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Do you have your two leisure batteries connected with an isolator / switch set up so you don't have to manually disconnect and reconnect to the solar?
What are you running off your leisure batteries?
We've got a 110ah with solar and run a pump for the sink, charge phones etc and plan on wiring in the stereo and we barely deplete it..
M_A_X-
Big dometic 110L fridge/freezer, and given I'm in Spain it needs power. . Laptops when working. Its overkill but why not, easier to overbuild when doing it than change later. Also charge ebike battery
Yes got Abso 50A charger unit. https://simplysplitcharge.co.uk/Abso-DMT1250-50amp-Kits?product_id=1070
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Why would you need an isolator? Even the most basic solar charge controller will notice the voltage from the alternator and consider the battery already charged. Most won't allow any sort of backflow to the panel.
skinny
grams
How will you charge your stuff? Or power your water pump. Or your laptop etc. I imagine you might do a few wfh days plus mtb. No fridge?
Put a 12v leisure battery and a charge off starter isn't expensive at all, couple hundred.
I have 500w of solar and 2 leisure batteries. Love that I'm 100% independent.
If it really is just a big estate, then I don't see why bother doing any conversion at all. Just treat it like a van.