Price Per Watt-Hour vs. Price Per Continuous Watt: Two Different Ways to Compare
Price per watt-hour ($/Wh) measures value for how much energy you can store — relevant to how long the unit runs a given load; price per continuous watt ($/W) measures value for how much power you can draw at once — relevant to what appliances the unit can run simultaneously and whether it can handle a higher-wattage device at all; two power stations can be excellent value on one measure and mediocre on the other, since storage capacity and output power are genuinely separate specifications, not two sides of the same number.
Conflating these two measures is a common shopping mistake, since a unit optimized for one doesn't automatically excel at the other.
When storage value ($/Wh) matters more
If your priority is running modest loads (electronics, lighting, a small fridge) for as long as possible between recharges, $/Wh — covered in the price-comparison guide — is the more relevant measure, since it's total available energy that determines how long you can keep going.
When output value ($/W) matters more
If your priority is running a specific high-wattage appliance at all — a power tool, a larger air conditioner, anything with meaningful surge watts as covered in the Surge Watts Calculator — the unit's continuous and surge output rating matters more than its total watt-hour capacity, since an underpowered inverter simply won't run that appliance regardless of how much energy is stored behind it.