SUNGOLD POWER LFPV Series User manual

LFPV Series
Pure Sine Wave Inverter
For All Home & Office Appliances
User’s Manual
Version 1.0
Utility + Inverter + Charger + Transfer SW + AGS
All in One

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LFPV Series Inverter/Charger
Installation and Operation Manual

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Table of Contents
1. Important Safety Information ..............................................................................................................................................- 4 -
1.1 General Safety Precautions ....................................................................................................................................... - 4 -
1.2 Precautions When Working with Batteries ............................................................................................................... - 4 -
2. Introduction..........................................................................................................................................................................- 5 -
2.1 General Information.................................................................................................................................................. - 5 -
2.2 Application .................................................................................................................................................................- 6 -
2.3 The Mechanical Drawing of LFPV Series................................................................................................................ - 6 -
2.3.1 The Front Side Mechanical Drawing of LFPV 12KW Series ............................................................................... - 6 -
2.3.2 The Front Side Mechanical Drawing of LFPV 10KW&15-18KW Series ............................................................ - 7 -
2.3.3 The Rear Side Mechanical Drawing of LFPV 10-18KW Series ........................................................................... - 7 -
2.4 Features ......................................................................................................................................................................- 8 -
2.5 Electrical Performance .............................................................................................................................................. - 8 -
2.5.1 Inverter ....................................................................................................................................................................- 8 -
2.5.2 AC Charger.............................................................................................................................................................- 8 -
2.5.3 Transfer................................................................................................................................................................. - 11 -
2.5.4 Frequency adjust...................................................................................................................................................- 11 -
2.5.5 Automatic Voltage Regulation(Optional).............................................................................................................- 11 -
2.5.6 Power Saver Mode ............................................................................................................................................... - 12 -
2.5.7 Protections ............................................................................................................................................................ - 13 -
2.5.8 Remote control Module ........................................................................................................................................- 14 -
2.5.9 LED Indicators & LCD ........................................................................................................................................ - 15 -
2.5.10 Audible Alarm.................................................................................................................................................... - 16 -
2.5.11 FAN Operation....................................................................................................................................................- 16 -
2.5.12 DIP Switches...................................................................................................................................................... - 17 -
2.5.13 Other features..................................................................................................................................................... - 18 -
3 Installation .......................................................................................................................................................................... - 19 -
3.1 Location ...................................................................................................................................................................- 19 -
3.2 DC Wiring recommendation ................................................................................................................................... - 19 -
3.3 AC Wiring................................................................................................................................................................- 21 -
3.4 Install Flange........................................................................................................................................................... - 24 -
4 Battery Information............................................................................................................................................................ - 26 -
4.1 Battery Type.............................................................................................................................................................- 26 -
4.2 Battery Capacity Rating .......................................................................................................................................... - 26 -
4.2.1 Battery Discharge Rate.........................................................................................................................................- 26 -
4.2.2 Depth of Discharge...............................................................................................................................................- 27 -
4.2.3 Understanding Amp-Hour Requirements.............................................................................................................- 27 -
4.2.4 Battery Configurations ......................................................................................................................................... - 27 -
4.2.5 Wiring Batteries....................................................................................................................................................- 28 -
4.2.6 Batteries Maintenance .......................................................................................................................................... - 29 -
5 Troubleshooting Guide ....................................................................................................................................................... - 30 -
6 Warranty..............................................................................................................................................................................- 33 -
7 Ordering Information ..........................................................................................................................................................- 33 -
Appendix 1.............................................................................................................................................................................- 34 -
Appendix 2 Battery Temperature Compensation (BTS) .......................................................................................................- 35 -

