling and allow gas to escape.
• Vent plugs should be kept firmly in place at all times
to minimize electrolyte spray when the battery gasses.
• The charger should be OFF before disconnecting the
battery.
Connecting/Disconnecting C arger
Always turn the charger OFF before connecting or discon-
necting a battery. Live leads can cause arcing and sparking,
which could cause an explosion if battery gases are present.
n addition, the contact surfaces of the plugs or connectors
will become pitted over time.
BattEry oPEration
There are several factors that affect the operation of the battery
concerning its ability to deliver capacity and life expectancy. Many
chemical reactions are affected by temperature, and this is true of
the reaction that occurs in a storage battery. The chemical reac-
tion of a lead-acid battery is slowed down by a lowering of the
electrolyte temperature that result in less capacity. A battery
that will deliver 100% of rated capacity at 77° F (25°C) will only
deliver 65% of rated capacity at 32°F (0°C).

5
Disc arge Voltage Curve
To estimate battery voltage during a constant current
discharge at various DoD (Depth of Discharge) consult
chart Discharge Voltage Curve in Appendix B.
OTE: Battery voltage can vary depending on temperature,
age and condition o battery.
To determine the correct system voltage, multiple the
number of cells connected in series by the above values.
The best way to determine if the battery needs an equalizing
charge is to check the specific gravity readings for each cell. f
there is more than 0.020 specific gravity unit variation between
any two cells, the battery should be equalized.
For installations in an uncontrolled temperature environment
it is highly recommended the Charge Controller / nverter be
used that has voltage temperature compensation. Charging
without voltage temperature compensation can result in both
under and overcharging of the battery system resulting in
reduced battery life and may be a determining factor with
warranty claims.
C arge Current
To properly determine the amount of charge current required,
the following variables are to be considered:
• DoD (Depth of Discharge)
• Temperature
• Size & efficiency of the charger
• Age & condition of battery(ies)
Maximum charge current should be limited to 20%
of the C20 Ah rate for the battery(ies) being used in
the system.
Example: M100-15 C20 rate – 830Ah
Max. recharge rate: 830Ah x 0.2 = 166A
Calculating Rec arge Time
The following can be used as a guideline for determining
recharge times:
85% to 90% SOC (State of Charge)
Time (hrs) = (Ahr x 1.2) / Ic
ote: Ic should be < 20% o C20
CHARGING PARAMETERS
Bulk Charge:
Current li ited to 20% of C20
or 4 ti es I20.
Absorption Charge:
2.40 vpc to 2.45 vpc
Float Charge:
2.30 vpc to 2.35 vpc
Equalize:
2.50 vpc to 2.55 vpc
Ahr = Amp Hours removed during discharge.
Ic = Maximum current available to
battery from charger.
C20 = C20 rate in Ah
East Penn Mfg recommends returning 120% of Ah removed
to insure 100% SOC (State of Charge).
Specific Gravity Readings
The following applies when using a manual hydrometer. To
take a specific gravity reading, remove the cell’s vent cap, place
the rubber hydrometer nozzle into the vent opening and draw
enough electrolyte into the barrel to permit the float to rise
freely. Hold the hydrometer at eye level as shown below.
The correct hydrometer reading corresponds to an imagi-
nary line drawn across the side of the barrel at the lowest
level of the electrolyte. f the hydrometer has to be removed
from the vent hole, pinch the nozzle tightly or place a gloved
finger against the opening to prevent dripping.
Specific gravity measurements are based on a cell tempera-
ture of 77°F (25°C). n order to obtain an accurate specific
gravity measurement, the hydrometer reading must be adjust-
ed based on the temperature of the electrolyte. A good rule of
thumb for temperature correction is to add 4 points of specific
gravity (.004) for each 10°F above 77°F and to subtract 4
points for each 10°F degrees under 77° F (25°C).
To take the temperature reading, insert a thermometer into
the electrolyte of the pilot cell. f the thermometer doesn’t have
specific gravity/temperature corrections marked on it, refer to
the above paragraph.
Battery specific gravity and open circuit voltage can be used
to determine the SOC (State of Charge) of a battery.
