AC Output indicates the maximum wattage (electricity) that the portable power station can deliver continuously on demand. If any appliance you want to operate exceeds the AC output, the PPS can't run it. Similarly, the total wattage of all the appliances you want to operate at the same time can't exceed the maximum AC output — in this case, 4000W.
A portable power station's capacity, which is measured in watt hours (Wh), determines how long a portable power station can provide power for a given total wattage of electronics or appliances before its batteries are depleted.
Voltage is like the pressure that pushes electrical current through your device. Most modern power banks are built to output either 5V, 9V, or even 12V depending on the type of charging they support (like standard charging or fast charging). A regular USB-A port usually outputs 5V.
Let's start at the top. Rated capacity indicates the maximum amount of electricity a portable power station can store in its battery when fully charged. If you allow your portable power station (PPS) to discharge completely before recharging, the capacity is the maximum amount of electricity you can consume.
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