Greetings, everyone!
November brought rather unfavorable weather to Bucharest, with frequent fog and persistent cloud cover, conditions that significantly reduce the effectiveness of solar installations.
One of the key advantages of micro solar systems is that each panel is connected to its own MPPT channel. MPPT stands for Maximum Power Point Tracking, meaning the controller dynamically adjusts the electrical load so the panel operates at the point where it can deliver maximum power. In practice, this is done by continuously changing the equivalent resistance seen by the photovoltaic panel.
Photovoltaic cells have complex current–voltage characteristics that depend heavily on temperature and solar irradiance. Because these conditions change constantly, the controller must continuously search for and maintain the operating point that delivers the highest possible output.
In higher-voltage systems, multiple panels are typically connected in series to improve inverter efficiency, since the inverter converts DC voltage into 110V/220V AC. The downside of this approach is reduced flexibility for MPPT control: panels connected in series must all operate at the same current, even if their temperature or illumination differs. This makes it harder to keep each panel at its individual optimum.
The result is that under non-ideal weather conditions, micro systems generally perform better overall.
As shown in the graph below, November offered only three to five days of good solar conditions. Despite this, a total of 15.92 kWh was generated, an impressive result for a single panel.
Solar Panel Generation Graph for November 2025:
During November, I also picked up a small optical tool that turned out to be extremely helpful for finding the optimal orientation of the solar panel. It’s a simple yet effective device, especially if you can adjust both tilt and direction. A small dot in the center casts a shadow, and the position of that shadow shows exactly how many degrees need to be added or subtracted to achieve maximum solar illumination:
History of My Solar Reports:
| Month | Generated | Used | Exported | Imported | Installed Power |
|---|---|---|---|---|---|
| November 2025 | 15.92 kWh | - | - | - | 610W (1x610W panel) |
| October 2025 | 29.33 kWh | - | - | - | 610W (1x610W panel) |
History of My Investments:
| Month | Items | Amount |
|---|---|---|
| November 2025 | solar angle guide | €15 |
| October 2025 | 1x solar panel (Canadian Solar 610W N-type TOPCon Bifacial) | €99.20 |
| 1x microinverter (EcoFlow STREAM Microinverter) | €94.05 |
We don't have microinverters, but then all our panels should get much the same sun. I wasn't really aware of the technology until recently, but it could be good if you have panels at different angles to the sun or trees that cast shadows on them.
I hope you get some sunshine in January.
!BEER
Even when panels are located at the same angle and are not shadowed by trees, when the weather is cloudy, and when many panels are connected in series, some of them will get less light than others. Parts of the light are blocked by the moving clouds, for example, or the difference in translucidity of the clouds. Microinverters are solving this problem, and price-wise, they've become accessible.
Another way to solve the same problem is with optimizers (I've seen it widely used with Huawei inverters). These are local MPPTs that are doing the power optimisation per individual panel or formations of a few units, coupled with a DC-DC converter that brings the units to the same value of the current, so that they can be serialized at maximum individual performance. These optimisers also communicate in real time with the inverter, and often include safety mechanisms. From the technical point this is the best solution. Local optimum is achieved for each panel while maintaining a high voltage at the inverter, making it more efficient to convert from DC to 110/220V AC. The issue is that there's no standardisation for the communication between the inverter and optimisers, resulting in no compatibility between equipment from different providers.
Helping hand...
!ALIVE
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thanks, man!
!PIMP
It sounds like a bad month due to the weather, and I hope the weather improves soon.
It's normal for winter here. This kind of weather gives you time to relax and put a layer of fat on you :))
!PIMP
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