Want to know how long an Eco Flow will power something? Take the watts. You can Google how many watts most items take. (portable AC, 450 to 750) Let’s assume it’s small and we’ll use 450. 450 x .8 (80%) divide by 1500 (watt hours of Eco Flow that you are buying)

450 x 80% = 360
1500/360
You can run that portable AC for about 4 hours before you drain that 1500 watt battery.

Hope this helps. I have 6 batteries from Eco Flow of all different sizes. Love them! Best customer service!