I am currently debating on two different solar panels both are Semi-flexible monocrystalline panels. I plan on an MPPT controller. I have a 225 ah battery setup. I plan on using the 225ah battery for emergency home use, and a smaller system for camping. I was looking at attaching whichever panels I get to a light aluminum frame for transport and setup. for the 24 volt I was thinking of getting 2 panels running 300 watts at 24 volts and a 15amp MPPT. For the 12 volt I was thinking 2 or 3 panels running 240 or 360 watts at 12volts now with only 2 I can get by with a 15amp MPPT but 3 would push me up to 20amp. The 15amp mppt would cost around $50.00 which I like due to its rugged no screen and waterproof construction. the 20amp would be around $100.00. Looking at the numbers below I don't see that big of a difference in IPMAX 6A for 12volt vs 6.2A for the 24volt system. from what I have read the 24 volt system would give me the ability to run longer wires with thinner gauge. any other advantage for going 24 volt.(this is where I am leaning right now)
Specs of 12 volt panels are:
Cost $135 X2=$270 X3=$405
PMAX 120 watt
IPmax 6.0A
VPmax 20V
ISC 6.65A
VOC 22.8V
Specs of 24 Volt Panel
Cost $189 x2=$378
PMAX 150
IPMAX 6.2
VPMAX 24V
ISC 6.7 A
VOC 30V
Specs of 12 volt panels are:
Cost $135 X2=$270 X3=$405
PMAX 120 watt
IPmax 6.0A
VPmax 20V
ISC 6.65A
VOC 22.8V
Specs of 24 Volt Panel
Cost $189 x2=$378
PMAX 150
IPMAX 6.2
VPMAX 24V
ISC 6.7 A
VOC 30V