Re: [RE-wrenches] Utility inverter rating

[Allan Sindelar]

Erika, This just came up for us recently. I learned this, surprisingly, from a Customer Generation tech at our local utility. We are installing a GTWB system with two SI5048s and two SB5000s. The CG tech spoke with SMA tech support about the possibility of the SIs selling back to the utility as well as the SBs. He learned that there is a software patch that can be installed in the SIs that will allow them to do this, but that SMA will only allow the patch to be installed upon receiving written permission from the utility. This was sufficient for our utility to consider our system to be a 10kW interconnected system. This is all I know that may help you; I heard nothing about "3 seconds". You might want to explore this further with SMA tech support. Allan Allan Sindelar al...@positiveenergysolar.com NABCEP Certified Photovoltaic Installer NABCEP Certified Technical Sales Professional New Mexico EE98J Journeyman Electrician Founder and Chief Technology Officer Positive Energy, Inc. 3209 Richards Lane (note new address) Santa Fe, New Mexico 87507 505 424-1112 www.positiveenergysolar.com On 10/18/2012 7:38 AM, 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   REpower SOLUTIONS www.repowersolutions.com P: 216.268.2275 C: 216.402.4458   _______________________________________________ List sponsored by Home Power magazine List Address: RE-wrenches@lists.re-wrenches.org Options & settings: http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org List-Archive: http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org List rules & etiquette: www.re-wrenches.org/etiquette.htm Check out participant bios: www.members.re-wrenches.org

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