May’s Solar Generation and Export Numbers
Here is the overview for May 2023. May was again another improvement. No surprise, of course. The last two days of May were quite poor. We are really beginning to see what this system can do.
I added a three Home Assistant sensors to record the maximum watts the panels were producing. I was really interested to see the maximum of both roofs as the sun reach its highest point.
8 x 400 front, should produce 3,200 watts. I got 3773 watts
6 x 400 back, should produce 2,400 watts. I got 2505 watts
Both roofs could produce a theoretical 5,600 watts. That is never going to happen, but I got 4445 watts. I don’t think that is too bad.
The worst generation day was the 13th with only 7.1 kWh and the best was the 26th when 32.9 kWh was generated.
The best export day was the 26th with 15.9 kWh
The graph below is the total generation for May. Some of the battery came from the Octopus Agile overnight charging. More on that at the bottom of this post.
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
Octopus Agile
The costs shown here do include the standing charge. Any comparisons are compared to the until cost if we were not on Octopus Agile, which is 35.06p per kWh
For the month of May the average unit cost Octopus Agile Import was 17.31p. The average unit cost Octopus Agile Export was 9.26p
Our best export day by cost was the 24th with £1.36. The average Agile export rate for that day was 8.96p kWh
Our electricity cost from the grid for May was £21.67 compared to £32.50 on the standard tariff, this is a saving of £31.03 comparing Agile to the standard tariff once the export is also added
The solar generated £229.22 using the standard until rate of 35.060p per kWh
In total we exported 219.6 kWh and made £20.44
We have been charging the battery each night much less than other months. This month we used 6 half hour slots. In May we used 16. The average cost of the overnight slots used was 16p per kWh. This was higher than May. The cheapest slot was 15.51p per kWh the most expensive slot was 17.26p per kWh. These are the price slots were used, not the best slots. There were cheaper slots, but we didn’t need them on those days
The percentage of our electricity generated by the solar panels for May was 145%. We generated 653.8 kWh compared to the house consumption of 450.8 kWh. Some of that house consumption includes the Solar iBoost. That used 14.46 kWh of the solar we produced.
The best profit day was 24th. We made 90p. Import cost was 46p, the export was £1.36
Here is the Octopus Watch report summary
Octopus Watch summary
Featured posts
The best and worst solar power generation days