[RE-wrenches] Magnum Battery Charger Question

Sun Sep 27 10:10:13 PDT 2009

Hi Bob,

I put on an old Todd charger with Voltage regulation,  but not absorb  
and float.  I can change the voltage up or down as needed.  Changing  
out the remote is a good idea.  I do have another Magnum inverter at  
another location,  but was trying to avoid another couple trips....

Thanks,

Jason
On Sep 27, 2009, at 9:57 AM, robert ellison wrote:

> I have had real bad luck with Interstate Batteries. That aside here  
> are some further ideas.
> What type of an external charger are you using? if it is a shop type  
> charger, they don't behave the same as the 3 stage charger in a good  
> inverter and you can't compare them directly.
>
> The best test would be to put another inverter charger on it to see  
> how it behaves. Another Magnum would be ideal. Do you have another  
> available?
> Try a different remote also, just in case there is a problem there.  
> That would allow you to mix and mattch the invertes and remotes to  
> sort things out.
>
> Bob
>
> On Sun, Sep 27, 2009 at 11:44 AM, Jason Lerner  
> <wapalco at rockisland.com> wrote:
> 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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