[RE-wrenches] Multiple inverters

[Christopher Warfel]

Just reading more slowly, each inverter has to be on its on separate 
disconnect means. You cannot put multiple inverters on the same 
disconnecting means unless there are individual disconnecting means 
upstream.

On 2/25/2019 10:53 AM, William Miller wrote:
>
> Friends:
>
> I have an NEC code question on an upcoming project.  It is a home that 
> has an existing 8 kW ground-mounted grid-tied system.  The owner wants 
> to add another 10 kW of grid-tied PV.  My question is about 705.12, 
> point of connection. Specifically section (D)(1).  That section states:
>
> /The source interconnection of one or more inverters installed in one 
> system shall be made at a dedicated circuit breaker or fusible 
> disconnecting means./
>
> So if there are going to be two inverters on premise, do the outputs 
> have to be aggregated to connect via one circuit breaker?  This might 
> be difficult to do as the exiting inverter is connected via a 
> different sub-panel than the one that is planned to receive the new 
> inverter output.
>
> This article 
> <https://iaeimagazine.org/magazine/2014/01/16/load-side-pv-connections/> 
> addresses the question.
>
> I would be very grateful if any of you can share any experience you 
> might have in interpreting this section of the code.
>
> Thanks in advance.
>
> William
>
>
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-- 
             Christopher Warfel
                      ENTECH Engineering, Inc.
PO Box 871, Block Island, RI 02807
                                 401-466-8978
<http://entech-engineering.com>


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