I just ordered one of this https://www.aliexpress.com/item/32914162581.html and another the same but 12V for the router. I will make sure they don’t get hot before I trust them.
I’m using ups that’s similar to usual power strip but a bit thicker. Does magic for this small devices like router, homey, switch ap and similar.
Good find! I just ordered the same here:
Don’t forget the adapter
GOOD suggestion!! Ordered right away
Im currently using this power supply https://www.meanwell.com/webapp/product/search.aspx?prod=ADD-155 that is build in small rack together with modem, switch and NAS.
I do have modem, Wifi router, NAS, Homey, wall tablet and Ikea hub at the same place and all of them are being powered by this power supply. Additional benefit of it, is power backup attached battery (Im using sealed 12V/6Ah battery) connected to this power supply directly.
no UPS needed (2 hours without power tested yesterday and it still was running, can be extended with bigger battery).
stable power supply for USB devices (total 3A) and 12V powered devices (max 12A) = no need of 6 standalone power supplies.
smaller overall consumption (compared to previous setup - 20%).
Well, you just built one yourself
Only benifit I actually see in above diy ups is possible increase in efficiency as you do not use 4 or so adapters rather one bigger. Other from that small brick ups like bu600e stars from 50eur.
Yes, but small 50€ UPS you mentioned will last max 40 minutes in my setup (50W load). Had this solution before with APC UPS and after 2 years it was KO (electronic) and also battery from it was unusable.
With 12Ah battery for 30€ I do get 3 times longer operation. And additional benefit not mentioned above is rock solid power output from certified power supply.
Hi i got one of these works perfekt for a little time.
Nice and small, what the estimated uptime on this one?
Entirely depends on the mAh rating of the 18650 cell that you put in it.
Assuming that Homey uses about 750mA on average (which is a wild guess), and you use a 2500mAh cell, you should be able to get about 2500/750 ~ 3 hours.
yes but this will never be a UPS solution as such, the battery being not made to be charged and discharged constantly at the same time. I would advise you to review what Arduino people develops as backup power supply; At my side after some review, I decided to go for the solution suggested earlier in this thread by @Igy meaning a true switching power supply combined with an UPS mechanism which is connected to a solid 12V sealed battery. I ordered the ADD-55 (instead of the ADD-155 selected by Igy as he requires more power) because it is enough power for me and cost less; I also ordered a 12V 4.5 Ah battery; The benefit is that Wifi and internet connection could be secured at the same time in case of power outage, also the stability of this type of power supply is much better. Once implemented I could document more about its actual outcome …
As promised, please find sone results regarding one potential UPS solution… and below some pictures for illustration. Please don’t hesitate to provide feedbacks relating to your own experiences.
Nota bene: I am hiding my homey in a closet for many reasons of which security, this explains why in this setup a nice casing for the UPS is not a priority although I already ordered a case for that.
The idea was to target implementing a true UPS solution with best VFM (Value For Money) possible.
Total cost was for me 63€, just below @Ruud_van_Beek cap expressed above in this thread
- Meanwell ADD-55 switching power (55W) 2 Outputs 12V / 2.5A and 5V / 3A
- USB femelle Adapter
- Kraftmax sealed Battery 12V 4500 mAh
first output could be tuned between 11.5 and 13.8V
Second output is fixed =5V, this is the output for your Homey, it is super stable, I measured it during a week and it doesn’t fluctuate at all.
To avoid cutting the USB cable of my homey, I ordered an femelle USB adapter to have a clean connectivity with the switching power output.
The Meanwell ADD-55 incorporates an UPS system, charge the battery with limited current of 0.23A to keep high battery life duration and the battery discharge occurs only during power outage periods …
Power cut simulation
During the cut, The 5v output stays super stable and Homey doesn’t notice anything, the battery takes on nicely. My digital voltmeter doesn’t blink and display a solid constant 5V.
Backup duration testing: more testing to be done on that one, my first test gave me 3 hours of backup before Homey became unresponsive. Of course, it depends on your average Homey current consumption and on battery selected, But here this solution is very flexible, I guess I should have taken a stronger battery but this really depends on your requirement.
Thanks to all people participating in this thread of discussion and in particular @Igy who already implemented this type of solution.
Glad to hear that you decided to use this setup. Please be aware that to effectively charge battery, you need to set 12V output to meet battery specification. In my case its 13,7V. But I do also use 12V output to power router, modem, and NAS. Those devices should handle this higher voltage, but I decided to included also another DC/DC power supply reduction from 12-48V to 12V from meanwell, just to be sure the output is correct.
Thanks for the input @Igy, shame we couldn’t adjust both types of voltage (Output 1 & Battery charge) separately then.
True in my case, the battery would require 13.5 to 13.8 V for regulation standby on charging instructions.
I guess I could optimize my 5V backup, increasing the charging tension then because I adjusted the output 1 to 12V initially.
If the moderator with the attitude was still around he would have changed the topic title. This whole topic has nothing to do with a powerbank from post 2 and down. Can imagine peeps searching for a powerbank and find this topic, all about UPS.
Thought you were a moderator? I changed the title a bit
To be honest, I don’t think a lot of people really mind topic drift. It keeps conversations interesting (just like in real life!) and being able to introduce alternative ways of looking at a particular topic you may be able to help people out anyway.
Strict moderation is a great way to stiffle such conversations, and forcing people to post their questions in very generic topics that are already dozens or hundreds of posts long, which happens often when people ask question about particular apps or devices, is a good way to complete lose track of particular discussion threads (topics within topics within topics).
Thankfully, the search results show context so people searching for powerbanks can cherrypick the posts that actually talk about powerbanks. They’re not limited to just being able to see topic titles.