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Originally Posted by Camelopardalis
Respectfully glend, I disagree. I've been doing some homework into solar with battery storage for our home and Tesla only quote 70% capacity after 10 years.
While I hope that in 10 years time the replacements will be a lot cheaper, the Powerwall units are still quite costly at the moment. For a good sized home, it almost makes more sense to buy the EV and use it as battery storage. Especially as a retiree or a "work from home"-ee...
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I agree with you on this Dunk, in relation to home batteries, because the recommended life span of EV batteries is seven years. The big limiting factor on Li battery life is charge cycles, they have a finite number of cycles. So i am not at all surprised about a 10 year replacement term, in fact I would suggest that is optimistic.
I have an AGM battery bank attached to my (standalone) shed solar system, which has been in place for nine years now. I am on second set of 4 x 100AH AGM batteries. Given the cost of the batteries, I cannot make a business case for doing it again, but it has been an interesting technical exercise.
I will not buy a Powerwall or other home battery solution, especially when I can sell my excess home roof generated power to the Grid for no added cost. The business case for my home rooftop, return to grid system, had a three year payback, nine years ago.