Hi Roy
On (18 Aug 96) Roy J. Tellason wrote to Alec Cameron...
>> CONTINUED FROM PREVIOUS MESSAGE <<
 RJ> ation again was to put a charger on the battery once a month or so over
 RJ> the winter or however long it was sitting for,  and then a full charge
 RJ> before they went to use it.  This actually cost me some sales,  but I
 RJ> think that those people were happy enough that I ended up with more
 RJ> customers...
You seem optimistic. On average customers don't wish to think these problems,
they just want things to work.
 RJ> I haven't seen any UPS units that used nicads.
I haven't seen any UPS units!
 AC> Important that you keep your chosen trolling battery, at the 
 AC> manufacturer's recommended "floating" voltage.
 RJ> Maybe one of these days I'll call the mfr. and ask them about it...
Gel battery makers [eg YUASA] may have it on the battery side. For Plante and
Faure batteries, we were told 2.25 to 2.35 v/ cell. At the lower levels, 
here
is considerably less energy stored but the volts are held fairly steady. At
the higher levels, you get more energy stored but there is a rapid fall in
voltage during discharge. Some generating station batteries had "end cells"
that would be smartly switched in after say 30 minutes of emergency 
scharge.
These days, most generating stations have AC driven essential auxiliaries [eg
water pumps in nuclear plants] that are driven by intelligent inverters. By
intelligent, I mean AC volts output maintained within 2% even tho the dc 
olts
run from plus 2% to minus 30%.
Thanks for your message, it is good to get more "on topic" in this Echo.
Cheers..ALEC
... ....Horsepower was a wonderful thing when only horses had it
--- PPoint 1.92
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