Calculating Device Wattage and UPS Size

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Guji

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Hi Guys

First up sorry if this may sound like a silly question ... but I need some help, please. With the onset of load shedding again and working from home I am in need of a UPS to keep my laptop and 21inch LED monitor going. Looking at all these power supplies and trying to work out the power draw and what size UPS is required is driving me nuts?

Do I look at INPUT or OUTPUT? If I look at Input it looks like I am going to need a massive UPS.

Please help!!!
 
Guji said:
Hi Guys

First up sorry if this may sound like a silly question ... but I need some help, please. With the onset of load shedding again and working from home I am in need of a UPS to keep my laptop and 21inch LED monitor going. Looking at all these power supplies and trying to work out the power draw and what size UPS is required is driving me nuts?

Do I look at INPUT or OUTPUT? If I look at Input it looks like I am going to need a massive UPS.

Please help!!!
Click to expand...
Why not post the labels on your laptop and monitor? It should be easy enough to determine your power draw from there.
 
You look at output.. there are online calculators, where you input voltage and amp from the power supply, which will give you the wattage at max draw..
 
thechamp said:
Why not post the labels on your laptop and monitor? It should be easy enough to determine your power draw from there.
Click to expand...
Here's the bottom of my laptop and the power adapter for my LED screen which is pretty easy as it says 25w only noticed that now doh!!. The laptop is a bit tricky the power supply sticker is all scratched out
542e7e963e98478c6befc1fa3899e262.jpg
1c3f7d36462e290cbe9bbc9d2b979d03.jpg
 
WAslayer said:
You look at output.. there are online calculators, where you input voltage and amp from the power supply, which will give you the wattage at max draw..
Click to expand...
So what you are saying is if I use the output values from the power supplies on the calculator I will get a rating and I can work out what I need.
 
Laptop is 90W, screen is 25W

Watts = VxA

Best you get a Inverter, UPS isnt really meant as a backup solution, only to shut down the PC once the power is off.

2400VA Inverter is a better choice but all depends on your budget.
 
Guji said:
Here's the bottom of my laptop and the power adapter for my LED screen which is pretty easy as it says 25w only noticed that now doh!!. The laptop is a bit tricky the power supply sticker is all scratched out
542e7e963e98478c6befc1fa3899e262.jpg
1c3f7d36462e290cbe9bbc9d2b979d03.jpg
Click to expand...

Power equals amps multiplied by voltage. Your monitor won’t use more than 28w
 
Rickster said:
Laptop is 90W, screen is 25W

Watts = VxA

Best you get a Inverter, UPS isnt really meant as a backup solution, only to shut down the PC once the power is off.

2400VA Inverter is a better choice but all depends on your budget.
Click to expand...
So I am in for at around R9k then :'(
 
NatalNic said:
Nooit. get a 300w inverter from Midas or ACDC and a small deep cycle battery 50ah from any battery shop. Sorted
Click to expand...
Thanks for this. WIll check with my buddy who has a Midas if he has this in stock? Silly question how would I keep the battery charged though?
 
Guji said:
Thanks for this. WIll check with my buddy who has a Midas if he has this in stock? Silly question how would I keep the battery charged though?
Click to expand...
Get an inverter with a built in charger, I would honestly not go to Midas for an inverter.
 
Guji said:
Thanks for this. WIll check with my buddy who has a Midas if he has this in stock? Silly question how would I keep the battery charged though?
Click to expand...
Look for the black and decker trickle chargers. Its a smart charger as well and wont break the bank.
 
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