Its predicted that Finland will have rotating power outages next winter due to lack of energy production. The power outages are predicted to last for 2hours a day.
I want to prepare myself for this time as I need my computer and internet connection to do my work.
I am thinking of building specialized UPS for DC power so i can power my cable modem during power outages. Do you think the cable modem network will still work even if there is no power to the building?
I will build multible adjustable DC voltage outputs to the UPS so i can power my two screens as well.
I am thinking of using multible DC to DC converters like in following link. Do you think single one of them can provide enough current for a 24" display?
https://www.aliexpress.com/item/1886880830.html
For the battery i am just thinking 12V deep cycle lead-acid battery.
For control logic I intend to use arduino and is sensing if wall power is provided. If not it would first cut relays to the AC wall power then connected the battery to the loop. Of course I will have AC to DC converter between wall power and UPS. To keep the voltages semi-stable during switching I am thinking of using super caps on the DC side.
Can power travel from DC side of and AC to DC converter to the AC side?
I would be very open for your input what could go wrong with this and if the cable modem network will work during power outages.
>Do you think the cable modem network will still work even if there is no power to the building?
Mine does when the outage is local and my modem is on UPS.
>Can power travel from DC side of and AC to DC converter to the AC side?
In general, no.
Typically your cable modem should still have a connection if it's plugged in to a backup battery.
The arduino is a little excessive, if you use a pure sine wave inverter hooked up to a deep cycle battery, you'll get a similar result.
Here is over all idea of my "UPS". I have ignored the DC ground connections in the drawing.
A) Wall power
B) Cheap 12v battery charger
C) DC relay
D) 12V 60Ah Deep Cycle battery
E) AC solid state relay
F) AC current sensing module
G) DC relay
I) Arduino
H) AC to 12V DC power supply
J-L) DC to DC converters
M-Q) Super capacitor banks.
Of course it needs fuses on all AC and DC inputs and outputs.
I don't want to worry about plugging in and plugging out different wires.
>Typically your cable modem should still have a connection if it's plugged in to a backup battery.
Ex HFC engineer here. That's true until the battery backups on the local nodes run out, same as cellular networks. Fun story, there was a HFC node in the basement of WTC2 that stayed on for almost a week before it failed. Neighborhood ones usually have maybe a couple hours worth of juice, but I've seen shittily maintained ones fail immediately.
>I am thinking of using multible DC to DC converters like in following link. Do you think single one of them can provide enough current for a 24" display?
>https://www.aliexpress.com/item/1886880830.html
yes, but you need to make sure the amperage is doable for your monitor. you also need to make sure that you're not going to cook your shit, so you may have to get some perfboards to make a limiter of some kind (unless yours also has amperage adjustment).
12v deep cycle battery is a good idea, but how are you going to charge it? also, you'd probably need a pretty high milliamp hour battery to support multiple 12v devices.
honestly? just buy an off-the-shelf UPS. you don't want to do it diy and find out you've fried half your shit. diy electronics is great, i'm starting to do some electronic projects right now, but i would never touch anything that has to do with extremely sensitive devices like computers.
Your right, i will just get a off the self UPS and hook up a bigger battery. Thanks sometimes I can think in too complicated ways.
most of them are meant to do that anyway. you're looking at a much larger expenditure for components that are made more safely and more efficiently in a consumer item.
I found an used UPS for 30€/$, i will just hook up a bigger battery to it
It'd be cheaper and far more reliable to buy a regular UPS and maybe swap the battery for a bigger one. That said, if there's large-scale power outage, it's not very likely that your ISP's servers are going to be working, in which case you might as well fork out the $1k for Starlink.
some people would still have power while others don’t, so it’s kinda hard to believe ISPs wouldn’t have a plan to stay powered 24/7 if they didn’t already have some sort of power backup system like almost every modern data center
ISP and phone companies have battery backups on their tech.
>For the battery i am just thinking 12V deep cycle lead-acid battery
you will need 2 to 4 of those (100 ah) for 2 hours at 1500 watts output. then 8 to 12 hours to recharge.
A backup generator would be a wise choice too.
do everything you want but don't say anything to you boss, and when you have no energy just play games with another computer and account.