Hybrid power system

A marine hybrid power system comprising:

• an internal combustion engine,
• a gear box having an input connectable to the engine and an output shaft to drive a marine vessel,
• a first power drive and take off external of the gear box and connected to the gear box input to provide a releasable drive connection to and from the gear box input,
• at least one motor/generator connectable to the first power drive and take off,
• and
• a battery electrically connected to the at least one motor/generator to power or be charged by the at least one motor/generator wherein:
• the gear box provides forward, neutral and reverse operation;
• a second power drive and take off external of the gearbox is connected to the gear box output shaft to provide a releasable drive connection to and from the gear box output shaft;
• said at least one motor/generator is connectable to a respective one of the first and second power drive and take offs;
• a connecting clutch provides a releasable drive connection between the first and second power drive and take offs;
• and
• the gear box input is selectively connected to the gear box output shaft by controlling said releasable drive connections, bypassing the gear box, and the at least one motor generator is selectively connected to the gear box input or output shaft, bypassing the gear box.