The short answer
Cost per kWh generally falls as batteries get larger, and cost per running watt falls as generators get larger — but price per unit ignores noise, chemistry, fuel flexibility, weight and warranty, so use it only to shortlist.
Listed price per unit, by size class
| Category | Products | Lowest | Median | Highest |
|---|---|---|---|---|
| Power stations, under 500 Wh | 20 | $521/kWh | $781/kWh | $1,662/kWh |
| Power stations, 500–1,500 Wh | 25 | $346/kWh | $488/kWh | $962/kWh |
| Power stations, 1,500–3,000 Wh | 17 | $317/kWh | $439/kWh | $772/kWh |
| Power stations, over 3,000 Wh | 20 | $312/kWh | $456/kWh | $683/kWh |
| Generators, under 3,000 W running | 21 | $0.19/W | $0.25/W | $0.46/W |
| Generators, 3,000–6,500 W running | 71 | $0.09/W | $0.21/W | $0.46/W |
| Generators, 6,500–10,000 W running | 28 | $0.11/W | $0.17/W | $0.32/W |
| Generators, over 10,000 W running | 37 | $0.09/W | $0.20/W | $0.41/W |
| Solar panels (all) | 76 | $0.50/W | $1.75/W | $5.56/W |
Wattstanding calculationPrice per kWh = listed price ÷ (watt-hours ÷ 1,000). Price per watt = listed price ÷ running (generator) or rated (panel) watts. Medians are across published products only; installer-quoted systems are not included.
Figures marked as Wattstanding calculations show their working; product figures come from the sources on each product page. How we work