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WindyMiller That’s probably the issue, whenever I test the votage at any power point, the reading is ´normal´ (240-250 V), it is only when the solar panels are producing a good amount (2.5-2.8 kW) when the reading on the power point and on the inverter LCD goes above 253 V.
Hopefully that is something I can discuss with the DNO technician and come up with some solution.
My concern is, as you pointed out, that if I increase the over voltage limit and let the inverter work on 260 V, it also means that my appliances will also be on 260 V.