[RE-wrenches] Combining Multiple Inverters

[Jay Peltz]

I have never seen an inverter that does not specify a OCPD size. 

Jay
Peltz power. 

Sent from my iPhone

> On Jun 26, 2014, at 3:20 PM, Dave Click <daveclick at fsec.ucf.edu> wrote:
> 
> 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
>> ᐧ
>> 
>> 
>>> On Thu, Jun 26, 2014 at 9:20 AM, <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>
>>> To: RE-wrenches <re-wrenches at lists.re-wrenches.org>
>>> Subject: Re: [RE-wrenches] Combining Multiple Inverters
>>> Message-ID: <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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