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EMBARRASSING UPDATE: The National Grid guys have just been. That was amazing service: I only made the phone call a couple of hours ago. After testing the voltage coming to the house (all normal) they noticed that the trip switch on the fuse board for the inverter was up! It must have tripped...

Hi there! We've got a domestic PV array with a Sunny Boy 1700 inverter that's worked faultlessly for a decade. Last week there was a power cut in our locality, and excitingly, a big lorry with a generator turned up and was connected to the little substation that's in our road just a few doors...