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?
I run two of these Cynergy 140 watt panels with a Morningstar Tristar 45 controller. Mine are mounted fixed and flat on the TT roof, although each are at slightly different angles from parallel to the ground based on the curved shape of the roof. On a bright sunny day during bulk charging I can see the claimed max amps for a total of 15-16 amps.
When I started I was strictly 12V as well. Then I realized that I'm harvesting free power from the sky and I ended up with an inverter and a fixation on what 120V AC gadgets I can also run. So despite the initial intentions, things may change once you realize what you have available.