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1. Important Safety Information
WARNING!
This manual contains important instructions for all LFPV Inverter/Charger models that shall be followed
during installation and maintenance of the inverter.
1.1 General Safety Precautions
1. Before installing and using the LFPV Inverter/Charger, read all instructions and cautionary markings on
the LFPV Inverter /Charger and all appropriate sections of this guide. Be sure to read all instructions and
cautionary markings for any equipment attached to this unit.
2. This unit is designed for indoor use only. Do not expose the LFPV Inverter/Charger to rain, snow, or
spray.
3. To reduce risk of fire hazard, do not cover or obstruct the ventilation openings. Do not install the LFPV
Inverter/Charger in a zero-clearance compartment. Overheating may result.
4. Use only attachments recommended or sold by the manufacturer. Doing otherwise may result in a risk of
fire, electric shock, or injury to persons.
5. To avoid a risk of fire and electric shock, make sure that existing wiring is in good condition and that wire
is not undersized. Do not operate the LFPV Inverter/Charger with damaged or substandard wiring.
6. Do not operate the LFPV Inverter/Charger if it has received a sharp blow, been dropped, or otherwise
damaged in any way. If the LFPV Inverter/Charger is damaged, see the Warranty section.
7. Do not disassemble the LFPV Inverter/Charger. It contains no user-serviceable parts. See Warranty for
instructions on obtaining service. Attempting to service the LFPV Inverter/Charger yourself may result in a
risk of electrical shock or fire. Internal capacitors remain charged after all power is disconnected.
8. The LFPV Inverter contains more than one live circuit (batteries and AC line). Power may be present at
more than one source. To reduce the risk of electrical shock, disconnect both AC and DC power from the
LFPV Inverter/Charger before attempting any maintenance or cleaning or working on any circuits connected
to the LFPV Inverter/Charger. Turning off controls will not reduce this risk.
9. Use insulated tools to reduce the chance of short-circuits when installing or working with the inverter, the
batteries, or PV array.
1.2 Precautions When Working with Batteries
1. Make sure the area around the battery is well ventilated.
2. Never smoke or allow a spark or flame near the engine or batteries.
3. Use caution to reduce the risk or dropping a metal tool on the battery. It could spark or short circuit the
battery or other electrical parts and could cause an explosion.
4. Remove all metal items, like rings, brace lets, and watches when working with lead-acid batteries.
Lead-acid batteries produce a short circuit current high enough to weld metal to skin, causing a severe burn.
5. Have someone within range of your voice or close enough to come to your aid when you work near a
lead-acid battery.
6. Have plenty of fresh water and soap near by in case battery acid contacts skin, clothing, or eyes.
7. Wear complete eye protection and clothing protection. Avoid touching your eyes while working near
batteries.
8. If battery acid contacts skin or clothing, wash immediately with soap and water. If acid enters your eye,
immediately flood it with running cold water for at least twenty minutes and get medical attention
immediately.

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9. If you need to remove a battery, always remove the grounded terminal from the battery first. Make sure all
accessories are off so you don’t cause a spark.
10. Always use identical types of batteries.
11. Never install old or untested batteries. Check each battery’s date code or label to ensure age and type.
12. Batteries are temperature sensitive. For optimum performance, they should be installed in a stable
temperature environment.
13. Always recycle old batteries. Contact your local recycling center for proper disposal information.
2. Introduction
2.1 General Information
Thank you for purchasing the LFPV Series Inverter/Charger.
LFPV Series Pure Sine Wave Inverter is a combination of an inverter, charger, and Auto-transfer switch into
one complete system . It is packed with unique features and it is one of the most advanced inverter/chargers
in the market today.
The inverter features an AC pass-through circuit, powering your home appliances from utility or generator
power while charging the battery. When utility power fails, the battery backup system keeps your appliances
powered until utility power is restored. Internal protection circuits prevent over-discharge of the batteries by
shutting down the inverter when a low battery condition occurs. When utility or generator power is restored,
the inverter transfers to the AC source and recharges the batteries.
Accessories allow the LFPV series to also serve as a central hub of a renewable energy system. Set the
LFPV Series inverter to battery priority mode, designates the inverter-preferred UPS configuration. In this
configuration, the load power in normally provided by the inverter. However, if the inverter output is
interrupted, an internal transfer switch automatically transfers the load from the inverter to commercial AC
power. The transfer time between inverter and line is short(6ms typical), and such transfers are normally not
detected by even highly sensitive loads. Upon restoration of inverter power, the inverter will transfer back to
inverter power.
On the line priority mode, when utility AC power cuts off(or falls out of acceptable range), the transfer relay
is de-energized and the load is automatically transferred to the Inverter output. Once the qualified AC utility
is restored, the relay is energized and the load is automatically reconnected to AC utility.
It features power factor corrected, sophisticated multi-stage charging and pure sine wave output with
unprecedentedly high surge capability to meet demanding power needs of inductive loads without
endangering the equipment.
LFPV Series Inverter is equipped with a powerful charger of up to 120Amp (depending on Model). The
overload capacity is 300% of continuous output for up to 20 seconds to reliably support tools and equipment
longer
Another important feature is that the inverter can be easily customized to Battery priority via a DIP switch,
this helps to extract maximum power from battery in renewable energy systems. Thus, the LFPV Series Pure
Sine Wave Inverter is suitable for Renewable energy system, Utility, RV, Marine and Emergency
appliances.
To get the most out of the power inverter, it must be installed, used and maintained properly. Please read the
instructions in this manual before installing and operating.

