For microgrid systems, diesel generators are often used to power CHS2. Customers often need to connect the diesel generator output to the Backup load at the same time, so that the load can be directly powered when CHS2 is abnormal. The following connection method is not allowed. If it causes damage to CHS2 due to backflow, our company will not provide warranty.

Even if the customer adds an ATS as a switch in the loop, the ATS is very likely to be damaged by voltage backflow when there is power on both sides.

If the customer needs to add a maintenance circuit, it is recommended to add an MCB and a manually controlled ATS to ensure that the maintenance circuit is only started when the CHS2 is shut down, thus ensuring the safety of the CHS2 equipment.

The battery charging and discharging status of CHS2 is not entirely determined by the grid status. Whether the system charges the battery or whether it can be charged with grid is determined by the operation scheduling strategy.

In the scheduling strategy, users can define charging period, discharging period and standby period, etc. If the system is in standby or discharging period, the battery will not be charged even if the grid is available.

The battery cabinet door cannot be opened during equipment operation. It can only be opened when the equipment is shut down for maintenance.

If the equipment is running and the battery cabinet door is opened, it will be considered a system abnormality, the battery will stop outputting, and the system output will be interrupted.

It is recommended not to open the cabinet door unless necessary.

In addition to the overall load overload, the system may also be powered off due to single-phase overload. If the single-phase load exceeds the load specification, the system will also be powered off due to overload. The maximum single-phase load specification of CHS2 is 18KW. If the total load of a phase exceeds this value, the system will be powered off due to overload even if the total load does not exceed 50KW.

Under normal circumstances, after the grid is lost, the battery should be discharged to continuously provide power to the load.

If the load loses power after the mains power fails, the following issues need to be determined:

1. First, confirm whether the load is connected to the Backup Port. Only the load connected to the Backup Port will continue to provide backup power output after the grid is cut off.

2. Is the battery capacity normal before the mains power is cut off? If the battery capacity is continuously very low and is near the lower limit of low voltage, it will not be able to provide output after the grid is cut off.

The AC input three-phase voltage of CHS2 must be in sequence with an angle of 120 degrees. If there is a problem with the wiring, an alarm will be issued for phase sequence error.

The following actions are required:

1. Check the wiring of the input power line to see if there is a problem with the cable color that causes the phase sequence to be reversed.

2. If the cable color sequence is found to be correct, it is recommended to check it with a phase sequence meter. If there is no phase sequence meter, you can verify it by the cross method to find the correct phase sequence.

When CHS2 is shut down due to low discharge capacity, it is not shut down completely according to the capacity of the entire parallel system; as long as the capacity of one CHS2 in the system is lower than the limit value, the low discharge capacity shutdown will be executed.

CHS2 will balance the outputs of each system when discharging, but there may be a situation where the gap is too large, or the capacity of a device may be too low and trigger first.

If the CHS2 suddenly loses power during operation, and low battery capacity and overload are excluded, the most likely cause is a sudden increase in inductive load.

If more than 20% of the CHS2 loads are inductive loads (mainly motors or impact loads), there is a high probability that the instantaneous impact current will be too large, causing the system to power off. In this case, the subsequent action is a system reset with an abnormal alarm, such as PV over-current.

After CHS2 is connected to the diesel generator, the start of the oil engine can be manually controlled through CHS2.

If the customer needs to start the diesel generator, manual operation is not allowed directly on the diesel generator interface. It must be operated on the elekeeper APP interface, change the diesel generator working state of CHS2 to manual, and then start or shut down.

The APP manually controls the start and stop of the diesel generator. It is generally recommended to use it only during the commissioning phase. After the system is running normally, please switch to automatic control mode immediately.

To start the diesel generator without APP operation, make sure that CHS2 is in shutdown state.

The PV started working during the operation of the diesel generator, but the diesel generator did not stop working. This is because the condition for the diesel generator to shut down is that the battery SOC reaches the limit. The diesel generator must charge the battery to the limit value before the diesel generator stops naturally. PV charging is not related to the working status of the diesel generator. If the customer considers that the PV energy may be wasted, it is recommended to set the SOC limit to a smaller value.

After the CHS2 is turned on, as long as the PV or battery is powered, there will be an indication on the inverter panel. If you can't see anything , please check whether the light on the front of the inverter panel is too bright and the sunlight is seriously reflected, resulting in unclear vision.

If this reason is excluded, it is recommended to open the inverter panel after shutting down and check whether the LED communication cable is disconnected.

Phase loss is one of the abnormal conditions of the power grid. The energy storage system will not be able to draw power from the grid for charging. At this time, it will enter the off-grid state. If the customer's load is connected to the backup port, it will continue to provide power output to the load. If the customer's load is not connected to the backup port, it will not be able to provide normal three-phase power supply.

The low photovoltaic power generation is mostly caused by photovoltaic panels. Possible reasons include: whether the photovoltaic module is blocked, the surface is not cleaned in time, resulting in too much dust, the orientation of the photovoltaic module is different, and the barrel effect caused by hot spots or damage to the panels; it is also necessary to check the wiring, whether there are problems such as inconsistent string lengths or modules with different orientations connected to the same string .

If the above reasons are excluded, please check the power output limit of the PV inverter to see if it limits the output power of the inverter. If so, please increase the power limit.

System overvoltage means that the inverter grid voltage is too high and exceeds the alarm limit. The main reasons for this are: 1. The voltage of the grid itself is too high, that is, the voltage value output from the transformer is originally high. In order to take care of the normal power supply of distant areas, usually increase the voltage of the transformer, resulting in an increase in the overall grid voltage. 2. Weak grid effect. Because the cable is relatively far away from the transformer, the overall cable voltage drop is too large, resulting in an increase in the voltage at the inverter end. The solution is to add energy storage device or reduce the output power of the inverter, reduce the current value of power sent to the grid, reduce the line voltage drop, and thus reduce the inverter voltage.

The abnormal communication of the meter is caused by the fact that the CHS2 cannot detect the meter during operation. It is necessary to check whether the RS485 connection of the meter is normal, whether the line is loose, or the cable of the connector is broken.

The load will lose power after the grid is lost. The main reason is that the load is not connected to the Backup port of CHS2. After the grid is lost, the Backup port of CHS2 can continue to output and provide continuous power supply. If it is not connected to the backup port, it will not be able to maintain power supply.

In addition, in the diesel generator working mode, after the diesel generator stops working, there will be a short downtime in the middle when it switches from the diesel generator state to the off-grid output state. Because the diesel generator working state is off-grid, it takes a conversion time from the off-grid state to the inverter state, which lasts about 60 seconds.

If the switch is not lit during the system grid connection, first make sure that the EMS is powered normally; then check whether the network cable is connected correctly, whether it is connected from the LAN port of CHS2 to the switch, and then check whether the network port is not connected tightly or loose. If these two problems are eliminated, please replace a network cable and try again.