The below chart details OCV & Specific Gravity to SOC:
ote: True OCV o a battery can only be determined a ter
the battery has been removed rom the load (charge or
discharge) or 24 hours.
% SOC Specific Gravity OCV Voltage
100 1.250 2.10 or higher
75 1.210 2.06
50 1.150 2.03
25 1.120 2.00
0 1.100 1.97

6
Placing Battery into Service
Battery voltage, specific gravities of each individual cell as well
as temperature of pilot cell should be taken and recorded prior
to battery being placed on charge. See Battery Maintenance
Report Appendix A
Proper charging is essential for maximum battery life.
A temperature compensated voltage regulated charger is
recommended to be used in renewable energy applications.
When a discharged battery is initially placed on charge,
it draws a current equal or close to the charger’s maximum
output. As the battery’s voltage rises, the charger output
should adjust to the changing voltage to assure a safe,
efficient charging rate during all stages of the charge.
A freshening charge at the absorption charge rate should
be given to a new battery before putting it into service. The
battery should be cool; less than 90°F (32°C), when it’s
installed. The battery should remain in equalize until the
specific gravity shows no change for a three-hour period
with readings taken hourly or a max. of 12 hrs.
Proper maintenance is essential to obtain long life and
maximum efficiency from any renewable energy battery.
Carefully following a scheduled maintenance routine will
help increase battery performance and prolong service life.
Maintain an accurate records system of battery cycles and
maintenance/repair work for each battery. A records system
is particularly important for operations that use a large
number of batteries.
f you don’t already have one, these procedures should help
you create a reliable records system:
1. Assign a code/identification number to each battery / cell.
2. Designate a “pilot cell” for each battery. Record the specif-
ic gravity, voltage and temperature of the pilot cell when
the battery is first received and equalized, and before and
after each charge. The readings taken on the pilot cell are
considered to represent the specific gravity, voltage and
temperature of all the cells. Always use the same cell for
the pilot cell. The pilot cell should be positioned near the
center of the battery and can be identified with a marking
of some sort on the intercell connector shroud or cell
cover.
3. At least once each month, measure and compare the
specific gravity of all the cells. The readings should be
uniform from cell to cell. f the specific gravity readings
fall 20 points (0.20) below the nominal specific gravity
reading of 1.250, the electrolyte levels should be checked
and brought up to a uniform level before checking for a
second time. f, at any time, the readings are 20 points
(.020) greater than the nominal specific gravity readings
of 1.250, or the range of the on-charge cell voltage
readings is more than 0.15 volts, the battery could be
showing signs of cell failure. Contact your authorized
East Penn Mfg Representative.
4. Remember to accurately record the number of cycles,
specific gravity, temperature and voltage readings; and
all maintenance and repair information for every battery.
Maintenance Report Appendix A is an example of a basic
record-keeping form.
BattEry maintEnancE
Batteries should be inspected periodically to avoid damage
resulting from previously undetected problems or improper
maintenance and operational procedures.
Look for:
• Corrosion on the tray, terminals or intercell connectors.
•Leaks or damage to the tray.
• Damaged cable leads, terminals or connections.
• Damaged, clogged or missing vent caps.
Repair or replace any damaged parts and thoroughly clean
the battery. n case of serious damage or for major repairs,
contact nearest authorized East Penn representative.
Before taking any specific gravity or voltmeter readings,
the battery should be fully charged. Take specific gravity and
voltage readings for each cell and record the readings on
your battery inspection form. Use the battery’s positive
terminal cell as cell #1 and follow the intercell connectors to
the last cell (the battery’s negative terminal cell). Look for
any unusual readings that might indicate a problem cell.
Neutralizing Acid and Electrolyte
For cleaning batteries, non-corrosive, water based battery
cleaning products are all that should be used. For user safety
and environmental regulatory compliance, the cleaning liquid
should contain no hazardous chemical ingredients. Even
some products labeled “Battery Cleaner” must be avoided
because of hazardous ingredients and damage to batteries
and related equipment.
