About The photovoltaic inverter output wire is too thin
If the solar array pushes too much electrical current through too thin of a wire, the metal conductors get hot and can melt the outer insulation, which becomes a dangerous fire hazard.
If the solar array pushes too much electrical current through too thin of a wire, the metal conductors get hot and can melt the outer insulation, which becomes a dangerous fire hazard.
I'm using a SolarEdge inverter and after it synced with the optimizers, we got a "AC Voltage Too High" error (and apparently it also burnt out his test meter, or maybe it was a coincidence, but it would no longer turn on).
The cable is too thin and not chosen in accordance with AS3008 regulation. When the inverter AC output is far away from the meter box, the cable shall be lengthened and increased, and 10% of the carrying current margin shall be realized.
After going through the voltage loss calculators and getting a good sized wire for a 12 volt 2000 watt inverter, I found out about ampacity. Turned out that for these short runs voltage loss is negligible, but you need to be sure your wire has the ampacity to handle What your inverter will pull.
To verify an impedance problem, shut the inverter off and measure the line voltage at the inverter AC input. If it is something close to 240, then flip that breaker off and start looking for a bad connection. If you need to re-run it all in 4 AWG to meet code, the problem may just go away on its own.
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6 FAQs about [The photovoltaic inverter output wire is too thin]
What happens if a PV inverter is tripped?
PV inverters have a mandated normal operating voltage window, and excessive voltage drops in cabling that effectively moves the nominal operating voltage seen at the terminals of the inverter to one end of this window can result in nuisance tripping of the inverter and an associated loss of generation.
What happens if a PV system has no inverter?
If there is no inverter then there will be no inverter input, inverter output, or AC branch circuits. If the system has no DC lighting or loads, there will be no DC load circuits or DC branch circuits. If there is no combiner box then there will be no PV output circuit.
Why isn't my SolarEdge inverter working?
If the voltage with the inverter off is much higher than 240 volts, then a high line voltage from your utility is contributing to the problem. The SolarEdge inverter allows bigger than 6AWG wires on the AC output side, which is where the issue lies according to the error code. (Description: AC voltage surge)
Do PV inverters need to be derated?
The PV system owner will not be allowed to connect a higher AC power system to the grid without another torturous trip back through the utility analysis queue, so the result is that the new inverters need to be derated to keep the interconnect AC rating the same.
Why isn't my inverter working?
If the voltage with the inverter off is much higher than 240, then a high line voltage from your utility is contributing to the problem. If it is close to 240, then check for a bad connection. The problem may go away on its own if you need to re-run it all in 4 AWG to meet code.
What happens if inverter AC output is far away from meter box?
When the inverter AC output is far away from the meter box, the cable shall be lengthened and increased, and 10% of the carrying current margin shall be realized. The AC breaker is incorrectly configured. The quality of AC breaker is poor. The temperature is too high. The cable is too thin and not chosen in accordance with AS3008 regulation.
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