Inverter building using Wiseguys Power board and the Nano drive board

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phil99 Guru Joined: 11/02/2018 Location: Australia Posts: 2543	Posted: 07:34am 15 Mar 2025         Quote   17Kw, over 30kW peak, into the Inverter for at least 6 minutes. About 2kWH has been dumped into something! Your microwave can cook a meal with about 0.5kWH so what ever it was will have got extremely hot, possibly damaging things around it. It may be worth opening up everything that was live at the time. The mains is good at blowing resistive faults clear (if it doesn't start a fire!) as the peak current can be many hundreds of amps. At my switchboard the supply impedance is 0.3Ω so a fault peak could be over 700A. You can get an estimate of your supply impedance by switching a 10A heater on and off, measuring the change in the mains voltage. Repeat a number of times and get the average (the mains voltage is always fluctuating a volt or two, masking the change to some degree). The impedance is delta V / delta I