Good deal. This UPS price range is in between $199-220 when it's on-sale.
The following sellers are the same price atm, enjoy :)
smarthomestoreau https://www.ebay.com.au/itm/124099709321
futu online https://www.ebay.com.au/itm/333506228478
Remember, actual usable power is ~70% so ~670w
So if you had say a NAS 30W, router 20w, NBN modem 10W. That's 60w
So you'd expect them to be powered for ~10hrs.
The other purpose a UPS is used for is for brownouts & fluctuations. It keeps electronic equipment happier.
No, lucky to get an hour
So you'd expect them to be powered for ~10hrs
No… You'd expect to get an hour from low load.
At 670w it'll run for a few minutes. Multiply by ten for a 67w load…
? 60w would last a few minutes?
No, 60W would be 60/12 which is 5 amps. At 18Ah of battery (9 usable) you could technically get 2 hours. With inefficiency I reckon closer to 1hr. So I was a but out when I said lucky to get an hour, maybe get a bit over that
@MikeKulls: Joules are energy/second, watts are quoted in hours.
60w is 60 watts per hour usage. An old fashion 60 watts light bulb uses 60 watts every hour. A 30 watt NAS uses 30 watts every hour.
My NAS power brick is 12v and 5Amp, it's rated at 30watt, but the power brick could draw 60watts (12 x 5) that's what it uses over an hour.
@M00Cow: That's simply not right. Joules are energy, there is no unit of time involved, think of it like a volume of water. Watts are literally joules/second, this is like water consumption rate litres/second. A 30w light will use 30 joules per second so 30x60x60 joules in an hour (108kJ). An 18Ah battery at 12V will contain 18x3600x12 joules (777.6kJ). So a 30W load would take 18x3600x12/30 seconds to flatten the battery (7.2hr)
To translate what you said using the units of distance
"metre is distance/second, speed (metres/sec) is quoted in hours.
60m/s is 60 metres per second per hour travelled. An old fashion 60m/s car travels 60 metres per second every hour. A 30 m/s car travels 30 metres per second every hour."
This bit here makes no sense at all. It's like saying my tap can deliver 30 litres of water an hour but somehow I can get 60 litres of water an hour out of the tap.
My NAS power brick is 12v and 5Amp, it's rated at 30watt, but the power brick could draw 60watts (12 x 5) that's what it uses over an hour.
An 18Ah battery at 12V will contain 18x3600x12 joules (777.6kJ). So a 30W load would take 18x3600x12/30 seconds to flatten the battery (7.2hr)
Another way to calculate this is to say :
An 18Ah battery at 12V can can ouput 18 amps * 12 volts = 216W for one hour.
So it could power a 30W load for 216/30 = 7.2 hours.
@Nom: That's true, lots of ways to do it. I was just trying to demonstrate the basic example of joules and W.
@M00Cow: Incorrect.
Joules has no time associated with it. Watts is 1 joule of work performed per second.
Your comment was consistently inconsistent, it boggles my mind how you can type all that with such conviction.
"60w is 60w/hr" WTF? then how much energy is 1 watt for any given time or is it an endless logic loop???
60W = 60 joules/ second.
@[Deactivated]: This is a very misunderstood topic, I think largely due to the crappy units of Ah, kWh and even watts to some degree (J/s would be simpler). It can be a simple topic, eg a battery contains 1MJ, we use 30J/s, so battery lasts 9.2hrs
The runtime at half load - 480w - is 11 minutes.
So with 60w draw you might get 88 minutes if you're lucky đź‘Ť Nowhere close to 10 hours…
@Nom: If the 11 minutes is accurate you should get more than 88 minutes as batteries give out more energy when discharged slowly. It can be fairly significant.
Simple math is not relevant here
Either is electrical physics
I just bought this for $194 from the Afterpay deal.
Yeah I got a few mates onto that.
Can I use this to power a vaccine fridge for 15 minute?
That depends, will you be storing Blue Pills or Red Pills in it?
Haha…… no pills…just lots of Covid vac. So for a 400 Watts fridge, and this UPS is rated at 950W, how long can it power the fridge?
A good idea would be to fill the empty spaces of your Fridge with Water bottles or Gell packs to increase the thermal capacity of your fridge incase of power outage. Stats say that it should provide 11 mins of power at half load (~480w)
The problem with high current devices (like a fridge), is that it tends to overload the battery and lower the time.
Being important stuff you're protecting, Your best bet is to contact CyberPower and ask.
https://www.cyberpowersystems.com/company/contact/
To be honest you're better off buying second hand one from Facebook marketplace for less than $50 and then buying new batteries.
