Generally, the peak efficiency of solar inverter (photovoltaic inverter) is 97%-99%, 98%-98.5% for mainstream series, 98.5%-99% for centralized and 94%-96.5% for miniature. Europe/China efficiency (weighted) is usually 96.5%–98%.
I. Efficiency interval of common types (mainstream level in 2025–2026)
Series inverter (most common in household/industry and commerce)
Peak value: 98.0%–98.7%
Europe/China efficiency: 97.2%–98.3%.
Centralized inverter (large ground power station)
Peak value: 98.5%–99.0% (SiC devices can reach 99.3%).
European efficiency: 97.0%–97.8%
Micro inverter (single module, roof)
Peak value: 94%–96.5%
European efficiency: 93%–95%
Energy storage inverter (integrated with and off the grid)
Peak value: 97.5%–98.5%
Comprehensive efficiency of charge and discharge: 96%–97%
Second, the key efficiency indicators
Peak efficiency (Max Efficiency)
The highest efficiency under ideal working conditions (rated power, optimal voltage, normal temperature) is usually the nominal value of the manufacturer.
European efficiency (Euro η)/ China efficiency (China η)
Weighted by different load rates, it is closer to the daily actual power generation performance, which is 0.5%–1.5% lower than the peak value.
MPPT efficiency
The ability to track the maximum power point of photovoltaic is more than 99% for mainstream models and 99.5%+ for high quality.
Third, the main factors affecting efficiency
Load rate: 20%–80% has the highest load efficiency; .
Temperature: For every 10°C increase, the efficiency will decrease by 0.3%–0.5%.
Voltage matching: The higher the matching degree between MPPT voltage range and component voltage, the higher the efficiency.
Devices and topology: SiC/GaN wide band gap devices and three-level topology can significantly improve efficiency.
Fourth, purchase reference
Household/industry and commerce: priority is given to group and string type, with peak value ≥98.3% and China efficiency ≥97.5%.
Large-scale power station: centralized, with peak value ≥98.8% and European efficiency ≥97.2%.
Low light/shadow environment: Select the model with multi-channel MPPT, low load and high efficiency (5% load ≥95%).
