Would a generator be able to supplant the grid? In effect have an auto-transfer but to the diesel/natural gas/propane generator? The generator would be idling except when power needs exceeded solar panels' capacity.
Might feel like a step backwards in terms of environmental impact, but presumable the fuel used would be minimal while the sun was shining or batteries not empty.
Might feel like a step backwards in terms of environmental impact, but presumable the fuel used would be minimal while the sun was shining or batteries not empty.