Advice wanted for solar/battery/charger in our new (2011) Jayco Swan

[Occasional_panner]

A common complaint is they "are simply crap on 12v" But if you inspect the wiring on them the cause is clear, they need to be supplied with a huge number of amps at 12v and most wiring isn't up to the task.

mine takes 7.1 amps on 12 volts , total madness considering it takes a tad over 5 on 240v running on the inverter.

Huh, that doesn't sound right, that's a big difference.
I can't remember what mine is on 12v, but it was a lot more than 7 amps.

7.1 amps x 12v=85.2 watts

5 amps x 240v=1200 watts (you must have had something else in the van running, that's waaaaayyyyy too high).

This is a handy little chart some might find useful.

 

[Jaros]

Yes that is a very handy chart-I sometimes forget the formulas as well. :Y: