Who's game for a DIY Router UPS / Cell Charger build Project.





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  1. #1
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    Default Who's game for a DIY Router UPS / Cell Charger build Project.

    Who's game for a DIY Router UPS / Cell Charger build.

    Lovely device.

    1/. Charge Mini UPS from any USB charger cable.

    2/. Use Mini UPS to charge your cell phone/iPad/Tablet etc. AND Use Mini UPS as a full UPs for either a 12V or 9V Router. (or either voltage or even both voltages at the same time)
    Cheers

    ZS5KAD
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  2. #2
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    Default Re: Who's game for a DIY Router UPS / Cell Charger build Project.

    This is the ideal way of charging. I have some camping led lights working like this plus it has a solar panel on top of the light. How about someone adding a circuit how to charge say 3xLi-Ion in series in one go. May be included a balancing portion. Cell phones and routers will work very well on 11.1V. Less losses than to boost 3.7V to 12V I think?

    The only drawback using the cell charger again would be the charging time.

  3. #3
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    Default Re: Who's game for a DIY Router UPS / Cell Charger build Project.

    I'm game for it.

    But no1 poses a slight problem for me. Adding components that will drop/boost and power something is easy because you get smart circuits that cost next to nothing. The charging part is tricky.

    I gave it some thought in the past but could never answer my self hopefully you guys can.


    I have a couple of 18650's which I'm not using. I salvaged them from old laptop battery packs.
    And I had to charge them using a NiteCore Lithium cell charger. 2 at a time. Taking a rough under estimated guess they are 2000 mA/h each. 3 sets of 4 cells (3.7v each) in series gives 6Ah ?


    Attachment 551221

    I used it only once when I went camping to power a small LED bar and they still seem ok. Charging them 2 at a time is going take ages.


    I have one or 2 of the below boards somewhere. They are meant to charge 1 x 3.7v cell only. And they work quite well I have used one of them to charge a vape battery for ages, until I managed to swop the pos an neg by accident.
    Attachment 551224

    at 45 bucks a piece buying a couple is not going to be cost effective.


    Say you use a 12v lead acid or gell battery, where would you get a step up converter that will be able to also charge the battery correctly.
    Also If you say charge from "Any" usb charger. By standard a computer USB port has a 500mA limit. and the most i have seen on mini USB cell phone chargers are 2.1A and apparently the USB implementer forum set a minimum of 3A on USB cables for USB type C. Maybe USB type C is an option. So can you charge a 6/7Ah battery using a charger that can provide 2.1 A ? how long will it take ?
    Last edited by SBSP; 2019/12/18 at 08:38 PM.
    JK 3.8L 2010 Rubicon Manual 2 door

  4. #4
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    Default Re: Who's game for a DIY Router UPS / Cell Charger build Project.

    im in

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    Default Re: Who's game for a DIY Router UPS / Cell Charger build Project.

    Het vandag n powerbank gemod om gewone 18650 battery te vat. Holder was R25,en battery was R120.daar is plek vir 3 holders

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    Default Re: Who's game for a DIY Router UPS / Cell Charger build Project.

    [QUOTE=Fluffy;4290996]Who's game for a DIY Router UPS / Cell Charger build.

    Lovely device.

    1/. Charge Mini UPS from any USB charger cable.
    /QUOTE]
    Why not a 12V charger?
    USB is 5V so to charge 12V batteries will require a boost converter..
    Better to work at 12V to start with??

  7. #7
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    Default Re: Who's game for a DIY Router UPS / Cell Charger build Project.

    [QUOTE=Richard Mackay;4291107]
    Quote Originally Posted by Fluffy View Post
    Who's game for a DIY Router UPS / Cell Charger build.


    Better to work at 12V to start with??
    My experience with boosters have been that they are very inefficient - even as low at 60%. 11.1V for 3x18650 can also work but one will have to charge at a higher than 0.5A level with added protection.

  8. #8
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    Default Re: Who's game for a DIY Router UPS / Cell Charger build Project.

