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  • 2 Inverter Wiring

    I have a 14kw system that I am going to be installing next month. It has 2 SE7600 inverters that will be splitting the load evenly. My question is on the way to wire them into the main panel. I have seen on here in another post that it was recommended to wire them into a combiner box, A/C disconnect and into the main panel.

    I was originally told to wire them each to their own A/C disconnect and then into their own 40amp breaker on the main panel, basically treating them as 2 separate systems. Is this way possible to do?

  • #2
    You will end up doing what your local code inspector wants you to do.

    My question to you is - Have you received approval from your Power Company (PoCo) to attach that large of an install ? That's a fair bit larger than the usual 10kw consumer limit.
    You must have a 400A main panel to be able to cram that much power through it. I hope you did all the engineering before you bought parts.
    Powerfab top of pole PV mount (2) | Listeroid 6/1 w/st5 gen head | XW6048 inverter/chgr | Iota 48V/15A charger | Morningstar 60A MPPT | 48V, 800A NiFe Battery (in series)| 15, Evergreen 205w "12V" PV array on pole | Midnight ePanel | Grundfos 10 SO5-9 with 3 wire Franklin Electric motor (1/2hp 240V 1ph ) on a timer for 3 hr noontime run - Runs off PV ||
    || Midnight Classic 200 | 10, Evergreen 200w in a 160VOC array ||
    || VEC1093 12V Charger | Maha C401 aa/aaa Charger | SureSine | Sunsaver MPPT 15A

    solar: http://tinyurl.com/LMR-Solar
    gen: http://tinyurl.com/LMR-Lister

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    • #3
      I have already talked with the poco and they just require a 1 mill general liability policy, which I already have.

      These inverters will produce at max 32 amps each so a 400 amp panel seems a little overkill to me. I am going to upgrade my panel to 200amps and derate back down to my current 150 amps to provide the necessary room.

      I understand the inspector and county have the final say. I am trying to use the knowledge base here to verify the information I was told by someone in the field. I have searched the posts here for a couple of hours and have not seen if this way would be ok/safe, I figured I would ask.

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      • #4
        Your install is larger than most, and so I can ask questions, but you should ask the inspector what he likes to see in his jurisdiction, as he has the final say. Knowing which code cycle your city is using (2004, 2017, ...) is a good starting point
        Powerfab top of pole PV mount (2) | Listeroid 6/1 w/st5 gen head | XW6048 inverter/chgr | Iota 48V/15A charger | Morningstar 60A MPPT | 48V, 800A NiFe Battery (in series)| 15, Evergreen 205w "12V" PV array on pole | Midnight ePanel | Grundfos 10 SO5-9 with 3 wire Franklin Electric motor (1/2hp 240V 1ph ) on a timer for 3 hr noontime run - Runs off PV ||
        || Midnight Classic 200 | 10, Evergreen 200w in a 160VOC array ||
        || VEC1093 12V Charger | Maha C401 aa/aaa Charger | SureSine | Sunsaver MPPT 15A

        solar: http://tinyurl.com/LMR-Solar
        gen: http://tinyurl.com/LMR-Lister

        Comment


        • #5
          Originally posted by willt839 View Post

          These inverters will produce at max 32 amps each so a 400 amp panel seems a little overkill to me. I am going to upgrade my panel to 200amps and derate back down to my current 150 amps to provide the necessary room.

          I understand the inspector and county have the final say. I am trying to use the knowledge base here to verify the information I was told by someone in the field. I have searched the posts here for a couple of hours and have not seen if this way would be ok/safe, I figured I would ask.
          It doesn't matter what it puts out it matters the fuse size which is 40A per inverter.
          so you will have 80a feed in. That can not be tapped into a 200a MSP (Main Service Panel) as you have a 120% rule on feed in. You could derate it but that is a lot of derating.
          The main way to do it is with a 400a MSP or a line side tap. both are more expensive.

          In most locations you need to have a SINGLE interconnect, AC disconnect etc. This means you would need an AC combiner, for the two inverters.

          You other option is to use a single SE11400a inverter which can easily handle the array.

          OutBack FP1 w/ CS6P-250P http://bit.ly/1Sg5VNH

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          • #6
            Use a line side tap. You won't have to deal with the 120% rule on your "main" panel, but you will on the new panel you feed from the tap. It's more costly, but not by a ton. You'd need a new panel, likely outdoors, the wire, and the taps which can be insulation piercing connectors (IPCs). This is how my solar is setup, but with a 13kW array, and two SE6000Hs.
            https://pvoutput.org/list.jsp?sid=54099

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