Acid spills are common in battery rooms. When acid spills
occur it is critical to minimize:
1. Health and safety risk to personnel and the environment.
2. Damage to batteries, equipment,
and surrounding surfaces.
3. Time to neutralize, absorb, and clean-up.
4. Disposal costs of waste materials.
5. Regulatory compliance risks and fines.
Neutralizing acid absorbers and spill kits have the per-
formance attributes required when dealing with acid spills.
The ph neutral dry and non-hazardous waste is easy to
sweep-up and dispose as non-hazardous waste.
Adding Water/Adjust Electrolyte Levels
Batteries normally lose a certain amount of water due to
evapo-ration and electrolysis during charging. The electrolyte
level should be maintained at a ¼” below the bottom of the
vent well opening of the cover. t is important not to allow the
electrolyte level in any cell to drop below the top of the moss
guard, since low levels can damage the plates and shorten life.
t is equally important to avoid overfilling the cells, as
electrolyte will be forced out of the vent caps during charg-
ing onto the top of the battery, causing tray corrosion and
reducing battery capacity.
Only distilled or de-ionized water should be used to water
cells because certain impurities and chemicals found in tap
water can be harmful to batteries. Warranty may be affected if
water other than distilled or de-ionized is used.

7
Distilled or de-ionized water should only be added to batter-
ies while the batteries are on charge and gassing or as soon
after recharge as possible. This will prevent overfilling because
the electrolyte is at its max¬imum level during this time. To
prevent low electrolyte levels, frequent checks should be made
and water should be added when necessary.
How a watering schedule is determined depends on the type
of battery, frequency of charge, temperature of the battery, and
age and condition of the battery. Excessive water loss may be
caused by shorted or weakened cells, excessive charging
rates, or the charger not shutting off automatically. Cells that
continually lose excessive amounts of water should be
checked for possible internal damage.
Performing a Test Disc arge
To determine if a battery can deliver its rated capacity, a test
discharge, or capacity test, can be performed. This test helps
determine the “health” of a battery and whether or not it
should be replaced.
Only experienced battery technicians should be allowed to
prepare a battery for discharge testing and to conduct the
actual discharge test.
The test is conducted by discharging a fully charged battery
at a specific rate until the battery voltage drops to a predeter-
mined volts per cell, times the number of cells in the battery.
By noting the time elapsed between when the battery was
put on discharge and when the final voltage was reached,
you can determine whether the battery is delivering its rated
capacity:
1. Give the battery an equalizing charge and adjust the
specific gravity to the manufacturer’s specification, with
the electrolyte level at the bottom of the vent well. Always
temperature correct the gravity readings.
2. Start the test and record the starting time.
3. Record individual cell voltages and overall battery voltages
during the first hour at 10 minutes, 30 minutes and then
60 minutes. After the first hour, take hourly readings until
the first cell voltage reaches 1.80 volts per cell. From this
point on, record the voltage of the cells every 5 minutes.
4. Carefully monitor the voltage of the low cells and as the
voltage of each cell drops below the predetermined final
voltage, record the time.
5. When the majority of the cells reach termination value,
stop the test. Don’t let any cells go into reversal.
For example, if the test was run at the 360 minute rate was
terminated after 336 minutes; the capacity percentage
would be 93%
6. After termination of the test, immediately record the specif-
ic gravity of each cell. f all the cells have uniform specific
gravity and the battery delivers 50% or more of its rated
capacity, it can be returned to service. f the test indicates
that less than 50% of the battery’s rated capacity is being
delivered, the battery should be either repaired or replaced,
depending upon its age and overall condition.
For more detailed information on capacity testing, contact
East Penn Manufacturing Company or your local authorized
East Penn Representative.

