I would urge anyone who is trying to decide what they think is a simple question "how many Powerwalls should I get?" to read this thread from the beginning for the excellent, really good explanations from some other posters.
The responses were triggered by my initial order of 16.32 and two powerwalls, which I learned is a mismatch in a couple of perhaps important ways but is something that Tesla will sell.
Its new technology, and a complicated question, so you get a complicated answer.
What I need to do next while waiting for permits is link to the "how many Powerwalls do I need to deal with a central A/C unit turning on in an outage?" thread, which addresses what is to my mind the second, bit technical question.
I would say more than one, without question. There are many posts from a person who has had alot of trouble with two, despite the fact that Tesla says two Powerwalls will provide whole home back up. Its one reason I went to three. I am not sure, by the way, that three Powerwalls is a sure fire no-way-it-can't-work solution either, so I plan on testing.
Be aware, by the way, that less than three Powerwalls very likely leads one into a "partial back up" wiring situation - there is no way around it, unless you have a home which uses very little electricity. I believe, although there is no thread on it yet that I have seen, that the extra costs in doing the extra wiring (including extra sub-panels) really operates to make the "third Powerwall" even cheaper if the "extra" powerwall allows you to avoid the extra cost of the partial home back up electrical work.
