MPPT sizing for 3x400w Sunpower panels

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Daniel Leone asked Jun 13, '21

MPPT sizing for 3x400w Sunpower panels

Hi all,

I'm building an off-grid 24v system. I've chosen 3 of the Sunpower 400w panels.

Using the online calculator, it's recommending the 150/45 MPPT.

But I don't know why it's not recommending the 100/50 - as it seems like a better and cheaper option? (better because of the higher amp rating)

Here's the calculator link:

https://mppt.victronenergy.com#djE7Y3VzdG9tLDEsMywzNiwtMTAsNzAsMjQsNiwwLDYuNTgsNDAwLDY1LjgsLTAuMjMsNzUuNiw2LDY=

And here's the panel specs:

I've also tried the older excel version of the calculator, and it also seems to suggest the 100/50 would be better I think, because of the higher amperage.

I've planned to put all the panels in parallel because of the high Voc and low Isc. Am I missing something else here, or does the calculator just not know about the 100/50?

Any help is greatly appreciated,

Dan

MPPT Controllers solar sizing

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Answer 1 · 2021-06-13T10:14:57Z

wkirby answered · Jun 13, 2021 at 10:14 AM

The 100/50 would be an excellent choice for your configuration.

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Daniel Leone commented · Jun 13, 2021 at 03:43 PM

Roger that boss! Thanks for the quick answer. Much appreciated

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