The inverter does not respond when it starts up?
Possible reasons are:
- The DC voltage does not meet the starting conditions
- The positive and negative poles are reversed
- Inverter failure
Troubleshooting measures:
Make sure that the DC input line is not wrongly connected. Usually, the DC interface has a fool-proof effect, but the wire-passing terminal has no fool-proof effect. It is very important to carefully read the inverter instruction manual to ensure the positive and negative poles before crimping. The solar inverter has built-in reverse short-circuit protection and will usually start normally after the wiring is fully restored.
No DC voltage output or unstable voltage output?
Troubleshooting measures:
If the fuse is intact, there is no output of DC voltage at all levels under load. This situation is mainly caused by the following reasons: open circuit and short circuit in the power supply, failure of the overvoltage and overcurrent protection circuit, failure of the auxiliary power supply, failure of the oscillating circuit, overload of the power supply, and rectification diodes in the high frequency rectification filter circuit. Breakdown, filter capacitor leakage, etc. The high-frequency filter circuit is mainly composed of a rectifier diode and a low-voltage filter capacitor to output DC voltage. The breakdown of the rectifier diode will cause the circuit to have no voltage output, and the leakage of the filter capacitor will cause failures such as unstable output voltage. The damaged components can be checked by statically measuring the corresponding components with a multimeter.
Poor load capacity?
Troubleshooting measures:
Poor load capacity of the inverter is a common fault, which usually occurs in old-fashioned or long-working power supplies. The main reason is that the components are aging, the switching tube is unstable, and the heat is not dissipated in time. It should focus on checking whether the Zener diode has heat leakage, the rectifier diode is damaged, and the high-voltage filter capacitor is damaged.
Residual leakage current fault (GFCI fault)?
The reason may be:
- Line insulation
- The photovoltaic system itself leaks electricity
- Grounding problem
- Machine failure
Troubleshooting measures:
- Confirm whether the fault can be recovered. If it can be recovered, please simply check whether the AC and DC lines are soaked in water, damaged, and whether the distribution box is flooded.
- If possible, measure the impedance of the AC line to the ground with a megger to check whether the grounding is not done well.
- If there is a backup machine or a machine of the same model nearby, other machines can be used for replacement and comparison. If the fault does not occur, the original machine may be faulty.
- Try to replace the output board, control board or inverter to solve the problem.
