No idea what you're talking about here. Solar charge controllers are quite mature and do exactly what is needed. You're literally putting a few wires on the ri

No idea what you're talking about here. Solar charge controllers are quite mature and do exactly what is needed. You're literally putting a few wires on the right terminals, and a few connectors. Only the low-battery signal would require a bit of work, but that is option and isn't found on ANY devices available off-the-shelf so it's not possible to buy your way around that.