A power management and selection system for a class 8 tractor trailer, directs excess solar and vehicular charge capacity to an auxiliary load by measuring available charge capacity from a reefer power system including a reefer battery, solar panel and charge controller for moderating solar power to the reefer batter, and measuring available charge capacity from a cab vehicle power system including a propulsion system battery and alternator. Charge logic, in a selector configured for switching charge capacity to the auxiliary load, determines which of the reefer power system and cab vehicle power system has the most potential excess charge capacity, and directs the determined excess charge capacity to the auxiliary load, while the measured available charge capacity remains sufficient for powering the respective reefer power system or cab vehicle power system.

A power control system, configured to exchange electric power with a battery pack, comprising: a power conversion device; and a controller, wherein the battery pack is configured to output a variation of a state-of-charge value among cells to the controller, the variation being determined based on at least one of a detection result from a voltage sensor or a detection result from a current sensor, and the controller is configured to control the power conversion device such that a maximum state-of-charge value among a plurality of the state-of-charge values of the cells is lower than an upper limit of a predetermined state-of-charge range and a minimum state-of-charge value among the state-of-charge values of the cells is higher than a lower limit of the predetermined state-of-charge range, the maximum state-of-charge value and the minimum state-of-charge value being values based on the variation.

A footwear system can employ a brake and/or a clutch, such as a one-way clutch, to convert human motion into usable electricity. The brake and one-way clutch can be used together, such as on opposite ends of a spring. During a storage phase, the brake can be engaged and the one-way clutch disengaged so the spring stores an energy. After the storage phase, the brake can be removed to initiate the release phase since the brake is not stopping the spring, but the one-way clutch allows the stored energy to be released.

Electrical power systems having variable-voltage DC busses and methods of controlling voltage settings of such busses. One electrical power system comprises: a variable-voltage DC bus; a number N≥2 of electrical machines, each electrical machine connected to the variable-voltage DC bus via one of a corresponding number N of converters, each electrical machine and corresponding converter having an index n=(1, . . . , N); and a controller configured to select a voltage setting V.sub.dc_bus for the variable-voltage DC bus and to provide control signals to the converters to control the voltage setting of the variable-voltage DC bus according to the selected voltage setting V.sub.dc_bus. The controller configured to select a voltage setting V.sub.dc_bus greater than or equal to a minimum voltage requirement V.sub.dc_min for the bus. The controller is configured to determine the minimum voltage requirement V.sub.dc_min using present operating speeds of each of the N electrical machines.

A system for monitoring and optimizing fuel consumption by a genset at an oil rig is described. Gensets require large amounts of fuel to initiate and to maintain in a standby, idling position. The system accesses data in a drill plan to determine the present and future power requirements and initiates gensets if needed; otherwise gensets can be shut down. Excess power can be stored in a power storage unit such as a capacitor, battery, or a liquid air energy storage unit.

An apparatus, including a first circuit which contains a first load which does not draw current from a first battery when the first load is not operating, and further wherein the first load comprises an electric motor of an electric vehicle or a hybrid vehicle; a second circuit which contains a second load which draws current from a second battery when the first load is not operating or is non-operational; a first switch which is capable of disconnecting the first battery from the first circuit; a second switch which is capable of connecting the first battery to the first circuit, wherein the first switch and the second switch are connected in series; and at least one recharge which recharges the first battery and the second battery when the first load is operating.

The present disclosure provides a portable power generating system configured to utilize self-sustained energy to provide velocity and movement to turn a central tubular axle which is encompassed by two or more magnets spread evenly around the circumference of the axle to generate motion. The motion of the revolving magnets turns the armature of one or more DC power generating motors which in turn produce electricity. The central tubular axle supported by two DC power generating motors are connected to each end of the central tubular axle. One of the DC power generating motors revolves in a clockwise direction during operation and the DC power generating motor at the opposite end of the central tubular axle is configured to operate in an anti-clockwise motion during operation.

To provide an electric vehicle capable of reducing heat generation of the switching elements while achieving energy saving, the electric vehicle includes: an engine 11; a first generator 12 driven by the engine; a first rectifier circuit 14 connected to the output of the first generator; a first DC line 16 to receive the DC output of the first rectifier circuit; a driving motor 10 connected to the first DC line; a power converter 20 configured to convert voltage of the first DC line; a second DC line 34 to receive the DC output subjected to voltage conversion by the power converter; an auxiliary device 33 connected to the second DC line; and a controller 40 configured to control the power converter. The controller is configured to, in response to the voltage V.sub.i of the first DC line becoming equal to or less than a first threshold V.sub.c, control the output power P.sub.o of the power converter to a rated power P.sub.1, and in response to the voltage becoming larger than the first threshold, control the output power P.sub.o to be smaller than the rated power.

An apparatus, including a first circuit which contains a first load which does not draw current from a first battery when not operating, and includes an electric motor of an electric vehicle, all-electric vehicle, or hybrid vehicle; a second circuit which contains a second load which draws current from a second battery when the first load is not operating or is non-operational; a first switch which is capable of disconnecting the first battery from the first circuit; a second switch which is capable of connecting the first battery to the first circuit; and at least one recharger which is capable of recharging the first battery and the second battery when the first load is operating. The apparatus is capable of providing electrical power to the second load when the at least one recharger ceases to operate or becomes non-operational.

A battery system includes a controller that performs a calculation to calculate an internal resistance of a battery, and executes a predetermined operation based on the result. The calculation includes obtaining a regression line through a regression analysis of a current-voltage plot obtained from voltage sensor and current sensor, and calculating the internal resistance from a slope of the regression line. The controller calculates a first internal resistance through the calculation based on a first group of detection values of the voltage and current detected a plurality of times, and calculate a second internal resistance through the calculation based on a second group of detection values. The controller executes the predetermined operation when a resistance difference between the first and second internal resistances is smaller than a reference value, and does not execute the operation when the resistance difference is larger than the reference value.