Posted by Ron Rosenfeld on March 17, 2010, 7:43 pm
wrote:
>More likely there is something wrong with either the UPS or the computer
>power supply. Switching power supplies run fine off of a square wave.
>In fact, they run more efficiently off of a square wave than a sine
>wave, and they typically will run at anywhere from 50 to 250 volts.
Perhaps you missed my description of the type of power supply. As a matter
of fact, this particular problem is apparently pretty common with PFC
PSU's.
--ron
Posted by Brad Guth on March 6, 2010, 9:57 pm
> wrote:
> >Why would you want a UPS connected to a Trace SW5548 Inverter/Charger in
> >the first place? Just plug your computer into the Trace and be done with
> >it. I have lived Off-Grid for 20 years, and generate ALL my own power.
> >I have a Trace Inverter/Charger that runs All the Micro-ISP Hardware,
> >(Servers, Routers, Switches, Access Points, SAT Modems, etc) and isn't
> >even a SW Series, but a U2624SB Modified Square Wave unit. I have a
> >SW4024, and a SW4048 that run the Cabin, and all the Workstations,
> >inside. Never had to worry about UPS's as the Trace does that job just
> >fine. We run one of a pair of 20 Kw Diesel Gensets, for 10 hours a day,
> >(7Am to noon, 5Pm to 10Pm) and that keeps the Batteries charged,
> >Freezers cold, and Telco System Batteries charged.
> What Bob said.
> Since the SW5548's aren't "really" a true sine wave, but rather they mimic
> it with multiple steps, I'm wondering if that waveform would be good
> enough.
> --ron
More than good enough.
~ BG
Posted by Ron Rosenfeld on March 17, 2010, 7:45 pm
wrote:
>> wrote:
>>
>> >Why would you want a UPS connected to a Trace SW5548 Inverter/Charger in
>> >the first place? Just plug your computer into the Trace and be done with
>> >it. I have lived Off-Grid for 20 years, and generate ALL my own power.
>> >I have a Trace Inverter/Charger that runs All the Micro-ISP Hardware,
>> >(Servers, Routers, Switches, Access Points, SAT Modems, etc) and isn't
>> >even a SW Series, but a U2624SB Modified Square Wave unit. I have a
>> >SW4024, and a SW4048 that run the Cabin, and all the Workstations,
>> >inside. Never had to worry about UPS's as the Trace does that job just
>> >fine. We run one of a pair of 20 Kw Diesel Gensets, for 10 hours a day,
>> >(7Am to noon, 5Pm to 10Pm) and that keeps the Batteries charged,
>> >Freezers cold, and Telco System Batteries charged.
>>
>> What Bob said.
>>
>> Since the SW5548's aren't "really" a true sine wave, but rather they mimic
>> it with multiple steps, I'm wondering if that waveform would be good
>> enough.
>> --ron
>More than good enough.
> ~ BG
You're probably right about the SW5548 being "more than good enough". After
I initially posted here, I recalled that a self-built computer of mine,
that I use at the off-grid location, has a SeaSonic PSU which "is" a PFC
PSU. I had purchased it because the increased efficiency was advantageous
in that off-grid location. And it's worked fine. So I'm guessing the Dell
would probably work OK also.
--ron
Posted by z on February 23, 2010, 4:57 pm
> Does anyone know if this computer will run on an SW5548?
>
> My wife just purchased one for our "on-grid" home and we discovered
> that an APC UPS (BackUPS RS-1500), that works fine with older models,
> will not work with this one.
>
> Apparently the XPS9000 PSU apparently requires a better quality "sine
> wave". The UPS can be upgraded. APC's SmartUPS series is supposed to
> work.
I see a lot of people complaining about this issue. Seems pretty bone
head for Dell to do that. Looks like you could swap out the PSU with one
that works if you needed to do that.
http://en.community.dell.com/forums/p/19298255/19566274.aspx
>
> But now I am wondering if anyone knows if the power at our "off-grid"
> home, from our SW5548's, would be "good enough".
according to the sw5548 blurb:
"Designed to provide homes with a completely independent power supply,
the SW 5548 offers sinewave, utility grade output power, high capacity
battery charger, high surge current ability, and easy installation"
So if it is a sine wave you should be good.
Or spend 50 bucks on another PSU that will take square waves (like most
do). Looks like the DELLS and other companies are using PSU's that are
within European Spec's (which require sine waves apparently) so they
don't have to have two types for different markets. Your standard Antec
or other quality 3rd party PSU's will work on your computer though --
it's not required by any internal hardware specific to your DELL. YOu
will invalidate your warantee by doing that though.
best
-z
>
> Thanks.
> --ron
Posted by wmbjkREMOVE on February 23, 2010, 5:45 pm
>Looks like the DELLS and other companies are using PSU's that are
>within European Spec's (which require sine waves apparently) so they
>don't have to have two types for different markets.
3 Dells here. Dimension desktop about 3 years old, Vostro laptop about
18 months old, and Studio laptop about 6 months old. All work fine on
SW4024s. Both laptops have universal power supplies that accept
100-240V, 50 or 60Hz.
Ron, does your Dell refuse to start? My previous HTPC would do that
sometimes on first boot after being unplugged and re-powered. But if I
waited for a half hour and tried again, it would be fine until the
next unplugging (months). Then the power supply died (it was a real
cheap one that came with the HT case), and I figured that once I
replaced it with something better the quirk would go away. No such
luck. After a year or so without any issues with the new PS, I
unplugged the box to do some parts swapping, and it never booted
again. Turned out it was a common fault with that particular
motherboard. The new MB (an entirely different animal which is also
happy on the SWs) has been flawless for about a year, but I've read
complaints that some owners of the same model occasionally have to
remove and reinsert the CMOS battery to cure a refusal to boot.
Wayne
>power supply. Switching power supplies run fine off of a square wave.
>In fact, they run more efficiently off of a square wave than a sine
>wave, and they typically will run at anywhere from 50 to 250 volts.