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,
<[email protected]
<mailto:[email protected]>> wrote:
Message: 5
Date: Wed, 25 Jun 2014 19:17:57 -0700
From: William Miller <[email protected]
<mailto:[email protected]>>
To: RE-wrenches <[email protected]
<mailto:[email protected]>>
Subject: Re: [RE-wrenches] Combining Multiple Inverters
Message-ID: <[email protected]
<mailto:[email protected]>>
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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