Router Battery Backup

The better solution is one that controls the load through a relay. This system should be okay if not ideal provided the combined current required to maintain the battery at full trickle charge plus the load current is less than 1.5 A. The problem is the "intelligent" charger will not function as it should when only connected to a battery.
It would be better to only connect the router to the battery when required, and disconnect the charger if you don't do some experiments to determine what the charger will do when connected to the load.
 
Geoff.D said:
If possible post the manual so that we can see what the real specs are.
Click to expand...

Here you go:
https://www.perel.eu/downloads/200/ac028a7v01.pdf

Thanks so much super appreciate the assistance! Also what experiments are you referring to doing?

Summary from website not sure if this helps or means anything

Features
  • 3-step fully automatic charging cycle
Specifications
  • rated input voltage: 220 - 240 VAC
  • frequency: 50/60 Hz
  • rated output current: 12 VDC, 1.5 A
  • dimensions: 72 x 147 x 42 mm
  • weight: 376 g
  • IP rating: IP65
  • battery type: lead-acid batteries only (gel, AGM, EFB...)
  • rated current: 0.25 A
  • cable length:
    • mains cable: 1.5 m
    • charging cable: 1 m
 
This charger may not be able to sense when the battery is fully charged if it is at the same time supplying the load with power.
The risk is therefore of overcharging the battery.
To try and determine the risks, you would have to measure the actual router current drain.
 
Geoff.D said:
This charger may not be able to sense when the battery is fully charged if it is at the same time supplying the load with power.
The risk is therefore of overcharging the battery.
To try and determine the risks, you would have to measure the actual router current drain.
Click to expand...
Ah I see, to be honest its not worth it then, esp for just this one item. Will rather switch on as needed. Thanks for your advice!
 
joker08 said:
how do you charge the batteries ?
Click to expand...

d78234b65276464c04862271c0aa0a39.jpg
 
joker08 said:
cost of the charger ?
Click to expand...
Can't recall - I bought it last year to charge my car battery. Probably a couple hundred rand?

Apart from the battery I used stuff I already had lying around.
 
I went to Communica Midrand on Monday and bought the CCTV Power supply box, a 12V7aH battery, 2 x 2.1x5.5mm adapters that plug into my two routers(CPE and router for Fibre) and a DC/DC buck voltage regulator to drop the voltage for the one router to 9V and some wire to connect it all. All in all was around R670.

Connected everything yesterday, but the voltage regulator didn't want to work, so I used another available fixed DC/DC regulator 12V to 5V and hoped and prayed that it would work on my 9V modem.

Plugged it in and all worked perfectly. Kept both my routers alive during load shedding last night as well as this morning. The only thing that irritated me was the double beep every 30s when power is off. But inside the PSU unit there are two wires that you can short out to disable the beep which I did and it also worked perfectly.

Hopefully the battery will last with the constant load shedding and hopefully the battery gets time to charge before the next load shedding kicks in. These are the items I bought:

http://www.communica.co.za/Catalog/Details/P0726831591
http://www.communica.co.za/Catalog/Details/P0080909160
http://www.communica.co.za/Catalog/Details/P2437741583
http://www.communica.co.za/Catalog/Details/P0897549834 (didn't want to work)
Some wires to connect all up.
 
phillyza said:
I went to Communica Midrand on Monday and bought the CCTV Power supply box, a 12V7aH battery, 2 x 2.1x5.5mm adapters that plug into my two routers(CPE and router for Fibre) and a DC/DC buck voltage regulator to drop the voltage for the one router to 9V and some wire to connect it all. All in all was around R670.

Connected everything yesterday, but the voltage regulator didn't want to work, so I used another available fixed DC/DC regulator 12V to 5V and hoped and prayed that it would work on my 9V modem.

Plugged it in and all worked perfectly. Kept both my routers alive during load shedding last night as well as this morning. The only thing that irritated me was the double beep every 30s when power is off. But inside the PSU unit there are two wires that you can short out to disable the beep which I did and it also worked perfectly.

Hopefully the battery will last with the constant load shedding and hopefully the battery gets time to charge before the next load shedding kicks in. These are the items I bought:

http://www.communica.co.za/Catalog/Details/P0726831591
http://www.communica.co.za/Catalog/Details/P0080909160
http://www.communica.co.za/Catalog/Details/P2437741583
http://www.communica.co.za/Catalog/Details/P0897549834 (didn't want to work)
Some wires to connect all up.
Click to expand...
Exact items I was looking at. Except the buck regulator.
Wonder if I should do it. Money money money.....
 
so what would the variable buck regulator not work? The imput should have been set to 12V and the output adjuted for 9V? Should ahve been trouble free? Sure the grouding connection was correct?

Long term you are pushing the router a bit by trying to drive it with only 5V.
 
Geoff.D said:
so what would the variable buck regulator not work? The imput should have been set to 12V and the output adjuted for 9V? Should ahve been trouble free? Sure the grouding connection was correct?

Long term you are pushing the router a bit by trying to drive it with only 5V.
Click to expand...
I have no idea why it didn't work. It has got two inputs negative and positive on the one side and two outputs positive and negative on the other side. And a potentiometer with a little screw that you can adjust. Adjusted the screw but the voltage stayed 12V. Didn't want to drop. Maybe factory fault.
In the meantime I will look at an alternative solution as I understand this might damage the router in the long run.
As a side note I saw YouTube videos where the guy power various routers via a powerbank and USB cable 5V.
 
phillyza said:
Adjusted the screw but the voltage stayed 12V. Didn't want to drop. Maybe factory fault.
Click to expand...
Did you have a load connected? The voltage might only drop if some there's something pulling current. Try an LED and a resistor.
 
ginggs said:
Did you have a load connected? The voltage might only drop if some there's something pulling current. Try an LED and a resistor.
Click to expand...
Aha. Might be that. No, just tested the voltage at the output side. At the 2.1x5.5mm adapter.
 
Check the spec of the router to see what its input voltage and current ratings are. maybe it is flexible enough to be able to run on 5V, then I would not worry.
It is possible that the issue is there must be a load connected, so try that.
 
ginggs said:
Did you have a load connected? The voltage might only drop if some there's something pulling current. Try an LED and a resistor.
Click to expand...
I use an old pc fan. Used to use a buzzer, but then got thrown our of the office
 
Geoff.D said:
Check the spec of the router to see what its input voltage and current ratings are. maybe it is flexible enough to be able to run on 5V, then I would not worry.
It is possible that the issue is there must be a load connected, so try that.
Click to expand...
See pics below
ec76d710be72f301070caf9a2475ef7d.jpg
34d100a24040b674cce805dbac4eaac3.jpg
 
Thanks everyone for the advice, just tested and all is running on all networks as usual.

So my total costs were:
12AH Battery - R600
1.5A Perel intelligent charger - R600

R1200 = peace of mind for a few hours. Can easily upgrade battery size if needed.

If Geewiz timing is anything to go by this should be 16 hours of use. So this is sufficient for my purposes.

IMG-20190320-WA0010.jpg
 
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