Support For Installers

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LIVOLTEK places a high value on relationships with our partners around the world. If you encounter any problems during the distribution or installation of our products, please feel free to contact us and we will arrange for our local technical teams to assist you as soon as possible.

Here you can find some useful tips before installing our products, as well as the most common problems you may encounter during troubleshooting.

Tips

What is needed to pay attention to for the first installation?

After the battery is installed for the first time, you are advised to charge the battery forcibly (for calibration Battery).

How to ensure the waterproofness of the machine?

1）Tighten the cable gland

2）Idle interfaces are sealed

3）The cable entry cover is closed

4）Conduit sealing treatment

5）Confirm and lock the waterproof cap

How to choose EPS mode?

There are 4 types of EPS modes, they are:
0 – Disable
1 – EPS without bypass：only in the case of power failure, EPS port will have voltage output (basically no standby power consumption)
2 – EPS with bypass：When there is power grid, EPS port will also have voltage output, and when power failure, EPS port voltage will need about 2s for output switch (low power standby power consumption).
3 – UPS with bypass：EPS port also has voltage output when there is power grid, and UPS mode output when power failure, EPS port voltage needs ＜20ms time for switching (high power standby power consumption)

How to prevent incorrect or misconnected DC cables from being crimped?

1) Do a good job of line marking to reduce the probability of
errors
2) Before connecting to the inverter, use a multimeter to measure the input voltage of the component on the positive and negative sides to ensure that the polarity is correct and does not exceed the maximum input voltage
3) Use special crimping tools for photovoltaic terminals
4) If conditions permit, you can use an infrared thermal imager or a spot temperature gun to confirm the connection point temperature after grid-connected power generation.

What are the requirements for machine installation?

Vertical installation/ Do not allow lying down/ Leaning back and inversion

FAQ

How to Ensure AC Cables and Terminals Are Not Reliably Connected?

1）Make sure to use terminal blocks for lock wire
2）Make sure the terminals are locked
3）Do not lock the screw to the cable insulation

What kind of installation mode does the inverter have?

Wall Mount and Bracket Mount

What are the requirements for machine installation?

Vertical installation/ Do not allow lying down/ Leaning back and inversion

What are the requirements for DC wiring?

1） When connecting photovoltaic modules to the inverter, the Amphenol H4 photovoltaic special connector provided with the inverter should be used. Compatible models may not guarantee long-term effective contact of metal terminals.
2） When crimping the positive metal terminal, do not also crimp the limit stop bar, otherwise the metal terminal will not be stuck, resulting in “heading”
3）Strictly prevent the reverse polarity of the DC input. It is forbidden to connect the single group in series in the same MPPT. Make sure that the terminal is correct before inserting the terminal into the inverter (it is recommended to use a multimeter to measure)

What are the specific requirements for AC wiring?

1）Pay attention to the correct connection of the neutral wire polarity
2）It is forbidden to connect the load to the output terminal of the inverter without passing through the circuit breaker;
3）Each inverter needs to be equipped with an independent circuit breaker to ensure safe disconnection from the grid
4）When using multiple single-strand cables for AC output, use fireproof mud to seal the gap between the sealing ring and the cable after wiring is completed.
5）When a large number of single-phase output inverters are connected to the same low-voltage transformer in the three-phase power grid, attention should be paid to the reasonable distribution of the inverters among the three phases, and the load balance of the three phases should be maintained as much as possible to avoid the failure of a certain phase due to insufficient consumption. The phase voltage rises and damages the electrical equipment;

