The European market for leisure marine outboard motors sees 200,000 sales per year and is worth US$900m. It is forecast that 74% of outboard motor sales in Europe will be electric by 2030. B1 modular battery solution and controllersAlongside its D1 inboard and prototype S1 outboard, Propel will also present its modular B1 battery solution at METS. An advanced motor controller is integrated on top of the electric motor, sharing the cooling system and connected by bus bars. A dedicated test programme for the Propel S1 included the use of a special purpose-built rig for outboard motor endurance and load testing at Silverstone.