[RE-wrenches] Battery based grid tie question.

[William Miller]

Ken:

I guess I'm overly optimistic in hoping that electrical engineers could 
understand these concepts.  Next time I'm sending in a modified drawing 
without the genset.

William


At 04:47 AM 3/26/2009, you wrote:
>Morning William,
>
>
>
>As for 2, from our experience with the local IOU, be careful when 
>mentioning a motor-driven generator. They don't understand that the XW 
>can't sell that power--directly-- to the grid. Since the cat is out of the 
>bag, I think you'll need to show that the gen set only charges the battery 
>and passes thru the XW to the dedicated loads.
>
>May be simpler not to mention generator?
>
>Ken
>----- Original Message -----
>From: <mailto:william at millersolar.com>William Miller
>To: <mailto:re-wrenches at lists.re-wrenches.org>RE-wrenches
>Sent: Thursday, March 26, 2009 2:12 AM
>Subject: Re: [RE-wrenches] Battery based grid tie question.
>
>Colleagues:
>
>Interesting that this topic comes up at this time:
>
>1. We inherited a grid-tie project wherein an elderly client was sold an 
>SW installation some years ago.  Come to find out, the installer never 
>filed anything with the utility.  The client was caught recently 
>back-feeding without permission by a meter reader and told to cease and 
>desist.  We filed an application with the utility thinking this was a long 
>shot since the client's SW inverter did not have the requisite Grid-tie 
>Interface (GTI).  We have several GTIs sitting on the shelf, but the 
>inverter does not have the proper interface so one could not be 
>installed.  Lo and behold, the utility approved this installation for 
>interconnection.
>
>2. We have an application to the local utility (PG&E) pending for a three 
>XW installation with a motor-generator.  We have received multiple 
>communications from PG&E doubting the acceptability of the XW system for 
>use as a gird-tied battery-back up system.  We are hoping that PG&E 
>accepts the listings from the various agencies and approves the project.
>
>Interesting that the old, non-complaint system receives swift approval but 
>the latest and greatest gear hits a regulatory road block!  We'll keep you 
>posted.
>
>William Miller
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