Hi Cor etc I have the same issue, our pole pigs are set to 250V split phase no taps (taps only at local sub station) due to rural feed on an extension cord company (rural coop) so the folks far away get 240ish. This causes the solar Enphase 64 inverters to hit 264V at 2pm and then pop. Since Enphase didn’t do a FMEA , I found out from the recorded data, dying on high line after about half of them died. The fix (since the power company refused to change the sun station tap, said they did but didn’t ) is to get two 6.3V toroid core 120V transformers (can not be EI core for idle losses) and put the secondaries out of phase in buck mode in series with each 120V hot side thus reducing the 250V to 237.4V and the inverters no longer drop out at 264V and pop. My 3 EV charging stations for the Leaf, Bolt and Tesla don’t care since they have wider range switching power supply/chargers in the cars and don’t see over 250V since they’re a load and not a source. Btw, I really love the Tesla Amazing way it pre refrigerates the batteries to charge at 250KW seamlessly through the highway super chargers. My other EVs don’t come close on trips. Have a renewable energy day Mark in Roanoke Va
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