mppt vs pwm

Bedlam wrote:
I was thinking about ganging two of these controllers together (one per pair of panels) for about $205 total cost:

http://www.eco-worthy.com/catalog/mppt-solar-charge-controller-free-shipping-p-182.html

300w input = 300w output

If your bank is at 50% soc, the controller will start out at about 23 amps @ 13 volts. Even at a 14.4v setpoint, the controller will still be maxxed out. So, no, two eco-worthy 20 ampers will not do.