There have been many posts about PW not charging at the published rate. While there are some restrictions to comply with local ordinances I came across another criterion last week.
I noticed the PW was only charging at 1.7 kW while we had a net export of 2.5 kW. Over the morning the charge rate slowly climbed and only returned to >4 kW after a few hours.
It was a cold morning that day. The battery is housed in a unheated barn and was certainly below 4C.
I mailed Tesla support and they confirmed :-
Our latest firmware version, 1.11.2, contains some performance improvements related to the battery’s operation in cold climates.
The software will now operate like this:
- A scheduler will predict how much solar is likely to be produced on a given day based on the data that the battery records over the past week
- Based on this scheduler, the software may conclude that is worthwhile to heat up the battery cells to make them available for power conversion
In the case of yesterday, when your solar panels produced a lot of solar (>6000 kW peak around 12:00), the “heat mode” would’ve been triggered and the cells would’ve been warm enough to be able to convert power at full capacity.
...sure enough the following day the FW was updated from 1.10.2 to 1.11.2