SunFounder PiPower Raspberry Pi UPS Power Supply, Protect The Raspberry Pi and SD, 5V/3A, Expansion Board, Compatible with Raspberry Pi 4B/3B+/3B/Zero 2 W/Zero W (Battery Included)

All I can say is that this just works.I plugged it into my Raspberry Pi and have had several short power outages and the Pi has stayed up without issue.Obviously, I tested it a few times - but only for a minute or two. The real outages were for 10+ minutes with no issue.I had one 2+ hour power outage while I was sleeping and it did run out of power before power was restored, but I wasn't even aware and all of my other UPS's also ran out of power... I haven't been able to figure out the duration.So, unfortunately I cannot say how long it lasts - somewhere between 10 minutes and 2+ hours.Would I recommend it? Yes. Simple to use and will definitely provide backup power for a decent amount of time (I would guess 30 minutes at a minimum).I'd also like to mention that I am using this with the PoE HAT. My PoE+ switch has no issues powering this + the Raspberry Pi during charging or regular use.

This has helped solve and reduce outages on my Raspberry Pi aquaponics project. Helps to stabilize power if the voltage dips and adds runtime when the big battery bank hits disconnect allowing me to continue to monitor parameters for a several more hours. With sleep states you could probably get days out of it. The battery is somewhat common but not as common as a couple 18650 would have been. Not docking the rating for that though.

I have three RPi's running specific tasks that would cause some concern if the power failed. If nothing else, power failure often trashes the SDC chip, the Pi is running on. While , I constantly update/clone the SDC chips, I've lost data because of power blinks. That's when, somewhere down the line, a switch was thrown, a generator cut over, or whatever causes the power to cut off, and immediately comes back on and your SDC is trashed. One of my Pi's is plugged into an APC UPS, but two of them sit where putting even a small UPS would be a hassle.I got one of these SunFounder UPS's and put it on a test RPi. It's a good little kit, but could be a great kit. They give you extra parts and, even, a screw driver to put it together. So it goes together very easily. On the downside, this configuration makes it hard to put the Pi in a case, without some jury rigging. But, whenever you add hats to a Pi, you lose a lot of case capabilities.When you download the software SunFounder provides, you can check the status of the UPS. If you make the connections to the GPIO bus, Then you can load a script that shuts the Pi down when the battery gets to low. The downside is that you have to solder the wires to the UPS hat and then have connections for the GPIO header. Luckily I did, but everyone might not. It would be better if SunFounder put a connection header on the IO ports for the UPS.I've tested everything but the graceful shutdown, if the battery gets too low. I've been to busy with the Pi to get to that. Everything else works as it's supposed to. I have run the Pi for over two hours on battery alone, and that was while the Pi was actively performing functions.I'll be ordering a couple more of these to put on my dedicated Pi's. I just need to figure a case for them. Two of the Pi's sit where they are exposed to dust.UPDATE:I just got my first RPi 5. Naturally, I hooked it to power through the UPS. Unfortunately, within about 10 minutes, I got the low power popup. A few seconds later, the RPi shut itself down. I had heard that the powerbank UPS's didn't have the current required to run an RPi 5, but I had to try.That's OK for me, I'll probably go with an AC UPS to power the RPi 5's. I still have two RPi 4's sitting up in corners, where the Sunfounder works great.Pros --It worksEasy to put togetherKit has spare partsCons --Not powerful enough for RPi 5.No available cases for this configuration.Important feature requires soldering on the UPS IO ports. Needs a header to make it a great kit. For this I dropped a star.

Added one of these to a Pi 4 that is running a packet station at a remote amateur radio site. Been plugging along and no down time for almost a year. The optional Python monitoring program is useful and pretty easy to use but you do have to have a little experience with Linux.

This is a great (and necessary), addition to my project, a small, portable, retro gaming device. The instructions were clear and simple, and there were no issues installing the power supply to the bottom of my Raspberry Pi. The battery pack is a little chunky relative to the RPi, but it does have feet on the bottom which is a nice feature. If you plan to make your Raspberry Pi independent like I did, make sure your screen goes on the top, or else it will be incompatible with this power supply.I hope SunFounder releases more of these power supplies, maybe some a little smaller or lighter. I'm not complaining though. This was a great purchase!

This add on for UPS of a Pi is awful. The support from SunFounder it nonexistent.The PI cycles between low volt CPU warning and normal. I assume the circuit of the board low volts while cycle charging the battery. You can see the cycling in the screenshot. If I plug power directly into the PI, no power issues. I will never buy anything from SunFounder again.

One of the cables was missing, I contacted the company and I received a superb customer service. Susan answered right away and shipped me the missing cable for free immediately.The product looks very well made. I still have to use it some more, but so far so good.