Multi-dredge electric dredges are powerful floating units operating in placer deposits for mining gold, platinum and other minerals. The modes of operation of electric drives of the main mechanisms of the dredge are not studied sufficiently yet.In the present article as a result of analysis of the constructed and taken from nature load diagrams, a possible method of selection of the power of the main electric motor of the dredge - the motor of its scoop chain is offered.