Eaton Serie 3S Mini DC UPS 3SM36B – 36W Backup Power for Routers, IP Cameras & Smart‑Home Devices, 9/12/15/19V Output Options, 4‑Connector Adapter Set, Black/White (B092TG9M7C) – United Kingdom, G...

I bought one to keep my Synology NAS running in the event of a power outage. Because it connects via USB, the NAS is notified of a power outage and shuts down gracefully after a pre-determined time. I've also connected a Virgin Media modem, a router and a USB hub and, based on my trials, they'd all run (including the NAS) for about 40 minutes, which is more than I'd expected. That said, I've got my NAS set-up to power down gracefully after 15 minutes - which should see me through any quick drops in power or outages. I figured if the power's still out after 15 minutes then it's probably going to be a long outage which would exceed the UPS's battery capacity anyway. Nice to see the UPS also has battery drain protection built-in, meaning it would power off before fully draining (which would damage the battery). So yeah, I highly recommend this UPS. It does exactly what it's supposed to do and does it very well.

I live in an area subject to irregular, but relatively frequent, power cuts. Four in the last month, each for a variety of reasons, and each lasting a couple of hours or so. The usual apologies from the supplier (Northern Powergrid) but no confidence matters will improve anytime soon. When they're blaming squirrels you know you're in trouble... Unfortunately, the mobile networks go down too, so our entire village goes off the comms grid. With BT digital voice allegedly coming next year we will be deprived even the trusty landline. So some kind of contingency makes sense, if only for emergencies. There are any number of these units on Amazon, and you have to pick one, so the Eaton 3S mini was it. Arrived in a couple of days. Easy to set up. Although it has 4 dc power outputs the default setting is 12V, fine for the BT hub we have. There are 4 barrel connectors included, one being 3.00mm which is compatible with the modem. It fits, and that's good enough for me. Took about 10 mins max to install, let it charge overnight, then switched off the mains power to the hub this morning. The latter continued to function. So far so good. We'll have to wait for another power cut to test in in real world conditions, but assuming the back up batteries in the BT street boxes are good for a couple of hours then we should be ok. We'll see. Update 4 July 2024 Another power cut this afternoon. 6 now in 7 weeks. Step forward Northern Powergrid... We were reconnected to the mains supply after 1 hour 45 mins or so. The backup battery kept us connected but judging by the status lights on the front I guess we had another 15 mins tops. So 2 hours powering a standard BT modem

I own three of these units. Two worked great during a power cut yesterday, but one of them instantly dropped the output power. They are all around 12 months old. The one unit which failed had actually been fully discharged once, several months ago during a previous power cut. The other two units did not fully discharge, because they have very light loads (~3 watts vs the ~9 watts attached to the failed unit). Both of the lipo cells inside (TP LI-ION 3.7V ICR18650 2200mAh MH46259 UD020) now read at roughly 0.125 volts, so my /assumption/ is that these are unprotected cells and the unit itself does not have a low-voltage automatic cutoff. This is extremely problematic, because whenever there's a lengthy power cut, there is a solid risk that the unit itself will then be bricked unless you want to manually replace the lipo cells inside. So I'm afraid I need to give the "overall rating" as just one star because of this. Sorry, Eaton. Unless I'm mistaken and the one unit is faulty, then you will need to release a revision 2.0 which includes proper cell protection. Ideally they would auto power-off at, say, 20% power remaining. Perhaps even make the percentage/voltage configurable with a DIP switch somewhere, but obviously a DIP switch would add slightly to the materials cost & the plastics would need redesigning, so a straightforward X% cut-off would be the most reasonable thing to implement.

Edit. 2 years later I’ve repeated some full discharge and recharge tests, including discharging it at the max rated 36Watts and unlike others still have has no problems with the recharge sequence. The failure of the low cell voltage protection reported by some hasn’t occurred on my unit. This Eaton3S and the APC CP12036Li remain the best options available for anyone looking for a small DC UPS with a recognised name. Nicely made mini UPS from a recognisable name, with a 2 year warranty its got the feel of a quality product. Well documented. It has some nice features, like switchable output voltage level and a relatively high supply rating of 36Watts. I've run some12V load tests when on battery and the output voltage only dropped from [email protected] to 11.3V@3A. The DC output level was also maintained well as the battery ran low . By including the AC/DC conversion inside the unit there is only space to include 2 off 2200mAH lion cells, so overall capacity is a fairly small but usable 11.9Wh (measured). So it should be able to run a typical small router (5-6Watts) for around 2hours, that's probably long enough for most typical mains power interruptions. The battery recharge rate is a relatively low 4Watts so once mains power is restored it does take around 5Hours to fully recharge . Once fully charged the UPS appears to use <1W to manage its own functions To make it a better prospect than its competitor MiniDC UPS What it ideally needs is either larger internal batteries or perhaps the ability to recharge from an external powerbank. The case would benefit from some mounting holes and there's also no audio warning to indicate 240V power failure. It is however one of the few MiniDC UPS that I'd be content to leave running unattended in my house 24/7/365.

