Hello Bob,
Yes I have deep cycled the batteries. I only mentioned the 12.7
because above that voltage it will skip the absorb charge. Interstate
batteries, and all the connections are good and tight, specific
gravity all good as well.
I was thinking maybe it is an intermittent internal connection, but I
put an external charger on the same battery bank and it charges just
like it should....
Thanks for the hints,
Jason
On Sep 26, 2009, at 8:11 PM, robert ellison wrote:
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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