Battery mystery [RE-wrenches]

[Brad Bassett]

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Allan,

Check to make sure the module is not reversed polarity, that will drain 
the battery pretty well, but probably not the siuation here since it 
sounds like the generator started for a while.

Even without a blocking diode your net charge will be greater than the 
nighttime discharge by a wide margin. 

If the generator is taking a long time to start and not running long 
enough to recharge the battery it will slowly go down. Two ways to fix 
this; one is make the generator run longer when exercising, or put a 
larger module on the starting battery.

Brad

 
Allan Sindelar wrote:
> 
> Fellow Wrenches,
> This seems minor, but I lack a clear answer...
> 
> In December we replaced the 12V starting battery on a Kohler 8.5RMY
> generator for a BU-only PP-SW5548/D system we maintain. The gennie is 
> set to
> exercise once every week or two. The 8.5 has simple controls, rather 
> than
> the gauges and all of the large units; I have measured 0 mA draw on 
> standby
> (off) mode. We have a 1.5W trickle module keeping this battery charged, 
> that
> we purchased from AEE.
> 
> The problem is that the client called me recently to report no starting. 
> On
> visit, the generator battery's voltage was too low. The charge module 
> was
> showing expected voltage and current.
> 
> I pulled the battery and hope that I can replace it under warranty at 
> the
> auto parts store where I purchased it. It could be a bad battery, but I
> suspect not. The only other cause I can imagine is that the trickle 
> module
> either lacks a blocking diode or it has failed, and it is slowly 
> draining
> the battery at night.
> 
> Has anyone seen this? Any other ideas?
> 
> Thanks for any help,
> Allan @+NRG
> 



Brad Bassett
AEE

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