Narada 6V Series User manual

VALVE REGULATED SEALED LEAD ACID BATTERY
NARADA POWER SOURCE CO., LTD
Email: [email protected] Website: en.naradapower.com
OPERATION MANUAL
Version V1.0
6V & 12V Series

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Product Features
Main application
Working principle
Discharge performance
Charge performance
General
Inspection
Corrective actions
Annex1
Annex2
Parameter settings
Operation condition
Capacity and inuence factors
Lifetime and inuence factors
Storage
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6V&12V Serials
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04
Warning—do not smoke or use re near batteries.
Warning—do not use organic solvent to wash batteries.
Warning—dot not put batteries into the re, or it could be exploded.
Warning—do not dismantle batteries, it contains electrolyte, which can do harm to the skin
and eyes.
Warning—shock or short circuit could be caused when replacing the batteries. Please
operate with tools with insulated handles.
Please read this operation manual carefully. It offers very important safety instructions, installation
and operation guide, which will ensure the best performance of your equipment and prolong their
service life.
For the sake of your safety, please do not attempt to remove the components of the battery. The
maintenance of the battery can only be carried out by service engineers specially trained by the
Principal.
Considering the potential harm of the lead components to the health and environment, the
battery can be replaced only by the service center authorized by the manufacturer. To replace
the battery or maintenance equipment, please call the after-sales service hotline for information
of the nearest service center.
Please check the local regulations on the correct way of battery disposal or send the battery to
the authorized service center for replacement.
Battery replacement should be operated or supervised by engineers who are experienced and
aware of the preventive measures on the potential harm of the battery.
03
Please take care of the following marks in using
Warning Electricity
danger
Fire
forbidden Circle used
Protecting
your eyes
Watch
Short-circuits
With adults
custody
Do not put
batteries into
dustbin
The product has
passed the UL
authentication
Read the
manual
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| Product Features
| Main application
■ Telecom exchange and transmission system
■ Mobile communication system
■ Power plant and power transformer system
■ Navigation aid signaling system
■ Solar energy system
■ Radio and broadcasting station
■ Emergency lighting system
■ Other standby, cycling system
2×3 structure (front terminal)
Terminals
Terminals
Positive
plate
Positive
plate
Negative
plate
Negative plate
Lid
Lid
1×6 structure (front terminals)

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| Working principle
The chemical reaction-taking place in lead acid battery is as follows:
Following side reaction ① takes place in ordinary lead acid battery:
This side reaction makes water loss gradually and distilled water need to be added regularly to keep
the battery operate normally.
Thus there is a path existing between the positive and the negative for O2 recombination. Also
special alloy grid is chosen to increase over-potential of hydrogen evolution on the negative plate,
which minimize generation of Hydrogen. The reactions are as follows:
So it is possible to build EOS series battery in sealed structure.
Figure 2-2 is the battery charging characteristics curve of 6V & 12V series battery with constant
voltage and limited current (0.1C10A current, voltage limit 2.35V/cell), fully discharged battery charges
for 24 hours, and the charge power up to 105%. The dotted line is the 50% charge curve.
Pb+PbO2+2H2SO4 2PbSO4+2H2O
Discharge
Charge
2Pb +O2 2PbO
PbO+ H2SO4 PbSO4 +H2O
①
②
③
| Discharge performance
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Fig.2-1 the terminal voltage vs discharge time curves at different current at 25°C
Note:
■ Discharge current is larger, the actual discharge capacity is much less.
■ Discharge end voltage is varying with discharge current, voltage should not lower than specied value.
Terminal Voltage(V) Vs.Discharge Time (25°C,77°F)
| Charge Performance
Fig.2-2 the battery voltage vs charge time curves at 25°C

