I bought a house with Tesla solar panels (PPA) a few months ago, and now that summer temps are heating up I'm taking a closer look at the bill. It seems like the Tesla app is grossly under-reporting my usage. Here are some screenshots from one day, but it seems to be a similar issue every day. I do not have a home battery. I charged my car overnight, so the high usage between 12-7am makes sense. The SCE bill shows that I used 77 kWh this day, while the Tesla app shows I used 34 kWh. Am I reading this wrong?
The Tesla app lets you export daily usage data in CSV format. So I took this and lined up the monthly start/end dates to match my SCE bill. With Tesla's numbers, I subtracted the total "From Grid kWh" from the "To Grid kWh" and it shows I produced a net surplus of 108kWh for the month of June. But according to SCE, I actually consumed a net positive of 335kWh. So Tesla's data appears to be off by 443kWh, in other words a 132% error!
The Tesla app lets you export daily usage data in CSV format. So I took this and lined up the monthly start/end dates to match my SCE bill. With Tesla's numbers, I subtracted the total "From Grid kWh" from the "To Grid kWh" and it shows I produced a net surplus of 108kWh for the month of June. But according to SCE, I actually consumed a net positive of 335kWh. So Tesla's data appears to be off by 443kWh, in other words a 132% error!
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