This is exactly what I have been wanting to do with my 2019 rav4 hybrid. If you have a source for the controller, I'd be happy to go in on a group buy sort of thing. If its as simple as connecting the controller to the main pack, and adding additional batteries that can be grid charged, that would be a home run. My only caveat is that I do not want to damage my brand new pack in any way or mess with the warranty if it does get damaged.
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