Posted by
Jim Brown-10 on
Aug 31, 2017; 9:53pm
URL: http://elecraft.85.s1.nabble.com/Wattage-Draw-K3S-100-vs-KPA500-KAT500-for-UPS-tp7633842p7633923.html
Good observations, Lynn. A few more. First, I failed to observe that my
100Ah LiFePO4 battery runs ONLY my K3s. A big lead-acid from Costco runs
other 12V gear and LED lighting. I do NOT try to provide UPS for power
amps. If I need them, I'll fire up the big 240V generator.
Second, a local computer guru, AE6KS, has observed that most UPS mfrs
charge batteries at too fast a rate for good battery life. The objective
is to have the unit ready to do it all again if power drops, then
returns, then drops again. This intentional design goal kills batteries
pretty quickly.
Perhaps by accident, I found Cyber Power branded UPS units that 1) claim
an 8 hour charging rate and 2) FCC Part 15 Class B compliance for their
pseudo-sinewave units. I have two of them in my shack with a 160M
vertical only 25 ft away, and with good chokes on their wiring, can't
hear any noise when they're in standby mode. Haven't checked for noise
when they're inverting.
I use one to keep an ancient tower computer running, and the second one
to backup the 120V accessories -- rotator controllers and SteppIR
controller -- and the laptop PSU is plugged in there.
73, Jim K9YC
On 8/31/2017 10:46 AM, Lynn W. Taylor, WB6UUT wrote:
> Jim's suggestion also lets you size the battery to run all the gear
> for more than a few minutes.
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