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The oating voltage calculation formula at different temperatures is:
VT=V25-(T-25)×0.003
VT—Floating voltage at T temperature;
V25—Floating voltage at 25°C;
The Equalization voltage calculation formula at different temperatures is:
VT=V25-(T-25)×0.005
VT—The charging voltage at T temperature;
V25—Average charge voltage at 25°C;
Floating voltage and temperature
The specic oating voltage is selected to operate the battery in its best condition. If the oating
voltage is too high, the oating charge current will increase, and the corrosion speed of the grid
will be accelerated, thereby reducing the service life of the battery. When the oating voltage is too
low, the battery cannot maintain a fully charged state, resulting in sulfation, capacity decrease, and
shorten the battery life.
At 25°C, the oat voltage of each series of Narada is shown in Table 2-1 below, and the temperature
compensation coefcient is -3mV/°C/cell.
Equalization charge voltage and temperature
VRLA batteries need to be charged on a regular basis in order to ensure normal operation of the
battery. At 25°C, the average charging voltage for each series of batteries is shown in Table 2-2.
Similarly, the average charging voltage needs to be adjusted with the ambient temperature, and the
temperature compensation coefcient of the battery charging voltage is -5 mV/°C/cell.
Table 2-1 Floating Voltage of Each Series (25°C)
Table 2-2 Equalization charging Voltage of Each Series (25°C)
Table 2-3 Temperature and voltage setting
MP/MPG
Acme/AcmeG
GP/GPG
ICS
UDS
DT
12REXC
HRL
HTB/HTB-F
MP/MPG
Acme/AcmeG
GP/GPG
HRL
HTB
HTB-F
ICS
UDS
DT
12REXC
≤10
15
20
25
30
35
40
≥45
2.30
2.28
2.27
2.25
2.24
2.22
2.21
-
2.32
2.30
2.29
2.25
2.26
2.24
2.23
2.21
2.43
2.40
2.38
2.35
2.33
2.30
2.28
-
2.38
2.35
2.33
2.30
2.28
2.25
-
-
2.25
2.25
2.25
2.25
2.25
2.25
2.25
2.25
2.27
2.35
2.35
2.35
2.35
2.35
2.35
2.35
2.35
2.35
2.30
Battery serials
Battery serials
Temperature(°C) MP, MPG, Acme, AcmeG,
GP, GPG, HRL, ICS, UDS,
DT, 12REXC
MP, MPG, Acme, AcmeG,
GP, GPG, HRL, HTB,
HTB-F, ICS, UDS, DT
12REXC
HTB, HTB-F,
Floating voltage(V/cell)
Floating voltage (V)
Equalization voltage (V)
Equalization voltage(V/cell)
Note:
(1) Please refer to the formula for each series, and calculate separately.
(2) The temperature compensation is not recommended for Narada 12V series batteries when oating voltage
is lower than 2.20V or higher than 2.30V/cell, and equalization voltage is lower than 2.28V/cell or higher than
2.43V/cell, please refer to followed table.

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Charge requirement
Charge requirement NoteCharge mode
More than two battery voltages in the battery
string are lower than 2.18V in oating operation Equalization charge
Equalization charge
Complement charge
Complement charge
Recommend charging if oat charge for
more than three months
Battery storage for more than 6 months
Before the battery is installed
and applied in the site.
After the battery discharged
Charge current:
Limited current I10~2.5I10
Charge voltage:
Limited voltage 2.35V/cell
Charge time:
24 hours
Note:
(1) When the depth of discharge is large (usually more than 5~10% C10), it is recommended to use the equalization voltage,
so that this charge mode is more adequate. When charges for 24 hours or the current drops below 0.005C10A, and the current
value is substantially constant for three consecutive hours, the charge is considered complete.
(2) The battery needs to be fully charged as soon as possible, the charge current can be increased appropriately, but it cannot
be higher than recommend value.
(3) If the battery is not recharged in time after discharge, or the power is off again during recharge, the insufcient-charged
batteries will be frequently discharge, thus the batteries will lose part of capacity in short period. And it may cause capacity
loss at initial stage and the batteries will be rejected if the situation is serious.
Battery recharge method
Step 1: Connect the batteries in series, and ensure that the bolts and screws are fastened.
Step 2: Connect the positive and negative poles of the battery to the positive and negative poles of the charging device.
Step 3: Turn on the charging power supply, set the charging current limit value and charging voltage value according to the
supplementary power requirements;
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| Parameter settings
Table 3-1 Switching power supply parameter setup table (48V system, 25°C)
54.0
54.4
54.0
54.4
Parameter name Tough power supply
(Cyclic operation)
Normal power supply
(Floating operation)
<5
-5
<5
-5
56.4 56.4
Please refer to table 3-2
55.2
0.1C10
0.25C10
90
24
>50
49
57.6
46
-3
35
45
35
45
50
57.6
47
-3
55.2
0.2C10
0.25C10
30
24
>50
Acme, AcmeG, MP, MPG, GP, GPG,
12REXC, ICS, UDS, DT
HRL, HTB,HTB-F
Acme, AcmeG, MP, MPG, GP, GPG,
12REXC, ICS, UDS, DT
HRL, HTB,HTB-F
12REXC
Charging Current(A)
Limited Current For Charge (A)
Equalization Charge Cycle(day)
Equalization Charge Time(h)
LLVD (V)
BLVD (V)
BLVD Recover Voltage(V)
High Voltage Warning(V)
Low Voltage Warning(V)
Condition to Change Float Charge To
Equalization Charge(mA/Ah)
Acme, AcmeG, MP, MPG, GP, GPG,
ICS, UDS, DT, HRL, HTB,HTB-F
Condition To Change Equalization
Charge To Float Charge(mA/Ah)
Temperature Compensate Ratio With
Floating Voltage(mV/°C per cell)
Temperature Compensate Ratio With
Equalization Voltage(mV/°C per cell)
Floating Voltage(V)
Equalization Voltage(V)
High Temperature Warning(°C)

