Cannot find inverter for my panels

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  • AndyS
    Junior Member
    • Mar 2025
    • 6

    #1

    Cannot find inverter for my panels

    I have an existing solar system: 28 panels (2 strings 6 + 22) and a 10 kW 3-phase grid-tied inverter. I want to replace the inverter with a hybrid one to connect a battery, but do not want to touch the panels. I'm struggling to find a 10 kW 3-phase hybrid inverter that will support the input DC current coming from the panels. Looking at historical data, one string peaks at 16 A and the other at 27 A. My current grid-tied inverter easily handles that as it supports 32 A per MPPT. Most 10 kW 3-phase hybrid inverter I'm finding are 16 A per MPPT or a bit more, but none can handle (16 A or more) / (27 A or more).

    My questions are:

    1. Is there an inverter out there that would meet my requirements?

    2. What will happen if I connect an inverter that cannot handle the current? Will it just clip the panels' output? Or will it burn out?
  • littleharbor2
    Solar Fanatic
    • Jan 2016
    • 226

    #2
    It sounds like you're unsure about the configuration of your solar array no single string would be 27 amps that's combined strings for sure so you will definitely need to rewire and concentrate more on the voltage to meet the requirements of the inverter individual panels and individual strings probably would max out no more than about 12AMPS with the large format panels these days look and see if there's a combiner box on your roof or somewhere in the system and find somebody who knows PV system wiring to help you figure it out.
    2 Kw PV Classic 200, Trace SW 4024 460ah,

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    • AndyS
      Junior Member
      • Mar 2025
      • 6

      #3
      Hi littleharbor2, thank you very much for your reply.

      My inverter supports 2 MPPTs, 2 strings per MPPT. On the below image you can see that only one of the two strings per MPPT is connected:

      image.png
      Unless two strings are connected somewhere at the roof and then come to the inverter as one pair of wires? Is it possible?

      Rather than strings, let's look at MPPTs. On the below graph you can see that they both can go over 16 A. For MPPT1 it's a very rare case so 16 A is a maximum, while MPPT2 goes above 24 A on the graph and generally peaks at 27 A. No matter how I rewire, wouldn't I need more than 16 A on each MPPT anyway?

      image.png

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      • littleharbor2
        Solar Fanatic
        • Jan 2016
        • 226

        #4
        Grid tie and three phase is not really in my field of expertise. I'm curious though what model and brand is your three phase grid tie inverter? Interesting looking input terminals

        2 Kw PV Classic 200, Trace SW 4024 460ah,

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