Within the German flagship project H2Mare the consortium PtX-Wind is developing experimental, research and production offshore & off-grid PtX platforms that are directly coupled to wind turbine.

Together with industrial & academic partners the main task at the DFI focuses on dimensioning a battery storage system for a PtX research platform, comprising a 5 MW electrolyzer & 1.7 MW PtX plant. During wind calms, however a redundant energy supply system for emergency and stand-by operations is required. In this project, technical and economic feasibility of CO2 emission-free systems such as batteries are evaluated. Therefore, suitable battery technologies such as PbAc, PbGel, LFP, NMC and supercapacitors have been tested to verify the properties provided by the manufacturer. The performance of some pre-selected candidates at module level (0.5 kWh, PbAc, PbGel, LFP) will be presented. Combined with a year-round wind farm power profile, the battery properties were implemented into the software “System Advisor Model (SAM)”1. For the stand-by/emergency operation (0.47 MW) during wind calm period up to 3 hours, a minimal battery size (0.52 MWh) that is supposed was determined, based on the 1C rate capability of state-of-the-art LFP batteries. Economic considerations on battery size for longer wind calm periods and eventual short-term support of PtX operation will be presented.