System for supplying power to an AC load from a plurality of DC voltage sources (1, 2), comprising: - a first pulse width modulation inverter including: - two input terminals intended to be connected to a first DC voltage source; - two switches connected in series (111, 112) between the two input terminals of the first inverter; - an output connected to a connection node between said switches of the first inverter; - a second pulse width modulation inverter including: - two input terminals intended to be connected to a second DC voltage source; - switches connected in series (211, 212) between the two input terminals of the second inverter; - an output connected to a connection node between said switches of the second inverter, this output being at the same potential as the output of the first inverter; - a control circuit configured to control the switches of the first and second inverters (11, 12) in pulse width modulation mode, such that the first and second inverters alternately supply power to said outputs during one and the same half-cycle of the AC voltage to be generated on said outputs; the power supply system being characterized in that - a shared input terminal forms one of said input terminals of the second inverter and one of said input terminals of the first inverter and in that - a shared switch forms one of said switches connected in series of the first inverter and one of said switches connected in series of the second inverter. - a first pulse width modulation inverter including: - two input terminals intended to be connected to a first DC voltage source; - two switches connected in series (111, 112) between the two input terminals of the first inverter; - an output connected to a connection node between said switches of the first inverter; - two input terminals intended to be connected to a first DC voltage source; - two switches connected in series (111, 112) between the two input terminals of the first inverter; - an output connected to a connection node between said switches of the first inverter; - a second pulse width modulation inverter including: - two input terminals intended to be connected to a second DC voltage source; - switches connected in series (211, 212) between the two input terminals of the second inverter; - an output connected to a connection node between said switches of the second inverter, this output being at the same potential as the output of the first inverter; - two input terminals intended to be connected to a second DC voltage source; - switches connected in series (211, 212) between the two input terminals of the second inverter; - an output connected to a connection node between said switches of the second inverter, this output being at the same potential as the output of the first inverter; - a control circuit configured to control the switches of the first and second inverters (11, 12) in pulse width modulation mode, such that the first and second inverters alternately supply power to said outputs during one and the same half-cycle of the AC voltage to be generated on said outputs; - a shared input terminal forms one of said input terminals of the second inverter and one of said input terminals of the first inverter and in that - a shared switch forms one of said switches connected in series of the first inverter and one of said switches connected in series of the second inverter. - a shared switch forms one of said switches connected in series of the first inverter and one of said switches connected in series of the second inverter.