[aprssig] Re: OT - DC Auto Charger with auto cutoff
bruninga at usna.edu
Tue Jul 20 09:04:54 CDT 2004
>>> "KC2MMi" <kc2mmi at verizon.net> 7/19/04 10:06:23 PM >>>
>>When considering operating mobile/portable do not
>>overlook the DIRT CHEAP uninterruptible power supplies
>>that are showing up in junk piles and at hamfests. >
> Um. Except many.most of the cheap ones are designed to
>run off gel cells, which run at a significantly lower voltage
>than wet lead or AGM batteries.
Hummh.. All the ones I have found, are using either
12 volt or two 12 volt batteries and the battery chemestry
is similar and so they will work just fine from a car battery.
> They will not optimally charge "vehicle" batteries, and
>although they make great cheap inverter/chargers...
>they're also designed to recharge ... at something like a
>20-hour rate, a very slow charge.
Yes, true, I agree.. But in many HAM mobile applications,
re-charge time is not an issue, the UPS and availability of
battery generated AC is either to fill in emergency power
interruptions or short term sourcing of power. The requirement
for -high-amp rapid charging is unusual in the typical "field
day" style of ham radio operating...
Anyway, they are cheap and very useful...
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