For the moment some random cheap ones from Amazon - I haven't run it long enough to see if it will last more than a few months of full-time use. The battery was a freebie, so I don't actually recommend it; the charger is an "ULTRAPOWER 4a". We'll see.

What it's augmenting is a pretty cheap AIMS power brand modified sine-wave inverter/charger (meh, should have gone pure sine, it causes some of the power supplies to make funny noises) hooked up to a Litime 2kWh LFP battery (very happy with the big battery). TODO on the experiment is swapping out the inverter part with direct 12V conversion for some of the things on the inverter, but I wanted to test the regulator approach with a non-critical component for a month or two first before hooking it to something that can deliver 100A, obviously with a fuse. :-)