For those of you who read my blog for a while it won’t be a surprise when I write that I own a Volkswagen Vanagon Camper (RV) and spend some time camping in it each summer.

This year I had my first fully off-grid holiday. Last year I connected the camper to the mains on the campsites I wisited, while this year I didn’t and relied entirely on energy captured by my solar photovoltaic panels and stored in my two gel batteries.

The batteries have total capacity of around 80 Ah (ampere-hours) which is roughly 900 kWh (kilowatt-hours). That’s more than enough for my laptop computer, some chargers, water pump. Even lighting in my camper (two fluorescent bulbs) would get enough power if I finally connected them to the camping batteries (at the moment they suck power from the starter battery). (more…)