Input voltage Mono PERC half cell for the MPPT

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marlon-acevedo-rios asked Jan 16, '21

Input voltage Mono PERC half cell for the MPPT

Dear all,

I will install a PV system in a very hot and high humidity place in the Amazon region in Colombia. We are planning to use a MONO PERC half cell PV module with Voc= 49,3V (Longi LR4-72HPH-450M). I would like to know if any of you have experience with this type of PV modules in a hot place. My main concern is to damage the MPPT going beyond its maximum voltage input.

If my array has 3 modules in series, I will get 147,9V but I am above the Maximum PV open circuit voltage from the datasheet: 145V start-up and operating maximum. However, knowing that the installation will be in a very hot place, the voltage will drop a bite.

From the configuration spreadsheet, I found that my limit temperature is 20°C. Below it (e.g. 19°C) I will damage the MPPT.

I think that it could be better to have 2 PV modules in series, in order to be completely sure about voltage limits; but I would like to hear from you guys: what do you think/suggest?

Thanks in advance,

MPPT Controllers voltage

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Answer 1 · 2021-01-16T12:14:58Z

klim8skeptic answered · Jan 16, 2021 at 12:14 PM

It is best to stick with real world figures.

Maybe I have the wrong Columbia weather stats..

bogota-columbia-weather.png (107.6 KiB)

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Answer 2 · 2021-01-16T12:32:33Z

marlon-acevedo-rios answered · Jan 16, 2021 at 12:32 PM

Thank you!

Yes, in fact, that is Bogotá, but in the Amazon, the temperatures are like this:

In theory, I could do it, but I am not completely sure about it.

What do you think?

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klim8skeptic ♦ commented · Jan 16, 2021 at 12:52 PM

I live half a globe away, but lived somewhere properly tropical for 30 years...

I am not local but goggle shows different stats to what you present.

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bogota-columbia-weather-a.png (41.7 KiB)

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