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Oversizing strings on the inverter

  • 21-10-2022 1:53pm
    Registered Users Posts: 1,894 ✭✭✭

    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.


  • Moderators, Home & Garden Moderators Posts: 4,483 Mod ✭✭✭✭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

  • Registered Users Posts: 1,894 ✭✭✭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?

  • Registered Users Posts: 97 ✭✭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.

    Post edited by fael on

  • Moderators, Category Moderators, Motoring & Transport Moderators, Regional East Moderators Posts: 62,713 CMod ✭✭✭✭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)