ROI or payback was never an issue for us we bought some land and started with a 60w panel some old batteries and a petrol generator. We built our system and house oner the years.
Our system now is:
German solar panels 195w x6
Batteries Hoppecke 2v 800ah @24vdc
Outback MX60 that also controls...
Nice to see people getting into renewable energy.
Miriam and myself have been living off-grid (no mains connection) since 2002. Our system at the moment is 1kW of PV and a 3 meter diameter wind turbine around 2kW charging a 800AH bank of led acid batteries @ 24VDC
All lights in our house are...