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2.2 Application
Power tools–circular saws, drills, grinders, sanders, buffers, weed and hedge trimmers, air compressors.
Office equipment – computers, printers, monitors, facsimile machines, scanners.
Household items – vacuum cleaners, fans, fluorescent and incandescent lights, shavers, sewing machines.
Kitchen appliances – coffee makers, blenders, ice markers, toasters.
Industrial equipment – metal halide lamp, high – pressure sodium lamp.
Home entertainment electronics – television, VCRs, video games, stereos, musical instruments, satellite
equipment.
2.3 The Mechanical Drawing of LFPV Series
2.3.1 The Front Side Mechanical Drawing of LFPV 12KW Series

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2.3.2 The Front Side Mechanical Drawing of LFPV 10KW&15-18KW Series
2.3.3 The Rear Side Mechanical Drawing of LFPV 10-18KW Series

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2.4 Features
Smart Remote Control (RJ11 or RJ45)
Battery Temperature Sensor (BTS)
Automatic Generator Start (AGS)
Designed For Harsh Environment Operation
DC Start & Automatic Self-Diagnostic Function
Compatible With Linear & Non-Linear Load
Easy to Install & Easy to Operate & Easy to Solve
Low DC Voltage Supports Home & Office Appliances
Powerful Charge Rate Up to 120Amp, Selectable From 0%-100%
High Efficiency Design & “Power Saving Mode” to Conserve Energy
Battery Priority Mode, Designates the Inverter-Preferred UPS Configuration
13 Vdc Battery Recover Point, Dedicated for Renewable Energy Systems
8 pre Set Battery Type Selector plus De-sulphation for Totally Flat Batteries
4-step Intelligent Battery Charging, PFC (Power Factor Correction) for Charger
8 ms Typical Transfer Time Between Utility & Battery, Guarantees Power Continuity
15s Delay Before Transfer when AC Recover, Protection for Load when Used with Generator
2.5 Electrical Performance
2.5.1 Inverter
Topology
The LFPV inverter/charger is built according to the following topology.
Inverter: Full Bridge Topology.
AC Charger: Isolate Boost Topology
Because of high efficiency IGBT and 16bit, 4.9MHz microprocessor and heavy transformers, it outputs
PURE SINE WAVE Waveform with an average THD of 8% (Max 10%) depending of load connected and
battery voltage.
The peak efficiency of LFPV series is 88%.
Overload Capacity
The LFPV series inverters have different overload capacities, making it ideal to handle demanding loads.
1 For 110%<Load<125%(±10%), no audible alarm in 14 minutes, beeps 0.5s every 1s in the 15th minute,
and Fault(Turn off) after the 15th minute.
2 For 125%<Load<150%(±10%), beeps 0.5s every 1s and Fault(Turn off) after the 1 minute.
3 For 300%≧Load>150%(±10%), beeps 0.5s every 1s and Fault(Turn off) after 20s.
2.5.2 AC Charger
LFPV Series is equipped with an active PFC (Power Factor Corrected) multistage battery charger. The PFC

