Carbon pile battery load tester is what you need. On Sep 18, 2014 3:07 PM, "Randy Cosby via Af" <af@afmug.com> wrote:
> Ah, figured this out. Batteries have been getting down to 20c around > noon, temperature compensation of .12V per degree below 25c, 56.6V is where > we top out. Just right. > > > > On 9/18/2014 3:35 PM, Randy Cosby via Af wrote: > > Before anyone mentions it, I know some of these batteries are being > charged too high. I have my charger (Tristar MPPT-60) set for gel battery > voltages, and the combined voltage is supposed to top out at 56v. It looks > like we're getting a little higher than that, I need to figure out why. > > > > > On 9/18/2014 3:14 PM, Randy Cosby via Af wrote: > > Getting back on topic (and trying to avoid double-spaces)... > > I have two strings of four GEL batteries, all of them the same age. They > are all being charged by the same solar panels/controller. Positive lead is > connected to battery 1, negative to battery 4. Load is connected the same > way. I am now monitoring each battery separately with a pair of sitemonitor > 4-input modules. > > One battery I know is bad - 1.1 (bank 1 battery 1). It drops under 12v at > night. > > The graphs are puzzling to me. The other batteries I'm not sure on. Each > seems to have a different/profile slope when charging, but similar (but not > identical) slope when discharging. Take a look: > > https://dl.dropboxusercontent.com/u/4059343/graff%20voltage%20graps.png > > Anyone care to venture a guess as to why we're seeing these differences? > > > On 9/18/2014 1:57 PM, Chuck McCown via Af wrote: > > Telemetry. Just watch the slope of the discharge voltage at night. I > have tried to use impedance meters several times at different companies and > cannot get results that predict failures. > > If you have a battery that should last several days, disconnect the solar > panels and watch the telemetry. > > *From:* Randy Cosby via Af <af@afmug.com> > *Sent:* Thursday, September 18, 2014 1:06 PM > *To:* af@afmug.com > *Subject:* [AFMUG] battery tester > > Does anyone have a recommended battery tester for AGM and Gel batteries > at solar sites? I have batteries from 100AH to 225AH. Most of the > automotive models seem to be concerned with cold cranking amps, pretty > irrelevant for us. > > > > -- > > <http://www.infowest.com/> Randy Cosby > InfoWest, Inc > 435-674-0165 x 2010 > infowest.com <http://www.infowest.com/> > > This e-mail message contains information from InfoWest, Inc > and is for the sole use of the intended recipient(s) and may > contain privileged, proprietary or confidential information. > > Unauthorized use, distribution, review or disclosure is > prohibited. If you are not the intended recipient, please > contact rco...@infowest.com by reply email and destroy > the original message, all attachments and copies. > > > > -- > > <http://www.infowest.com/> Randy Cosby > InfoWest, Inc > 435-674-0165 x 2010 > infowest.com <http://www.infowest.com/> > > This e-mail message contains information from InfoWest, Inc > and is for the sole use of the intended recipient(s) and may > contain privileged, proprietary or confidential information. > > Unauthorized use, distribution, review or disclosure is > prohibited. If you are not the intended recipient, please > contact rco...@infowest.com by reply email and destroy > the original message, all attachments and copies. > > > > -- > > <http://www.infowest.com/> Randy Cosby > InfoWest, Inc > 435-674-0165 x 2010 > infowest.com <http://www.infowest.com/> > > This e-mail message contains information from InfoWest, Inc > and is for the sole use of the intended recipient(s) and may > contain privileged, proprietary or confidential information. > > Unauthorized use, distribution, review or disclosure is > prohibited. If you are not the intended recipient, please > contact rco...@infowest.com by reply email and destroy > the original message, all attachments and copies. > > > > -- > > <http://www.infowest.com/> Randy Cosby > InfoWest, Inc > 435-674-0165 x 2010 > infowest.com <http://www.infowest.com/> > > This e-mail message contains information from InfoWest, Inc > and is for the sole use of the intended recipient(s) and may > contain privileged, proprietary or confidential information. > > Unauthorized use, distribution, review or disclosure is > prohibited. If you are not the intended recipient, please > contact rco...@infowest.com by reply email and destroy > the original message, all attachments and copies. > > >