I bought this UPS a couple of months ago because the mains was becoming unstable with the lights flickering badly etc. (later traced by the utility company to a poor connection out in the street). Two days after I installed it and connected my PC, Router and Smart TV, the mains went unreliable with more flickering lights and clocks resetting etc., but the connected router and PC just continued working as normal. There have been a couple of momentary mains outages of a few seconds since and again the PC etc. had no problems. I also discovered on the Eaton website there's a form to fill in for the monitor software, I put something like private domestic user and was sent a link to a slightly older but perfectly functional and useful piece of software to monitor the current status and alarms. The distance between the two rows of sockets for filtered and filtered+UPS is larger than on some other UPS units which means some bulkier adaptor type plugs rather than the normal plug size can be accommodated. It also has a slide out panel on the base giving access to the battery which means it can easily be swapped out when at the end of its serviceable life. This makes me think this is a unit built to last. I am very pleased with my purchase which is performing flawlessly and wouldn't want to be without it.

Out 850 has only dealt with small outages BUT has critically kept our Broadband router and (recent introduced) IP phone online, preventing the need for a 5 minute reboot, disconnected meetings and WiFi drop outs. On that basis I'm really pleased. I estimate perhaps up to an hour or 2 as it only runs the Broadband Hub and the house phone base unit. What hasn't worked is the Eaton online access - the simple instructions of 'connect cable and access whatever' are deficient. Quite what I am able to access I don't know. Perhaps battery status and health.

Having been provided with a new router by our internet provider, and also being migrated onto a voice over internet phone service, we decided that we needed a small UPS for the router in order to maintain phone and internet connectivity in the event of power cuts - we live in arural area and power cuts are a fact of life, even if they're not common. I did a fair bit of looking around to see what was available for what prices. I didn't want a cheap, no-name product, but I didn't want to spend the earth either. APC and Eaton seemed to be the best brands out there, and I'm familiar with the products of both companies. They are both "real" companies and supply products backed by proper warranties. In the end, the Eaton won out - largely because the connectors suited our router better (and it was also a bit cheaper). As it was, the 3.5mm barrel connector was still a little bit short and I had to machine away a small amount of the plastic surround to get a more secure connection - that's as much to do with the particular construction of our router, rather than being a fault of the UPS. That aside, it's a very neatly made package and is easy to set up and get running. I haven't yet tested the endurance of it to see how long it will keep the router running, but it does continue to run the router without any glitch or hesitation when I turn of the mains for a few minutes.

We regularly suffer from short power cuts and brown outs in this area which can corrupt modems and lock out connected devices. This UPS removes any glitches from the mains and provides continuous power to small devices like modems, routers, cameras etc. Up to now, I have installed two of these UPS to power modems and have achieved 24/7 operation with no connection problems for several months now. Even during power cuts, portable devices like laptops and iPads stay connected to the internet and continue to work. As mentioned by others, the option to wall mount would be helpful but it is easy to improvise an alternative way to fix on a wall. After using this UPS 24/7 for two years I happened to switch off the mains supply and discovered the unit was not acting as a UPS but as a simple power supply. I opened the unit up and replaced the two batteries with a new pair of flat top Samsung 25R 18650 batteries and the UPS worked fine. Changing the batteries is quite simple but comes with the usual warnings about voiding any warranty and the fire risk from not using suitable Li ion batteries. The procedure is as follows: Disconnect unit from mains and devices. Prise off the four rubber feet. Use torx screwdriver to remove screws, there is a yellow tamper indicator over one screw. Pull PSU apart to reveal batteries. Swap batteries noting polarity. The photo shows new batteries. Put PSU back together. Plug in mains and recharge batteries to give a repaired PSU at the fraction of the cost of a new unit. As mentioned earlier, I bought two of these PSU and both failed because of faulty batteries. I'm hoping that a good brand like Samsung will give a longer battery life compared to the original TenPower batteries. Knocked 2 stars off for poor battery life.