A few good questions.

Which Fossibot model should I buy?

The FOSSiBOT F1800 Portable Power Station, 1,800W / 1,024Wh suits campers and home-backup shoppers who want 1.8kW output in a quiet LiFePO4 station. The FOSSiBOT F3600 Pro Portable Power Station, 3,600W / 3,840Wh suits home-backup, RV and off-grid shoppers who want a large expandable LiFePO4 station.

Who should skip the FOSSiBOT F1800 Portable Power Station, 1,800W / 1,024Wh?

Look elsewhere if you need 3kW or more of output.

Who should skip the FOSSiBOT F3600 Pro Portable Power Station, 3,600W / 3,840Wh?

Look elsewhere if you want a light carry-anywhere station.