I'm in So Cal, on SCE, residential single-phase utility power, pre-PTO since May 5 with 11.2 kW of solar, a Powerwall+ with the 7.6 kW Tesla Inverter, Powerwall 2, and Gateway Backup 2. The app powerwall settings show Self-Powered and 'No" for Permission to Export. Backup reserve is set at 20%. My batteries have never below 35% since May 5. I have stayed under the max output of my 2 Powerwalls since except for 1 hour. So theoretically, virtually all of my power should be coming from solar / battery, and indeed, the App shows a net grid use of -1.8 kWh since May 9. Despite all this, the utility says I'm using 8 kWh on average per day.
In the process of troubleshooting I found that the meter is showing a draw (positive wattage, i.e. "spinning" forward) when I have a load running on one split phase / hot leg, but showing an export (negative wattage, i.e. "spinning" backwards) when I have a load running on the other split phase / hot leg. The amount of wattage the meter shows, positive or negative, is equal to the net difference in loads between the two split phases. In the troubleshooting process I was able to turn on loads on each split phase to effectively zero the meter out to show no draw or export. Any 240 volt load will not show up on the utility meter because 240 volt loads evenly pull power from both phase, so it's a net zero at my meter.
Is this normal or indicative of a problem? What type of problem? I should not be drawing power, and I should not be exporting, so it has to be a problem, right?
I sent all this to my certified installer and am waiting for a response, but hoping someone with some experience or expertise can tell me I'm not crazy in thinking something is really wrong.
In the process of troubleshooting I found that the meter is showing a draw (positive wattage, i.e. "spinning" forward) when I have a load running on one split phase / hot leg, but showing an export (negative wattage, i.e. "spinning" backwards) when I have a load running on the other split phase / hot leg. The amount of wattage the meter shows, positive or negative, is equal to the net difference in loads between the two split phases. In the troubleshooting process I was able to turn on loads on each split phase to effectively zero the meter out to show no draw or export. Any 240 volt load will not show up on the utility meter because 240 volt loads evenly pull power from both phase, so it's a net zero at my meter.
Is this normal or indicative of a problem? What type of problem? I should not be drawing power, and I should not be exporting, so it has to be a problem, right?
I sent all this to my certified installer and am waiting for a response, but hoping someone with some experience or expertise can tell me I'm not crazy in thinking something is really wrong.