Electronics > Projects, Designs, and Technical Stuff
Simple load for testing lead-acid battery chargers.
tszaboo:
Secret tip: If you have a DC load, you can plug a bunch of big resistors in series with them, and connect the voltage sense line appropriately. Then disable the power protection. It will turn your DC load into a bigger DC load, acting like there is a lot of drop on the current leads. And current and voltage controls still work.
RoGeorge:
For lead-acid batteries I am using auto light bulbs as loads.
calzap:
NANDBlog,
Yeah, I was aware of that technique, but thanks for the reminder. But: 1. don't want to take my electronic load off the bench, 2. need only a single current draw per each of the three voltages, 3. would not have saved much money because would have needed power resistors in any case.
Mike in California
calzap:
Problems using incandescent auto headlights or tail lights for testing lead-acid batteries:
1. Would take a bunch to do 8 A at 36 V, 2. bulkier than power resistors, 3. cost more per watt than power resistors, 4. break easily, 5. resistance changes as they warm-up, 6. resistances probably less accurate than for power resistors, 7. resistances may vary among brands, 8. difficult to solder or have to use sockets, 9. might cause blindness ... OK, probably not. ;)
Mike in California
Vovk_Z:
I think resistance of bulb lamp is as acurate as power resistor (5%) or even better. But I agree with other.
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