UPS backup Power for ADSL modem

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dotcat

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So due to load shedding I need a solution to power my adsl modem for the 2.5 hrs that the power is out.

If i get a 600VA / 360W UPS how long will it be able to supply the modem with power if it draws 230V at 140mA?

Im struggling to get the equation right.

Thanks!
 
dotcat said:
So due to load shedding I need a solution to power my adsl modem for the 2.5 hrs that the power is out.

If i get a 600VA / 360W UPS how long will it be able to supply the modem with power if it draws 230V at 140mA?

Im struggling to get the equation right.

Thanks!
Click to expand...

LOL - I am also thinking on those lines. that UPS is a Makro item right? I got one for my desktop but will be getting the 1000VA for the desktop and put the 600 on the ADSL modem as well.
 
Not actually - But thanks!! I hadn't looked at Makro yet!
 
Do you even get a ups that will run a pc for 3hours +-? The only psu's i see that are capable of this will cost you over R20k. And they are BIG! The small ups devices will only supply enough power for under an hour! My VERY old ups that i have can only supply enough power to my pc with a 800watt psu for me to shut it down just as the power goes down. Think at most i get about 10mins out of it..
 
Wait you only want to power the ADSL modem?

Because if it is a 12volt model (IE. The AC->DC adapter is a 220v AC -> 12v DC model) you can probably get more time by buying a 12v 45Ah car battery (they're cheap around R200) and a charger for it. Then you'll get around 45 hours.

EDIT: Most electronics shops like Electronics 123 & Communica sell chargers for 12v batteries. The people at Electronics 123 don't know **** about electronics so my advice is to go to Communica, assuming you're in the Gauteng region.

EDIT: If the modem is a 9v model it'll work also, most AC/DC adapters (about 95%) aren't regulated and therefore when you set it to 9v you probably get around 14volts which is then regulated by the modem (using a regulator IC), it's also quite simple to build a regulator for 12volt down to 6v,5v,3v, etc...
 
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Gnome said:
Wait you only want to power the ADSL modem?

Because if it is a 12volt model (IE. The AC->DC adapter is a 220v AC -> 12v DC model) you can probably get more time by buying a 12v 45Ah car battery (they're cheap around R200) and a charger for it. Then you'll get around 45 hours.

EDIT: Most electronics shops like Electronics 123 & Communica sell chargers for 12v batteries. The people at Electronics 123 don't know **** about electronics so my advice is to go to Communica, assuming you're in the Gauteng region.
Click to expand...

If it's 12v then that will be the cheaper option to take :)

Just remember to plug your switch into the battery as well ;) (if you have a switch on your network as well)
 
I am also running the ups setup at one of my branches.

The power dips quite alot and then the adsl router switches of and back on. Now with a ups on the router all is well

Works Good
 
OK so far powering switch and modem 56 minutes...

it's now past the 2hr mark and the beeping is getting to me so im plugging it back in...
 
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dotcat said:
OK so far powering switch and modem 56 minutes...

it's now past the 2hr mark and the beeping is getting to me so im plugging it back in...
Click to expand...

How did you change the plugs on the router and modem?

The UPS has those 'kettle' female plugs at the back and comes with the cords (female at one end and male at the other) to fit into the UPS and the back of a PC/monitor.

I haven't been able to find any of those male plugs which one can put onto the modem/router power cable.
 
Go to Game, Dion, local hardware store. Buy a female Janus plug (double sided female). Go to local PC shop get the cord for the monitor that gets power from the PC PSU. Cut the female side (that goes to the screen) about 5cm from the end, to use it in future. Fit the Janus plug (double sided female) to the point where you removed the female side (that goes into the screen).

Now you'll have two 3 point plug from your UPS to your PC, ADSL Modem/Router, printer, Hi-Fi, etc. - everything you want to connect to your UPS.

I am running the above mentioned set up on 3 different systems, each with a different equipment on it.
 
thanks - I was off sick today (bloody cold) and did just that - running the router and adsl off it now - also got a 1100va connected to my iMac.

I like the thought of putting one on my TV and Pvr. Wonder how long it will run off the batteries - got a 37inch LCD panel.
 
Another option is to purchase an USB ADSL router, and keep it on standby, so should the power goes off, you just plug into the USB ADSL router (on your laptop) and continue as normally, on laptop power as well.
 
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