Drake Chamberlin wrote:
boB,
Thanks, I will check all connections when I get out there. Is there
anyway a loose connection could cook the batteries?
A loose connection, if it was like I described, would tend to
under-charge the batteries. I would think that
if there were ~that~ much of a voltage drop, and significant current,
you'd have a pretty hot connection
somewhere. Although, if the connection is bad enough, you might just
get the CC to get to Absorb or
Float voltage and that would at least limit the current but maybe not
enough..
Of course, loose connections may not be the problem, but that's what I
look for first.
I would measure the voltage at the CC terminal block and see if it is
telling the truth.
If the CC is telling the truth, then she may have a bad connection, and
then
it's Warning Will Robinson !!
Could be intermittent too. Then ya may want to start wiggling and
banging on things.
It sure worked well with TV sets.
boB
Thanks,
Drake
At 03:16 PM 8/14/2010, you wrote:
Drake Chamberlin wrote:
I called her back just now, and the voltage readings on the Mate, MX
and Trimetric all match. Humm.
The batteries are 4, 4 1/2 year old, U.S. Battery L-16s wired in 24
volt configuration. It seems that I remember postings of Wrenches
having problems with these batteries. There is about 1 KW STC of PV
on the roof.
Might want to be careful of loose connections. Maybe the MX was
putting out some high(ish) current and there
was a voltage drop across that connection, and now they are reading
the same because the current is
lower from the MX. i.e. high voltage at the terminals of the CC and
lower at the actual battery terminals.
boB
At 12:12 PM 8/14/2010, you wrote:
Any way she can get a real voltmeter? the MX60 has voltage
calibration, so does the FX it sounds like something is over
charging, perhaps the generator run? additonal details on battery
bank size, array size and typical load. Darryl
--- On *Sat, 8/14/10, Drake Chamberlin
/<[email protected]>/* wrote:
From: Drake Chamberlin <[email protected]>
Subject: [RE-wrenches] Voltage discrepancy
To: "RE-wrenches" <[email protected]>
Date: Saturday, August 14, 2010, 8:58 AM
Hello Wrenches,
I just got off the phone with an off grid system owner who has a
voltage discrepancy showing between the reading on her MX-60 and
both her Mate and Trimetric meter. The MX-60 shows 28.8 V and
the Trimetric and the Mate both show around 25 volts. The
batteries are using a tremendous amount of water.
Has anyone seen this scenario before? Do you think the MX-60 is
bad?
Thanks,
Drake Chamberlin
Athens Electric
OH License 44810
CO License 3773
NABCEP TM Certified PV Installer
Office - 740-448-7328
Mobile - 740-856-9648
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CO License 3773
NABCEP TM Certified PV Installer
Office - 740-448-7328
Mobile - 740-856-9648
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