What can a 900 watt generator power?

with a 900 Watt generator, your actually running about 800 watts and it jumps to 900 when apliances kick in. You should be able to power your refrigerator and sump pump during an emergency, depending on the power consumption of your fridge.

As a rule of thumb look at both for wattage usage and add another 10% for when they kick on and that should give you what wattage you need.

For example Lets say your running the following

Standard energy saver 18 cu.ft Refrigerator - 300 watts. runs 30% of the time

Sump Pump - 500 watts. Stays on 100% of the time. Wattage low until pump kicks in.

The maximum wattage your using is 800 watts. However when one or both apliances kick on there is an extra energy draw.

BTW a 900 Watt generator would be perfect for camping to run a few lights and small appliances.