Emon Solar APP web page often suggests I’m exporting more power to the grid than what my solar generation feed suggests I’m creating.
I’m wondering if this has something to do with my solar inverter setup.
My solar setup is Enphase microinverters. So instead of 1 x 240 volt AC inverter to monitor, I have 16 inverters feeding to the electricity meter.
Reading the Enphase micro inverter specification sheet I note that the AC voltage from the Micro inverts have a very broad voltage range. 211 - 264 volts.
I’ve not yet measured the voltage at the meter board to see what is coming down from the solar (not at home during the day).
I’m wondering if the under voltage (< 240 volts) and over voltage condition (> 240 volts) is causing the calculation of the Current Transformer observed solar watt generation to be mis calculated?
If you think this is a possible cause, maybe a solution is for me to buy another EmonTx and dedicate this to solar feed in measurements. They key being that the the 9v AC reference adaptor would be powered from the solar feed circuit (not the street utility feed) and would vary the apparent power calculation for the solar automatically?
i.e: as the Solar AC voltage fluctuates over time, the solar connected 9V AC adaptor would see the change in the reference 11 volts, and adjust the formula for calculating solar watts ( ? )
what do you think?