Router Battery Backup

Kappie 17 said:
Hi everyone, trust all well. I’d like to setup a UPS to power my fibre router (Tenda AC18; 12V, 2.5A) and ONT (Nokia ONT; 12VDC, 1A). The UPS is 2000VA, output power factor of 0.9 and has 4 batteries (12V, 9aH per). Before Eskom strikes (again) later tonight, and before I connect everything, I wanted to ask whether my calculations below were correct, please?

UPS: 12V x 9aH x 4 = 432 watt hours (not sure if multiplying by # of batteries is correct?)
Router & ONT: (12V x 2.5A) + (12V x 1A) = 42 watt hours

Runtime (50% load) = (432/42/2) * 0.9 = ~4.5 hours

Many thanks in advance.
Click to expand...

I came home on Friday and the power had been off 6 hours and my 2x9ah battery UPS was still chugging along nicely running my Netgear router and the openserve router thing. I don't know how low it was then, not connected to a laptop or PC.
 
Kappie 17 said:
Hi everyone, trust all well. I’d like to setup a UPS to power my fibre router (Tenda AC18; 12V, 2.5A) and ONT (Nokia ONT; 12VDC, 1A). The UPS is 2000VA, output power factor of 0.9 and has 4 batteries (12V, 9aH per). Before Eskom strikes (again) later tonight, and before I connect everything, I wanted to ask whether my calculations below were correct, please?

UPS: 12V x 9aH x 4 = 432 watt hours (not sure if multiplying by # of batteries is correct?)
Router & ONT: (12V x 2.5A) + (12V x 1A) = 42 watt hours

Runtime (50% load) = (432/42/2) * 0.9 = ~4.5 hours

Many thanks in advance.
Click to expand...

So long as the batteries are in parallel, the calcs are reasonable. Are you sure the system is not a 24 Volt system with two "strings" of 2 batteries each?
The pf ? The factor you want is the energy conversion efficiency.
 
Running my 5v router on a cellphone battery pack, and got an el-cheapo 12v gate motor battery and charger from the Chinese shop for the demarc fibre thingy.
 
Converting 12V DC to 220V AC and back to 12V DC is not efficient. I have been running my ADSL router off this 12V UPS I bought at a security shop for R400 for a few years now.

www.communica.co.za

PSU CCTV 12VDC 3A

Power Supply Unit with Battery Backup • 12VDC 3A UPS • with Battery Compartment for 7Ah Battery (Battery NOT Included) Overview Features Input voltage can vary from 90VAC to 265VAC without affecting the output voltage. (output voltage remains constant) Input and output fused Short circuit...
www.communica.co.za www.communica.co.za

I hooked it up to a 45 Ah battery that came out of a UPS instead of the 7 Ah battery that can fit into the case. Also hook 12V lights onto it during load shedding. Easily runs this setup for more than a day.

Changed over to fibre and will run the ONT off it now, but the new TP Link router runs off 9V, so planning to buy one of these:

Amazon.com: Magnolian High Efficiency DC/DC Converter 12V Step Down to 9V 2A 18W Power Supply Module,Waterproof: Electronics

Amazon.com: Magnolian High Efficiency DC/DC Converter 12V Step Down to 9V 2A 18W Power Supply Module,Waterproof: Electronics
www.amazon.com

Then both devices will run off the one UPS, and I will have the 12V lights on as well. Could also replace the battery with a 7Ah lead crystal that you can drain completely without damage. Should also give at least 4 hours of use.
 
Daruk said:
Powerbank.
Just get a 5v voltage regulator and run it off the same 12v output on the other side of the reg.
Click to expand...
Thought of just using one of my many car chargers. Got a lighter socket from autozone for R30
 
Was busy 3d printing a neat little case for the whole thing but then loadshedding kicked in. Gonna need 15 hours of uninterrupted power :(
 
Daruk said:
Here you go... Simple, clean and very efficient. Hardly any wastage like a regular regulator.

TSR 2-2450 | TRACOPOWER Switching Regulator, PCB, 5V dc Output Voltage, 2 A Output Current, 1 Outputs | RS

za.rs-online.com za.rs-online.com
Outputs 5v at up to 2A. Input can be anything from 6.5 up to 36v. Very low heat unlike most regs that just turf excess as heat. This thing has 94% efficiency.
One pin is input +, one is common ground and one is output 5v
Click to expand...