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feature is used to control the amount of power used to charge the batteries in order to obtain a power factor
as close as possible to 1.
Unlike other inverters whose max charging current decreases according to the input AC voltage, LFPV
series charger is able to output max current as long as input AC voltage is in the range of 164-243VAC
(95-127VAC for 120V model), and AC freq is in the range of 48-54Hz(58-64Hz for 60Hz model).
The LFPV series inverter is with a strong charging current of 120Amp (for 4KW,12V), and the max charge
current can be adjusted from 0%-100% via a linear switch at the right of the battery type selector. This will
be helpful if you are using our powerful charger on a small capacity battery bank. Fortunately, the linear
switch can effectively reduce the max charging current to 20% of its peak.
Choosing “0” in the battery type selector will disable charging function.
There are mainly 3 stages:
Bulk Charging: This is the initial stage of charging. While Bulk Charging, the charger supplies the battery
with controlled constant current. The charger will remain in Bulk charge until the Absorption charge voltage
(determined by the Battery Type selection) is achieved.
Software timer will measure the time from A/C start until the battery charger reaches 0.3V below the boost
voltage, then take this time asT0 and T0×2 = T1.
Absorb Charging: This is the second charging stage and begins after the absorb voltage has been reached.
Absorb Charging provides the batteries with a constant voltage and reduces the DC charging current in order
to maintain the absorb voltage setting.
In this period, the inverter will start a T1 timer; the charger will keep the boost voltage in Boost CV mode
until the T1 timer has run out. Then drop the voltage down to the float voltage. The timer has a minimum
time of 1 hour and a maximum time of 12 hours.
Float Charging: The third charging stage occurs at the end of the Absorb Charging time. While Float
charging, the charge voltage is reduced to the float charge voltage (determined by the Battery Type
selection*). In this stage, the batteries are kept fully charged and ready if needed by the inverter.
If the A/C is reconnected or the battery voltage drops below 12Vdc/24Vdc/48Vdc, the charger will reset the
cycle above.
If the charge maintains the float state for 10 days, the charger will deliberately reset the cycle to protect the
battery.
Table 2.5.1 Battery Charging Processes

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Table 2.5.2 Battery Type Selector
Switch Setting
Description
Fast Mode / VDC
Float Mode / VDC
0
Charger Off
1
Gel USA
14.0
13.7
2
AGM 1
14.1
13.4
3
Lithium/AGM2
14.6
13.6
4
Lithium/Sealed Lead Acid
14.4
13.6
5
Gel EURO
14.4
13.8
6
Lithium
12.6
12.0
7
LiFePO4
14.0
13.8
8
De-sulphation
15.5 for 4hrs
9
Classic LFP
13.6
13.5
For 12Vdc Mode Series (*2 for 24Vdc Mode ; *4 for 48Vdc Mode)
De-sulphation
The de-sulphation cycle on switch position 8 is marked in red because this is a very dangerous setting if you
do not know what you are doing. Before ever attempting to use this cycle you must clearly understand what
it does and when and how you would use it.
What causes sulphation? This can occur with infrequent use of the batteries(nor), or if the batteries have
been left discharged so low that they will not accept a charge. This cycle is a very high voltage charge cycle
designed to try to break down the sulfated crust that is preventing the plates taking a charge and thus allow
the plates to clean up and so accept charge once again.
Charging depleted batteries
The LFPV series inverter allows start up and through power with depleted batteries.
For 12VDC model, after the battery voltage goes below 10V, if the switch is still (and always) kept in "ON"
position, the inverter is always connected with battery, and the battery voltage does not drop below 2V, the
inverter will be able to charge the battery once qualified AC inputs are present.
Before the battery voltage goes below 9VDC, the charging can be activated when the switch is turned to
“Off”, then to “ON”.
When the voltage goes below 9VDC, and you accidently turn the switch to OFF or disconnect the inverter
from battery, the inverter will not be able to charge the battery once again, because the CPU loses memory
during this process.
Tabel 2.5.3 AC Charging Current for LFPV model
The charging capacity will go to peak in around 3 seconds. This may cause a generator to drop frequency,
making inverter transfer to battery mode.
Model
Watt
Battery
Voltage
AC Charger Current
Max
10.000
24 Vdc
135 ± 5 Amp
12.000
48 Vdc
115 ± 5 Amp
15.000
48 Vdc
135 ± 5 Amp
18.000
48 Vdc
95 ± 5 Amp

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It is suggested to gradually put charging load on the generator by switching the charging switch from min to
max, together with the 15s switch delay, our inverter gives the generator enough time to spin up. This will
depend on the size of the generator and rate of charge.
2.5.3 Transfer
While in the Standby Mode, the AC input is continually monitored. Whenever AC power falls below the
VAC Trip voltage (154 VAC, default setting for 230VAC,90VAC for 120VAC), the inverter automatically
transfers back to the Inverter Mode with minimum interruption to your appliances - as long as the inverter is
turned on. The transfer from Standby mode to Inverter mode occurs in approximately 8 milliseconds. And it
is the same time from Inverter mode to Standby mode.
Though it is not designed as a computer UPS system, this transfer time is usually fast enough to keep your
equipment powered up.
There is a 15-second delay from the time the inverter senses that continuously qualified AC is present at the
input terminals to when the transfer is made. This delay is built in to provide time for a generator to spin-up
to a stable voltage and avoid relay chattering. The inverter will not transfer to generator until it has locked
onto the generator’s output. This delay is also designed to avoid frequent switching when input utility is
unstable.
2.5.4 Frequency adjust
The frequency of the inverter is arranged by the SW4. Refer to the Table 2.5.11.
The factory default configuration for 220/230/240VAC inverter is 50Hz, and 60Hz for 100/110/120VAC
inverter. While the output freq can be easily changed once a qualified freq is applied to the inverter.
2.5.5 Automatic Voltage Regulation(Optional)
The automatic voltage regulation function is for full series of LFPV Pure Sine Wave Inverter/ Charger
except split phase models including LFPV 10KW~18KW.
Instead of simply bypassing the input AC to power the loads, the LFPV series inverter stabilizes the input
AC voltage to a range of 230V/120V±10%.
Connected with batteries, the LFPV Series inverter will function as a UPS with max transfer time of 10 ms.
With all the unique features our inverter provides, it will bring you long-term trouble free operation beyond
your expectation.
Function Introduction
Table 2.5.5 Input Voltage Transfer Points

