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Who would be interested in a DC UPS for routers and charging phones?

PJtheKILL3R

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Hello guys, from all the loadshedding threads I am considering building little DC backup boxes to power DC equipment.

Each box will have:
5V (USB for charing phones etc) , 12 (Routers) and 24VDC (common voltage used in CPE units) outputs.

Let me know if any of you would be interested.
If enough people are I might build a few.
 

BLaaR

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Raised hand.

I know its early days, but do you have a rough est. on cost ?
 

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What housing would you use? Can you get anything rack mountable? At what price?
 

pXius

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It would have to compete with a normal UPS which I can just plug anything into.
 

joker08

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you have my interest. But put price will be an important factor.
Currently using a standard power bank to power the router and a 3.2Ah battery to power the CPE.
 

PJtheKILL3R

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Something like this ?

Unlike that one, I would provide you with 3 different voltages available (5,12 and 24VDC) and much more capacity.

I am thinking of giving people different capacity options, all the way from 12Ah to 200Ah (Obviously this would affect the chargers used on the inside etc)

For my proof of concept model I will use a 18Ah battery.
Which should keep a standard router alive for at least 10 hours.
Obviously if you add more loads, the backup time will decrease.

The price would be around R1500
It seems like I am a lot of interest on this, so I might end up being able to buy stuff in bulk and assemble from there.
 

PJtheKILL3R

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It would have to compete with a normal UPS which I can just plug anything into.
I would probably include pre-made DC-barrel jack connections so that its just plug and play and people don't get the polarity wrong.
Of course if someone tries to power their 12V router from the 24V side its also going to go up in smoke.
 

pXius

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I would probably include pre-made DC-barrel jack connections so that its just plug and play and people don't get the polarity wrong.
Of course if someone tries to power their 12V router from the 24V side its also going to go up in smoke.
Awesome!
Just keep in mind that some of the higher end routers like the Asus RT5300 runs off 19v.
 

Caliph

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Awesome!
Just keep in mind that some of the higher end routers like the Asus RT5300 runs off 19v.
@PJtheKILL3R , this guy makes a good point. Many Asus routers use this 65W power brick. By rough calculation, your design (18k mAh) will last only 5 hours if this router is plugged in without any other loads.


Eskom might be moving onto stage 8 soon?
 

wes1987

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I have noticed one thing, with regards to this.

The Archer C20 routers supplied with most ISP's actually use a 9V power supply. So just check on this, sticking 12V into it and frying the regulators might not be a great idea.
 

PJtheKILL3R

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I have noticed one thing, with regards to this.

The Archer C20 routers supplied with most ISP's actually use a 9V power supply. So just check on this, sticking 12V into it and frying the regulators might not be a great idea.
@PJtheKILL3R , this guy makes a good point. Many Asus routers use this 65W power brick. By rough calculation, your design (18k mAh) will last only 5 hours if this router is plugged in without any other loads.


Eskom might be moving onto stage 8 soon?
You guys are right, a pack like this would require the user to know exactly what he is powering and to be sure that he uses the correct voltage.
I could easily install a buck-boost converter and have to user dial it into whatever voltage he needs on say the 3rd DC output.

So your output options could be : 5V (USB) , 12V and then 6-40VDC adjustable by you.
 

PJtheKILL3R

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@PJtheKILL3R You made any progress on this?
Hello there, I am still figuring out how am I going to make it intuitive enough that users don't accidentally fry their equipment.
The DC only idea albeit very efficient places a lot of onus on the user to know what voltage his equipment uses, and if you get it wrong, poof...
 

P1000

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Something like this:
?
 

PJtheKILL3R

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Something like this:
?
Yes but just with bigger LA batteries.
That 860P model according to its spec sheet can provide 40W for 5 hours, so its 200Wh of storage.
Like a few members on here pointed out modern routers could hit 65W, which I also think surpasses the limit of that unit, since it says 60W output.

But for most people that unit should do perfectly fine.
 

PJtheKILL3R

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@PJtheKILL3R Would it be easier for people to tell you what voltage ups they'd need from you? Or are you planning on just making 1 generic model?
It would help for sure, but then it might become a bit of a chore since every box would be custom made, but not a bad idea.
 

wes1987

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I think maybe selling them as options. for instance, 9V output or 12V output could also be a way to go.

That way you can just adjust the buck regulator to suit, then hot glue the pot (or even resolder a fixed resistor) for the requested voltage.

for the 19V units, you could buy 24V batteries and use though, buy then charging becomes harder.

If you interested I could help out, I have lots of electrical knowledge.
 

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Why not just provide a 2/3 pin plug so they can plug the AC/DC adapter in? No need to worry about varying voltages, mistakes, etc. Offer quick charge USB 5v and 220v AC. It would be a UPS combined with a power bank, rather than a bench power supply with battery. I'd say safer and easier.
 

PandaAttack1

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Will this be able to function as an ups? I would be interested in something like this to permanently run my 3D printer through...
 

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