MPPT or PWM Solar Charge Controller for High Voltage Solar Panels?



Your choice of PWM versus MPPT solar charge controllers is critical if you choose high voltage grid-tie solar panels for your RV. I have flexible grid-tie Unisolar panels on my RV and I upgraded to MPPT. Watch the video to learn why.

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MORE ABOUT THIS EPISODE
MPPT charge controllers operate more efficiently than PWM controllers, can be used with higher voltage panels, and are able to convert unused voltage to higher amperage. My panels output a higher voltage than standard RV solar panels. For this reason I needed to install a quality MPPT controller to take advantage of the higher voltage.

A PWM controller can also be used with higher voltage panels (20 volts and higher) as long as the voltage does not exceed the maximum input voltage of the controller. However, only a portion of the power from a high voltage solar array will pass through a PWM controller to your battery bank. So, if you have high voltage panels, an MPPT controller is recommended.

SOLAR PANEL WIRING TIPS – SERIES VS PARALLEL
If you have an MPPT charge controller and closely matched panels, then wiring them in series or parallel should yield the same result.

If you have a PWM charge controller, it will be better to wire your solar panels in parallel keeping in mind you may need thicker cable.

Finally, if you have mismatched panels, using an MPPT charge controller and wiring your panels in series will give you the best result.

SOLAR PANELS HAVE INSTALLED ON MY RV
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This video may also address these topics:
mppt vs pwm
mppt vs pwm test
mppt vs pwm charge controllers
mppt vs pwm controllers
Solar wiring series vs parallel

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The opinions expressed in our videos are our own or from a contributor. Before taking on any project or making a large purchase, we recommend you do your own research and consult a professional for advice. We are NOT liable for any damage to your RV or injury incurred as a result of following our tips, advice or instructions. We are not RV professionals or certified technicians. We are simply RV owners who work on our own RVs and have a desire to share what we learn with others. Be responsible and know your limits.

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Post time: Feb-12-2018
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