Start with the equipment and the hours, then choose the battery. Multiplying an average load by its running time gives the energy delivered to that load. It does not tell you the nominal battery capacity you need until you account for losses and reserve.
Build a simple energy budget
As an illustration, a 40 W average load for five hours requires 200 Wh delivered. Add the other devices you intend to use over the same session. These are planning assumptions to replace with your own equipment figures, not measured consumption for a particular appliance.
Keep the highest simultaneous load separate
A short high-power task can be a small part of your energy budget and still exceed a station’s output limit. Add the loads that run together. Check startup requirements separately where relevant. A device charger’s maximum rating may differ from its average draw.
Use a range rather than a promise
The energy planner lets you set the share of nominal capacity that reaches the load and the reserve you wish to keep. These are your scenario assumptions. Changing them shows why one headline runtime cannot represent every setup.
The planner displays catalogue candidates for further checking. It does not infer compatible sockets, startup performance, usable AC energy or support in your country from a model name. Missing output evidence remains a reason to verify the exact regional unit.
Count the next recharge opportunity
For a day at an event with overnight charging, budget the session and a late finish. For a weekend away without a dependable recharge route, budget the whole interval. Solar can change the plan, but only if you allow for conditions and have a compatible panel.
Our buying position: a documented load plan is more useful than buying an arbitrary 1,000 Wh or 2,000 Wh class. Use camping or mobile work to turn the calculation into a practical shortlist.