[RE-wrenches] Utility inverter rating

Dave Click daveclick at fsec.ucf.edu
Thu Oct 18 11:56:16 PDT 2012


Erika, I think the takeaway here is that the Island only has that surge 
power capacity on the protected load side- you wouldn't see this surge 
on the utility side. SMA should be able to provide this sort of 
documentation for you.

On 2012/10/18 9:38, Erika Weliczko wrote:
> Greetings all.
>
> I recently received this back regarding an interconnection application
> proposing a Sunny Island 6048 and a SB7000:
>
> “we have to rate the system at the max output of the inverters, and
> since that battery backup has an inverter that can export 11kW, (albeit
> for 3 seconds) I have to review the system for a total of 18kW.”
>
> This is a new one on me. I might argue that the SB7000 is upstream of
> the SI6048 and really the SI6048 is the point of interconnection, so the
> SB7000 is irrelevant. And 3 seconds is not really continuous operation.
>
> It seems that batteryless inverters show continuous output ratings,
> though I know there are some that specify a larger than expected OCP for
> various reasons, but that is not what the utility cares about.
>
> Any insights here?
>
> Thanks,
>
> Erika
>
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