SMA DC-DC CONVERTER - Greater efficiency for large PV power plants


The new SMA DC-DC converter allows designers to increase their PV power plant’s yields by oversizing the DC array without compromising energy losses. This is accomplished with the new DC-coupling option and the generous DC–AC ratios of the Sunny Central EV inverter series. The inverter can intelligently control the flow of power for many different use-cases, including clipped-loss capturing. The stored energy can be fed in at attractive times, for example, in the morning or at night, to achieve a better price-point for the energy. Grid operators are able to benefit from grid services, such as frequency control or time-based feed-in schedules. Up to six DC-DC converters can be connected and operated simultaneously on the Sunny Central inverter. This minimizes battery short-circuits currents for high energy applications and avoids the need for additional and expensive protection measures inside the battery container.


  • Wide range for battery and PV voltage
  • Scalable
  • Retrofittable (storage solution can be integrated anytime)

4-quadrant operation

  • Step-up/step-down converter with battery charge/discharge function
  • Limits high short-circuit currents of the battery
  • Compatible with 1,500-V batteries

Integrated solution

  • Intelligent power flow control of the system in the Sunny Central
  • Coordinated protection concept with Sunny Central
  • Uniform warranty and service concept


  • Enables new business models
  • High efficiency at different DC voltages as well as partial and full load
  • Overnight charging/discharging