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Disconnects and inverter locations

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  • nwdiver
    replied
    Originally posted by telero View Post

    This would be a 12kW solar, ideally line side tap. Pretty sure I'd need a 60A disconnect.
    60A 2 pole disconnects are pretty cheap and easy to find. It's the 100A and higher where they get spendy. The disconnect size is based on the inverter capacity not the panels. I would just pair a 11.4kW inverter (48A) with a 60A disconnect.

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  • solarix
    replied
    Having a disconnect within sight (50' max) of the inverter is in the code, but AHJs around here never have required it when the inverter is inside the house. Our utility has always required a lockout AC disconnect on the outside near the service, but no one does a second one. I suppose the 2020 code is going to solve another non-existent problem...

    Be aware that some AHJ's don't go for SQ-D DU222RB disconnect because the fine print on the label says that it is only listed for use with overcurrent protection fuses and not breakers. Best to use an Eaton DG222URB

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  • telero
    replied
    Originally posted by Mike90250 View Post
    That's going to depend a lot on what your local inspector wants to see.
    I figured that would be a part of it. Mostly wanting to make sure it's actually practical and technically correct.




    Originally posted by nwdiver View Post

    Every AHJ I've dealt with requires a 'visible' and 'lockable' AC disconnect. You need to be able to open the disconnect and visibly confirm the circuit is broken so a breaker or switch won't work. Something like a square D 'DU221RB' should work.
    Good point. I was thinking about a lockable AC disconnect like you mentioned for the full service disconnect, but I wonder if that would be practical or cost efficient. I hadn't searched for pricing on something that large (compared to the 30A model you mentioned). This would be a 12kW solar, ideally line side tap. Pretty sure I'd need a 60A disconnect. For a whole home disconnect would that mean I'd need a disconnect of at least 260A? Seem like one large enough to handle that wouldn't be worth it for cost. A couple of smaller disconnects (one outside, one inside) for the inverter only will probably be better. Trying to keep everything as clean/tidy as possible. Ideally all conduit will be in-wall. We don't have NEC 2020 (yet), and I'm not sure how that's going to be handled around here. Typically I don't see combination panels or any sort of outdoor panels. Not sure if that's local code/regulation or PoCo requirements.

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  • nwdiver
    replied
    Originally posted by telero View Post
    It's my understanding that for solar there needs to be an outside disconnect available to cut power to the inverter, and that if the inverter is located inside there would also need to be another disconnect there. With NEC 2020 requiring a full service disconnect outside, I'm curious if that would satisfy the outside inverter disconnect requirement as well?
    Every AHJ I've dealt with requires a 'visible' and 'lockable' AC disconnect. You need to be able to open the disconnect and visibly confirm the circuit is broken so a breaker or switch won't work. Something like a square D 'DU221RB' should work.

    Leave a comment:


  • Mike90250
    replied
    That's going to depend a lot on what your local inspector wants to see.

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  • telero
    started a topic Disconnects and inverter locations

    Disconnects and inverter locations

    It's my understanding that for solar there needs to be an outside disconnect available to cut power to the inverter, and that if the inverter is located inside there would also need to be another disconnect there. With NEC 2020 requiring a full service disconnect outside, I'm curious if that would satisfy the outside inverter disconnect requirement as well?
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