Jesse, Check with manufacturer to be sure. I've had AGM's in 24v system's set at 29.2 Bulk/Absorb and other manufacturers (Full River for one) that say 29.6 is fine. So, with an FM80 I would recommend 4 strings of 2 modules to ensure that you can always get that VMP up where it needs to be.
David Palumbo Independent Power LLC 462 Solar Way Drive Hyde Park, VT 05655 www.independentpowerllc.com Vermont Solar Partner 25 Years Experience, (802) 888-7194 -----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of Jesse Dahl Sent: Monday, May 13, 2013 10:34 PM To: Wrenches Subject: [RE-wrenches] Charging voltages Hello, I'm interested in charging voltages for AGM batteries. After my visit to the site mentioned in the battery box thread, I was thinking about the system. New install, 8 solarworld 255s charging a 24V battery bank through a outback FM80 (MPPT) All 8 modules in parallel. VOC - 37.8 VMP - 31.4 ISC - 8.66 IMP - 8.15 I'm interested in the setpoints people use for AGMs because it seems like this might be cutting it close to the setpoints based on the array voltage. Since the system is using a MPPT controller would it be better to increase the array voltage? Battery bank is 6 12V 245ah east penn bats wired 3 strings of 2. I haven't used sealed batteries outside my fish house and boat so I'm looking for some detailed info if I can get it. Thanks a lot! Jesse Sent from my iPhone _______________________________________________ List sponsored by Home Power magazine List Address: [email protected] Change email address & 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: [email protected] Change email address & 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
