I believe it will run your pump for a long time if it's only 6 watts, I use it for my gaming set up and after a power outage it will run my 27" LED gaming monitor, my Xbox one S and my modem and router for over one and a half hour and I'm sure that's more than 6 watts. Also on the back of the unit it tells you how many plug in outlets are designated to the power back up and how many are just for surge protection.