I’ve got twelve 100 watt Renogy panels, two series strings of 6 panels, wired in parallel.
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For weeks the app showed a max voltage of around 122 volts, which is about right since the Vmp is 20.4V (6 x 20.4V = 122.4V for each string.)
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Then out of the blue the app suddenly shows 145.9v when the AC500 starts beeping about “over voltage.” On top of this it’s cloudy and rainy, with only a few spots where the sun peeks through.
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So, how did my 1200 watt array suddenly go from 122v to 145.9v, AND on a rainy/cloudy afternoon? I can only guess it somehow peaked at 150v which set off the alarm.
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Is it because it reached 100% charge so the MPPT stopped converting voltage to current? (Notice Power = 0)
@St8kout When the temperature is low, the open-circuit voltage at the moment of solar panel filling will be a little higher than the marked open-circuit voltage.
BLUETTI’s machine has overvoltage protection, clear the error report. Kindly no worries 
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