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From: jmuchow@SPAMMENOTcamlight.com (John Muchow)
Subject: Re: Limiting total wattage for a constant-current dummy load?
Date: Tue, 12 Nov 2002 05:07:39 GMT
Organization: MindSpring Enterprises
X-Server-Date: 12 Nov 2002 05:13:07 GMT
X-Newsreader: Forte Free Agent 1.21/32.243
>>>Have you ever thought about using several light blubs in series/ parallel
>>>to give you a dummy load? If you burn one up, it doesn't cost you an arm
>>>and a leg.
Funny you should mention using light bulbs...that's how all this got
My friends originally used them to discharge their battery packs after
a day of running their R/C/ cars. They've also purchased a few
battery chargers w/integral dischargers but they all have very low
discharge current levels. What they wanted was a unit that could
discharge as quickly as an array of bulbs, but with the auto-cutoff of
their charger/discharger units. This is where I came in. :-)
I've got a few auto-cutoff units but they have fixed-value load
resistors. This, like the bulb-array dischargers, is fine for
discharging but can't be used for testing the capacity (AH rating) of
batteries. And if there's one thing R/C car users LOVE to do, it's
debate who's cells are better...Sanyo, Panasonic, etc.
You definitely can't beat the cost of a bulb discharger, but I need to
have a constant-current load so the battery pack has the same amount
of current going through it all the way down to its cutoff point.
This allows us to simply multiply the current level by the time it
took to discharge to arrive at the true AH-rating for the cell or
pack. Another advantage of a constant-current dummy load is that I
can easily select a different current level by just turning a knob.
Thanks for the suggestion though! :-)
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