    [QUOTE=Richard Mackay;4291107]
    Quote Originally Posted by Fluffy View Post
    Who's game for a DIY Router UPS / Cell Charger build.

    Lovely device.

    1/. Charge Mini UPS from any USB charger cable.
    /QUOTE]
    Why not a 12V charger?
    USB is 5V so to charge 12V batteries will require a boost converter..
    Better to work at 12V to start with??
    Why not a 12V charger ?

    Because everybody has half a dozen 220V to USB chargers lying around, and USB points in their cars or somewhere. USB is the defacto standard universal charging system for small items, power banks etc.

    This device is essentially a power bank with an additional 12V output.

    5V to 12V boost converters cost less than a connector alone for 12V.

    If you have a 12V battery you have to reduce it to 5V anyway.

    The 5V USB charge circuit has all the electronics for proper charge of the battery and over/under charge protection.

    Circuit in twenty minutes when I get out of the bath.
    Last edited by Fluffy; 2019/12/18 at 10:58 PM.
    Cheers

    ZS5KAD
    3 V8's
    NA TwinTurbo SuperCharger
    A V6 and an inline 4

    The frogs are starting to notice that the water is getting warm but it is already too hot to do anything about it.....

  9. #9
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    Default Re: Who's game for a DIY Router UPS / Cell Charger build Project.

    [QUOTE=ekkekan;4291122]
    Quote Originally Posted by Richard Mackay View Post

    My experience with boosters have been that they are very inefficient - even as low at 60%. 11.1V for 3x18650 can also work but one will have to charge at a higher than 0.5A level with added protection.
    60% huh ?

    An inverter is a boost converter and high 90's % is order of the day.
    Cheers

    ZS5KAD
    3 V8's
    NA TwinTurbo SuperCharger
    A V6 and an inline 4

    The frogs are starting to notice that the water is getting warm but it is already too hot to do anything about it.....

  10. #10
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    Default Re: Who's game for a DIY Router UPS / Cell Charger build Project.

    Here we go

    https://www.instructables.com/id/DIY...-Router-Modem/

    Not my design - just something I found that looks interesting.

    All the parts are available in SA.
    Cheers

    ZS5KAD
    3 V8's
    NA TwinTurbo SuperCharger
    A V6 and an inline 4

    The frogs are starting to notice that the water is getting warm but it is already too hot to do anything about it.....

  11. #11
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    Default Re: Who's game for a DIY Router UPS / Cell Charger build Project.

    Quote Originally Posted by Fluffy View Post
    Here we go

    https://www.instructables.com/id/DIY...-Router-Modem/

    Not my design - just something I found that looks interesting.

    All the parts are available in SA.
    Interesting to see what converters are used and also that Panasonic make a 3400mAh 18650 battery. Wonder what they cost?

  12. #12
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    Default Re: Who's game for a DIY Router UPS / Cell Charger build Project.

    V2 of this must be able to take a small 19V solar panel that can be used to charge the battery or run a router at the same time.
    JK 3.8L 2010 Rubicon Manual 2 door

  13. #13
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    Default Re: Who's game for a DIY Router UPS / Cell Charger build Project.

    Would this be cheating?

    Only 160 bucks. batteries not included

    https://www.robotics.org.za/PSB01012B?search=charger

    Click image for larger version. 

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    Quick Spec

    • Maximum 1A load output
    • Battery and Solar panel connector is JST 2.0
    • Stable 5V USB power supply regardless of source
    • Charge/Recharge algorithms built into chip
    • Charge Lithium Polymer Battery through solar power or USB
    • Stable supply voltage through either lithium battery or USB
    • 2 x USB ports let you program your kit while charging your Lithium battery
    • LED indications for battery full or charging states
    • One red alarm LED and one green status LED
    JK 3.8L 2010 Rubicon Manual 2 door

  14. #14
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    Default Re: Who's game for a DIY Router UPS / Cell Charger build Project.

