How can I get to know the duration?

There are so many models of electronic products that we cannot clearly list them all， But you can tell how long can they be supported by the portable power station with some simple math calculate.

Let's say you have a 500Wh portable outdoor power station and a mini fridge rated at 48W to be charged, you can simply divide the two numbers to get a 10-hour battery life result.

However, due to heat loss during energy transfer, the actual result may be slightly less than the calculated figure by about 10%, which means your mini fridge will get a 9 hour run time.