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We have one of these devices and it seems to work well. It lets our 4+ ton A/C start when under battery power. It just comes up to speed a little slower. Ours was included as part of a Tesla installation.

Making the numbers work for you definitely depends on your situation, home construction, and environment. For us one big concern we have is losing power. We have had at least 3 power outages a year the last 2-3 years. Some lasting upwards of 48 hours. We work from home, so no power directly...

Thanks to the OP for asking this question. I have solar and 2 Powerwalls and was wondering about this. The solar + Powerwalls saves us quite a bit on power every day from Spring through Fall and kept us going through far too many power outages. I do have an order for an F-150 Lightning so was...

Have you looked into solar and batteries? We have solar and batteries (Powerwalls) and do not buy electricity much of the year. Many months the electric bill has dropped from upwards of $600/mo. to $15-20/mo. In SF East Bay on sucky PG&E (another reason to have batteries!).

The only time I have heard of that type of backup is on a heat pump. Not on a natural gas unit with their 80,000 to 130,000 BTU capability.

Exactly. Very few of us were around then, but in the 1910s to 30s there were Ford gas stations. Henry saw the same issues that Elon did. If Henry wanted to sell cars, he needed to make it easy for owners to keep them filled up and moving.