[Woodworkers] OT-Electrical

[Steve Bigelow via Woodworkers]

Hi John,

If you have automatic backup and you don't have a powerful computer, than
that's fine. A lot of computers today have a 750W power supply, and I never
see any with less than 500W. 375VA is approximately 250W (just guessing, no
math).

I'm willing to bet that if your computer was cranking away on a hard
calculation when the power went out, your computer would go down as well.

Obviously if you have a laptop you don't need a UPS, unless you are using
it for your monitor.

One other benefit if you have a better UPS is that it will also monitor for
under AND over voltage conditions and regulate to the correct AC voltage.
Oh, and you generally get a sine wave inverter with the bigger units
instead of the sine wave approximation inverter.


Regards,
-Steve

On Wed, Aug 2, 2017 at 10:16 AM, John McCaskill <jmccaskill at gmail.com>
wrote:

> Curious. Why isn't a 500 VA UPS OK? In my case it has to power only the
> computer and monitor for less than a minute before my natural gas generator
> and transfer switch automatically kicks in, so run time is really not a
> factor for me.
>
> Are they less reliable, more cheaply built, don't have a life as long as a
> 1000 or 1500 VA unit? Or is it just the capacity?
>
> I have my inkjet printer plugged into a separate 300 VA UPS.
>
> John
>
>    - Everything is always okay in the end, if it's not, then it's not the
>    end.
>
>
> On Aug 2, 2017, at 11:49 AM, Steve Bigelow via Woodworkers <
> woodworkers at lists.sawdusters.org> wrote:
>
> No, you don't need a larger circuit breaker. It isn't tripping, so putting
> a new one in isn't going to help.
>
> Do you have the printer plugged in to the UPS? If so, plug it in directly
> into the wall. You really don't want your printer on your UPS anyway.
>
> I have to assume that you are far away from your breaker box...
>
> I'm also guessing you have a 375VA or 500VA UPS. Those aren't really worth
> the $30 -$50 that they cost. You want a 1,000 or 1,500 VA UPS. Even that
> isn't big enough if you have a laser printer plugged in to it.
>
> Regards,
> -Steve
>
> On Wed, Aug 2, 2017 at 9:20 AM, Thomas E Lovelace via Woodworkers <
> woodworkers at lists.sawdusters.org> wrote:
>
>> Of course, a USP is just a UPS in hiding!
>> TomL
>> > On Aug 2, 2017, at 11:14 AM, Thomas E Lovelace via Woodworkers <
>> woodworkers at lists.sawdusters.org> wrote:
>> >
>> > I just bought a Brother BW laser printer.
>> > Works great !
>> > EXCEPT:  when I first turn it on, and a USP is also on line, the UPS
>> will turn off.
>> > After turning it back on while the laser is on, all runs well.
>> > Seems that the initial power on of the laser  is a bit much for the 15
>> amp circuit breaker?
>> > QuestionL can I swap the 15 amp CB for a 20 amp unit. I realize that
>> the size wiring might be just a tad small for a continuous 20 amp load but
>> the actual load is no where that high . Just for the instant the laser
>> comes on.
>> > Can I make the CB swap?
>> > Appreciate an opinion from the experts here!
>> > Thanks
>> > TomL
>> > _______________________________________________
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