I bought one of these units, and was so impressed, a week later I bought another one.
Highly recommended! These are awesome for running your Fridge during a power outage.
They are tough, surge wattage is a problem, I ran my vacuum cleaner with this, my microwave, just as a test to see what it would do, flawless.
When using devices, like a microwave or a vacuum, the power will come down, kind of quickly as expected, but will run your Fridge for almost 12 hours.
If you have a fridge with lots of options, like Wi-Fi and it is a large fridge it may not last 12 hours, but definitely will last 8 hours!
I have two units, for two reasons, I can run multiple devices in multiple rooms, or I can charge one with my gas inverter, while the other one is still taking care of everything I need in the house! Especially my fridge.