4 Frequently Asked Questions about “Solar inverter input overcurrent - RRR Renewable Projects (SA)”
What are the protection functions of a solar inverter?
The protection functions are as follows: The overcurrent protection should be set on the AC output side of the solar inverter. When a short circuit is detected on the grid side, the solar inverter should stop supplying power to the grid within 0.1 second and issue a warning signal.
What is a DC input overcurrent fault on a Solis hybrid inverter?
On Solis hybrid inverters, DC input overcurrent fault is the PV inputs, has nothing to do with batteries. If I over panel a mppt input ( add a string temporally from a second Solis inverter ), in partly cloudy weather when the Sun becomes unshaded, I get that message and the inverter goes into fault mode.
Why does my inverter keep switching off?
On very sunny days, between 1100 and 1200 local time, the inverter will switch off for a few minutes recording a “DC input overcurrent fault”. I can see from the graphs available that this occurs when the batteries move from 99% to 100% charged and the inverter DC voltage, spikes from 2x 330v (=720v) to 2 x 387v (=774v).
What should a solar inverter do after a fault is removed?
After the fault is removed, the solar inverter should work normally. The solar on grid inverter should have lightning-prevention protection function, and the technical index of the lightning protection device should ensure to absorb the expected impact energy.
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