question

luk3337 avatar image
luk3337 asked

pv configurations for mppt 150/100

Hi.
I have 12 panels 285w data vmp 32.2v imp 8.86a voc 39.3v isc 9.31a how best connect them to victron smartsolar mppt 150/100 mc4. i have 48v battery. I'd like connected them in 4 strings of 3 making the string sum of the voltage 120V and the current just under 40A. Will it work on one mc4.
I would appreciate any hints. LUK


MPPT ControllersVEConfigure 3Solar Panel
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
JohnC avatar image
JohnC answered ·

Hi @luk3337

It might still 'work', but the current rating for MC4 connectors is 30A. Best to run 2 pairs. Standard MC4's are designed to fit 'solar wire' of up to 6mm2, and that's what I'd use.

4 comments
2 |3000

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

Ok,

what if i had used a Y cable and connected the string to two mc4. as I understand it, I would not exceed the limit of 30 A per one mc4.

0 Likes 0 ·
Will the cable Y help to connect to the controller correctly? Unfortunately I can't make a second line. Please help.
0 Likes 0 ·
@luk3337

You could do this to satisfy standards for the mppt, but if you're running inadequate wire from the panels then you still have a safety issue. We don't know what you have there so can't really advise. Please *take care*..

0 Likes 0 ·
Thank you for your answer. It will give me some hope. I have a 6mm2 cable between the panels and the controller, so I think it will be enough?
0 Likes 0 ·