I have three 100ah AGM batteries in my campervan. I've used them for 2 years.
(also a 390w solar panel, victron mppt and battery monitor)
Recently, staying in Portugal with high temps, although I've reached 100% battery each day, by morning I'm at 75 or 80%. My fridge tries to start up, runs for a few seconds then stops. When this happens, it takes my batteries from 12.17V to 10.99.
When there's enough light on my solar panel the fridge runs fine.
Being agm batteries, I can use 50% of their capacity. Its frustrating to be at 80% but still not have a working fridge!
Would new batteries help? I don't recall having this problem before, so I'm guessing they just aren't holding their charge as well as before.
