Cable length query for solar charging

[lucus30]

Thats the go... with a genny as "emergency" I'd bring the 12 volt panels as close in as possible and take whatever you can get.
Even at 50% they will handle what you have mentioned so far

When it is time for Big Mans Shed remember the higher the voltage the skinnier the wire so I'd def go domestic panels with a small off the grid inverter and battery bank not 12 or 24 Volt.

I agree with evil twin this is what I'd be doing. Didn't realise it was a temporary set up