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LFPV Function (Optional)
LFPV Series
LV (NA/JPN)
HV (INTL)
Acceptable Input Voltage Range (Vac)
0-160
0-300
Nominal Input Voltages (Vac)
100
110
120
220
230
240
(A) Line low loss N/W (On battery)
75/65
84/72
92/78
168/143
176/150
183/156
(B) Line Low comeback N/W (On Boost)
80/70
89/77
97/83
178/153
186/160
193/166
(C) Line 2nd boost threshold (On Boost)
**
**
**
**
**
**
(D) Line 2nd boost comeback (On Normal)
**
**
**
**
**
**
(E) Line 1st boost threshold (On Boost)
90
99
108
198
207
216
(F) Line 1st boost comeback (On Normal)
93
103
112
205
215
225
(G) Line buck comeback (On Normal)
106
118
128
235
246
256
(H) Line buck threshold (On Buck)
110
121
132
242
253
264
(I) Line high comeback (On Buck)
115
127
139
253
266
278
(J) Line high loss (On Battery)
120
132
144
263
276
288
2.5.6 Power Saver Mode
There are 3 different working status for LFPV inverter: “Power Saver Auto” 、“Power Saver Off” and
“Power Off”.
When power switch is in “Unit Off” position, the inverter is powered off.
When power switch is turned to either of “Power Saver Auto” or “Power Saver Off”, the inverter is powered
on.Power saver function is designed to conserve battery power when AC power is not or rarely required by
the loads.
In this mode, the inverter pulses the AC output looking for an AC load (i.e., electrical appliance). Whenever
an AC load (greater than 25 watts) is turned on, the inverter recognizes the need for power and automatically

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starts inverting and output goes to full voltage. When there is no load (or less than 25 watts) detected, the
inverter automatically goes back into search mode to minimize energy consumption from the battery bank.
In “Power saver on” mode, the inverter will draw power mainly in sensing moments, thus the idle
consumption is significantly reduced.
Power saver on
`
Power saver off
Power saver on (Load detected)
Note: The minimum power of load to take inverter out of sleep mode (Power Saver On) is 25 Watts.
Table 2.5.6 LFPV Series Idle Power Consumption
Model
Power Saver Off
Power Saver Auto
Idle(Max)
3Secs(Max)
Stand-By Mode
10.0KW
130W
25.0W
7.5W
12.0KW
180W
40.0W
15.0KW
225W
45.0W
18.0KW
270W
50.0W
When in the search sense mode, the green power LED will blink and the inverter will make a ticking sound.
At full output voltage, the green power LED will light steadily and the inverter will make a steady humming
sound. When the inverter is used as an “Un-interruptible power supply” the search sense mode or “Power
Saver On” function should be defeated.
Exceptions
Some devices when scanned by the load sensor cannot be detected. Small fluorescent lights are the most
common example. (Try altering the plug polarity by turning the plug over.) Some computers and
sophisticated electronics have power supplies that do not present a load until line voltage is available. When
this occurs, each unit waits for the other to begin. To drive these loads either a small companion load must
be used to bring the inverter out of its search mode, or the inverter may be programmed to remain at full
output voltage.
2.5.7 Protections
The LFPV series inverter is equipped with extensive protections against various harsh situations/faults.
These protections include:
AC Input over voltage protection/AC Input low voltage protection
Low battery alarm/High battery alarm
Over temperature protection/Over load protection
Short Circuit protection (1sec after fault)
Back feeding protection
When Over temperature /Over load occur, after the fault is cleared, the master switch has to be reset to
restart the inverter.

