[RE-wrenches] Magnum Battery Charger Question

[robert ellison]

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 <wapalco at rockisland.com>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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