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I am super interested in this, is there a grid tie solar box out there that supports heterogenous battery chemistry like you are describing?

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Not sure if this is applicable?

https://www.bos-ag.com/products/le300/

Not sure - but very easy to make with off the shelf Victron products. I use their DC-DC charger and their charge controllers and have had great success so far.

This guy also has a lot of educational videos: https://www.youtube.com/c/WillProwse

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