Hi,
I’m currently starting with Home Assistant in my home and added all our Energy consumer and I should already cover most of it in our house. Still, there is a significant load over the night which doesn’t map to the existing customers. I assume that the missing 150-200 watt are produced by our Tesla Powerwall 2 itself.
Therefore my question: does anyone know how I can calculate the “self-consumption” value from the powerwall either based on the sensors from the Tesla Powerwall integration or somehow calucated via powercalc?
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Not sure, if/how this is going to help you, but here’s my experience re. the Tesla values:
Mine are generally off by +/-7.5% compared to what I see from the Enphase inverters.
This is mainly driven by the production values reported by Tesla, but it seems to ripple through to the consumption calculations as well. Took me a while to figure out that I cannot rely on what comes across from the Tesla API.
Here’s a comparison:
According to the Tesla values on the top, I had about 820W of consumption that wasn’t accounted for by my various power sensors (this would be from all kinds of electronics plus something like ceiling fans, etc.).
This is based on the Tesla production value which is almost 400W higher than what the Enphase inverters are reporting.
Looking at the result of my calculations based on the Enphase production, I only have 410 of unknown consumption which is much more realistic.
As I said:
Not sure, if that helps, especially because you write that your issue seems to occur over night where the Powerwall would not report any production 
And, just as s side note, here’s a quick image of how often Tesla (production) is overreporting by how much:
