No power to the garage unfortunately. After just four days parked, there is insufficient charge to start the engine but lights and boot release still work.
Flicked the isolator switch on today - hopefully, that should preserve the battery charge.
When my boat was on a swinging mooring with obviously no mains connection, I used a 35W solar panel to keep 3x90aH batteries fully charged, and even to re-charge if the boat was left with batteries half down. Worked perfectly and solar panel;s arent that costly these days. And yes, they do work in the UK in winter with clouds around.
Likely all you would need is a 10w panel at maybe £20, but it depends on how big the battery drain is
