Router Battery Backup

ebendl said:
Mmm, then I wonder if those "mini UPS" devices that work from a Li-ion battery isn't a better deal. At least Li-ion can handle a larger DOD.

They are definitely more expensive but I have one for my kid's baby monitor and they seem to work well.
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Give us the make and model number please. Yes a higher quality battery will always be an improvement. It is always about cost.
 
Geoff.D said:
Give us the make and model number please. Yes a higher quality battery will always be an improvement. It is always about cost.
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Sorry - they were shared earlier in the thread. https://www.geewiz.co.za/ups/68269-...-power-bank-supply-b315-b618-cctv-router.html

Pretty no-name Chinese though. Banggood also sell them (including a 5v version), although the bigger 12v one isn't shippable to SA: https://www.banggood.com/12V2A-22_2...ecToken=CgEwEAIaAklWIgJQRCgB&cur_warehouse=CN
 
Anybody have a confirmed supplier for the Sherlotronics 3 and 6amp models?
 
Assuming 100% efficiency and a completely flat battery, charged at 1 Amp a 7 AH battery will take 7 hours to charge.
If the charging process is less efficient then longer than 7 hours. If battery is not allowed to fully discharge, less than 7 hours.
 
Geoff.D said:
Assuming 100% efficiency and a completely flat battery, charged at 1 Amp a 7 AH battery will take 7 hours to charge.
If the charging process is less efficient then longer than 7 hours. If battery is not allowed to fully discharge, less than 7 hours.
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At what voltage do you consider the battery to be ‘completely flat’? I’m very hesitant to run mine below 12.2 volts.
 
riscbroker said:
At what voltage do you consider the battery to be ‘completely flat’? I’m very hesitant to run mine below 12.2 volts.
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How do you "stop" the battery from going below 12.2v? I have a battery for my home alarm system but have no idea how to manage / monitor the battery status. I have a suspicion theses long (and regular) load shedding sessions are causing the battery to drain beyond what is ideal
 
PUP Backup said:
Yes I can provide the bigger battery option (18Ah) with external battery.
I think this would be a better option.
With that we'll be ok with the router, Wi-Fi & RP (I will provide a converter to 5V for the RP)
I would like to have the cameras on a separate system..
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Would this work on a 12V ONT 9V Router and 5V RP ?
 
Speedster said:
How do you "stop" the battery from going below 12.2v? I have a battery for my home alarm system but have no idea how to manage / monitor the battery status. I have a suspicion theses long (and regular) load shedding sessions are causing the battery to drain beyond what is ideal
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Yes it is a problem. LS does cause damage to batteries simply because of the risk of discharging the below 20% of its capacity. Mostly alarms systems etc do not do anything to monitor battery health, especially the older systems.
Centurion for example calims they shut down the system when the battery falls to 10.7 Volts. That is way below 20%!

The correct way is to get hold of the battery discharge curve and see what that tells you and then you decide what you are prepared to allow. For low power consumption devices I generally do not allow battery to discharge below 12V ever. (Lead Acid)

The only way to do it properly is with a BMS.
Now that could be expensive for small applications. So what I do is is switch OFF the alarm system if I am at home during LS. I do the same with our electric gate. I disable it and revert to manual operation.

What you could do is check the voltage on the alarm battery under normal conditions, and then at the end of a LS event to see what the voltage is. < than 12V would typically mean the battery is already below 20% of capacity.

Quite distrurbed to see that the el cheapo PSUs referenced in this thread all cut the load at 10V! That is way too low in my book!
 
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jvrs said:
Will just charge longer, it's not like it won't work
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User manual states:
The Battery Charge output is Current limited to approx 1A and is suitable for batteries no bigger than 7A/H
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So yes, obviously it won't know if you have more than one battery connected, but I guess then I might as well consider the bigger brother which was designed for an 18AH battery which I would guess charge at a higher current (nothing in the manual though).
 
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