Re: Portable Solar Panel Setup
The C40 is over-kill, as one 130 Watt panel will never come close to 40 Amps @ 12 Volts. 8 Amps maybe.
But, $50? What's wrong with it? That is a suspiciously low price for C40 - about 1/3.
Are you planning on adding more panels in the future? It would certainly allow.
There's shouldn't be any trouble with the two charging systems hooked together on one battery set, except that while in storage the C40 may drain off some current (won't provide any without sun on the panel of course). Simply disconnect it while the trailer is out of use.
It's a good plan. Make sure whatever mounting rack you build for the panel is adjustable and sturdy. You don't want it knocked over by wind or some such while you're happy camping!
Four 175 Watt panels, OB MX60, 232 Amp hrs, OB 3524, Honda eu2000.
Ohm's Law: Amps = Volts / Ohms
Power Formula: Watts = Volts * Amps