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The Low battery voltage trip point can be customized from defaulted value 10VDC to 10.5VDC by adjust
SW1 on DIP switch and the battery type selector.
Battery
Type
Selector
①
③
④
⑥
⑦
⑨
Alarm
Shut
Off
Alarm
Shut
Off
Alarm
Shut
Off
Alarm
Shut
Off
Alarm
Shut
Off
Alarm
Shut
Off
SW1.(1)
11.0V
10.5V
11.5V
11.0V
12.0V
11.5V
10.0V
9.5V
11.5V
11.0V
12.5V
12.0V
SW1.(0)
10.5V
10.0V
11.0V
10.5V
11.5V
11.0V
9.5V
9.0V
11.0V
10.5V
12.0V
11.5V
Other Number is same as Number 1
The inverter will go to Over temp protection when heat sink temp. ≥105ºC, and go to Fault (shutdown
Output) after 30 seconds. The switch has to be reset to activate the inverter.
The LFPV series Inverter has back feeding protection which avoids presenting an AC voltage on the AC
input terminal in Invert mode.
After the reason for fault is cleared, the inverter has to be reset to start working.
2.5.8 Remote control Module
Apart from the switch panel on the front of the inverter, an extra switch panel connected to the RJ11 port at
the DC side of the inverter thru a standard telephone cable can also control the operation of the inverter.
If an extra switch panel is connected to the inverter via “remote control port”, together with the panel on the
inverter case, the two panels will be connected and operated in parallel.
Whichever first switches from “Off” to “Power saver off” or “Power saver on”, it will power the inverter on.
If the commands from the two panels conflict, the inverter will accept command according to the following
priority:
Power saver on> Power saver off> Power off
Only when both panels are turned to “Unit Off” position will the inverter be powered off.
The Max length of the cable is 10 meters.
WARNING
Never cut the telephone cable when the cable is attached to inverter and battery is connected to the inverter.
Even if the inverter is turned off. It will damage the remote PCB inside if the cable is short circuited during
cutting.

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2.5.9 LED Indicators & LCD
Table 2.5.9 LFPV Series LED Indicators
Table 2.5.9 LFPV Series LCD Indicators
LINE MODE
GREEN LED lit in AC Mode
Please refer to ‘Indicator and Buzzer’
for the detailed information.
INVERTER MODE
GREEN LED lit in Inverter Mode
FAST CHARGE
YELLOW LED lit in Fast Charging Mode
FLOAT CHARGE
GREEN LED lit in Float Charging Mode
ALARM MODE
RED LED lit in Error State
OVER TEMP TRIP
RED LED lit in Over Temperature
OVER LOAD TRIP
RED LED lit in Over Load
POWER SAVER ON
GREEN LED lit in Power Saver Mode
1 Inverter Mode
2 Online Mode

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2.5.10 Audible Alarm
Table 2.5.10 LFPV Series Audible Alarm Spec
Battery Voltage Low
Inverter green LED lit, and the buzzer beeps 0.5s every 5s.
Battery Voltage High
Inverter green LED lit, and the buzzer beeps 0.5s every 1s and Fault after 60s.
Invert Mode Over-Load
(1)110%<load<125%(±10%), No audible alarm in 14 minutes,
Beeps 0.5s every 1s in 15th minute and Fault after 15 minutes;
(2)125% <load<150%(±10%), Beeps 0.5s every 1s and Fault after 60s;
(3)Load>150%(±10%), Beeps 0.5s every 1s and Fault after 20s;
Over Temperature
Heat-sink temp. ≥105ºC, Over temp red LED Lighting, beeps 0.5s every 1s;
2.5.11 FAN Operation
For 12-18KW, there are two multiple controlled DC fans and one AC fan. The DC fans are multiple
controlled DC fans , while the AC fan will work once there is AC output from the inverter.
So when the inverter is in power saver mode, the AC fan will work from time to time in response to the
pulse sent by the inverter in power saver mode.
The Operation of the DC fan at the DC terminal side is controlled by the following logic
(Refer to Table 2.5.10):
Table 2.5.11 LFPV Series Fan Operation Logic
Allow at least 30cm of clearance around the inverter for air flow. Make sure that the air can circulate freely
around the unit.
Variable speed fan operation is required in inverter and charge mode. This is to be implemented in such a
way as to ensure high reliability and safe unit and component operating temperatures in an operating
ambient temperature up to 50°C.
Speed to be controlled in a smooth manner as a function of internal temperature and/or current.
Fan should not start/stop suddenly.
Fan should run at minimum speed needed to cool unit.
Fan noise level target <60db at a distance of 1m.
Condition
Enter condition
Leave condition
Speed
HEAT SINK
TEMPERATURE
T ≤ 60℃
T > 65℃
Off
65℃≤ T <85 ℃
T ≤ 60℃ / T ≥ 85℃
50%
T > 85℃
T ≤ 80℃
100%
CHARGER
CURRENT
I ≤ 15%
I ≥ 20%
Off
20%< I ≤ 50%
I ≤ 15% / I ≥ 50%
50%
I > 50%
I ≤ 40%
100%
LOAD%
(INV MODE)
Load < 30%
Load ≥ 30%
Off
30% ≤ Load < 50%
Load ≤ 20% / Load ≥ 50%
50%
Load ≥ 50%
Load ≤ 40%
100%

