[Elecraft] UPS Can Be a Noise Source

[Lynn W. Taylor, WB6UUT]

Keep in mind that by code, a device plugged into a 15 amp circuit must 
not draw more than 12 amps continuous.

When you get into the larger UPSes, they might want to charge really 
fast, but charging at a high rate and carrying the rated load will 
exceed 12 amps.

So depending on the rating of the unit, and the recommended input 
circuit, some models will definitely charge slow.

16 hours is not too fast for charging.  If the UPS can't carry the load 
for ten hours, then the discharge rate is WAY TOO FAST.

Most UPSes are designed to carry the load for about 15 minutes, so if 
you aren't killing the battery charging, you're killing it discharging.

73 -- Lynn

On 9/1/2017 10:32 AM, Phil Kane wrote:
>> Second, a local computer guru, AE6KS, has observed that most UPS mfrs charge batteries at too fast a rate for good battery life.

> Both spec sheets show a recharge time of 16 hours.  Is that "too fast"?