FLX Pro 15 / FLX Pro 17 Three-phase inverters for small to medium-sized PV systems The new line of three-phase inverters is the ideal solution for small to medium-sized PV systems. The inverters feature easy installation, high yields, simple commissioning and operation, integrated power management and excellent flexibility in PV system design.The new, simplified installation concept offers exceptional ergonomics and unrestricted access to the installation area. Weighing no more than 39 kilograms, the inverters are very easy to handle and install.