8
trouBlEsHooting
1 Malfunctioning Charger Equipment 1 Repair or replace charger equipment
2Charge Controller / nverter voltage 2Adjust voltage settings per battery
settings out of specification manufacturers recommendations
3 Defective or weak cell(s) 3 Replace problem cell(s)
4High resistance connection within 4Check for hot wires, cells, intercell
battery connections, charging cables. Repair
or replace defective component(s)
5 Low electrolyte level 5 Add water to moss cover when
battery is in discharged state
Battery Overheats During Charge
1Electolyte puddle on the floor 1 Replace cracked cell(s)
Cracked or broken jar(s)
2 Cell missed when watered 2 More careful attention when watering
3 Defective or weak cell(s) 3 Replace problem cell(s)
4 Frequent overcharge 4 See items 1 & 2 in
“battery overheats during charge”
5 Battery not regularly watered 5 Water battery regularly
Low electrolyte
1 Grounds in battery 1 Clean battery
2 Battery used beyond its useful life 2 Replace battery with equal or higher
capacity battery
3Weak, leaking or defective cell(s) 3 Replace problem cell(s)
in battery
Unequal Cell voltages
1 Battery not fully charged 1 Charge battery until electrolyte
specific gravities are within specification
2Weak, leaking or defective cell(s) 2 Replace problem cell(s)
in battery
3 Ground or shorts in battery 3 Remove grounds or shorts
4Battery used beyond its useful life 4Replace battery with equal or higher
capacity battery
5 PV Electrical system problem 5 Troubleshoot PV electrical system
Verify charge controller / nverter
charge settings are within
6 Battery undercharged for long period 6 recommendations. Recharge battery
of time and now sulfated until battery is at full state of charge.
Perform discharge test.
Battery not able to supply power as
when initially installed
1Temperature compensation not 1Verify temperature compensation is
present or not working installed and working correctly
Battery charge voltage readings
do not change during ambient
temperature variations
symPtoms PossiBlE causEs rEmEdy

9
Date Cell No. Voltage Electrolyte Specific
Temperature Gravity
aPPEndix a
Date Cell No. Voltage Electrolyte Specific
Temperature Gravity
Battery Maintenance Report
Site Location ______________________________________ Installation Date _____________________________________
ilot Cell # _________________________________________ Full Charge Gravity _____________________________________

10
Date Cell No. Voltage Electrolyte Specific
Temperature Gravity Date Cell No. Voltage Electrolyte Specific Temperature Gravity
Battery Maintenance Report
Site Location ______________________________________ Installation Date _____________________________________
ilot Cell # _________________________________________ Full Charge Gravity _____________________________________

11
aPPEndix B

glossary
12
Absorption (Regulation) Charge – The
charger will attempt to hold its output
voltage constant while the battery contin-
ues to absorb charge (draw charging
current) from the charger. The rate at
which the battery continues to absorb
charge in this mode gradually slows
down. The amplitude of the charger cur-
rent is gradually decreasing. The charge
current is falling and the battery voltage
is flat (constant).
Acid n the lead acid storage battery
industry, “acid” implies “sulfuric acid”.
Ambient Temperature The temperature
of the surrounding cooling medium, such
as gas or liquid, which comes into con-
tact with the heated parts of the appara-
tus, usually refers to room or air temp.
Ampacity Current carrying capacity in
amperes.
Ampere (Amp) The practical unit of
electric current that is equivalent to the
steady state current produced by one volt
applied across a resistance of one ohm.
t is one tenth of an ampere.
Ampere-Hour A measure of the volume
of electricity, being one ampere for one
hour, or 3600 coulombs. t is used to
express battery capacity, and is regis-
tered by an ampere hour meter, or is
obtained by multiplying the current in
amperes by the length of time that the
current is maintained.
Ampere-Hour Capacity The number of
ampere-hours which can be delivered
under specified conditions as to tempera-
ture, rate of discharge, and final voltage.
Battery (Storage) A storage battery is
a connected group of two or more stor-
age cells (common usage permits this
term to be applied to a single cell used
independently). Batteries are sometimes
referred to as “Accumulators” since
electric energy is accumulated by
chemical reaction.
Bulk Charge – Current is applied to the
batteries at the maximum safe rate they
will accept until voltage rises to near
(80-90%) full charge level.
Capacity See AMPERE HOUR CAPACITY
Capacity Test A test wherein the battery
is discharged at constant current at room
temperature to a cutoff voltage of usually
1.70 volts/cell.
