[RE-wrenches] Combining Multiple Inverters

[Dave Click]

Corey,

The line of reasoning is faulty. It's 705.12(D)(1). Micro-inverters are 
the exception because they are specially listed to share a breaker. As 
for the other inverters, doubling them up on a single breaker / 
disconnect probably goes against their installation instructions 
[110.3(B)] and it's unlikely that you could put multiple units on a 
single breaker anyway because when you take (2 inverters) x (rated 
current) x (1.25) you will probably come up with a minimum breaker size 
that is larger than the maximum allowed under the NRTL listing to UL 1741.

Dave



On 2014/6/26, 16:18, Corey Shalanski wrote:
> We considered the necessity to shut down individual inverters and 
> determined that the added costs of an inverter output combiner panel 
> were not merited. I agree that in theory it seems beneficial to be 
> able to switch each inverter individually, but how often does this 
> occur in practice? For the relatively infrequent cases where we need 
> to return to a jobsite and shut down an inverter - for 
> troubleshooting/removal/etc. - we do not mind shutting down the other 
> inverters (up to a limit) for what is hopefully a short period of time.
>
> Again, this whole line of reasoning may be shown to be faulty if 
> someone can directly point to the Code section that requires OCPD on 
> each individual inverter.
>
> --
> Corey
> ?
>
>
> On Thu, Jun 26, 2014 at 9:20 AM, 
> <re-wrenches-request at lists.re-wrenches.org 
> <mailto:re-wrenches-request at lists.re-wrenches.org>> wrote:
>
>
>     Message: 5
>     Date: Wed, 25 Jun 2014 19:17:57 -0700
>     From: William Miller <william at millersolar.com
>     <mailto:william at millersolar.com>>
>     To: RE-wrenches <re-wrenches at lists.re-wrenches.org
>     <mailto:re-wrenches at lists.re-wrenches.org>>
>     Subject: Re: [RE-wrenches] Combining Multiple Inverters
>     Message-ID: <04F4B8FD-E280-4BF2-B5A4-C2FCA8D1C7A6 at millersolar.com
>     <mailto:04F4B8FD-E280-4BF2-B5A4-C2FCA8D1C7A6 at millersolar.com>>
>     Content-Type: text/plain; charset="utf-8"
>
>     Not allowed. You need a dedicated OCPD. Plus seems like a really
>     bad idea.  How do you shut down just one inverter?
>
>
>
>     Miller Solar
>
>
>
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