wingnut771
Honorary Master
Just make sure the voltages are the same before attempting to connect to each other.
I would feel safe at around 12.5V. -
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Router Battery Backup
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I would feel safe at around 12.5V. Sideshow Bob
Honorary Master
Last August, I bought 2 of these (one for router & other for ONT) and both used to last for more than 4.5 hours.I have done it with a small PSS UPS and this VERTIV:
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The VERTIV seems to have a timer build in that only allows to run for about 2 hours. This can help prevent the battery from draining completely but wont be useful if you would like to run something from it for longer than 2 hours.
One of them now just lasts for 2 hours so I bought other unit and then returned same day as it lasted for 2 and now the latest one also lasts for more than 4.5 hours.
Considering price & quality of these units, I have resigned to buy these units every year so cost is about 4 rand per day, which is bound to go up with escalation of prices.
Mini UPS
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Earlier, I had Mecer UPS that worked well for router & ONT (4 hours plus backup) but after 2 years, that also went kaput. That cost me 1800 for 2 years so cost per day was 2.5 rand.
Hi guys
I've had One of these for a couple of years. The battery is only lasting about 3 hours now whereas it used to last about 8. Is it a really stupid idea to get one of these to use as a power supply to power the ups to give it a bit more run time? Is there any issue in "daisy-chaining" mini upses if the voltages are all correct?
I've had One of these for a couple of years. The battery is only lasting about 3 hours now whereas it used to last about 8. Is it a really stupid idea to get one of these to use as a power supply to power the ups to give it a bit more run time? Is there any issue in "daisy-chaining" mini upses if the voltages are all correct?
wingnut771
Honorary Master
I think 19V is pushing things. Maybe do it at that voltage for 30 mins max or until battery gets hot.
airborne
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Or do it outside so when the battery explodes nothing is damaged by battery acid.
No issue
It will work as long as the voltages stays the same. You can also replace the 18650 batteries in the old unit with bigger capacity and better quality ones for about the same price as the mecer ups adapter.
It will work as long as the voltages stays the same. You can also replace the 18650 batteries in the old unit with bigger capacity and better quality ones for about the same price as the mecer ups adapter.
Thanks, but I'd probably stuff that up. I also don't have a soldering iron (I'm assuming soldering would be involved).
Yes there will be some soldering involved for the wires not really for the cells. Proper way would be to spot weld the cells together.
Chaining them should be ok as long as you keep the required input voltage and current the same. I've done it myself.
The second one that you linked has a pretty small battery so don't expect it to help much. You can get one with a 8000mha battery for not much more.
Something like this may be an alternative: https://www.electromannsa.com/produ...18650-battery-with-bms?variant=42939432698097
Then you don't have to spot weld the wires to the cells.
wingnut771
Honorary Master
I assume they can be paralleled?
Last August, I bought 2 of these (one for router & other for ONT) and both used to last for more than 4.5 hours.
One of them now just lasts for 2 hours so I bought other unit and then returned same day as it lasted for 2 and now the latest one also lasts for more than 4.5 hours.
Considering price & quality of these units, I have resigned to buy these units every year so cost is about 4 rand per day, which is bound to go up with escalation of prices.
Mini UPS
Buy Mini UPS online at the Best Prices! Door to Door and Overnight Delivery. Voted the best online store in SA. View Here
Earlier, I had Mecer UPS that worked well for router & ONT (4 hours plus backup) but after 2 years, that also went kaput. That cost me 1800 for 2 years so cost per day was 2.5 rand.
I have some of those lithium mini ups units to run my WiFi and Internet connection.
I use the UPS's with the securi prod lithium batteries to run small AC powered devices like a printer, computer monitor, desk lamp etc.
Will have to wait and see how long they will last in the long run...
No idea. You can probably get them without the BMS as well. I haven't spent much time looking into this yet.
I did see that they have some already connected up in parallel as well.
unlikely. Would depend on the BMS.
wingnut771
Honorary Master
I don't think it matters with parallel, series yes.
If you are really desperate those will work. LOL 10 000mah cell with a actual 600-1000mah capacity if you are lucky
Thanks, so if I understand right, any ups with the right voltage will work? Such as Like this ?
Yeah I am pretty sure that one will work as long as the connectors are the same.
Yours https://www.geewiz.co.za/ups/126072...th-splitter-cable-psu-cable-not-included.html requires an input of: 12V 2000mA the one that you just linked to has the same output.
I am no expert but I would try to keep the input voltage the same and the input current (amps) the same or slightly more.
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Nah, current doesn't matter. Just make sure the Volts match. The device will draw (pull in) as much current as it needs, however your PSU will PUSH as many Volts as it can.
So too much V will blow it, too much A won't do anything.
(Edit: in fact using less amps than the supply is rated for will save battery life)
But the current would matter when it wants to draw more than you have available, right?
Lets say it can recharge at 12V, 2A so 24W but you give it 12V, 1A so 12W. It will recharge at 1/2 the speed that it is capable off.
And then lets say the device that you plug into needs 24W, you'll drain it faster than you charge it...
This is why I say the "same or slightly more" current than what is required.
Some people use split cables on these ports . If you split them, I guess the voltage stays the same but the current is split between the 2 devices if the 2 devices both pull the same amount of current. Is this correct?