| One unit of mains electricity |
| One fully charged 100 Amp-hour accumulator |
| 10 hours of high power battery charger |
| 8 hours running the engine |
| 5 bright days of summer sunshine |
| 20 bright days of winter sunshine |
| 20 hours of TV or computer |
| 8 hours of full electric lighting |
| Pump a year's supply of drinking water |