In one aspect the present disclosure provides a system for charging electric vehicles both AC and DC using only two conductors comprising a cable having two ends one of which is attached to a connector and the other end to a plug and only two charging conductors that extend from one end of the cable to the other and either, one or more switches to receive the current from an AC or DC input and direct it based on a type of the current to an AC or DC output and to stop the current if the corresponding port is not available. The system also has a control mechanism for preventing the delivery of the current to the wrong port of the connector.

One or more battery sub-modules are selected by obtaining at least one voltage from each battery sub-module and selecting based at least in part on the obtained voltages. The battery sub-modules are electrically connected in series in order to provide power to a primary load. Each battery sub-module includes a plurality of cells electrically connected in series and each battery sub-module further includes a battery management system that monitors the cells in that battery sub-module. Those battery management systems in the selected sub-modules are turned off so that the battery management systems in the selected sub-modules do not consume power at least temporarily from the cells in the selected sub-modules while (1) the battery sub-modules are not providing power to the primary load and (2) the battery sub-modules are not being charged.

Technology for a mobile repeater operable to operate in a low power mode is disclosed. The repeater can comprise of detecting an uplink signal from one or more mobile devices for a selected period of time. The repeater can comprise of setting the mobile repeater to the low power mode when the uplink signal is not detected within the selected period of time to reduce a power draw. Wherein setting the mobile repeater to the low power mode comprises turning off one or more signal chain components in one or more signal chains including at least one power amplifier (PA) to reduce a power draw of the mobile repeater. Wherein the one or more signal chain components further comprises a low noise amplifier (LNA); a gain block; or a variable attenuator.

A power storage system includes a plurality of power storage apparatuses and a control apparatus. The plurality of power storage apparatuses are connected in parallel to each other via respective switches. The control apparatus controls the switches, based on respective voltage values of the plurality of power storage apparatuses and respective resistance values of conductive paths of the plurality of power storage apparatuses. The control apparatus charges or discharges at least one of the plurality of power storage apparatuses.

A fire spreading prevention method in an energy storage system (ESS) composed of a plurality of battery racks including an individual battery rack fire detection step of detecting whether a fire occurs for each of the plurality of battery racks and a battery rack forced discharge step of forcibly discharging at least some of the plurality of battery racks when a fire is detected in the individual battery rack fire detection step.

There are provided methods and systems for operating battery packs. One example method includes obtaining voltages of batteries of the battery pack, which includes a plurality of the batteries connected to a circuit. The method also includes obtaining an output current to be output from the battery pack and selecting a subset of the batteries capable collectively of providing the output current. The subset includes one or more selected batteries selected from among the plurality of the batteries. The subset has a subset voltage being substantially similar to a voltage of each of the selected batteries. The subset may be selected such that the selected batteries have substantially similar voltages and the subset voltage is maximized. The method also includes drawing the output current from the subset of the batteries. Other methods and systems for operating a battery pack are also provided.

A system includes one or more assets loaded into and/or removed from a vehicle. Each asset is coupled to a wireless tag, and each wireless tag wirelessly transmits beacon signals at predetermined intervals. The system includes a gateway disposed within the vehicle. The gateway is configured to receive power from a vehicle power source when the vehicle is operating, and the gateway is configured to receive power from an internal battery source when the vehicle is not operating. The gateway is configured to scan an area of the vehicle at a duty cycle to identify beacon signals transmitted by the wireless tags and receive the beacon signals from the wireless tags.

A computer implemented method includes accessing a first status of a first battery pack interface coupled to a load via a first load switch and accessing a second status of a second battery pack interface coupled to the load via a second load switch. The first status and the second status are compared and the first and second load switches are controlled based on the comparing to balance remaining capacities of the first and second battery packs.

The charging system comprises: two chargers (2a, 2b) which deliver instantaneous electrical energy for charging an electric vehicle, with different electrical charging characteristics, two electrical lines (16a, 16b), each connecting one of the two chargers (2a, 2b) to a plurality of charging points (4), each serving a charging space (5), a switching system (6) which is associated with each charging point (4) and which connects or does not connect an electric vehicle to the first or the second charger (2), such that each charger (2a, 2b) is connected at most to one charging point (4), and a control system (8) which controls the switching system (6).

An energy system includes an energy storage device and a link device. The energy storage device includes a housing and a battery disposed within the housing. The battery has a first chemistry. The link device is configured to facilitate electrically coupling the energy storage device to an external battery having a second chemistry different than the first chemistry, receive input power from the external battery, and regulate a power profile of the input power received from the external battery such that the energy storage device can accept the input power from the external battery. The energy storage device is configured to receive the input power from the external battery having the second chemistry through the link device and provide output power to a load using the input power received from the external battery having the second chemistry.