The component to wire this to the house electric system are slowly being gathered.

I top off the battery every few months, but the leakage current seems minimal. Only a loaded test will tell how much capacity is still usable from the battery.

I also need to find a way to power this with renewable energy. The water wheel seems to be the best options in terms of cost benefit and complexity, but finding a copper line to cover the 200-300 meters between the house and the water stream is not easy when you have no budget.