One average load.
3 planning classes.
Every cell uses generic rated capacity × 80% ÷ average load. It is a consistent planning comparison, not a measured or guaranteed runtime.
These capacity classes are calculation examples, not Irish products. Runtime is a calculation; only where an AC path is actually used, check 230 V, 50 Hz, a correctly fused Type G mains lead, protective earth, cable rating and the exact manual. Those AC checks do not apply to a DC-only path.
Calculate your exact load →Estimated hours by average load
Starting power is a separate check. A runtime cell does not prove a motor, compressor or appliance can start.
| Average load | Compact planning class500Wh | Mid-size planning class1,000Wh | Large planning class2,000Wh |
|---|---|---|---|
| 10Wsmall electronics | 40hours | 80hours | 160hours |
| 25Wsmall electronics | 16hours | 32hours | 64hours |
| 50Wmobile and work | 8hours | 16hours | 32hours |
| 100Wmobile 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 round to one decimal place. At very low draw, inverter or station overhead can shorten runtime substantially. Battery condition, temperature, power-saving behaviour and changing loads also affect the real result.
Bracket the load before relying on one number.
50W load with 1,000Wh
1,000Wh × 80% ÷ 50W = about 16 hours. Add measured idle overhead to the load for a stronger estimate.
500W load with 1,000Wh
The same generic class calculates to about 1.6 hours. High-load conversion behaviour and battery temperature can change the result.
A 1,000W appliance
Runtime is below one hour for the two smaller classes. Continuous and starting output remain separate pass/fail checks.