We have been using Electrodacus. Reasonably priced, configurable, and you use external relays to control stuff, so YOU control the size of the relay you need, not the BMS manufacturer. The guy who designed and makes these lives in the Canadian Outback, off grid, and uses his own product. And provides excellent support.
Details on our setup here.
https://svsoggypaws.com/electricalsystems.htm
Electrodacus website here:
ElectroDacus
Discussion board/support forum here:
https://groups.google.com/g/electrodacus
I second the suggestion for Andy's Offgrid Garage on Youtube. He's very good.