Cell (Storage) A storage (secondary)
cell is an electrolytic cell for the genera-
tion of electric energy in which the cell
after being discharged may be restored
to a charged condition by an electric cur-
rent flowing in a direction opposite to the
flow of current when the cell discharges.
Charged The condition of a storage cell
when at its maximum ability to deliver
current. The positive plate contains a
maximum of lead peroxide and a mini-
mum of sulfate, while the negative plates
contain a maximum of sponge lead and a
minimum of sulfate, and the electrolyte
will be at maximum specific gravity.
Charging The process of converting
electrical energy to stored chemical
energy. n the lead-acid system, charging
converts Lead Sulfate (PbSO4) in the
plates to Lead Peroxide (PbO2) (positive)
or Lead (Pb) (negative plate).
Charging Rate The current expressed in
amperes at which the battery is charged.
Circuit A system of electrical compo-
nents through which an electric current
is intended to flow. The continuous path
of an electric current.
Constant-Current Charge A charge in
which the current is maintained at a
constant value. (For some types of lead-
acid batteries this may involve two rates
called a starting and a finishing rate.)
Constant Voltage Charge A charge in
which the voltage at the terminals of the
battery is held at a constant value.
Cut-Off Voltage See FINAL VOLTAGE
Cycle A discharge and its subsequent
recharge.
Cycle Service A type of battery opera-
tion in which a battery is continuously
subjected to successive cycles of
charge and discharge, e.g., motive
power service.
Deep Discharge Removal of up to 80%
of the rated capacity of a cell or battery.
Direct Current (DC) A direct current is a
unidirectional current in which the
changes in value are either zero or so
small that they may be neglected.
Discharge The conversion of the
chemical energy of the battery into
electrical energy.
Discharged The condition of a storage
cell when as the result of delivering
current, the plates are sulfated, the
electrolyte is exhausted, and there is
little or no potential difference between
the terminals.
Discharge Rate Batteries discharged to
meet any time rate between 3 hours and
8 hours are considered as having been
normally discharged.
Efficiency The ratio of the output of the
cell or battery to the input required to
restore the initial state of charge under
specified conditions of temperature,
current rate and final voltage.
Electrolyte Any substance which disas-
sociates into two or more ions when dis-
solved in water. Solution of electrolyte
conduct electricity and are decomposed
by it. n the battery industry the word
“electrolyte” implies a dilute solution of
sulfuric acid.
Equalizing Charge An extended charge
which is given to a storage battery to
insure the complete restoration of active
materials in all the plates of all the cells.
Final Voltage The cut-off voltage
of a battery; The prescribed voltage
reached when the discharge is consid-
ered complete.
Float Charging Application of a recharge
at a very low rate and accomplished by
connection to a buss whose voltage is
slightly higher than the open circuit
voltage of the battery.
Full Charge Gravity The specific gravity
of the electrolyte with the cells fully
charged and properly leveled.
Gassing The evolution of gases from
one or more of the electrodes during
electrolysis.
Gravity Refers to specific gravity.
Hydrometer Device used to indicate
density or specific gravity of electrolyte
solutions.
Lead (Pb) Chemical element used in
lead-acid batteries (with sulfuric acid
and other materials).
Lead Sulphate (PbS04)A compound
resulting from the chemical action of
sulfuric acid on oxides of lead or lead
metal itself.

glossary
13
Life Number of years of satisfactory float
operation or number of charge-discharge
cycles for motive power operation.
Loss of Charge The capacity loss occur-
ring in a cell or battery standing on open
circuit as a result of local action.
Lug Portion of grid used for support of
the plate group, usually along top edge
of grid, as “hanging lug.” Also, tab on
grid used for connection of plate to
strap and other plates.
Millivolt (MV) One thousandth part
of a volt.
Moss Dendritic crystals of lead (Pb)
which sometimes grow at high-current
density areas of negative plates, e.g.
along edges, at feet, or a plate lugs.
May cause a short circuit within cell.
Moss Shield Plastic or hard rubber
perforate sheet which insulates the
gaps between negative plates and the
positive strap, and between positive
plates and the negative strap.
egative Terminal The terminal toward
which current flows (as ordinarily con-
ceived) in the external circuit from the
positive terminal.
