A case study by DAH Solar, based on an analysis of influencer Lucas Gil's solar power plant, showed that photovoltaic systems can maintain high performance even with lower solar incidence than predicted in market simulations. The installation was supported in partnership with the company Nature.
The evaluation aimed to compare the plant's actual generation with the estimates used at the time of sale, considering factors such as solar radiation, weather conditions, and electrical grid stability, in addition to a study to verify whether the analyzed plant delivered, in practice, the performance promised to the consumer.
According to the company, the results indicated consistent performance from the plant, even when faced with a more optimistic weather scenario used by the simulation software than those consulted on platforms that monitor this data in the region.
As a theoretical reference, the NREL PVWatts® calculator was used, a tool widely adopted in the sector to estimate energy production based on local solarimetric data, system characteristics, and historical meteorological series.
The actual generation data was collected directly through the unit's monitoring system, reflecting the plant's real performance under the region's weather conditions.
Comparing these datasets allowed us to quantify the difference between the estimated and actually generated energy, as well as validate the system's performance and its operational efficiency index.
The system analyzed consists of three DHN-SU1K5T-G1 microinverter units, which are associated with 620 W modules. This system features optimized integration between modules and microinverters, as well as MPPT at the module level, significantly increasing system generation and improving system performance, as will be discussed in this article.
To provide context for the reader, the actual solar radiation recorded in the region was 26,7% lower than the indices used in market projections (simulation software). Even so, the monitoring data, together with its projection based on the actual data, indicates an annual generation of 7.848 kWh for the year.
During the same period, the most optimistic simulation scenario at the beginning of the project indicated 7921 kWh, which shows that the system will reach approximately 99% of the estimated target of the most optimistic scenario. This is even considering a solar radiation 26,7% higher than the radiation consulted in CRESESB, which takes into account the irradiation indices of the region.
In the monthly breakdown, for example, the system showed stability, with an average generation of 654 kWh per month between November and January 2025/2026.
According to DAH Solar, one of the factors that contributed to the performance was the use of Solar Unit technology, which arrives pre-dimensioned from the factory, ensuring that the electrical parameters operate within nominal limits and extract maximum generation from the modules, increasing system efficiency.
In the analysis, this model contributed to the system's resilience, especially in the face of external instabilities. During the analyzed period, 263 network failures (overvoltage) associated with the utility company were recorded, without significantly compromising the plant's availability.
Another point highlighted by the company was the performance of the microinverters, which recorded an average production of 7,16 kWh per day per unit, a rate considered superior to market standards.
According to the company, this performance directly contributed to improving the ROI (Return on Investment), accelerating the payback period of the investment.
The company also assessed the plant's performance on days with high rainfall. Even with significant rainfall, the system maintained consistent generation levels.
“We noticed that even on very rainy days the equipment performed well, reaching values close to those of days with low rainfall. It is worth noting that the total generation for the day is still affected by other factors, such as network availability. Monitoring the generation in January, which was a rainy month, we also noted that the system's performance remained above the simulated average, which once again proves the system's effectiveness,” the company highlighted.
"Technical analysis validates that the Lucas Gil Power Plant not only fulfills its promises but exceeds efficiency expectations. It's a solution involving resilient technology capable of extracting maximum profitability, even under unfavorable weather and electrical conditions," the manufacturer concluded.
According to the company, the final analysis also indicated that the plant performed better than expected, especially when comparing the solarimetric data used in the simulations with the actual regional monitoring records (CRESESB).
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