Time is a factor. You have to charge for 1.5 hours to be able to pull in 1 hour (minus system losses)

A Watt is an SI unit defined as 1 joule/second, and is used for measure rate of energy usage/generation. So this system generates up to 100 joules/second, and can output up to 150 joules/second (until the stored energy is consumed).

That's the max charge and discharge rates. The battery capacity is a separate number. You can only discharge what you have in the battery.