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tomio asked

Smart Solar MPPT 150/100 (max voltage 151v)

I have a Smart Solar MPPT 150/100 and three each of the 415W solar panels. Now the panel has a rating of 50.41VOC, so does that mean connecting these 3 panels in Series is out of the question? three of these will make 151.23V which is obviously over 150V ? I'd like to keep these panel voltages as high as possible. The output will be 24V.

I have another setup using these same panels, where I have 6 of them on a MPPT 150/100. With this one I have 2 panels each in Series and 3 Parallels. I've used this system since summer of 2022 and the voltages never exceeded 99V. I'm in Japan and the temperature hovers around 0 degrees Celsius. Maybe the lowest it has got in my experience was -5.

Is it better not to take a chance and connect 3 of these in series? Do the 150/100 have a little leeway in terms of the max voltage. Is my only choice to go with the MPPT 250/75?

Appreciate your input.

415w-solar.jpg

MPPT ControllersMPPT SmartSolar
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1 Answer
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kevgermany answered ·

There are two safe ways to do this

Three panels in parallel

Use a controller with a higher input voltage and connect the panels in series.

VOC of the panels is usually at 25C. It increases as temperature drops. Connecting as you're thinking will almost certainly damage your controller and would not be covered by warranty.

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Related Resources

MPPT Product Page

MPPT Error codes

MPPT 150/60 up to 250/70 Manual

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