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GM7HUD > HELP 21.03.05 10:23l 21 Lines 870 Bytes #999 (0) @ WW
BID : 26525_GB7ESX
Read: GUEST
Subj: re: Cheap n nasty gel cell chgr ?
Path: DB0FHN<DB0MRW<DB0WUE<DK0WUE<I0TVL<GB7YKS<GB7SYP<GB7ESX
Sent: 050321/0834z 26525@GB7ESX.#31.GBR.EU $:26525_GB7ESX [Witham, Esx]NNA V3.1
Paul G0TSG asked:
>Just got a cheap lead acid battery .... 12v 24Ah what the cheapest way
>to charge the thing ?
Ask a neighbour to charge it! :-)
Lead acid cells should be charged from a constant volatge supply. If you
connect it across a 13.8V PSU, it will get reasonably charged but not fully
charged. You realy need 14.4V to fully charge it. Also the hotter it is, the
less charging voltage is needed.
The worst way to charge these batteries is with what is termed slope charging
by manufacturers. This is where your PSU cannot deliver the voltage and current
and so goes into current limiting and lowers the voltage. As the charge current
drops, the voltage rises. This results in the shortest life expectancy.
If you have net access, check out the websites for YUASA and also look up
info on the Unitrode UC3906 (from Texas Instruments).
73 de Andy GM7HUD
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