Hello Darryl,
Yes the battery charger is going to absorb for a full cycle then to
float, but the problem is the battery charger is set to 14.4, but the
battery bank only gets to 13.8 for the absorb cycle then goes to
float. I unplugged the BTS thinking that was bringing the Voltage
down, but that did not change anything. I tried changing the absorb
voltage using the custom setting to 15.2 Volts to try to trick a
higher voltage absorb but that did not help. Specific Gravity shows
appropriate for each cell.
I connected an external battery charger to the same battery bank and
it charges just fine, so my question is about the Magnum battery
charger.
Thanks for your help,
Jason
On Sep 27, 2009, at 6:47 AM, Darryl Thayer wrote:
I am a little confused, is it the batteries or the charger that is
giving you problems. Perform a charge cycle and measure the charge
current and charge voltage. Check the specific gravity, resting
voltage before starting, perhaps the charger is going to absorb
volts and droping to float?
Just a thought
Darryl
--- On Sat, 9/26/09, robert ellison <[email protected]> wrote:
From: robert ellison <[email protected]>
Subject: Re: [RE-wrenches] Magnum Battery Charger Question
To: "RE-wrenches" <[email protected]>
Date: Saturday, September 26, 2009, 10:11 PM
Have you deep cycled the batteries?
Normally you would be way below 12.7 when you had to use a
generator to charge,12.7 is fully charged for a 12 volt
pack.
.
Cycle them down to 10.5 to 11 volts or so a few times
and charge them back up.
See if it charges better when cycled.
What brand of batteries are these?
The magnum chargers are great, and if shorted it goes
to 14.4 volts the charger is fine.
Any chance you have bad connection somewhere? If you
have one try using a infared pyrometer to look for a warm
connection somewhere. But it has to be after you charge for
a while, give it time to heat up.
Bob
On Sat, Sep 26, 2009 at 12:04 PM,
Jason Lerner <[email protected]>
wrote:
Hello
All,
Have a question on a Magnum 1212MM-AE. The battery
charger will not get above 13.8 Volts. The system worked
fine for the first three weeks with Voltage rising to 14.4
volts for the absorb cycle, but now it will not. The
battery size and type setting are correct, and using the
"custom" charging profile set to 15 Volts does not
work.
We have tried unplugging the BTS, while also making sure
the battery Voltage is below 12.7 when starting the
generator. The remote control is attached and there is 35
amps going into the battery with a 2KW honda. It will sit
at 13.8 Volts and do an absorb cycle for 2 hours and then go
into float. There are 4 golf cart batteries in the system
and all cells check out good, no dead cells, and
connection are all bright and tight. Turning the main DC
disconnect off while the gen is running shows 14.8 Volts at
the battery terminals of the inverter, but the batteries
will not rise above 13.8. Magnum says the battery charger
is fine since it goes up to 14.8 when the batteries are
disconnected, but that doesn't make for a very efficient
charger if it is not connected to the batteries......
I am not familiar with these chargers, did I miss
something, any ideas?
Thanks,
Jason Lerner
Waldron Power and Light Co.
(888) 927-2526
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