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1. The voltage in above table is at 25°C.
2. Please contact the manufacture about standard for normal power supply or tough power supply.
3. Above are standard setup parameters in table 3-1. We suggest you to set up end voltage (BLVD)
based on different load current to make the battery life longer. Please refer to table 3-2.
Table 3-2 Voltage setup parameter of BLVD and LLVD
I<0.025C10
0.025C10≤I<0.05C10
0.05C10≤I<0.1C10
0.1C10≤I<0.2C10
0.2C10≤I<0.5C10
1.97
1.92
1.87
1.83
1.75
47.3
46.1
44.9
44
42
47.3
46.1
45.6
45.6
45.6
Load current(A) BLVD for 48V
system(V)
LLVD for 48V
system(V)
End voltage(V/cell)
| Operation Condition
Acme, AcmeG, MP, MPG, GP, GPG, HRL, 12REXC, ICS, UDS, DT serials
Ambient temperature: optimum temperature is 15°C~25°C, the higher and lower temperatures will
impact battery performance.
HTB, HTB-F Serials
Ambient temperature: Acme series optimum temperature is 15°C~35°C, the higher and lower
temperatures will impact battery performance.
Ambient humidity: ≤95%
Cabinet ventilation conditions: meet the standard EN 50272-2:2001
Table 3-3 Operation temperature range
Table3-4 Operation temperature range
Discharge
Charge
Storage
Discharge
Charge
Storage
-40°C~50°C
-20°C~50°C
-20°C~40°C
-40°C~65°C
-20°C~65°C
-20°C~45°C
15°C~25°C
15°C~25°C
15°C~25°C
15°C~35°C
15°C~35°C
15°C~35°C
Operation status
Operation status
Optimum temperature
Optimum temperature
Temperature range
Temperature range
| Capacity and influence factors
The capacity can be expressed in Rated Capacity or Actual Capacity. The Actual Capacity is the
product of discharge current (A) and discharge time (h). The usual unit of capacity is ampere-hour,
shortened as Ah.
The Inuence Factors of Actual Capacity
The actual capacity is mainly related with the battery’s construction, manufacturing process and
operation circumstance. During operation, the factors are discharge rate, end voltage and ambient
temperature.
Discharge Rate
If the discharge rate (hour rate) is smaller, the discharge current is larger, and the discharge duration
is shorter, then the capacity, which can be discharged, is less. For example, the discharge current
of 3 hours rate is larger than that of 10 hours rate; and the capacity of 3 hours rate is smaller than
that of 10 hours rate.
End Voltage
The end voltage is the lowest working voltage below which the battery cannot be discharged any
more. Usually the end voltage of 6V & 12V range battery is 10.8V per block. The capacity cannot be
discharged more even if the end voltage drops, because of the characteristics of lead acid battery.
The lower end voltage will harm the battery, especially when the voltage drops to 0V and the battery
cannot be recharged in time. It will shorten the life of the battery greatly.

