September Solar Generation and Export Numbers
Here is the overview for September 2024. Octopus Agile was not as good as August. August had an amazing 84 plunge pricing slots to September’s 15. September was a very wet month. We generated 81 kWh less than last September. We only had 10 days where we generated more solar than we imported from the grid.
The heat pump is now the single source of heating and hot water. We heat overnight from 2am to 4am. In reality it takes 15 minutes to heat the water from 45c to 48c. The heat pump is set to keep the hot water temperature at 45c if it falls below that. We also do a top up at 12pm.
The worst generation day was the 30th with only 2.10 kWh. The best was the 13th when 21.99 kWh was generated.
The best export day was the 10th with 18.60 kWh. This was mainly from the battery. The best solar day was the 17th with 7.10 kWh.
As solar panels output declines over the years I have added the 2023 generation to the table at the bottom. Of course weather comes into it as well, but I thought it would be interesting to track.
So far this year we have had 107 days where we generated more solar than we consumed, and 162 days more solar was generated than we imported from the grid.
September 2024 Octopus Energy bill
Octopus Energy bill for September 2024
Octopus Watch Tariff Comparison Report. This does not include exporting
Best Solar Generation
| Date | kWh | |
|---|---|---|
| Generation | 26th May 2023 | 32.90 |
| Front generation | 14th June 2023 | 19.80 |
| Back generation | 7th June 2023 | 14.70 |
| Worst generation | 12th December 2022 | 0.20 |
Solar Generation September 2024
| Date | kWh | |
|---|---|---|
| Best generation | 13th | 21.99 |
| Best front generation | 13th | 13.10 |
| Best back generation | 13th | 8.89 |
| Worst generation | 30th | 2.10 |
| Worst front generation | 30th | 1.01 |
| Worst back generation | 30th | 1.09 |
Best Solar Export and Profit
| Date | kWh | Profit | |
|---|---|---|---|
| Exported kWh | 15th June 2024 | 22.20 | |
| Exported profit | 15th June 2024 | 22.20 | £3.15 (15p kWh) |
| Profit day | 14th April 2024 | 18.20 | £2.67 |
Solar/Battery Export and Profit September 2024
| Date | kWh | Income/Cost | |
|---|---|---|---|
| Best kWh export - Battery & Solar | 10th | 18.60 | |
| Best kWh export - Solar Only | 17th | 7.10 | |
| Best export profit | 10th | 18.60 | £2.79 (15p kWh) |
| Cheapest Day | 10th | -£1.81 |
The graphs below is the total generation for September compared to the rest of the year.
2024 generation graph. January to September
Generation
Overview for September
The graph below shows the generation for each day
Graph showing production for the month
The graphs below show the generation split between the front and back panels
Graph showing production for the front facing panels
Graph showing production for the back facing panels
The graphs below show the yearly generation split across both the back and front panels
Front panel generation for January to September 2024
Back panel generation for January to September 2024
Octopus Agile
The costs shown here do include the standing charge. Any comparisons are compared to the unit cost if we were not on Octopus Agile, which is 0.23084p per kWh. This is the new unit cost after the price cap took affect. The standing charge was 0.4211p
As mentioned above we are still using overnight slots due to my new export strategy. The average slot price was quite high this month.
September Grid Information
| Standard Tariff | 23.084p | ||
| Standing Charge | 42.11p | ||
| Cost from the grid | £20.57 (Agile) | £88.55 (Standard) | |
| Savings including export | 87.87 | ||
| Exported | 132.60 kWh | £19.89 @ 15p kWh | |
| Agile slots used | 164 | ||
| Agile plunge slots used | 15 | ||
| Average Agile slot price | 11.22p | ||
| Cheapest slot | -1.743p | ||
| Most expensive slot | 19.85p | ||
| House consumed | 549.40 kWh | ||
| Solar generated 2024/2023 | 333.00 kWh | 411.30 kWh | |
| Percentage generated by solar | 61% | ||
| Self Sustained Days 2024 (More solar than consumed) | 107 | ||
| Self Sustained Days 2024 (More solar than we imported) | 162 | ||
Here is the Octopus Watch report summary
Octopus Watch summary
Featured posts
Solar panel performance declines over the years. I thought it might be interesting to see how mine compares. Of course weather comes into it, but hopefully this will be a useful guide.