The project aims to demonstrate an energy payback time (EPBT) < 1 year for a grid-connected installation with polymer solar cells. For this purpose we have built a solar park covering 1000 m2 and comprising durable wooden scaffolds, replaceable polymer solar cell foils, and systems for fast installation and de-installation of the foil. The key enabling factor is the solar foil rolls holding several ten thousands of serially connected solar cells exiting our roll-to-roll manufacturing in a condition ready for installation. The interconnecting scheme provides lean two-point contacting but also high voltages once rolled out. We have named this concept INFINITY. INFINITY has allowed us to demonstrate installation at 0.25 kWpeak/min. and 3000 hours operation with only the degradation anticipated from the bird-dropping effect. The operation confirms INFINITY’s high robustness towards shadowing predicted by our models. EPBT for the installation is ~ 16 month and 10 ½ months if operated in Southern Europe, both based on an operational life for the foil of 1 year. With a more realistic but still conservative estimate for the foil’s durability of 2 years, EPBT is reduced to 12 month (Denmark) and 8 ½ months (Southern Europe).