List essential loads
Start with the refrigerator, lights, communications and other equipment you truly need. Add their expected simultaneous wattage rather than trying to power the entire house by default.
Separate power from energy
AC output determines what the station can run at once. Battery watt-hours determine roughly how long those loads can run. Both numbers matter.
Plan for recharging
Consider wall charging, vehicle charging and compatible solar input. Solar performance varies with weather and panel conditions, so it should not be treated as guaranteed daily energy.