Goodness. No I’ll go ready made solution.
 
Inspired by this thread, I decided to make my own redneck router backup battery yesterday. Gave me around 2 hours of usage before the lights came back on, so I'm chalking it up as a success.

Parts: 3 X 18650's, 2 X binder clips, 2 X old hard drive magnets, some wire, and a barrel connector.

755172
 
3 x no name batteries of questionable wh capacity?
No not a success just an interesting primary school science experiment.
 
  • Like
Reactions: Yuu
furpile said:
Converting 12V DC to 220V AC and back to 12V DC is not efficient. I have been running my ADSL router off this 12V UPS I bought at a security shop for R400 for a few years now.

www.communica.co.za

PSU CCTV 12VDC 3A

Power Supply Unit with Battery Backup • 12VDC 3A UPS • with Battery Compartment for 7Ah Battery (Battery NOT Included) Overview Features Input voltage can vary from 90VAC to 265VAC without affecting the output voltage. (output voltage remains constant) Input and output fused Short circuit...
www.communica.co.za www.communica.co.za

I hooked it up to a 45 Ah battery that came out of a UPS instead of the 7 Ah battery that can fit into the case. Also hook 12V lights onto it during load shedding. Easily runs this setup for more than a day.

Changed over to fibre and will run the ONT off it now, but the new TP Link router runs off 9V, so planning to buy one of these:

Amazon.com: Magnolian High Efficiency DC/DC Converter 12V Step Down to 9V 2A 18W Power Supply Module,Waterproof: Electronics

Amazon.com: Magnolian High Efficiency DC/DC Converter 12V Step Down to 9V 2A 18W Power Supply Module,Waterproof: Electronics
www.amazon.com

Then both devices will run off the one UPS, and I will have the 12V lights on as well. Could also replace the battery with a 7Ah lead crystal that you can drain completely without damage. Should also give at least 4 hours of use.
Click to expand...

Ordered the converter last night, plus another one with USB 5v output. Will build it into a box that will give 12V for the ONT, 9V for the router, 5V USB for charging a phone and another 12V output for lights during load shedding.
 
Right so I went and picked up a Ratel 430P this morning from communica and I must say i'm impressed
https://www.communica.co.za/products/ratel-430p

The specs if anyone is interested https://sinetechstore.co.za/wp-content/uploads/2019/11/OmniPower-Ratel-Micro-UPS-Range.pdf

I ran a Mikrotik router on it (rb2011uias-2hnd-in) during load shedding and it was at 75% after 2.5 hours of use, to see how long it would run for beyond that I unplugged the power, left home got back now and it was only at 50% so yes a good 5 hours shouldn't be a problem at my load.

For the record the router has a max power draw of 11w but even if you add a CPE to this it should easily do 3 hours if not more.
 
Imraank said:
Inspired by this thread, I decided to make my own redneck router backup battery yesterday. Gave me around 2 hours of usage before the lights came back on, so I'm chalking it up as a success.

Parts: 3 X 18650's, 2 X binder clips, 2 X old hard drive magnets, some wire, and a barrel connector.

View attachment 755172
Click to expand...
que macgyver music
 
  • Like
Reactions: Yuu
b1nary said:
Right so I went and picked up a Ratel 430P this morning from communica and I must say i'm impressed
https://www.communica.co.za/products/ratel-430p

The specs if anyone is interested https://sinetechstore.co.za/wp-content/uploads/2019/11/OmniPower-Ratel-Micro-UPS-Range.pdf

I ran a Mikrotik router on it (rb2011uias-2hnd-in) during load shedding and it was at 75% after 2.5 hours of use, to see how long it would run for beyond that I unplugged the power, left home got back now and it was only at 50% so yes a good 5 hours shouldn't be a problem at my load.

For the record the router has a max power draw of 11w but even if you add a CPE to this it should easily do 3 hours if not more.
Click to expand...
Looks pretty decent.
 
You must log in or register to reply here.
Back
Top
Sign up to the MyBroadband newsletter
X