nuckolls.bob(at)cox.net
Guest
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 Posted: Sat Jun 07, 2008 11:20 am Post subject: Report on the Harbor Freight 42292 battery charger (WITH C |
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At 02:01 PM 6/7/2008 -0500, you wrote:
<nuckolls.bob(at)cox.net>
A short time ago I picked up a version of this device
from Harbor Freight.
http://aeroelectric.com/Pictures/Battery_Chargers/HF_Chargers/42292.gif
Hooked it up to a partially discharged battery yesterday
morning with a data acquisition system to plot its performance.
At .47A load its output voltage is 11.62 volts. At .67A it
drops to 8.33 volts. So with a delta-V of 5.07 and delta-I
of 0.2 the output impedance calculates to 5.07/.2 = 25
ohms. It is votlage limited to about 13.4 volts of output.
If it were NOT voltage limited, it would be classified
as a "trickle charger". By adding simple voltage limiting,
it's not capable of damaging a battery but also not capable
of topping off a discharged battery. However, it is entirely
suited to keeping a charged battery from discharging itself
in long term storage.
If I were choosing sides for HF el-cheeso battery chargers
also suitable for long term storage, it would have to
be the 93258.
http://aeroelectric.com/Pictures/Battery_Chargers/HF_Chargers/HF93258_1.jpg
Bob . . .
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( . . . a long habit of not thinking )
( a thing wrong, gives it a superficial )
( appearance of being right . . . )
( )
( -Thomas Paine 1776- )
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