Thermal management systems for marine vessels

A thermal management system for a marine vessel, the thermal management system comprising:

• an open loop circuit;
• a first pump that pumps water from the body of water in which the marine vessel is operating, through the open loop circuit, and back to the body of water;
• a closed loop circuit including a first path and a second path parallel to each other;
• a second pump that pumps a heat transfer fluid through the closed loop circuit;
• a heat exchanger configured to exchange heat between the water and the heat transfer fluid;
• a radiator configured to exchange heat between the heat transfer fluid and atmosphere;
• a plurality of components downstream of the heat exchanger, upstream of the radiator, and each cooled or heated by the heat transfer fluid, wherein the plurality of components comprises a battery and a battery charger, and wherein at least two components within the plurality of components are provided in parallel so as to be cooled or heated independently of each other;
• one or more valves configured to select between conveying the heat transfer fluid via the second path of the closed loop circuit to the radiator and via the first path in the closed loop circuit to bypass the radiator to vary the cooling or heating of at least a portion of the plurality of components;
• and
• a control system and a program executable thereby for operating the one or more valves based upon whether the marine vessel is out of the body of water and whether the battery charger is charging the battery.