Not all devices have to be on continuously (eg. Microwave or blender). Certain devices can be turned off to allow other devices to be used temporaily.
Xantrex inverters are designed to support 2-5 seconds of power surge buffer during device startup.
Disclaimer: Appliances vary in power settings based on model and make, each person's journey is unique and there's no one size fits all. The purpose of this tool is to give you a basic understanding of what appliances you can theoretically run simultaneously for different inverter models. Be sure to calculate your own appliance's power draw to know your setup's precise power needs. Consult with an installer or electrical expert for professional power advice for your power needs.