Electric marine propulsion system and control method

An electric marine propulsion system configured to propel a marine vessel, the system comprising:

• a power storage system comprising at least one battery;
• at least one electric motor powered by the power storage system and configured to rotate a propulsor to propel the marine vessel;
• a control system configured to:
• identify a temperature for each of the at least one battery;
• identify a maximum power limit for each of the at least one battery;
• determine a system temperature offset for the power storage system based at least in part on the temperature and the maximum power limit for each of the at least one battery, wherein determining the system temperature offset comprises outputting a power offset value for each of the at least one battery from a temperature and power buffer map;
• apply the system temperature offset to a system power limit for the power storage system to calculate a temperature compensated system power limit for the power storage system;
• and
• control the at least one electric motor based at least in part on the temperature compensated system power limit.