PWM and MPPT charge controller on same solar panels
And after several months, given that there was no conclusive answer, I took advantage of the good weather and I tried.
As soon as the solar panel was connected to both the MPPT and the PWM controller, the MPPT controller started making strange noises. Needless to say that's a bad sign, so I disconnected the PWM controller.
It &quot;may&quot; work on other models, but I'm inclined to say it's not a safe option regardless.
Bottomline, the short answer is: No, it's not a sensible setup. Don't do it.