The on-grid solution can convert the DC from solar panels into AC with the same voltage, the same frequency, and the same phase as the grid electricity, and transmit the power to the grid. According to the safety requirements, isolator is required between photovoltaic module and grid-connected inverter, either external switch or built-in switch. In order to ensure the safety and reliability of on-grid solution, a distribution box is required to meet the requirements of distribution systems.

AC coupled solution is combined by AC coupled inverter and grid-connected inverter are combined to form a photovoltaic energy storage system. The non-polar miniature circuit breaker (MCB) changes the opening distance between the dynamic and static contacts and by increasing arc coil, the arc enters the arc extinguishing chamber, thereby cutting off the fault. The energy storage system needs protection during charging and discharging, and non-polar MCB can provide two-way current protection.

Hybrid solution use an inverter to convert DC, control battery charge or discharge period, and balance the requirement of local loads. According to safety requirements, an isolator is needed between solar panel and inverter, either external switch or built-in switch. Battery need to be protected by MCB both charge and discharge period.

The PV system voltage upto 600~1500V. Once fire occurs, firefighters will be exposed to extreme dangers. The firefighter safety switches could provide a safe fire extinguishing environment for firefighters and reduce the fire loss to ensure the safety of PV power stations.

Micro-inverter grid-connected systems makes photovoltaic power generation systems more secure, efficient, and intelligent. However, micro-inverter does not have a screen to display the circuit parameters. A power distribution box customized for the micro-inverter system is required. A electrical box is designed, and can clearly observe the data of smart meter and the power generation status of system.

The energy management system (EMS) solve the problems of peak-to-valley spreads, adjustment of energy storage, and other issues. By optimizing energy storage control, distributed power output, and load switching, etc., the user side's energy management in different operating modes is economically and efficiently realized.