slightly different solar qx
Am looking at solar on a small class A. I currently have 3 group 27 batteries (rv/marine) for the house. (prior owners had just installed 2 new, and I had one from a trolling motor setup) they will...
Forum Discussion
Reality check for PWM usage: About 10% of the panel watts are also lost because the higher voltage is NOT used. The linked panel above has Isc of 5.72A and with a battery charging voltage of 14.4V the power loss is also about 10%.
Below 25C panel power increases while Isc declines favoring MPPT.
Truthfully nothing beats installing an extra panel and just enjoying the camping experience without stressing over these power and voltage variations.
3 other factors that I considered and still apply today:
1. Panel cost per watt is much less for 24V panels (both 60 and 72 cell) than 12V panels.
2. For equivalent panel watts the square footage of 24V panels is less that 12V panels.
3. A larger panel array of 12V panels didn't fit as well on my roof.
Below 25C panel power increases while Isc declines favoring MPPT.
Truthfully nothing beats installing an extra panel and just enjoying the camping experience without stressing over these power and voltage variations.
3 other factors that I considered and still apply today:
1. Panel cost per watt is much less for 24V panels (both 60 and 72 cell) than 12V panels.
2. For equivalent panel watts the square footage of 24V panels is less that 12V panels.
3. A larger panel array of 12V panels didn't fit as well on my roof.
