question

Daniel Leone avatar image

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:

1623576864181.png

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.

1623576910963.png1623576890476.png


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 Controllerssolar sizing
1623576864181.png (75.3 KiB)
1623576890476.png (181.9 KiB)
1623576910963.png (175.3 KiB)
2 |3000

Up to 8 attachments (including images) can be used with a maximum of 190.8 MiB each and 286.6 MiB total.

1 Answer
wkirby avatar image
wkirby answered ·

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

1 comment
2 |3000

Up to 8 attachments (including images) can be used with a maximum of 190.8 MiB each and 286.6 MiB total.

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