Solar Update

I haven’t done a solar update since September. Our system for November generated 1378 kWh. We used 817 kWh and sent a total of 516 kWh back to the grid. Total for the system since August: we have sent 849 kWh more power back to the grid than we have used, with most of that being in November because of a combination of two things:

• We are making an average of 46 kWh per day because it’s been pretty sunny. There were only a couple of days where it was cloudy for the month, and we don’t get thunderstorms every afternoon like we do in the summer
• we just aren’t using much power now that the weather is cool enough for the air conditioning to not be running.

For 15 days in November, we generated more than 50 kWh, despite the fact that hours of daylight are getting shorter.

We only used power than we consumed for 5 days in November. The worst of these was a 48 hour period (November 6-7) where we used 18 kWh more than we generated. During those two days, we generated 20 and 25 kWh, but used 32 and 31 kWh.

So far, it appears as though the solar power system that we installed is working as well as I had hoped. Things do get a bit tight in the heat of the summer, as air conditioning uses so much power that, if the grid were to go down for an extended time, we might not have enough power to run everything without making some conservation moves when it’s a bit cloudy or if it’s unusually hot. Perhaps by turning off the water heater or by not doing laundry on days when it is cloudy or unusually hot.

The problem isn’t generation capacity- it appears to be storage. If I add even one more Powerwall to the system, this will correct the issue.

So for us, twenty four PV panels of 420 watts each gives us more than enough generation capacity. We currently have 27 kWh of Powerwall storage capacity, and could really use about 8 or 10 more, which would mean true independence and the capability of being off grin indefinitely.