So my inverter is failing and so I'm using that as an excuse to move my battery bank from 12V to 24V. Have been curious about this for years and wondering if anybody knows the answer: Pretty much _every_ solar charge controller will work with 12-48V nominal... but there are _no_ inverters, 120/240V battery chargers, DC-DC converters (which is pretty much what a solar controller is), etc etc etc, literally anything else involved in the system, that isn't specific to 12, 24, 48V. Why is this? The easy answer is "it would be more expensive", sure, but then why aren't solar controllers that way too? There are a handful of cheap 12V-only, and some 12/24Vs, but most are 12-48V. A 24V or 48V _only_ charge controller does not exist, as far as I can tell.