Energy and power are different
Wh measures stored energy; continuous output W determines what devices the station can run at once. A 1,000 Wh unit with insufficient output cannot run a demanding device just because its battery is larger. Check startup surges and output types as well.
A simple worked example
A 100 W average load used for four hours needs 400 Wh delivered. At an illustrative 0.85 conversion efficiency, the battery needs about 471 nominal Wh. A station advertised at 500 Wh is tight; 1,000 Wh offers buffer but may weigh and cost more. Actual results depend on the model.
Compare the whole trip
How many days will you be off-grid? What can you carry? How much can you recharge daily? Check solar input limits, recharge time, warranty and dimensions. For a fridge, measure its daily Wh first. Use the calculator to choose by demand.
Frequently asked questions
Will a 1,000 Wh station run twice as long as 500 Wh?
With the same load and comparable efficiency, it can approach twice the run time. Real losses and model limits alter the result.