The growing share of solar energy on the worldwide power generation leads to high demands on the components in terms of economy, efficiency and reliability. For a better economy there is a demand for DC voltages up to 1500 V with the advantage of lower currents at same power. Lower current leads to reduced losses and costs of material. The impact on the inverter is answered in this work: There is an increase of 1.3 % in weighted efficiency, compared to the state of the art. Additionally, the initial costs of the inverter decrease. The improvement is reached by a new topology for solar central inverters. The topology is named "double inverter". At a given input voltage, the inverter increases the output voltage leading to a significant reduction in losses. In a further extension of the inverter, efficiencies up to 99.2 % are reached. The high value of efficiency is reached without using SiC-semiconductors - only commercially available semiconductor modules are used for the new topology. Before determining the most economic inverter, known topologies for solar central inverters up to 1500 V are compared and preselected. For the preselected topologies, design rules for semiconductors, capacitors and inductors are elaborated. The results of this contribution are not only given theoretically, but also proven by measurements on prototypes in the power range of 100 - 432 kVA. For the chosen topologies, prototypes are designed, built up and brought into operation.