Suitable UPS for ASUS RT-AC88U

[plato2322]

Does anyone use or know which UPS (Uninterruptible Power Supply) may be suitable for keeping an RT-AC88U going for 3-4 hours after a blackout? It's 19v and about 3.5a I think.

 

[Jeffrey Young]

3.5 amps is what the supply is capable of at 19 volts DC. You need to look at what the input draw is at 110 volts AC or 240Vac if you're in Europe.

Either way, you may find it hard to find a cheap commercial grade UPS that will last 3 to 4 hours. What I did with mine, is removed the small battery and ran external leads to a much larger battery (20Ah).

 

[plato2322]

Thanks, I'm in Australia so 240v AC. I know Telstra have a Smart 3Gen modem and sell a ups for $120 which they maintain will keep the modem/router going for 3-4 hrs so thought there may be a similar unit that would do my router.. I'm not overly technical so looking for a plug and play rather than get the soldering iron out.

 

[degrub]

Get a UPS with the biggest battery you want to pay for. Make sure it is user replaceable.

@jzchen documented some issues with UPS interference with the radios, if i remember correctly.

 

[ColinTaylor]

The power consumption at the mains plug is going to be less than 10W. I don't know what's available in Australia but I'd imagine that any mains UPS would easily be able to supply that amount of power for four hours. My question would be, without internet or power to other devices what use is the router?

 

[plato2322]

If there is a local power blackout it doesn't mean the internet is down so using a laptop and a router with a ups attached a power outage won't stop operations. Ideally what I'd like would be a Gen3 Smart Modem with ups and 4G backup but a bit too expensive as ongoing cost.

 

[Tech9]

What I did with mine, is removed the small battery and ran external leads to a much larger battery (20Ah)

This may damage the UPS and/or the battery. The charge and trickle charge currents are different for larger capacity batteries. The UPS charging circuits are usually protected and with max charging current value so more likely the battery will have shorter life.

 

[Tech9]

Does anyone use or know which UPS

Check the specs for which model can hold ~10W for the needed backup time, but preferably choose at least stepped sine wave model. Common switching power supplies used for household electronics heat up more with square wave and may generate more RF noise.