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Solar energy will be one pillar of the energy supply of the future. Grid-connected photovoltaic systems will thus generate more than 10% of the electrical energy by 2020. Due to the peak power and decentral nature of PV energy a large amount of PV power can be easily integrated into the grid without costly measures like additional power lines. However, in future power supply networks renewable energy sources must be integrated into the grid control. Consequently, solar inverters must be able to contribute to stabilizing and supporting the grid.

In order to achieve the 10 % share of electrical energy, costs of PV energy must decrease significantly within the next decade. One approach for price reduction is highest efficiency. Therefore, increasing efficiency is a constant challenge in the field of PV inverter development.

The progress from design to efficiency and other trends in PV inverters are pointed out in this paper.