Following up on my previous analysis it is finally time to close the books on 2025. The last two months are in and we can now see the complete picture of how my balcony setup performed over the full year. Solar power is a long term game and seeing the seasonal shift in data is always the most interesting part for me.
Complete 2025 Generation Overview
Here is the finalized table for the entire year including the low yield winter months at the end.
| Month | Total Energy (kWh) | Avg. per Day (kWh) |
|---|---|---|
| January | 7.93 | 0.26 |
| February | 18.97 | 0.68 |
| March | 50.52 | 1.63 |
| April | 74.88 | 2.50 |
| May | 93.46 | 3.01 |
| June | 93.84 | 3.13 |
| July | 63.42 | 2.44 |
| August | 75.47 | 2.70 |
| September | 43.42 | 1.45 |
| October | 7.55 | 0.69 |
| November | 6.91 | 0.28 |
| December | 7.26 | 0.23 |
Year End Analysis
As expected the performance dropped significantly during the last two months of the year. November was actually the weakest month of the whole year with only 6.91 kWh total energy. December performed slightly better in total with 7.26 kWh but had a lower daily average of just 0.23 kWh because of the longer month. These values are typical for the German winter where gray skies and very short daylight hours are the norm. Additionally i turned off the Balcony Solar Power during my vacation in Asia.
The 2025 Totals
Adding everything up the system generated roughly 541 kWh over the course of the year. For a balcony setup this is a very solid result. Looking back at the peak months in May and June where I generated nearly 94 kWh each month it is clear where the real value of the system lies. This yearly yield represents a significant saving on my electricity bill especially with current energy prices. Every kWh produced on the balcony is one I do not have to buy from the grid. This brings me much closer to the final break even point of the entire hardware investment.
The year 2025 showed exactly what to expect from a balcony solar system. You get huge wins during the spring and summer while the winter months mostly serve to keep the statistics running. I am very satisfied with the 541 kWh total as it proves that even small urban setups can make a real difference in personal energy consumption.
Now I am looking forward to 2026 and hoping for a few more sunny days in the early spring.