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:
signature
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 <mailto:af@afmug.com>
*Sent:* Thursday, September 18, 2014 1:06 PM
*To:* af@afmug.com <mailto: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
contactrco...@infowest.com by reply email and destroy
the original message, all attachments and copies.
--
signature
<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
contactrco...@infowest.com by reply email and destroy
the original message, all attachments and copies.
--
signature
<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
contactrco...@infowest.com by reply email and destroy
the original message, all attachments and copies.
--
signature
<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
contactrco...@infowest.com by reply email and destroy
the original message, all attachments and copies.
