This may help some 105/110/120VAC-area readers decide how to handle
short-term power needs.
I would not expect all but the very most critical equipment to need an
online always-on UPS. I am typing on a tower-type computer (400W power
supply) plugged into a standby Xantrex 400 watt sinewave inverter(1)
connected to 200 AH of golf-cart lead acid batteries. An IOTA 55 Amp
charger(2) keeps the batteries topped off. That does have some discrete
RFI, but not on frequencies I use normally, and rarely bothers anything
when when the battery is charged, The Xantrex switches rapidly and draws
current only when the power is off; I have used it for Field Day
operations and not even noticed when the generator ran out of gas.
(However, I advise anyone operating that way not to use their car
battery to run the station.)
1)
http://www.xantrex.com/documents/Power-Inverters/XS400/06222006JS_XS400%20Sine%20Wave%20Inverter.pdf
2) http://www.iotaengineering.com/dls55.htm
Power has gone off a few times here, but the switchover is fast enough
to be unnoticeable except that only one CFL desk lamp stays on.
I recently found a small Belkin UPS meant for AT&T U-verse systems at a
local thrift shop, which I am keeping charged up to run other small
electronics that need either AC or "wall wart" power.
http://cache-www.belkin.com/support/dl/p75319-b-bu3dc000-12v.pdf
Cortland
KA5S
On 3/8/2013 1010, Pierfrancesco Caci wrote:
...should I be lured by an on-line, sinusoid waveform UPS, or am I likely to
get lower RFI from a
line-interactive one that doesn't keep the inverter on at all times?
The UPS would be used only for the PC, Monitor, switch and maybe the
printer if there's a filtered, non-protected port.
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