[RE-wrenches] Magnum Battery Charger Question

[Jason Lerner]

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  
> <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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