Look for the APC ones which have a pure sine wave inverter. They don't buzz.
I bought a APC 1500VA server rack one for $30 and then got some batteries.
This.
Look for Smart UPS models though, not Back UPS - the Back UPS are the budget models without pure sinewave etc.
APC 1500VA server rack - there is nothing under $300.
they do come up, you just have to keep an eye out and be patient.
people who are selling it for $300+ are the ones who know what they are worth, but just keep an eye on those ads, they generally won't sell because most people buying UPS don't know the difference between a pure sinewave and a modified sinewave so they don't put a premium on the APC Smart UPS. Buyers even discount the server rack one because they think they need a server rack… I just have my sitting up sideways on the floor.
I also find the UPS with server power outputs and /or 1500VA and bigger UPS sell for larger discounts because nobody knows what those power points are and nobody actually need that big of a UPS. In addition, when you get over 2000VA+ they'll need 15amp powerpoint (which no normal home would have) plus the batteries on those start adding up ask you'll need at least 4 x 9Ah batteries in a 24/48V configuration.
The expensive ads generally won't sell for a long time and you just msg them once every other week until they drop the price to $50 or whatever you're happy to buy it for. if there's 4 batteries in there and it powers up, the batteries alone would be worth $50-100 so if you can buy it for the cost of the batteries, that's a good deal.
most small UPS (<1500VA) sell for around $50-100 if they have batteries that work, <$50 if batteries are dead.
look for the server ones because they tend to have 4 batteries in there.
I bought a 600 VA modified sinewave one for $10 because the guy didn't know how to change a fuse
I bought a 600 VA modified sinewave one for $50 with a new working battery (keep in mind the batteries are worth about $20-30 a piece)
I bought a 1500 VA APC smart UPS pure sinewave for $30, batteries inside was leaking.
the UPS secondhand market is horrific!
I see people trying to sell brand new UPS with receipts and they will be very lucky if someone buys it from them for 50% of what they bought it for.
For everyone asking how much of a UPS they require but do not want to go through high school physics you can use the below links (they even given suggestions on what is ideal and what is minimum recommended):
https://upsselector.eaton.com/Load
https://www.apc.com/shop/au/en/tools/ups_selector/
One thing to remember is that batteries lose charge/ degrade over time, the bare min specs today might only last a few years.
Would someone expect a 700VA UPS, fully charged to /naturally dissapate 95% of the entire battery/ when unplugged nothing in it, over the course of only 48 hours?
Yes if the batteries are approaching end of life.
It's all good, I've googled this, they do naturally dissipate, unsure why.
If the batteries are healthy, they'll hold charge with the power off for a long time - I have a UPS in my basement that's regularly powered off for months at a time, and it only needs a slight charge when I power it on đź‘Ť
Obviously if you're leaving the UPS physically powered on then it's going to empty the batteries pretty quickly if it's got no incoming power. You need to actually switch it off to prevent power use.
@Nom: Yeah I am now concerned about it actually, I did a full 8 hour charge on the thing and left it off only 2 days, it lasted 15 seconds, after being plugged in for 2 minutes.
I assumed it had some kind of dissipation routine, after googling a second time and reading closer, it doesn't seem good.
I don't suppose you know what all the front numbers mean?
I plugged it in for about 5 minutes it said 2% charge.
Output:
56 VA
11 Kw %
8% VA
0.042 Kw
I'll check it once she's been on 8 full hours.
But would I be right in thinking those are acceptable numbers? I only have
DSL modem
Wifi AP
8 Port switch
65W little mini PC
@hamwhisperer: Sorry I don't quite understand what you mean by "left it off only 2 days".
Once you plug in your UPS to charge, and you connect your devices to it, then it's designed to be left on permanently. You shouldn't then be switching it off - as long as the batteries work during a power cut and then recharge OK when the power comes back on, everything is fine.
What is the scenario where you need to cut power to the UPS for 2 days ?
EDIT : Are you saying you switched off the power and left the UPS powering those four devices for 2 days ? If so, then you're doing very well to get to 2 days, I would expect the battery to be flat long before that…
I picked up a CyberPower and it trips my breaker.
Got an APC, doesn't trip breaker.
@Nom: A good UPS you can run at the rated power, like I said my larger APC unit is rated at 600W with bigger batteries and you can fully run it at this rating. If you can't run this at 960W then it's not a valid rating. Note they don't say anything about it being a peak for 5 seconds or anything like that. If they did then it might make more sense.