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2.5.12 DIP Switches
On the front panel of inverter, there are 5 DIP switches which enable users to customize the performance of
the device.
Table 2.5.12 LFPV Series Dip Switch Function Setting
DIP Switch
NO.
Switch Function
Position: 0
Position: 1
SW1
Low Battery Trip Volt
10.0Vdc
For Deep-Cycle Battery
10.5Vdc
For Starting Battery
*2 for 24Vdc, *4 for 48Vdc
SW2
AC Input Range /
(AVR)
AC Source
For Utility Mode
For Generator Mode
230Vac HV
184-253Vac /
(176-276Vac)
140-270Vac / (150-276Vac)
120Vac LV
100-135Vac /
(92-144Vac)
90-135Vac / (78-144Vac)
SW3
Power Saver Auto Setting
Night Charger Function
Detect Load Per 3Secs
SW4
O/P Frequency Setting
50Hz
60Hz
SW5
Solar/AC Priority Setting
Utility Priority
Battery Priority
SW1: Low Battery Trip Volt:
For 12VDC model, the Low Battery Trip Volt is set at 10.0Vdc by typical deep cycle lead acid battery. It
can be customized to 10.5Vdc using SW1 for sealed car battery, this is to prevent batteries from
over-discharging while there is only a small load applied on the inverter.(*2 for 24VDC, *4 for 48VDC)
SW2: AC Input Range:
There are different acceptable AC input ranges for different kinds of loads.
For some relatively sensitive electronic devices, a narrow input range of 184-253VAC (100-135V for
120VAC model) is required to protect them.
While for some resistive loads which work in a wide voltage range, the input AC range can be customized to
140-270VAC (90-135V for 120VAC model), this helps to power loads with the most AC input power
without frequent switches to the battery bank.
In order to make the inverter accept dirty power from a generator, when the SW2 is switched to position
“1” , the inverter will bypass an AC input with a wide voltage and frequency(40Hz-70Hz for 50Hz/60Hz).
Accordingly, the AC charger will also work in a wide voltage and frequency range (43Hz-67Hz for
50Hz/60Hz). This will avoid frequent switches between battery and generator. But some sensitive loads will
suffer from the low quality power.
The pros and cons should be clearly realized.
SW3: Power Saver Auto Setting :
In Power Saver Mode, when the SW3 is switched to position“0”, inverter will work in Unit Off Charging
mode, it will stay in standby mode without sensing loads. It won’t output any power even if a load is turned
on. The inverter will not perform any function and only stay idle in this mode. When a qualified AC input
present, it will switch to AC input power to charge the battery and supply the load at the same time.

