this post was submitted on 17 Jun 2023
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Indeed, but they need to be also be made available for people to buy and that usually still involves a lot of further product development. Right now it seems more common to just re-purpose automotive lithium-ion batteries for stationary storage, which might be better than lead-acid batteries, but really isn't ideal either.
That's what hackerspaces and fablabs are for!
Disclaimer: I am a member of a fablab that explores open hardware automation and solar techs :-) We have talked about producing batteries but have too many items on the todo list for now