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Plexus MV 650VA UPS With AVR
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£19.99inc vat
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£17.01ex vat
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Saturday, 30th August.
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- manufacturer #: PLEX-018
- quickfind code: 130471
- 832 in stock for next day delivery.
7 reviews
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Product Reviews
VA vs Watt
The fellow who stated that VA is equivalent to Watts is scientific gibberish. They mean totally different things that's why the one says VA and the other says Watts otherwise they would say the same thing.
here is an explanation off the net (or as the Americans would say off of the net):
The definitions are: 1 joule = the energy generated when 1 ampere of electrical
current, passes through an electrical potential drop of 1 volt. Energy = Volts x Current. 1 watt = 1 joule/second. So joules is a quantity of energy, and watts is the RATE of generation of energy. Watt = Energy / second.
THEREFORE:
VA in AC circuits is "reactive power" and has nothing to do with real power. Loads such as induction motors, do not act as pure resistors, but like
inductors. Inductors and capacitors draw AND supply power back into their
power source. Induction motors supply current BACK into the power grid ever
half cycle. These currents tend to somewhat cancel out, but are still there.
If I supply 10 amps on a wire for 1 second, then reverse the polarity and
try again, the net current flow from end to end was zero, but 10 amps were
flowing for 2 seconds.
The 65% rating between VA and Watts is arbitrary, VA to watt ratios can be from 100% to just a few percent. It depends on the type of equipment drawing the load.
in this case a PC.
Superb Value
os:
Windows XPGreat price for a 650va UPS its not worth not protecting your PC at this price.
!!!!
HEY EBUYER!!!!! AS SEEN AS I CAN'T ACCESS YOUR PRODUCT DISCUSSION ON THE FORUMS.<br />
DOES THIS COME WITH THE CABLES THAT CONNECTS THE UPS TO A PC/MONITOR??????????????????
RESPONCE -
This unit doesnt come with the cables to connect to PC only the mains power cable and USB lead. The leads you require can be purchased seperatley in the Cables section under the power subcatagory.
Good, appart from "clicking" noise
os:
Windows XPThis UPS has worked fine for me, i needed cause the electric in my house is a bit dodgy and sometimes to trip-it switch goes, turning everything off.
The only slightly annoying thing about this is that a few weeks after i bought it, it started making a random clicking noise, this was easily solvable though. I just pressed the "self-check" button on the ups and it shut up. Ive had to do this a couple of times, but for the price i really dont mind.
Explanation of "850VA"
You might have been taught that Volts x Amps = Watts at school, but that only applies to DC circuits. In AC, the actual "Watts" rating varies depending on the equipment (inductors vs resistors) for PCs it's roughly 1VA = 2/3 Watt.
This means that this UPS can power up to a ~560W pc. If your pc draws this, the specs for this UPS say it will power it for only 2 minutes. This would probably be enough to shut it down. Probably.
If your pc draws half this (~280W) then according to the specs this UPS will power it for 10-15 minutes. Possibly enough to ride out a small power outage, and still shut the pc down safely.
Also note that it doesn't matter how much your pc's power-supply is rated for, it's how much your pc actually draws from the wall that matters. A pc with a Intel Quad and a 9800 GTX will only draw 280W at full load if connected to a PSU of reasonable efficiency. SLI/crossfire or dual-gpu cards drawing much more of course.
??
will this support a 850W power supply pc and a monitor??
Plexus MV 650VA UPS With AVR
Answer to 850W question...
No, read VA as Watts. This will protect up to 650W at full swing. For power supplies above this rating, look elswhere to be on the safe side.