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When the SW3 is switched to position“1”, the inverter is initially in standby mode and sends a pulse to
detect the presence of a load every 3 seconds. Each pulse lasts for 250ms. The inverter will remain in
standby mode until a load has been detected. Then it will wake up from standby mode and start to inverter
electricity from the battery bank to supply the load.
SW4: Frequency Switch:
The output frequency of the inverter can be set at either 50Hz or 60Hz by SW4.
SW5: Battery Mode/AC Mode Priority:
Our inverter is designed with AC priority by default. This means, when AC input is present, the battery will
be charged first, and the inverter will transfer the input AC to power the load. Only when the AC input is
stable for a continuous period of 15 days, the inverter will start a battery inverting cycle to protect the
battery. After 1 normal charging cycle ac through put will be restored.
The AC Priority and Battery Priority switch is SW5. When you choose battery priority, the inverter will
inverting from battery despite the AC input. Only when the battery voltage is reaches low voltage alarm
point(10.5V for 12V), the inverter transfers to AC Input, charge battery, and switch back to battery when
battery is charged full. This function is mainly for wind/solar systems taking utility power as back up.
2.5.13 Other features
Battery voltage recovery start
After low battery voltage shut off (10V for 12V model/20V for 24V model/40V for 48V model), the inverter
is able to restore operation after the battery voltage recovers to 13Vdc/26Vdc/52Vdc (with power switch still
in the “On” position). This function helps to save the users extra labor to reactivate the inverter when the
low battery voltage returns to an acceptable range in the renewable energy systems. The built in battery
charger will automatically reactivate as soon as city/generator ac has been stable for 15 seconds.
WARNING
Never leave the loads unattended, some loads (like a Heater) may cause accident in such cases.
It is better to shut everything down after low voltage trip than to leave your load on, due to the risk of fire.
Auto Generator Start (AGS)
The inverter can be customized to start up a generator when battery voltage goes low.
When the inverter goes to low battery alarm, it can send a signal to start a generator, and turn the generator
off after battery charging is finished.
The auto generator start feature will only work with generators designed to work with this feature. There is
an open/closed relay that will short circuit the positive and negative cable from a generator. The input DC
voltage can vary, but the Max current the relay can carry is 16Amp.
Battery temperature sensor (BTS)
A battery temperature sensor (BTS) option can easily be installed in the system to ensure proper charging of
the batteries based on temperature. Installing a BTS extends battery life by preventing overcharging in warm
temperatures and undercharging in cold temperatures.
To install the Battery Temperature Sensor:
1. Run the battery temperature sensor wire in the DC conduit (if used) and route the RJ11 connector end to
the BATTERY SENSE port located on the front of the inverter.
2. Secure the sensor to one of the batteries located in the center of the battery pack.

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Conformal Coating
Entire line of LFPV inverters have been processed with a conformal coating on the PCB making it water,
rust, and dust resistant.
3 Installation
3.1 Location
Follow all the local regulations to install the inverter.
Please install the equipment in a location that is Dry, Clean, Cool and that has good ventilation.
Working temperature: ‐10℃‐40℃
Storage temperature: ‐40‐70℃
Relative Humidity: 0%‐95%，non-condensing
Cooling: Forced air
3.2 DC Wiring recommendation
It is suggested the battery bank be kept as close as possible to the inverter. The following able is a suggested
wiring option for 1m DC cable.
Please find the following minimum wire size. In case of DC cable longer than 1m, please increase the cross
section of cable to reduce the loss.
Please note that if there is a problem obtaining for example 100mm²cable, use 2*50mm²or 3*35mm².
One cable is always best , but cable is simply copper and all you require is the copper, so it does not matter
if it is one cable or 10 cables as long as the square area adds up. Performance of any product can be
Model
Watt
Battery
Voltage
Wire Gage /Min
0~1.0m
1.0~5.0m
10.000
24 Vdc
1/0 AWG*3
2/0 AWG*3
12.000
48 Vdc
1 AWG*3
2/0 AWG*2
15.000
48 Vdc
2/0 AWG*2
1/0 AWG*3
18.000
48 Vdc
1/0 AWG*3
2/0 AWG*3

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improved by thicker cable and shorter runs, so if in doubt round up and keep the length as short as possible.
Battery cables must have crimped (or preferably, soldered and crimped) copper compression lugs unless
aluminum mechanical lugs are used. Soldered connections alone are not acceptable. High quality, UL-listed
battery cables are available .These cables are color-coded with pressure crimped, sealed ring terminals.
Figure 3.2.1 Battery Cable Connections
CAUTION: Equipment Damage
The inverter is not reverse polarity protected. Reversing the battery polarity on the DC input connections
will cause permanent damage to the inverter which is not covered under warranty. Always check polarity
before making connections to the inverter.
WARNING: Shock Hazard
Ensure the inverter is off before disconnecting the battery cables, and that AC power is disconnected from
the inverter input.
Battery terminal must be clean to reduce the resistance between the DC terminal and cable connection. A
buildup of dirt or oxidation may eventually lead to the cable terminal overheating during periods of high
current draw. Use a stiff wire brush and remove all dirt and corrosion from the battery terminals and cables.