Interesting regarding your PW battery capacity value.
I went back in the history on my original powerwalls (since the one that was just replaced is still showing my system despite being unavailable now) and have come to the following:
- When Did Tesla Official Integration Start Showing Battery Capacity? - My history for battery capacity starts on Feb 8, 2024, so I’m wondering if the official Tesla Integration didn’t add or get this data until that time. Which could be why yours only goes back to Feb 2024 as well.
- Original 2021/2022 Powerwalls vs. New/Refurb from 2025 - Both of my original Powerwalls that were installed in 2022 have always been under 13.9 kWh. In fact, the one that faulted shows that it was averaging 13.7 kWh and the one that I still have is around 13.85 kWh. This new one (installed in 2025) started at 14.6 kWh and is now 14.5 kWh.
Reporting Obervations between Tesla & Enphase - This is super interesting data! And you just burst my bubble…I have a whole dashboard created for calculating my expected payback date and I now believe it’s overestimating that since I disabled the Enphase Envoy integration and have been soley using Telsa…
haha
In looking at the data between Tesla and Enphase over the last month, I’m finding the following for my system for a 30 day sample:
- Tesla is consistently reporting 0.1 to 1.5 kWh more than Enphase.
- Low Production Days (e.g. 0.6 kWh) show a higher percentage difference (33%) than High Production Days (e.g., 50 kWh, 1% over reported).
- Tesla is reporting more production than Enphase in my system by an average of 2-3%, at least for the last 30 days.
In building my payback dashboard, I was super focused on calcuating outflow during peak and offpeak times. After numerous attempts, I finally got it to effectively be off +/- 1-2 kWh a month from what my energy company bills/credits me for monthly. So, I was blindly trusting Tesla to report accurate production since my energy company doesn’t have this data. As previously discussed in this thread, I did run into an unresolved issue creating utility meters off of the official Tesla integration, so I had to get creative with some other actual powerflow templates to get that closer to the Telsa app. Other than that, it seems like it’s been reasonably close to what I thought the “truth” is.