The following table shows the generation of electricity by the solar panels for each month in 2011 in units (kW.hours). It also gives the units exported. As we do not have an export meter these are defined to be half the units generated. The last column gives an estimate of the units saved (i.e, used by us and not actually exported). The numbers do not add up! This is because in the winter virtually all the units generated are used by us - very little is exported as the heating is running 24 hours a day and that consumes electricity at a faster rate than we can generate in winter. In the summer it is extemely difficult to use more than half the electricity generated. We maximised our use by only running the heat pump for about an hour around midday, and also only using the washing machine and dish washer when we were exporting electricity. Overall we used just over half the electricity we generated.The total saving was £1743 for the year although £166 of this was assigned to the heat pump.
| Month | Units generated | Units exported | Units Saved |
| January | 53.3 | 26.7 | 50 |
| February | 75.1 | 37.6 | 70 |
| March | 296.2 | 148.1 | 250 |
| April | 494.7 | 247.2 | 200 |
| May | 509.0 | 254.5 | 215 |
| June | 435.3 | 217.7 | 175 |
| July | 446.7 | 223.4 | 231 |
| August | 338.1 | 194.1 | 186 |
| September | 305.3 | 152.7 | 171 |
| October | 217.6 | 108.8 | 200 |
| November | 84.1 | 42.1 | 75 |
| December | 69.1 | 34.6 | 65 |
| Totals | 3374 | 1687 | 1888 |
| Value | £1453 | £52 | £238 |
| Month | Units generated | Units exported | Units Saved |
| January | 95.8 | 47.9 | 90 |
| February | 149.1 | 74.6 | 140 |
| March | 333.4 | 166.7 | 300 |
| April | 348.3 | 174.2 | 300 |
| May | 509.0 | 254.5 | 215 |
| June | 435.3 | 217.7 | 175 |
| July | 446.7 | 223.4 | 231 |
| August | 338.1 | 194.1 | 186 |
| September | 305.3 | 152.7 | 171 |
| October | 217.6 | 108.8 | 200 |
| November | 84.1 | 42.1 | 75 |
| December | 69.1 | 34.6 | 65 |
| Totals | 3374 | 1687 | 1888 |
| Value | £1453 | £52 | £238 |