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Table 3-5 discharge end voltage at different current
I<0.2C
0.2C≤I<0.5C
0.5C≤I<1.0C
I≥1.0C
1.80
1.80
1.70
1.60
Discharge Current(A) Discharge End Voltage(V/Cell)
Fig.3-1: Ambient Temperature VS Available Capacity
The capacity will decrease if the temperature is too low. The reason is that the negative plates is
passivated at lower temperature, then it causes the battery to be failed to recharge and the negative
active material sulfation.
The capacity will increase as the temperature increases. However, the higher temperature will
accelerate the corrosion of the grid and cause water loss inside the battery, thus shorten the life of
the battery.
Conductance, Resistance vs. Capacity
There is a certain corresponding relationship between conductance & resistance and battery
capacity. We suggest to test battery conductance and resistance data at difcult stage with same
type instruments from same factory. Conductance and resistance data is only a reference to judge
whether battery is good. These data cannot replace loading test to judge whether battery is good.
We recommend to test these data on the surface or side of battery post.
Ambient Temperature
VRLA batteries can be used in very low or high temperature. Yet all standard data (such as capacity,
life, oating voltage) are measured under standard temperature of 20°C-25°C. The capacity will
decrease under lower temperature as Fig. 3-1:
Battery life is the battery operation life, it is inuenced by many factors. The factors are charge mode,
discharge mode, ambient Temperature and so on.
| Lifetime and influence factors
Floating voltage
Equalization voltage
≤ 0.25C10 A
The Equalization
charge time is 24h
1.80V/cell per block at
10h rate.
15~25°C
(1) The charge voltage is too high, it will
accelerate corruption of the grid and shorten
life of the battery.
(2) The charge voltage is too low, the battery
will be insufcient.
If the current is too high, the battery
temperature will be higher, then it will cause
water loss, thermal runaway.
The charge time is only aimed at the
equalization charge procedure, it can ensure
the battery can be fully charged.
If the end voltage is too low, it will be difcult to
recharge the battery and decrease the charge
efciency, thus reduce the life of battery.
When temperature exceeds 25°C, the battery
life will decrease half per 10°C temperature
raise.
t25~35=tT×2 (T-25)/10
Notes: T the actual ambient temperature;
TT is designed life at T ambient temperature
T25 is designed life at 25°C ambient
temperature
Charge mode
Discharge
mode
Ambient
temperature
End voltage
/
Voltage
Current
Time
Normal Value NoteMain factorsMain failure
/
/
(1) Different brands of battery cannot be
installed in one bank;
(2) Different group no. of battery cannot be
installed in one bank or in the same parallels.
If the capacity is failed, the failed battery
should be replaced timely.
Mixed
operation
Replace the
failure battery
/
/

