Re: [A/S] Univolt overcharging

[Mitch Hill <fmhill@xxxxxxxxxx>]

Bob,

You have a definite problem and hopefully it is the meter as that is the 
cheapest to fix...

First, if it is NOT a digital meter, don't trust it.   Get another meter, 
beg or borrow a known good digital voltmeter to make a comparison test.

Second, if you still have anything over approximately 14 volts DC to a 
fully charged battery, then you have a more expensive problem,  the older 
Univolts have a history of this and you should upgrade to one of the new 
solid state electronic replacement  types such as the Intele-power 9100 
with the Charge Wizard option that Camping World sells.  I mention this 
particular model as it is listed presently in the Camping World Holiday 
Sale flyer I have open in front of me as an example of the type. It is not 
a recommendation for this particular model, there are several makers and 
other models equally as good I assume.

Last but not least, be sure your battery is good and connected with 
corrosion free connections, I use an electrical grease compound called 
No-Alox available at any good electrical supply place, its made for 
aluminum wiring to copper and brass connections, however years of 
experience has taught me No-Alox is the perfect protection for even copper 
wiring connections in DC automotive, RV, and marine systems, I use it 
faithfully on anything of this type here on Cape Cod where corrosion is a 
major issue.

Last but not least, the battery itself maybe old and tired or cooked by 
overcharging, the internal resistance goes up with age and use, and if you 
are truly seeing 16 volts across the battery itself, chances are you  have 
a cooked battery.

Ideally, a fully charged battery should sit with a maintenance charge at 
13.2-13.4 volts, and with no charge about 12.5 to 12.7 volts if it is fully 
charged and no load.   In warm weather while being used and charging, you 
will see voltages in the order of 13.8 to 14.4 Volts typically, and a 
really cold weather charge voltage can be higher even under extremes up to 
15.5 volts. Temperatures and battery age vary these voltages, however if 
you are truly seeing 16 volts across the battery, you have a major problem 
the least of which is a probably a cooked battery and a charger that does 
not have any regulation. It is my opinion both should be replaced.

--
Mitch Hill - K1FH
WBCCI 21960
'64 AS Ambassador International