I assume that's 3.4 amps? Multiply by 12 volts and you're getting about 40 watts. But at this time of year in the UK, that's probably half what the panel is capable of.How do I know what wattage my solar panel is.
Without getting on the roof to investigate.
Full sun in the afternoon the most it reads on the over door meter 3.4
I did say 'roughly' Martin. If you can see the panel from a higher spot, it's easy to estimate it's size without climbing up the van.
Well ours is only about 50 x 50 80W because there are so many rooflights, I have 2x 130Ah batteries and it copes admirably. Mind you, to be fair we rarely stay more than 5 nights in one place, and that's at the show rallies with no hookup, but have never run out of power although we are careful, rarely use an inverter, don't carry a hair dryer, or a TV.40cms by 80cms of top of my head cannot check without getting on roof and i don't have a ladder with me.
Thinking of putting another panel up there when I get back as it's trying to charge two 100ah leisure batts plus engine battery.
The originals would have been Polycristaline the new ones Monocrystalline, you can see the difference in the cell structure.Inundated you can’t go my panel size, I changed the ones on my 2001 Hymer and the original one was 65watts and the new ones are 100watts and they are the same dimensions.