Eric -
The minimum battery size we recommend for AC coupled applications is about 100 amp-hours at 48VDC - roughly 4kWH at 80% DOD - this allows good motor starting performance and provides the necessary stability for the battery-less grid-tie inverter to continue powering loads. Smaller batteries have been used successfully - but they need to be either very high performance / low impedance (such as Optima type batteries) or the loads need to be very modest with little starting surge requirements. The cost for the smaller Optimas is usually the same as the larger sealed AGM batteries so they do not make sense to me to use unless the smaller / lighter benefits are needed (such as in a portable display for example). Let me know your specifics and I will work up so recommendations. Christopher Christopher Freitas Director of Research and Development OutBack Power Systems, Inc. [EMAIL PROTECTED] <mailto:[EMAIL PROTECTED]> Tel 360 435 6030 Cell 360 202 4239 19009 62nd Ave NE Arlington WA 98223 USA www.outbackpower.com <http://www.outbackpower.com/> ________________________________ From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Eric Andrews Sent: Tuesday, November 04, 2008 10:56 PM To: [email protected] Subject: [RE-wrenches] AC coupling Fellow PV Techies - When designing an AC coupled PV system using Outback: Am I correct that the battery bank can be minimally small, as they are just there to power the GVFX Output and mimic the grid for the grid-tied inverter of choice? Thanks, Eric R. Andrews NABCEP Certified PV Installer Eco Solar, Inc. Klamath Falls, OR 97601 MESSAGE CONFIDENTIALITY NOTICE: This message (including attachments) is covered by the Electronic Communication Privacy Act, 18 U.S.C. sections 2510-2521, is confidential, and may also be protected by attorney-client or other privilege. If you believe that it has been sent to you in error, please do not read it. If you are not the intended recipient,you are hereby notified that any retention, dissemination, distribution, or copying of this communication is strictly prohibited. Please reply to the sender that you have received the message in error, then delete it. Thank you.
_______________________________________________ List sponsored by Home Power magazine List Address: [email protected] 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
