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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