[RE-wrenches] Back-up from large grid-tie system.

[William Miller]

Kelly:

A big a** generator and a transfer switch.

William Miller

PS:  Seriously, I have seen projects like this and rarely is there a 
natural subdivision in the power distribution that allows one to back up a 
portion of the loads.  Backing up a huge power demand, which I assume this 
is, is best done by rotating machinery.

Wm



At 07:52 AM 2/1/2010, holtek at sbcglobal.net wrote:
>Project:
>43kw system originally designed as grid-tie. 208 3ph, 6 SB7000(208). 
>Equipment already rec'd.
>The curve ball.....client now wants some back-up capabilities that include 
>solar......there is a 7.92kw sub-array in the system that may be part of 
>the solution. Any thoughts?
>
>
>
>Holt E. Kelly
>Holtek Fireplace & Solar Products
>500 Jewell Dr.
>Waco TX. 76712
>254-751-9111
>www.holteksolar.com
>
>----- Original Message ----- From: "Peter Parrish" 
><peter.parrish at calsolareng.com>
>To: <re-wrenches at re-wrenches.org>
>Sent: Sunday, January 31, 2010 5:19 PM
>Subject: [RE-wrenches] Couple of Qustions about AGM batteries
>
>
>>We have put together a 850 Wdc portable stand-alone PV system. It uses a
>>Blue Sky 3024DiL charge controller, a pair of SunXtender 250 A-hr AGM
>>batteries (24 volt configuration), and a Xantrex Prosine 1000 inverter.
>>
>>We have been using this system for powering "events" and getting some good
>>marketing from the activities. Everything has worked out well, and the
>>system is not being used now and probably won't until March or April
>>sometime.
>>
>>We have let the system fully charge the batteries through bulk/absorption
>>and now float. The float conditions are 26.4 V and 2.0 A at a battery
>>temperature of 21 deg-C.
>>
>>My first question: is it alright to let the batteries float every day for
>>the next 6 to 8 weeks, or should I disconnect them from the rest of the
>>system until we are ready to use the system again?
>>
>>My second question: since the 3024iL can perform an equalization, is there a
>>safe equalization procedure for these AGM batteries?
>>
>>- Peter
>>
>>Peter T. Parrish, Ph.D., President
>>California Solar Engineering, Inc.
>>820 Cynthia Ave., Los Angeles, CA 90065
>>CA Lic. 854779, NABCEP Cert. 031806-26
>>peter.parrish at calsolareng.com
>>Ph 323-258-8883, Mobile 323-839-6108, Fax 323-258-8885
>>
>>
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Please note new e-mail address and domain:

William Miller
Miller Solar
Voice :805-438-5600
email: william at millersolar.com
http://millersolar.com
License No. C-10-773985
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