One load.
3 capacity classes.
Every cell uses capacity × 80% ÷ average load. It is a consistent planning calculation, not a measured or guaranteed runtime.
The capacity classes are calculation examples only, not a particular model or UK product. Runtime is a calculation and does not prove a plug configuration, cable, conformity, availability, delivery, warranty or suitability for a specific load. Only where an AC path is actually used, check 230 V, 50 Hz, the Type G plug and socket, protective earth, the correct fuse rating, cable and RCD where applicable. DC and USB-C are separate connection paths.
Calculate your exact load →Estimated hours by average load
80% is a visible, simplified usable-energy assumption. Check losses, reserve, continuous output and starting surge separately for the actual setup.
| Average load | Compact class500Wh | Medium class1,000Wh | Large class2,000Wh |
|---|---|---|---|
| 10Wsmall electronics | 40hours | 80hours | 160hours |
| 25Wsmall electronics | 16hours | 32hours | 64hours |
| 50Wconnection and work | 8hours | 16hours | 32hours |
| 100Wconnection and work | 4hours | 8hours | 16hours |
| 200Wmedium load | 2hours | 4hours | 8hours |
| 500Wmedium load | 0.8hours | 1.6hours | 3.2hours |
| 1000Whigh load | 0.4hours | 0.8hours | 1.6hours |
Values are rounded to one decimal place. At low draw, inverter or station overhead can shorten runtime noticeably. Battery condition, temperature, power-saving behaviour and varying load also change the result. Enter losses, reserve, load and planned hours separately in Runtime Lab.
Set a realistic load range first.
50W with 1,000Wh
1,000Wh × 80% ÷ 50W = about 16 hours. Add measured overhead and a separate reserve for a stronger plan.
500W with 1,000Wh
The same capacity class calculates to about 1.6 hours. High-load conversion behaviour and battery temperature can change that value.
An appliance rated at 1,000W
The capacity class shows energy only. Continuous output and starting surge remain separate checks.