Electric vehicle

An electric vehicle and trailer assembly, comprising:

• a vehicle support frame;
• at least one drive wheel rotatably connected to said vehicle support frame;
• a main battery carried by said vehicle support frame;
• a motor-generator carried by said vehicle support frame for operatively rotating said drive wheel during acceleration of said vehicle, and for generating electricity during braking of said vehicle, said motor-generator being in electrical communication with said main battery;
• a controller associated with said vehicle support frame for controlling operation of said motor-generator;
• and
• a trailer which is detachably and releasably connectable to said electric vehicle, said trailer comprising:
• a trailer body which is detachably connectable to said vehicle support frame;
• a sub-battery carried by said trailer body, said sub-battery being in electrical communication with said motor-generator;
• wherein, during acceleration of said vehicle, said controller operates to draw power primarily from said sub-battery, to drive said motor-generator, until a charge state of said sub-battery falls below a first predetermined level, at which time said controller switches to draw power from said main battery to drive said motor-generator;
• and further wherein, during regenerative braking of said vehicle, said controller operates to send power, from said motor-generator, primarily to said main battery, until a charge state of said main battery exceeds a second predetermined level, at which time said controller operates to send power from said motor-generator to said sub-battery.