A method of dedicated circuit verification using a monitoring system includes measuring current at circuit breaker, comparing breaker current with microinverter current generated from one or more solar panels and determining whether they are within a threshold amount of one another, and generating an output based on the comparison.

The application provides an access control method of parallel direct current power supplies and a device thereof. Direct current power supplies with single insulation resistances to ground failing to meet a first preset condition or causing a total insulation resistances to fail to meet a second preset condition are disconnected from a grid-connected inverter, and direct current power supplies with single insulation resistance to ground meeting the first preset condition and enabling the total insulation resistance to meet the second preset condition are connected with the grid-connected inverter for grid-connected inverting. Unlike in conventional technology, not all the direct current power supplies connected to a direct current bus are made stop outputting, thereby avoiding the loss of inverter power generation.

The disclosure relates to a device for electrolysis from photovoltaically generated DC power, including an electrolyzer and a DC/DC converter. The DC/DC converter is configured to feed DC power to the electrolyzer via a DC bus, wherein: the DC power is generated by a photovoltaic (PV) sub-generator connected to the DC/DC converter. The PV sub-generator is connected to the DC/DC converter via a first disconnector that is coupled to an isolation monitoring structure in such a way that closure of the first disconnector requires a successful check for sufficient isolation of the PV sub-generator. The PV sub-generator has a main string and a second disconnector arranged between the main string and the first disconnector. The second disconnector is coupled to a fault current monitoring circuit of the main string in such a way that the second disconnector is opened in the event that a predefinable limit value of the fault current is exceeded. The disclosure also relates to a method.

The disclosure relates to a device for electrolysis from photovoltaically generated DC power, including an electrolyzer and a DC/DC converter. The DC/DC converter is configured to feed DC power to the electrolyzer via a DC bus, wherein: the DC power is generated by a photovoltaic (PV) sub-generator connected to the DC/DC converter. The PV sub-generator is connected to the DC/DC converter via a first disconnector that is coupled to an isolation monitoring structure in such a way that closure of the first disconnector requires a successful check for sufficient isolation of the PV sub-generator. The PV sub-generator has a main string and a second disconnector arranged between the main string and the first disconnector. The second disconnector is coupled to a fault current monitoring circuit of the main string in such a way that the second disconnector is opened in the event that a predefinable limit value of the fault current is exceeded. The disclosure also relates to a method.

A lighting apparatus includes a wireless circuit board, a driver circuit board, a light source plate, a metal cover and a metal housing. The wireless circuit board is mounted with a wireless circuit. The wireless circuit has a first reference ground terminal. The driver circuit board is mounted with a driver circuit. The driver circuit has a second reference ground terminal. The light source plate is mounted with a LED module. The light source plate is placed on a top side of the metal cover. The first reference ground terminal and the second reference ground terminal are connected to the metal cover as a reference ground. The metal housing and a bottom side of the metal cover forms a container space for holding the driver circuit board and a first portion of the wireless circuit board.

A lighting apparatus includes a wireless circuit board, a driver circuit board, a light source plate, a metal cover and a metal housing. The wireless circuit board is mounted with a wireless circuit. The wireless circuit has a first reference ground terminal. The driver circuit board is mounted with a driver circuit. The driver circuit has a second reference ground terminal. The light source plate is mounted with a LED module. The light source plate is placed on a top side of the metal cover. The first reference ground terminal and the second reference ground terminal are connected to the metal cover as a reference ground. The metal housing and a bottom side of the metal cover forms a container space for holding the driver circuit board and a first portion of the wireless circuit board.

Methods and systems for connecting a photovoltaic module and an inverter having an input capacitor are presented. The photovoltaic system includes a maximum power point tracking (MPPT) controller coupled between the inverter and the photovoltaic module. The MPPT controller includes a direct current (DC) converter configured to reduce, in a forward buck mode, a voltage of the photovoltaic module, to supply power from the photovoltaic module to the input capacitor of the inverter. The photovoltaic system also includes a microcontroller unit (MCU) configured to control the DC converter to allow the photovoltaic module to operate at a maximum power point, and to increase, in a reverse boost mode, a voltage of the input capacitor of the inverter, to dissipate power from the input capacitor in the photovoltaic module, and the MPPT controller is configured to, based upon one or more triggers.

A portable electronic device includes one or more bumpers that are operable to transition between a stowed position and a deployed position. In the deployed position, the bumpers may be proud of one or more surfaces of the portable electronic device that the bumpers are not proud of in the stowed position. The bumpers may protect the surfaces from impact when proud of those surfaces if the portable electronic device contacts a surface, such as when the portable electronic device is dropped. The bumpers may form portions of side corners or other portions of the portable electronic device in the stowed position. In transitioning from the stowed position to the deployed position, the bumpers may rotate and/or translate.

A power supply control device includes: a first system configured to supply electric power from a first power supply to a first load group; a second system configured to supply electric power from a second power supply to a second load group; a plurality of load switches configured to switch an electric power supply to each load of the first load group and the second load group; and a control unit configured to control the plurality of load switches such that electric power is supplied from the second power supply to a backup load included in at least one of the first load group and the second load group in a predetermined backup state, wherein the control unit detects a state of charge of the second power supply, and increases, in the predetermined backup state, number of the load switches to be connected as the state of charge is higher.

A power supply control device includes: a first system configured to supply electric power from a first power supply to a first load group; a second system configured to supply electric power from a second power supply to a second load group; a plurality of load switches configured to switch an electric power supply to each load of the first load group and the second load group; and a control unit configured to control the plurality of load switches such that electric power is supplied from the second power supply to a backup load included in at least one of the first load group and the second load group in a predetermined backup state, wherein the control unit detects a state of charge of the second power supply, and increases, in the predetermined backup state, number of the load switches to be connected as the state of charge is higher.