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Passive? So if you have a bad battery, it drags both of them down? ;) Unfortunately, that's how the passive balancers work. They will use the higher voltage battery to discharge into the lower voltage battery until the voltage is the same. If you have a failing battery with a dead cell, or...

Personally, I would feed 2 smaller solar panels into 2 charge controllers, one for each battery....Then it'd be practically maintenance-free with no requirement for 110v... But, that's just mission ready stuff, not bringing back dead/depleted batteries... Plus, you'd be able to tap off of one of...

$400 for an equalizer, or $100 for a 2 bank charger/maintainer? :-p

Just a heads up... The small solar panels are usually Solargizer, and they're NOT chargers, they're desulfators and maintainers.. They prevent sulfation when sitting for a while, to keep them mission ready. They will not charge batteries.. Using a 2 bank 12V charger, which charges each battery...