Hi Steve,
The battery bank consists of four, 415 AH in a
Full River AGM deep cycle batteries wired in a 24 volt series.
That is a new concept to me. Does the battery
bank charge itself through its own chemical
reaction? Would there be any issues with gassing
in the VRLA batteries? Would you recommend doing
anything about this situation, like change charge controllers?
Thanks,
Drake
Drake Chamberlin
Athens Electric LLC
OH License 44810
CO License 3773
NABCEP Certified Solar PV
740-448-7328
<http://athens-electric.com/>http://athens-electric.com/
At 07:10 PM 5/18/2015, you wrote:
Content-Language: en-US
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Hey Drake,
How large is the battery bank?
Ive seen this before on VRLAs with a couple of
companies controllers. Usually this will happen with small battery banks.
Best way to explain it is when the battery bank
is charging and you remove the charge, the
battery is a chemical reaction
its still
charging for a short period of time even though
you have removed the source.
Steve Higgins
Technical Services Manager
P: +1.902.597.4020
M: +1.206.790.5840
F: +1.902.597.8447
Surrette Battery Company
Exclusive manufacturer of
<http://www.rollsbattery.com>
[]
From: RE-wrenches
[mailto:[email protected]] On Behalf Of Drake
Sent: Friday, May 15, 2015 7:10 AM
To: RE-wrenches
Subject: Re: [RE-wrenches] Xantrex C-40 Drifting
I was thinking of a Blue Sky or a Morning Star replacement.
The Full River AGM L-16 batteries recommend a
29.4 absorption, very high for a maintenance
free battery. I've triple checked this one.
At 09:30 AM 5/15/2015, you wrote:
HI Drake,
Iv'e never seen this happen. Â
But have you considered a small morningstar or similar?
A question, you list 29.4v, that seems high?
jay
On Thu, May 14, 2015 at 5:12 PM, Drake
<<mailto:[email protected]>
[email protected]> wrote:
I have a Xantrex C-40 that won't keep its
settings. It is important that it does because
it is for a maintainer array (80 W) on an AGM
battery bank, on an AC coupled backup system.
Not only could high voltage damage the
batteries, but when the voltage goes over 30
Volts, the AUX relay opens and the grid tie inverter is isolated from the grid.
After numerous sessions of reprogramming,
Xantrex tech support sent me a new unit. The
problem persisted as before. A new temperature
sensor helped, but the settings still drift. It
seems that rebooting the charge controller helps
for a day or so, but then it drifts again.
The potentiometer settings are way below the
calculated setting for 29.4 V, but it still
peaks in the high 30s. I check the temperature
compensated voltages on the Outback Mate, and
the temp compensated voltage runs high.
In a related side issue, the AUX relay of the FX
inverters is not based on temperature
compensated voltage, which makes setting AC
coupling charge set points more problematic.
Has anyone experienced a C-40 CC that drifts in
its settings. What would be a good (inexpensive)
charge controller to accurately control 80 W of PV?
Thanks,
Drake
--
Jay Peltz
Peltz Power
<mailto:[email protected]>[email protected]
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