UPS Voltage?

You are probably looking at a smart charger. It detects that there is no chargable battery connected, so it doesn't charge anything.

Here's a guess but perhaps you're reading the RMS voltage out of the charger. If so, the peak voltage would be about 13.7 volts, a reasonable value for an unregulated trickle charge.

When you're testing a battery's condition with a digital meter, it's best to load the battery down somewhat, because (thanks to the superduper-high input resistance of your meter) it can sometimes show a full, healthy voltage on even a near-dead battery.

I use an old 50 watt 8 ohm resistor.

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Sounds like he is connecting a DC reading meter across the output of the charger circuit without knowing the output waveform and/or with the battery disconnected. Doesn't mean a thing. If wishing to test the charger alone (disconnected) could try a fairly big capacitor and try and read the voltage; but even then may get a peak voltage; not rectified RMS or true DC voltage!! A resistive load would be better to get an average? Suggest a little reading about AC and DC electricity.

Huh?

I replied to BadNight's testing of his *BATTERY*.

Anyway, suggest using a 'scope as the much better way to test a charger output.

ome

Your UPS (Universal Power Source) is used to regulate your output voltage so that it remains constant. It's possible that your battery is just too weak(worn out) to uphold the 12.6 volts required to run your unit. Batteries are a lot cheaper than the whole UPS so you might want to weigh the cost factor in replacing the battery.

Mr. Rick

On 03/23/2009 10:40 AM, snipped-for-privacy@gmail.com sent:

^^^^^^^^^

The OP writes that the UPS is working OK. All the observations seem to indicate a properly working UPS. If the OP tests the UPS by interrupting the A.C. input source and the UPS properly supplies a proper load for the approximate rated time period, then everything is OK.

Pete