Troubleshooting

1. On-grid Inverter

Product Name	Alarm Definition	Processing Strategies
A00-Grid AC over voltage	The grid voltage exceeds the allowable range	1. If the alarm occurs occasionally, it means the grid abnormal, the inverter can automatically recover to normal operating status after the grid return normal. 2. If the alarm occurs repeatedly and it can automatically recover, need to contact local electric power department to get permission to modify the inverter grid protection parameters with APP. 3. If the alarm occurs repeatedly for a long time, please confirm 1) If the output breaker is closed? 2)If the output terminal is ok? 3)If grid is power off? 4)If the output cable follow the User Manual guidance?
A01-Grid AC under voltage	The grid voltage exceeds the allowable range
A02-Grid AC absent	The grid voltage is 0 volt
A03-Grid AC over frequency	The grid frequency exceeds the allowable range
A04-Grid AC under frequency	The grid frequency exceeds the allowable range
B00-PV DC over voltage	PV module input voltage is higher than the allowable range	Please measure the PV input voltage with multimeter, and compare it with the “Max input voltage” written the inverter lable. If PV input voltage is larger than “Max input voltage”, then reduce the PV module quantity.
B01-PV insulation abnormal	The insulation resistance against the ground is lower than the allowable range	1. If the alarm occurs occasionally, it may be caused by external circuit, the inverter can automatically recover to normal operating status after the fault is cleared. 2. If the alarm occurs repeatedly or lasts a long time, please follow below steps: 1) Check if the output cable is stable. 2) Plug the PV strings one by one to find the abnormal PV strings. Please check if the insulation resistance against the ground of PV strings is too low, or the cable is broken, or cable connection incorrectly.
B02-Leakage current abnormal	The residual current is high.	1. If the alarm occurs occasionally, it may be caused by external circuit, the inverter can automatically recover to normal operating status after the fault is cleared. 2. If the alarm occurs repeatedly or lasts a long time, please follow below steps: 1) Check if the output cable is stable. 2) Plug the PV strings one by one to find the abnormal PV strings. Please check if the insulation resistance against the ground of PV strings is too low, or the cable is broken, or cable connection incorrectly.
B03-PV string abnormal	PV strings have been shielded for a long time or PV strings is abnormal	1. Check whether the PV string is shielded. 2. If the PV string is clean and not shielded, check if the PV modules are aging or deteriorated, or if cable/terminal is abnormal.
B04-PV DC under voltage	PV modules input voltage is under default protection value.	1. If alarm occur during sunlight weak(At morning or dawn, raining or ), it’s normal and no action is needed. 2. If not, please check if there is PV module connection short circuit.
A06-Grid voltage unbalanced	The grid voltage unbalanced exceeds the allowable range	1. If the alarm occurs occasionally, it means the grid abnormal, the inverter can automatically recover to normal operating status after the grid return normal. 2. If the alarm occurs repeatedly and it can automatically recover, need to contact local electric power department to get permission to modify the inverter grid protection parameters with APP. 3. If the alarm occurs repeatedly for a long time, please confirm 1) If the output breaker is closed? 2)If the output terminal is ok? 3)If grid is power off? 4)If the output cable follow the User Manual guidance?
C02-Output DC over current	Grid DC component current is higher than than the allowable range	1. If the alarm occurs occasionally, it’s caused by grid voltage abnormal temporarily, the inverter can automatically recover to normal operating status, no action is needed. 2. If the alarm occurs repeatedly or lasts a long time, please contact customer service center.
C03-Inverter relay abnormal	Internal relay abnormal	1. If the alarm occurs occasionally, it’s caused by grid voltage abnormal temporarily, the inverter can automatically recover to normal operating status, no action is needed. 2. If the alarm occurs repeatedly or lasts a long time, please check if output neutral line and fire line reverse connection. If not, please contact customer service center.
C05-Inverter over temperature	Internal temperature is higher than than the allowable range	1. If the alarm occurs occasionally, the inverter can automatically recover to normal operating status, no action is needed. 2. If the alarm occurs repeatedly or lasts a long time, please check if the installation site is direct sunlight, ventilation is good, the ambient temperature is too high. If not, please contact cusomer service center.
C06-Leakage current HCT abnormal	Residual current device test is failure	1. If the alarm occurs occasionally, it may be caused by external circuit abnormal, the inverter can automatically recover to normal operating status after fault is cleared. 2. If the alarm occurs repeatedly or lasts a long time, please check if the insulation resistance against the ground of PV strings is too low, or the cable is broken, or cable connection incorrectly.
B07-PV string reverse	The polar of PV strings is reversed.	Check whether the cables of PV strings are correctly connected. If they are connected reversely, reconnect the cables.
C08-Fan lock	Fan abnormal	1. If the alarm occurs occasionally, please restart inverter. 2. If the alarm occurs repeatedly or lasts a long time, please check if fan is blocked. If not, please contact customer service center.

Energy Storage System

1.Common Customer Complaints-Installation Stage

Earth fault: F2: 00000001

S/N	Probable Cause	Recommended Measure
1	The inverter ground wire is not connected properly	1.Check the inverter ground wire connection. 2.Check the voltage between N&E, it should be under 30V; If it is over 30V,check the connection of the home ground wire
2	The voltage between N&E is too high
3	Inverter damaged	Replace inverter

Meter Communication Failure: F3: 00000400

S/N	Probable Cause	Recommended Measure
1	The meter cable is not connected or the connected communication port is wrong	Check the meter connection wire harness and ports
2	Communication matching resistance is incorrect	Add matching resistance to the communication terminal of the meter
3	Inverter meter type setting is incorrect	Check the meter type parameter settings
4	The line sequence of the RJ45 head is incorrect or the line sequence of the communication port of the meter is incorrect.	Check the color and line sequence of the meter communication line according to the user manual
5	Bad meter communication harness	Replace the communication harness, UTP is recommended
6	Meter damaged	Replace meter
7	The meter communication port of the inverter is damaged	Replace meter

BMS communication failure: F3: 00004000

S/N	Probable Cause	Recommended Measure
1	The BMS communication cable is not connected or the interface is incorrectly inserted	Check BMS wiring harness and connection ports
2	Inverter battery type parameter is incorrect	Check inverter parameters
3	Bad BMS communication harness	Replace the BMS communication harness, UTP is recommended
4	Bad battery BMS communication port	Replace battery
5	Bad inverter BMS communication port	Replace inverter

2.Common Customer Complaints—Utilization Stage

When switching between on-grid and off-grid, the switching time of EPS ports is too long, which cause power failure of some loads.