OHM A unit of electrical resistance.
Open Circuit The state of a battery when
it is not connected to either a charging
source or to a load circuit.
Open Circuit Voltage The voltage at its
terminals when no appreciable current
is flowing.
Pilot Cell A selected cell of a storage
battery whose temperature, voltage, and
specific gravity are assumed to indicate
the condition of the entire battery.
Plate A pasted grid, either formed or
unformed.
Polarity An electrical condition determin-
ing the direction in which current tends
to flow. By common usage the discharge
current is said to flow from the positive
electrode through the external circuit.
Positive Plates Consists of the grid and
the active material from which current
flows to the external circuit when the
battery is discharging.
Positive Terminal The terminal from
which current flows (as ordinarily
conceived) through the external circuit
to the negative terminal when the cell
discharges.
Post Terminal or other conductor which
connects the plate group strap to the
outside of the cell.
Rated Capacity The ampere hours of
discharge that can be removed from a
fully charged secondary cell or battery, at
a specific constant discharge rate at a
specified discharge temperature and at
specified cut off voltage.
Self Discharge Loss of charge due to
local action.
Short Circuit Current The current which
flows when the two terminals of a cell or
battery are inadvertently connected to
each other.
Standing Loss The loss of charge by an
idle cell or battery, resulting from local
action.
State of Charge (SOC) The amount of
electrochemical energy left in a cell or
battery.
Stratification As applied to electrolyte it
is layers of high gravity acid in the lower
portions of a cell, where they are out of
touch with the ordinary circulation of the
electrolyte and thus of no use.
Sulfated A term used to describe any
plate or cell whose active materials
contain an appreciable amount of lead
sulfate.
Sulfation The formation of lead sulfate
on a plate or cell as a result of discharge,
self-discharge, or pickling.
Sulfuric Acid (H2S04)The principal acid
compound of sulfur. Sulfuric acid of a
high purity and in dilute form is the
electrolyte of lead-acid storage cells.
Temperature Correction n storage
cells, the specific gravity and charging
voltage vary inversely with tempera-
ture, while the open circuit voltage
varies directly (though slightly) with
temperature.
Terminals The terminals of a battery are
the points at which the external circuit is
connected.
Tray Steel enclosure for motive power
battery cells.
Vent An opening provided to permit the
escape of gas from a cell or mold.
Vent Assembly A cell venting device
consisting of a ceramic vent stone and
filler funnel assembled on a threaded or a
quarter turn bayonet base.
Vent Cap See VENT PLUG.
Vent Plug The piece or assembly of
pieces employed to seal the vent and
filling well of a cell cover except for a
small hole in the plug itself which per-
mits the escape of gas. Vent plugs are
usually held in place either by threads
or by a quarter turn catch (bayonet vent
plug), or by a snap-in fit.
Vent Well The hole or holes in a cell
cover through which gas escapes, fluids
are added or the electrolyte level is
checked. The vent plug or vent assembly
fits into the vent well.
Volt The practical unit of measurement
of electro-motive force or potential differ-
ence required to send a current of one
ampere through a resistance of one ohm.
Voltage The difference of potential
which exists between the terminals of a
cell or battery, or any two points of an
electrical circuit.
Voltage Range The difference between
the maximum and minimum cell voltages
that exist within a battery or string of
cells when all of the cells are charging
or discharging.
Voltmeter An instrument for measuring
voltage.
Watering Adding water to battery
electrolyte to replace electrolysis and
evaporative losses.

Notes:
UL Recognized Component
E. .M. Form No. 1964 Rev. 1/14 © 2014 by E M rinted in U.S.A.
All data subject to
change without notice.
No part of this document may
be copied or reproduced,
electronically or mechanically,
without written permission
from the company.
Domestic Inquiries Call: 1-800-372-9253
www.mkbattery.com • e-mail: [e-mail]
East Penn Manu acturing Co., Lyon Station, PA 19536-0147
Domestic & International Inquiries Call: 610-682-3263
Phone: [phone] • Fax: [phone]
www.eastpennunigy.com • e-mail: [e-mail]