Oversizing strings on the inverter

SD_DRACULA

I think this needs its own thread.

Question for anyone that oversized the panels on their inverter (Solis 6kw hybrid here). I think I have seen people go up to 9kwp on the two strings.

Any issues with that in the good months, looking at possibly doing 4500w from 11 panels of 405w, not worried about voltage as that's around 400 ish so it should be ok no matter the weather but it does say to only go up to 4000w per string on this inverter.

I have a string of 4000w x 12 panels, and one of 3000w of 9 panels currently connected and looking to swap out the 3000w string for 4500w.

graememk

8.6 on 6kw, NE/SW

No issue, just clips in may/June

July/Aug is too warm, max out at 5-5.5kw

SD_DRACULA

That's what I thought, thanks.

How are they split 4.3/4.3? How many panels per string? Never got got any high voltage errors?

fael

I have 8.1 kW evenly split on a Solis 6kW hybrid.

Does a consistent 6.2/6.3 on the sunny days in the summer. Never got any errors.

Interestingly it can do 8kW+ for short bursts, but only when it's cool outside. Normally happens when a cloud blocks the sun for a while.

unkel

It's no problem at all. The only thing you have to make sure of is that the total open circuit voltage of the panels doesn't exceed the max input voltage on the inverter. This voltage is higher, the colder it gets (get's highest at about -20C)

samdeluxjones

Well, did you get your oversizing done and how did you get on?

unkel

https://www.boards.ie/discussion/comment/123009293#Comment_123009293

He oversized his inverter in the end. Twice. 😂