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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 (...
red31's avatar
red31
Explorer
Sep 14, 2016
mike-s wrote:
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.


well the OP is asking about mppt (parallel vs series), charts in manuals show the difference and how the performance varies over a range of power input.

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