[RE-wrenches] Desulfators

Larry Crutcher, Starlight Solar larry at starlightsolar.com
Fri Jun 19 21:03:09 PDT 2009


Hey Chris,

A few years ago I built a pulser circuit the produces a 35 Vp-p spike  
at 1 kHz. I have used it a quite a few times to recover abused  
batteries. Usually newer batteries that have been chronically  
undercharged, both AGM and flooded. My restore method is use a high  
voltage charge (up to 2.5V per cell @ 77 degrees) with the pulser  
connected for few weeks watching the current first rise then drop.  
Then I do a constant current equalization with no voltage limit, just  
watch the temperature, until the current drops to 1.5A per 100AH  
capacity for flooded or 0.7A per 100AH for AGM. I have put quite a few  
batteries back in service.  When a battery is still connected to the  
inverter, the spike is filtered down quite a lot but still present.  
I'm not sure how effective it would be just putting one in a system.

A commercial manufacturer came by our retail store last winter wanting  
me to carry their charge and pulser products. I put one on the bench  
with the rep watching and could not see any pulse on the scope, just  
lots of ripple that I could not lock onto.  I grabbed my pulser to  
show him what I was looking for. The rep could not explain it why  
theirs did not do the same. I suppose there could be several  
desulfator designs out there. I have not tested any others.

Larry Crutcher
Starlight Solar
(928) 941-1660
Renewable Energy Products, Service and Installation

On Jun 18, 2009, at 7:12 PM, Chris Daum wrote:

>
> Dear folks:
>
> What is y'all's opinions on desulfators?  I have a customer who is  
> having to do a battery upgrade, and someone's stuck a bug in her ear  
> about them.  I figure proper battery care is most essential, but I  
> am interested in hearing about your experiences.
>
> Thanks so much for your information!
>
> Chris Daum
> Oasis Montana Inc.
>
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