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The 6V & 12V batteries require ventilation, drying, and avoid direct sunlight. The batteries experience
self-discharge in open circuit state, the result is that open circuit voltage decreases, and the capacity
also decreases. The self-discharge rate is related with ambient temperature. The self-discharge
rate is smaller when the ambient temperature is lower, otherwise is larger. If the open circuit voltage
is lower than 2.10V/cell, or storage period reach 6 months shown in following table, the batteries
should be recharged to avoid damage caused by self-discharge.
| Storage
It’s suggested to record the storage time in the periodic maintenance record and record the time when
another necessary supplemental charge should be made. The quality certicates and packages of
6V & 12V series batteries record the latest charge time of the batteries, next charge time can be
calculated according to this charge time.
Above 30°C
Below 30°C
3 months
6 months
Storage temperature Max. Storage period
Proper maintenance will prolong the life of a battery and will aid in assuring that it is capable of
satisfying its design requirements. A good battery maintenance program will serve as a valuable aid
in determining the need for battery replacement. The users must consider their particular application
and reliability needs if maintenance procedures, other than those recommended in this document,
are used. Battery maintenance should be performed by personnel knowledgeable of batteries and
the safety precautions involved.
| General
| Inspection
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Monthly Maintenance
■ Keep the battery-room clean.
■ Measure and record the ambient temperature of the battery-room.
■ Check each battery’s cleanness; check damage and overheating trace of the terminal, container
and lid.
■ Measure and record the total voltage and oating current of the battery system.
Yearly Maintenance
■ Repeat quarterly maintenance and inspection.
■ Check whether connectors are loose or not every year.
■ Make a discharge test to check with exact load every year, discharging 30-40% of rated capacity.
Make an 80%DOD capacity test every year after three years’ operation.
Special inspections
If the battery has experienced an abnormal condition (such as a severe discharge, overcharge, or
extreme high ambient temperature), an inspection should be made to assure that the battery has not
been damaged. Include the requirements for the yearly inspection.
Quarterly Maintenance
■ Repeat monthly inspection.
■ Measure and record oating voltage of every on-line battery. If more than two cells’ voltage is
less than 2.18Vpc after temperature compensation, the batteries need to be equalization charged.

6V&12V Serials
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| Corrective actions
Immediate
a) If connection resistance readings are more than 20% above a ceiling value established by the
Narada, or if loose connections are noted, retorqu. If terminal corrosion is noted, clean the corrosion
and check the resistance of the connection. If retested resistance value remains unacceptable, the
connection should be disassembled, cleaned, reassembled, and retested.
b) If any electrolyte is found, determine source and institute corrective action. Clean excessive dirt
on cells or connectors when noted. Use extreme care when cleaning battery systems to prevent
ground faults.
c) When the oat voltage, measured at the battery terminals, is outside of its recommended operating
range, the charger voltage should be adjusted. The out-of-range condition may have been caused
by a defective charger and may need to be investigated.
Routine
The following items indicate conditions that, if allowed to persist for extended periods, can reduce
battery life. They do not necessarily indicate a loss of capacity. Therefore, the corrective action
may be accomplished before the next quarterly inspection, provided that the battery condition is
monitored at regular intervals:
a) If any cell/unit voltage is below its respective critical minimum voltage as specied by the
manufacturer, corrective action should be given. Do not charge at rates above the recommendation
for the specic ambient temperature involved.
b) When cell temperatures deviate more than 3 °C from each other during a single inspection,
determine the cause and correct. If sufcient correction cannot be made, contact the Narada for
allowances that must be taken.
c) Other abnormalities.
Annex 1
VRLA Battery Regular Maintenance Record
No.
1
2
3
4
5
6
7
8
9
10
11
12
Check by sight
Current (A)
Voltage(V)
Type
Status
Total Voltage(V)
Place
Number of battery
Temperature
Voltage(V)
Result:
Tester Date
No.
13
14
15
16
17
18
19
20
21
22
23
24

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Annex 2
| Maintenance stock tools
Following tools and equipments are necessary at least to maintenance and troubleshooting VRLA
batteries.
■ Digital multimeter
■ Wrenches insulated
■ Adjustable wrench insulated
■ Torque wrench
■ Rubber gloves
■ Full set of masks
■ Plastic apron
■ Portable eyedrops
■ Fire extinguishers (C grade)
The following equipment is optional according to the type of maintenance.
■ Resistance tester
■ Charger and discharger special for storage battery (portable)

6V&12V Serials

NARADA POWER SOURCE CO., LTD.
NARADA ASIA PACIFIC PTE. LTD.
NARADA EUROPE (UK) LIMITED
Building A, No.822 Wen'er West Road, Hangzhou, Zhejiang, China
Tel: [phone] Fax: [phone]
Website: en.naradapower.com E -mail: [email protected]
Block 9 Khaki Bukit Road 1 #02-10 Eunos Technolink, Singapore 415938
Tel: [phone] Fax: [phone]
Website: www.narada-ap.com Email: [email protected]
Spectrum House, Dunstable Road, Redbourn, St. Albans, Herts Al3 7PR
Tel: [phone] Fax: [phone]
E-mail: [email protected]
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