Hi Dave, The battery charge voltage at 40F/4C should reach 58.76V I think; how was the 66V determined? Not sure how the battery voltage exceeded the High Batt Cut Out, is there a charge controller in the system? - Only at extremely low temperatures (-94F/-70C!) would you get to the 65V absorption level.
The XW should get back in grid-tie sell mode automatically, as long as the battery voltage was above the Grid Support Volts setting. You may want to try dropping that. Hope this helps! Mark Mark Edmunds Xantrex Technology Inc. A subsidiary of Schneider Electric S.A. -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of David Palumbo Sent: Friday, October 24, 2008 6:42 AM To: RE-wrenches Subject: Re: [RE-wrenches] Sealed battery voltages and XW systems Friends: We have a client with a Xantrex XW6048 grid tied 3.4kW PV system with battery backup,(16) Advanced Gel Cells from Power Battery. Batteries are in an unheated garage space. The charge voltage on the gels at 78F is 57v with float at 54v. The temperature correction (according to my charts here) says that at 40F the battery voltage would need to be 66v to be equal to 57v at 78F. We had the Xantrex hi bat cutout set at 65v. The XW System Control Panel flashed a F-49 error "Hi DC Voltage" recently when the temps dipped. I have two questions. 1). We can set the Hi Bat cutout all the way up to 70F. I know this works out temp comp wise BUT will voltage this high damage sealed gel batteries? 2.) Related to the above issue the XW has not automatically reset itself to resume grid sell back after temps warmed up. The XW manual seemed to state that it should automatically go back to selling. This is our first XW. The tech person I spoke to at Xantrex was very inexperienced and was of little help the other day. Any suggestions as to who to speak with at Xantrex? Thanks, Dave _______________________________________________ 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
