mppt vs pwm

jrnymn7 wrote:
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.

Couldn't the output of all four panels be parallel connected and three of these 20A controllers run with parallel inputs?

This would put the cost closer to $300 verses $450 for a 60A single unit.

I don't ever expect 100% efficiency and will be happy with half. I live in an area that is overcast more than sun.