I got my Goal zero 500x last week and after charging i run test with my Engel MT35 fridge. I loaded 1 gallon water jug in the fridge, plugged it in 500x, set temperature to 30 degree and started timer. Water jug was about 50 degrees cold. Fridge was sitting in our kitchen in about 72 degree. It was drawing up to 60Wats up and down. After few minutes goal zero output faulted and fridge cut off. Not sure what happened but I reset the fault and let it run again. I was really pleasantly surprised with the result. Goal zero 500X run out of power after 61.5 hours. That was way more that I expected.