Router Battery Backup

zubeb

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Jun 19, 2009
Messages
199
Hmm, not convinced by these gadgets, I bought one that has 3X 18650 and it only lasts for 45 minutes on a 5v router that only uses 350mAh on average.

Junk !!!


Maybe I just need to throw out the batteries and buy decent quality batteries.
I have this one too. Will test tomorrow and give feedback
 

Jola

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Sep 22, 2005
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19,449
Tested and it gave 4 hours of backup on my TP Link modem.
Mine must have dud batteries. Will have to install new batteries.

It is new, but I don't trust the warranty on this item.
 

Jola

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Sep 22, 2005
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You sure the batteries are charged up when you start?
Yip, was fully charged.

At the second loadshed for the day, it only worked for 15 minutes, I guess that it wasn't fully charged that time.
 

zubeb

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Jun 19, 2009
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199
I tested another one again and it gave 4 hours backup.
I charged it from 10:30am till 5:30pm - 7 hours. Then turned off the power and the backup lasted till 9:30pm.
Your one must be a faulty unit.
 

friedpiggy

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Aug 6, 2005
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1,160
Ok, I need a bit of help with the maths here. I am wanting to hook my ONT and router up to a ups system but struggling to figure out the size needed on ups.

Router = 9V 0.85A 7.65VA
ONT = 12V 0.5A 6VA

Wanting to have 2.5 hours of backup or longer if possible since in Durban our load-shedding is 2 hours long.

Was looking at something like this, but not sure about how long it would give me or what formula to use to figure that out - https://www.takealot.com/mecer-650va-line-interactive-ups/PLID53811882/reviews/1

Please help.
 
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DaDon

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Sep 3, 2009
Messages
259
Hi folks,

Anyone got a battery backup solution for 19v power bricks?
TiA

Cheers
D
 

Speedster

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May 2, 2006
Messages
9,290
Ok, I need a bit of help with the maths here. I am wanting to hook my ONT and router up to a ups system but struggling to figure out the size needed on ups.

Router = 9V 0.85A 7.65VA
ONT = 12V 0.5A 6VA

Wanting to have 2.5 hours of backup or longer if possible since in Durban our load-shedding is 2 hours long.

Was looking at something like this, but not sure about how long it would give me or what formula to use to figure that out - https://www.takealot.com/mecer-650va-line-interactive-ups/PLID53811882/reviews/1

Please help.
I'm assuming the numbers given are for the power supply, not actual usage (power supplies are generally over-specced). Let's work on 10w usage for the two devices combined. That means you require 25Wh of power for 2.5 hours of use. At 12V, this equates to 2Ah battery capacity which, for lead acid, is 4Ah nominal.

IIRC that ups has a 7Ah battery so you should be good.
 

friedpiggy

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Aug 6, 2005
Messages
1,160
I'm assuming the numbers given are for the power supply, not actual usage (power supplies are generally over-specced). Let's work on 10w usage for the two devices combined. That means you require 25Wh of power for 2.5 hours of use. At 12V, this equates to 2Ah battery capacity which, for lead acid, is 4Ah nominal.

IIRC that ups has a 7Ah battery so you should be good.
Thanks for getting back to me. I took the figures off the back of the devices themselves since my eyes are no longer good enough to read 1pt black text on a black background. Good news on that front then.
 

ginggs

༼ つ ◕_◕ ༽つ
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Anyone got a battery backup solution for 19v power bricks?
 

chickenbeef

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Sep 10, 2008
Messages
8,365
Got my Mini DC UPS (7800mAh) UPS today and tested it with my Ezviz NVR.

Lasted 3 hours and then I plugged it back in as that's good enough for me so it looks like a good buy if you want something compact.
 

DaDon

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Joined
Sep 3, 2009
Messages
259
thanks G

i did read pages back, but guess i'd stop at 51 down to 50...
would this be an ok option for the rain 5g router that has PoE power supply, or should I wait for the 860p ratel...
TiA

Cheers
D
 

brentm

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Joined
Jun 3, 2011
Messages
114
I found myself in a pretty unique postition in that being in an appartment block, I get handed a LAN cable and not a Fibre port. The stuff on the otherside is powered by a gennie and UPS' or something.

Took an older raspberry pi, added a USB wifi dongle, then plugged it into the internet port.
Plugged the Pi into a battery bank, used debain to create a wifi hotspot dongle and used NAT + DHCP, and it works.

It only runs at around 50mbps (The Wifi dongle speed, most likely) and it runs long enough to survive loadshedding and still has some spare power.
My laptop runs long enough as long as I'm not doing something intense, and its better than trying to use my phones internet which dives as soon as loadshedding hits.

When power returns, I swap the WAN cable to the router and plug the power bank back into the modem to charge.

??
Profit.
 

airborne

Honorary Master
Joined
Jul 13, 2007
Messages
10,138
If anyone needs 18650 cells I'm selling a whole bunch, 2hnd but I've checked capacity of them all. It could build a pretty solid battery bank, which is what I was going to do but never got round to it.
 
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