I second Mick's appraisal here. I have clients that need 24/7 for computer but for only a few lighter loads and this has worked out well. They had frequent outages and very dirty power. They had lost a number of pieces of equipment to the surges. We used Outback with AGM batteries and a grid tie feed and they are very pleased.
Dana Orzel Great Solar Works, Inc www.solarwork.com E - d...@solarwork.com V - 970.626.5253 F - 970.626.4140 C - 970.209.4076 I will be the shift in how the world uses power! - Dana Orzel From: re-wrenches-boun...@lists.re-wrenches.org [mailto:re-wrenches-boun...@lists.re-wrenches.org] On Behalf Of Mick Abraham Sent: Monday, February 01, 2010 4:30 PM To: RE-wrenches Subject: Re: [RE-wrenches] Back-up from large grid-tie system. Hello, Holt et al~ If the client only expects 24 hour autonomy, you could build/supply an "uninterruptible power supply" for the police loads only, with no solar recharge dedicated to that system. This would involve inverter/chargers, appropriate safety gear & some monitoring, and a battery bank big enough to carry those loads for the requested 24 hours...and no PV array. When the grid comes back up, that will drive recharge of the battery. If the client had requested, say, seven days of system autonomy that might point back to connecting up PV to the system, but for 24 hours of ride-through I think it's all about the battery...or the generator system with auto transfer switch per William's suggestion. Jolliness, Mick Abraham, Proprietor www.abrahamsolar.com Voice: 970-731-4675 On Mon, Feb 1, 2010 at 1:42 PM, <hol...@sbcglobal.net> wrote: William, I would agree with generator only if there was the load demand. One thing I failed to mention is that this will be back-up for lights and communication for the campus police w/ 24hr autonomy. It looks as though the Sunny Island route is the most practical at this stage, but I am open for other suggestions. Holt E. Kelly Holtek Fireplace & Solar Products 500 Jewell Dr. Waco TX. 76712 254-751-9111 www.holteksolar.com ----- Original Message ----- From: William Miller <mailto:will...@millersolar.com> To: RE-wrenches <mailto:re-wrenches@lists.re-wrenches.org> Cc: RE-wrenches <mailto:re-wrenches@lists.re-wrenches.org> Sent: Monday, February 01, 2010 12:18 PM Subject: Re: [RE-wrenches] Back-up from large grid-tie system. 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, hol...@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 <http://www.holteksolar.com/> ----- Original Message ----- From: "Peter Parrish" <peter.parr...@calsolareng.com> To: <re-wrenc...@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.parr...@calsolareng.com Ph 323-258-8883, Mobile 323-839-6108, Fax 323-258-8885 _______________________________________________ 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 <http://www.members.re-wrenches.org/> _______________________________________________ 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 <http://www.members.re-wrenches.org/> No virus found in this incoming message. Checked by AVG - www.avg.com <http://www.avg.com/> Version: 9.0.733 / Virus Database: 271.1.1/2660 - Release Date: 01/31/10 11:35:00 Please note new e-mail address and domain: William Miller Miller Solar Voice :805-438-5600 email: will...@millersolar.com http://millersolar.com <http://millersolar.com/> License No. C-10-773985 _____ _______________________________________________ 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 _______________________________________________ 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 No virus found in this incoming message. 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