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ewarnerusa's avatar
ewarnerusa
Nomad
Sep 13, 2016

SOLAR - Switch from PWM to MPPT, series vs parallel matter?

I put together a solar setup on our TT when we bought it new. I went with 2 x 140 watt 12V nominal panels in parallel and a PWM controller. Panel specs: Max Power: 140Wp Open Circuit Voltage (...
mike-s's avatar
mike-s
Explorer II
Sep 13, 2016
red31 wrote:
look at the efficiency curves near the end of whatever controller ya might get.

higher input v (series) yields a lower efficiency.
That's only MPPT. For a PWM controller the limit on controller efficiency is the Rds(on) of whatever MOSFET they chose to use.

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