News

Tesla Inverter Backup Habits – Tesla Motors Membership

There was some previous discussion of this in other threads, and it does seem this is a feature of the new Tesla inverters. (Other inverters also can do this, but I do not believe Tesla previously supported it in its installs.) It does seem like an improvement, and I think the best part would be if the communication that handles this avoids the need to raise the house frequency and the nuisances that come with that. It would also be interesting to know if there is any reason this is better (or worse) for the system components.

But I would note that in terms of maximizing production when off-grid, it is only a small benefit. The past behavior was to stop solar at ~98% and then enable it again when it drops a bit, say ~93% (numbers are in the range of what I found in my testing, but it does vary by system.) The new behavior apparently is to maintain at ~98%. But, in both cases, you are losing solar production when you hit 98%, because there is no place to use/store that solar. Meaning, the only real difference is that at the end of the day (or, when your home load exceeds solar production) your battery, which would have been in the 93-98% range, is now at 98% all the time. While not nothing, this works out to about a third of a kWh of stored energy lost per PW. (And, as long as you can still make it through the night, you would make that amount up the next day, so the loss is not cumulative.)

 

Related Articles

Leave a Reply

Your email address will not be published. Required fields are marked *