    Coincidence? Last year I bought a 1200VA UPS to power our Hawuei B618 Wifi Router during loadshitting. Two weeks ago I noticed that it only lasts about 45 minutes and turns off. But I thought that the recent series of loadshitting did not allow it to charge properly. This past week-end we had an hour power-out. I timed the UPS just by chance and in less than 35 minutes it was dead as a mossie. We did not have any load-shitting the week before so is realized that the UPS was damaged. Got the invoice, one year guarantee, date on invoice....12 December 2018. Took it to the supplier who confirmed the warranty expired, but they will see if they can help. Not keeping my breath.

    In the meantime if found this:

    https://www.geewiz.co.za/ups/68269-m...+12V&results=5
    One of the stupid mistakes in life is to underestimate peoples level of stupidity!

  15. #15
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    Default Re: Who's game for a DIY Router UPS / Cell Charger build Project.

    I started a thread a while back where I asked what would be a good starter project to dabble in electronics. I wanted to make something useful. I considered a mini boom box. Those small compact speakers gizmo that can run via blutooth from your phone at braais etc.

    This also looks useful. I would like to try.But it looks like I would have to buy a 3d printer. I am electronically challanged so if I look at the battery it is only 3,7v. Dont you need more juice to run stuff.?Could you use more batteries with the same components.

    Looks like the internals could fit in a common plastic 4x2 junction box used in house wiring. If you need more space a 4x4 could be used and then I dont have to buy a 3d printer.

  16. #16
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    Default Re: Who's game for a DIY Router UPS / Cell Charger build Project.

    Quote Originally Posted by Fluffy View Post
    Here we go

    https://www.instructables.com/id/DIY...-Router-Modem/

    Not my design - just something I found that looks interesting.

    All the parts are available in SA.
    Sounds good fluffy but do you think it can be designed to last for 4 hours of load shedding?
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  17. #17
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    Default Re: Who's game for a DIY Router UPS / Cell Charger build Project.

    Quote Originally Posted by ViperR View Post
    Sounds good fluffy but do you think it can be designed to last for 4 hours of load shedding?
    You need a proper battery:
    Attached Images Attached Images  

  18. #18
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    Default Re: Who's game for a DIY Router UPS / Cell Charger build Project.

    Quote Originally Posted by ViperR View Post
    Sounds good fluffy but do you think it can be designed to last for 4 hours of load shedding?
    Not sure if my calculation is right

    18650 batteries are typically 3.7V and 2900mAh. So it will provide 2.9A for 1 hour.
    If you put 4 of them in parallel you have 15.6Ah.

    However it's 2.9A at 3.7V when you step it up or down it has a seesaw effect. Voltage up, current down or voltage down current up (when using a dc/dc , buck/boost converter)
    We are stepping up so the current is going down.

    we need 3.2 18650s to get to 12V.

    So in the end 15.6Ah divided by 3.2 = gives you 4.8Ah . To be on the safe side deduct another 10% because the boost converter need power to run and is not 100% efficient.
    That's 4.3 hours at 1A using 4 18650 batteries in parallel.

    Can we then establish a rule of thumb that says 1 x 18650 battery gives 1hour of standby at 12V

    Taking a wild guess the router will draw 500mA so you could get 8.6 hours out of it ?

    I feel like i made an error somewhere Sounds too good to be true ?
    JK 3.8L 2010 Rubicon Manual 2 door

  19. #19
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    Default Re: Who's game for a DIY Router UPS / Cell Charger build Project.

    As Fluffy says rather work in Watt hours. (and ignore the conversion efficiency for now)
    So a single cell is 3.7V x 2.0 Ah = 7.4 Wh
    A 7Ah SLA battery is 12Vx 7.0Ah = 84 Wh

  20. #20
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    Default Re: Who's game for a DIY Router UPS / Cell Charger build Project.

    Quote Originally Posted by Richard Mackay View Post
    As Fluffy says rather work in Watt hours. (and ignore the conversion efficiency for now)
    So a single cell is 3.7V x 2.0 Ah = 7.4 Wh
    A 7Ah SLA battery is 12Vx 7.0Ah = 84 Wh
    thanks makes it much easier!
    JK 3.8L 2010 Rubicon Manual 2 door

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