This unit runs for 2.5 hours with a 77 watt load. That's 192.5 watt hours which is quite a bit short of the claimed 293Wh. That result is from running it down to shut off (0%). The manual suggests only running the battery down to 15% which happened at less than 2 hours. That would put this unit's expected capacity at about half of the manufacturer's claim.I dismissed other competitive power stations because I had the mistaken impression that Jackery were made in US. That's my mistake but it seems that the company proliferates a US image with the big "US" on the side of the box (refers to AC current spec) but this item is as "Made in China" as it gets. The manual contains poor English to the point that some parts are unclear. The website is tough to navigate and the policies of the supposed extended warranty seem very limited and unclear. They do send you spam after you register for the warranty.In hindsight I wish I'd more carefully shopped competitors units. It's OK but not the home run you might think.

I tested the AC outlets with some fans. Measured 45w for this fan on mains thru a killawatt. Plug into the Jackery and the killawatt and Jackery wattage is 38 on their screens. The fan doesn’t run full speed you can hear the difference. Plug back into mains get full speed and 45w. CPAP on DC (cig lighter outlet) reads 9-10w on the Jackery. Seems to put out less air than normal. Resmed site says it should be about 12w on DC. Ran the fan on AC thru killawatt on a Bluetti. Runs full speed and reads 45w. Why doesn’t Jackery put out the right wattage?

Did the research, lots of it. Selected the Jackery 300 from among many competitors due to reputation for reliability and availability of a pure sine wave. If you are plugging complex electronics into this, such as computers, a CPAP, etc., as opposed to simpler/mechanical items like lights or a cooler, you need a pure sine wave to avoid damage to your equipment - clean power, vs dirty, in simple terms. This was purchased to provide emergency power for a CPAP.Form factor is excellent. Feels good in the hand and is highly maneuverable and very well balanced. Lots of thought went into the design. Make sure you read the instructions to avoid draining the battery: you need to turn the specific outlets you want to use ON when you need them, and OFF when you are done. Each group of outlets has an independent button to power them up/down.I had hoped to get one full night of CPAP use out of a single charge. Sadly, this is not the case. I got about 6.5 hours from a full charge the night before to 1% in the morning (see photo). For reference, the machine I was powering is the most common CPAP available: ResMed AirSense 10 with the water chamber. Pressure at 10.2, chamber and tube heat off. The unit charges quite quickly at 79W draw, plugged into a surge protector via 110V outlet at home (see photo).I had hoped for a bit more use time, but 6.5h will do. When we lose power it most often happens during the night, so it is unlikely I would need to use it for a full 8 hours anyway. Still though, if you want a guarantee of more than 6.5 hours uptime for your CPAP, maybe get the next model up. It turns out the Jackery 500 is currently really expensive, so you are better off getting two of these, provided you don't mind switching from one to the other when the first one runs out of juice.One more thing which bugs me: the unit comes with two power cords for charging it (AC110V and DC12V with a 12V/lighter adapter). These fit nicely into a zipper pouch. Unfortunately, the unit does NOT come with a storage bag for the unit itself. I will be needing to purchase a separate storage bag/box to hold both the unit and the cable pouch. To not provide one at this price point feels like Jackery cheaped out here. Also, the Jackery-branded 100W solar charger is ABSURDLY overpriced. Literally $100 more than it should be. I will be waiting for that to go on sale, if I get it at all.I do recommended this unit. I am giving it only 3 stars because: A) 8 hours would be much more useful - this is a VERY common application for this unit (read the comments) and the fact this does not provide 8 hrs of power for the most common CPAP at this price point kind of sucks. B) The lack of a storage bag/box (aside from the cardboard packaging) also sucks. C) The ridiculously overpriced recommended 100W solar charger is a joke at that price. 3 stars MAX.