May Solar Generation and Export Numbers
Here is the overview for May 2024. Octopus Agile was very stable in May and not in a good way. Not that we should complain, it is still way cheaper than the price cap. It hovered around 15p kWh overnight for most of May. No plunge or really low prices this month.
My new strategy of topping up overnight and exporting earlier is paying off. This was the first month ever we have covered not only our electricity import, but the standing charge as well, with just solar. At one point it looked like we might cover the gas.
The worst generation day was the 31st with only 4.10 kWh. The best was the 9th when 28.40 kWh was generated.
The best export day was the 12th with 19.40 kWh. This was all solar, not forced export.
Rather than show an export profit, I thought it would be easier to show the cheapest day.
As solar panels output declines over the years I have added the 2023 May 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 41 days where we generated more solar than we consumed, and 70 days more solar was generated than we imported from the grid.
June is going to be interesting. On the 5th June we are having 3x 3.2 kWh batteries added to the system. This will give a total for 19.2 kWh of battery storage. We have added these in preparation for the heat pump install in July.
May 2024 Octopus Energy bill
This is the Octopus Watch report comparing other Octopus tariffs. We don’t have an EV, but thought it would be an interesting data point
Octopus Watch Tariff Comparison Report
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 May 2024
| Date | kWh | |
|---|---|---|
| Best generation | 9th | 28.40 |
| Best front generation | 9th | 17.30 |
| Best back generation | 19th | 12.80 |
| Worst generation | 31st | 4.10 |
| Worst front generation | 31st | 2.30 |
| Worst back generation | 3rd | 1.80 |
Best Solar Export and Profit
| Date | kWh | Profit | |
|---|---|---|---|
| Exported kWh | 12th May 2024 | 19.40 | |
| Exported profit | 12th May 2024 | 19.40 | £2.91 (15p kWh) |
| Profit day | 14th April 2024 | 18.20 | £2.67 |
Solar/Battery Export and Profit May 2024
| Date | kWh | Income/Cost | |
|---|---|---|---|
| Best kWh export | 12th | 19.40 | |
| Best export profit | 12th | 19.40 | £2.91 (15p kWh) |
| Cheapest Day | 12th | -£2.17 |
The graphs below is the total generation for May compared to the rest of the year.
2024 generation graph. January to May
Generation
Overview for May
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 May 2024
Back panel generation for January to May 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 25.255p 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.
May Grid Information
| Standard Tariff | 25.255p | ||
| Standing Charge | 42.11p | ||
| Cost from the grid | £27.98 (Agile) | £55.43 (Standard) | |
| Savings including export | £73.49 | ||
| Exported | 304.30 kWh | £45.65 @ 15p kWh | |
| Agile slots used | 77 | ||
| Agile plunge slots used | 0 | ||
| Average Agile slot price | 12.74p | ||
| Cheapest slot | 0.378p | ||
| Most expensive slot | 17.262p | ||
| House consumed | 495.80 kWh | ||
| Solar generated 2024/2023 | 581.20 kWh | 653.80 kWh | |
| Percentage generated by solar | 117% | ||
| Solar iBoost used | 11.61 kWh | ||
| Self Sustained Days 2024 (More solar than consumed) | 41 | ||
| Self Sustained Days 2024 (More solar than we imported) | 70 | ||
Here is the Octopus Watch report summary
Octopus Watch summary
Featured posts
The best and worst solar power generation days