I posted this in a general Questions thread but the Powerwall forum is probably more appropriate.
In my continuing investigations into why my Smart Meter appears to be over-reading or logging reactive power, I have noticed that the the gateway api raw data download “site” values are sometimes positive and sometimes negative. e.g.
The “Load” values are always positive.
The api downloads “instant” readings. Does it depend on where in the AC “sine wave” it takes the reading, i.e. could it hit and return a value in the the negative part of the cycle? Or is it actually recording export when there is a negative value?
We do know that the Tesla Powerwall both imports and exports small amounts of power while supplying battery power to the house and maintaining the AC-DC inverters “'ticking over”.