S/N	Probable Cause	Recommended Measure
1	Inverter EPS mode setting is incorrect	Check the EPS mode setting. Setting 1 switching time is 2-3S, but the standby power consumption is the lowest, setting 2 switching time is about 1S, with bypass function, standby power consumption is low, setting 3 switching time 20ms, UPS function, standby power consumption average 50- 60W
2	When the grid is powered off, it is just in the inverter grid connection stage	UPS switching is not supported at this stage
3	There are too many rectified loads and inductive loads in the home, which will cause prolonged on-grid switching	When there are too many rectifying loads and inductive loads, the switching time can last for 30ms, and some loads will lose power, especially some lamps.
4	The EPS port is connected to an electrical appliance with an impulse starting current load, and exceeds the inverter load capacity	EPS ports cannot be connected to loads with high impulse current, such as water pumps

PV does not generate power or generates little power

S/N	Probable Cause	Recommended Measure
1	Weather reason	Check historical data to see if it is weather reason
2	Set 0 feed in, to meet no feed in logic	Check settings
3	The system insulation resistance value is detected, but the inverter is in the standby state of connection	Check whether the inverter connection is stopped at 1, and check whether the system insulation resistance value is less than 30K
4	Inverter MPPT working mode parameter setting is incorrect	Check the MPPT working mode, it should set to 0
5	The system working state is wrong or the bus voltage state is wrong	Confirm whether the system is in PV working state 5 or 6, and check whether the bus voltage is normal, 400V, 450V, 440V. If the status is wrong, try to restart the inverter

Battery does not discharge

S/N	Probable Cause	Recommended Measure
1	The current battery SOC has reached or is lower than the preset discharge cut-off SOC value	Check the parameters
2	The battery is not allowed to discharge, for example, the BMS allows the discharge current to be 0	Check BMS information, confirm battery working status
3	Inverter is set to backup mode or set to forced charging state	Check the inverter working mode setting and ES control status, 1 is self-use, 3 is forced charging, 5 is forced discharging
4	The battery voltage is under 50V	Check if the battery voltage is under 50V
5	The system working state is wrong or the bus voltage state is wrong	Confirm whether the system is in the battery working state 3 or 6, and check whether the bus voltage is normal, 400V, 450V, 440V. If the status is wrong, check whether the battery port of the inverter has voltage or try to restart the inverter
6	Inverter battery discharge circuit damaged	Replace inverter

The battery does not charge

S/N	Probable Cause	Recommended Measure
1	The inverter set forced discharge	Confirm the status of ES control, 1 is for self-use, 3 is forced charging, 5 is forced discharging
2	The battery is not allowed to charge, the battery BMS allows the charging current to be 0	Check BMS information to confirm battery working status
3	When charging stopped, the battery voltage is over 53.5V and does not meet the conditions for recharging	Check the battery history charging status, check the battery voltage curve
4	In spontaneous self-use mode, the load is larger than the PV power	Check the working status of the system to confirm whether it conforms to the working logic
5	The system working state is wrong or the bus voltage state is wrong	Confirm whether the system is in the battery working state 3 or 6, and check whether the bus voltage is normal, 400V, 450V, 440V. If the status is wrong, check whether the battery port of the inverter has voltage or try to restart the inverter
6	The inverter charging circuit is damaged	Replace Inverter

Bus overvoltage fault :F1: 80000400

S/N	Probable Cause	Recommended Measure
1	Panel open circuit voltage is too high	Check and confirm the configuration of the panel, note the effect of temperature on the open circuit voltage of the panel
2	In off-grid mode, some loads with short-term impulse current will trigger	Some loads are not recommended to be connected to the EPS port, such as water pumps. If they must be connected, a soft starter needs to be added.
3	In the case of weak grid, the inverter control loop oscillates	Need to adjust software PI parameters
4	When in multiple machines parallel mode, the inverter is disturbed	Try to add an inductor at the grid end
5	Inverter damaged	Replace inverter

Overcurrent fault F1: 18004800

S/N	Probable Cause	Recommended Measure
1	Some special loads will cause the inverter to report overcurrent, such as water pumps, washing machines, etc.	Try to add inductance at the grid end, soft start and other measures
2	When in multiple machines parallel mode, the inverter is disturbed and causes vibration	Try to add an inductor at the grid end
3	Inverter hardware damage	Replace inverter

Grid-connected relay failure: F2: 00000010

S/N	Probable Cause	Recommended Measure
1	The inverter is disturbed by the grid	Try to restart the inverter, some old hardware version inverters can try to add an inductor on the grid side to solve the problem
2	There is a problem with the relay control circuit
3	Grid end cement resistance failure	The cement resistance can be skipped by setting the parameter. Reserved 1 is set to 1 to not use the cement resistance, and set to 0 to use the cement resistance.