Continuous output
Continuous output is the power an inverter can supply under specified conditions. Add the devices that may run simultaneously, then compare the total with the station’s overall and individual-port limits.
Ambient temperature, battery state and bypass mode may affect available output. Check the manual rather than assuming the maximum rating applies to every operating mode.
Startup demand
Compressors, pumps and some tools can require more power while starting than while running. The required peak and its duration vary by device; a generic “two times the watts” rule is not reliable for every motor.
Check manufacturer data or an appropriate measurement. A plug-in meter that reports average watts may miss the brief inrush current.
An illustrative load combination
Imagine a refrigerator needs 1,000W briefly to start, while other connected devices use 200W. The station must support the combined startup event, not just the refrigerator alone. Once running, energy use may be much lower.
These are sample numbers, not specifications for your refrigerator. Starting capability and runtime must both be checked.
Do not confuse surge with boost mode
Some products use a voltage-reducing boost mode for selected loads. That is not necessarily equivalent to delivering full rated voltage at the advertised boosted wattage, and it may be unsuitable for sensitive electronics.
Treat a compatibility list and the device manual as more useful than a headline boost figure. Do not use a temporary surge rating as a continuous operating target.