Abstract: A parallel operation connecting device includes a control switch, a concentrator, a first connector and a second connector; the concentrator is connected between an alternating current power supply and the first connector and the second connector to form two identical alternating current lines, and on-off of both the two alternating current lines is controlled by the control switch; the control switch is configured to simultaneously switch on the two alternating current lines when the first connector is connected to the first energy storage inverter and the second connector is connected to the second energy storage inverter and simultaneously switch off the two alternating current lines when the first connector is disconnected from the first energy storage inverter and/or when the second connector is disconnected from the second energy storage inverter.

Abstract: A parallel operation connecting device includes a control switch, a concentrator, a first connector and a second connector; the concentrator is connected between an alternating current power supply and the first connector and the second connector to form two identical alternating current lines, and on-off of both the two alternating current lines is controlled by the control switch; the control switch is configured to simultaneously switch on the two alternating current lines when the first connector is connected to the first energy storage inverter and the second connector is connected to the second energy storage inverter and simultaneously switch off the two alternating current lines when the first connector is disconnected from the first energy storage inverter and/or when the second connector is disconnected from the second energy storage inverter.

Abstract: A photovoltaic weak current eliminating circuit includes a discharge triggering module, a locking module, a discharge unlocking module and a discharge module. When output voltage of the photovoltaic input source is greater than a preset voltage, the discharge triggering module outputs a first control signal that is kept by the locking module to control the discharge module to discharge the energy of the photovoltaic input source. Accordingly, the stability of the energy storage power supply can be improved. After the discharge module operates, the discharge unlocking module controls the discharge triggering module to output a second control signal if the output voltage of the photovoltaic input source is greater than the preset voltage, so as to stop the operation of the discharge module. Accordingly, the utilization ratio of the photovoltaic input source can be improved.