Buoyant force conversion device and method

An energy conversion device, comprising:

• a container body configured to hold a liquid;
• a housing affixed above the container body by a handler connected to a surface of the container body, wherein a primary roller is configured to rotate at a first end of the housing and a free roller is configured to rotate at a second end of the housing;
• a piston attached at a first end to an outer perimeter of the primary roller, wherein the piston is secured to allow vertical motion of the piston and restrict horizontal and rotational motion of the piston;
• an inflatable balloon attached to a second end of the piston within the container body, wherein the inflatable balloon is configured to drive the piston in an upward direction in response to a buoyant force exerted on the inflatable balloon by the liquid, wherein vertical movement of the piston causes the primary roller to rotate and the inflatable balloon moves in a downward direction due to gravitational forces;
• an air chamber attached to the container body, wherein the air chamber is configured to supply air to a lower opening in the inflatable balloon via a balloon valve connecting the air chamber to the lower opening in the inflatable balloon when the inflatable balloon is in a lowered position;
• and
• an interconnect located on a side of the free roller.