A pre-charging and voltage supply system for a DC-AC inverter, comprising: a first battery having a first anode and a first cathode, the first battery adapted to generate a first voltage level between the first anode and the first cathode; a contactor electrically coupled in series with and between the first anode and an electrical node; a first voltage sensor electrically coupled between and to the electrical node and the first cathode, the first voltage sensor adapted to generate a first voltage signal (V L) indicative of a voltage level between the electrical node and the first cathode; a DC-DC voltage converter electrically coupled between and to the electrical node and the first cathode; a second battery having a second anode and a second cathode, the second anode electrically coupled to the DC-DC voltage converter, the second battery adapted to generate a second voltage level between the second anode and the second cathode, the second voltage level being less than the first voltage level; a microprocessor operably coupled to the first voltage sensor and the DC-DC voltage converter, the microprocessor programmed to generate a first control signal to induce the DC-DC voltage converter to increase a voltage level between the electrical node and the first cathode, utilizing the second voltage level from the second battery; and the microprocessor further programmed to generate a second control signal to induce the contactor to transition a contact from an open operational position to a closed operational position such that the first voltage level from the first battery is applied to the DC-AC inverter, if the voltage level between the electrical node and the first cathode is greater than a threshold voltage level, characterized in that the pre-charging and voltage supply system further comprises a second voltage sensor electrically coupled in parallel with the first battery, the second voltage sensor adapted to generate a second voltage signal (V P) indicative of the first voltage level; that the microprocessor is further operably coupled to the second voltage sensor and is further programmed to receive the second voltage signal (V P) indicative of the first voltage level from the second voltage sensor, determine the first voltage level from the second voltage signal (V P) and determine the threshold voltage level by multiplying the first voltage level by 0.9. a first battery having a first anode and a first cathode, the first battery adapted to generate a first voltage level between the first anode and the first cathode; a contactor electrically coupled in series with and between the first anode and an electrical node; a first voltage sensor electrically coupled between and to the electrical node and the first cathode, the first voltage sensor adapted to generate a first voltage signal (V L) indicative of a voltage level between the electrical node and the first cathode; a DC-DC voltage converter electrically coupled between and to the electrical node and the first cathode; a second battery having a second anode and a second cathode, the second anode electrically coupled to the DC-DC voltage converter, the second battery adapted to generate a second voltage level between the second anode and the second cathode, the second voltage level being less than the first voltage level; a microprocessor operably coupled to the first voltage sensor and the DC-DC voltage converter, the microprocessor programmed to generate a first control signal to induce the DC-DC voltage converter to increase a voltage level between the electrical node and the first cathode, utilizing the second voltage level from the second battery; and the microprocessor further programmed to generate a second control signal to induce the contactor to transition a contact from an open operational position to a closed operational position such that the first voltage level from the first battery is applied to the DC-AC inverter, if the voltage level between the electrical node and the first cathode is greater than a threshold voltage level, characterized in that the pre-charging and voltage supply system further comprises a second voltage sensor electrically coupled in parallel with the first battery, the second voltage sensor adapted to generate a second voltage signal (V P) indicative of the first voltage level; that the microprocessor is further operably coupled to the second voltage sensor and is further programmed to receive the second voltage signal (V P) indicative of the first voltage level from the second voltage sensor, determine the first voltage level from the second voltage signal (V P) and determine the threshold voltage level by multiplying the first voltage level by 0.9.