rtate wrote:
Salvo wrote:
I would avoid mppt if you want to do it cheap.
Get two 12V, 140W panels for $160. The pwm controller costs about $30.
https://www.solarblvd.com/product_info.php?cPath=1_269&products_id=2668
I really dont understand much about solar charging or electricity for that matter.
Would that mean that theoretically these panels would be capable of putting 23.3 amp hours into my batteries? 2×140 watts÷12 volts =23.3 amps.
As a practical matter how many amp hours could you expect to add to your battery bank on an average day?
Click the link and look for Isc specification. I= current (amps) sc= short circuit. Spec is 8.4 so the most you will see with a PWM controller is 2x 8.4 or 16.8 amps. You could spend an extra $200 on MPPT and get maybe 20 amps... might be less money to just get a 3rd panel.
