Common design problems with off-grid systems
PhotovoltaicOff-grid systemThere is no uniform specification, it should be designed according to the needs of users, mainly considering components,InverterSelection and calculation of controllers, batteries, cables, switches and other equipment. Before the design, the pre-work should be done well. You need to understand the user's load type and power, the climatic conditions of the installation site, the user's electricity consumption, and the requirements to be clear before you can do a good job.
1. The voltage of the component and the voltage of the battery should be matched. The PWM type controller solar module and the battery are connected by an electronic switch, and there is no device such as inductance in the middle. The voltage of the component is between 1.2-2.0 times of the voltage of the battery. It is a 24V battery, the input voltage of the component is between 30-50V, the MPPT controller has a power switch tube and an inductor circuit in the middle. The voltage of the component is between 1.2-3.5 times of the voltage of the battery. If it is a 24V battery, The component input voltage is between 30-90V.
2, the output power of the component and the power of the controller should be similar, such as a 48V30A controller, the output power is 1440VA, the power of the component should be around 1500W. selectControllerWhen you first look at the voltage of the battery, and then divide the component power by the voltage of the battery, it is the output current of the controller.
3. If the power of one inverter is not enough, multiple inverters need to be connected in parallel. The output of the photovoltaic off-grid system is connected to the load. The voltage and current phase and amplitude of each inverter output are different. If the inverter outputs Parallel connection, add inverter with parallel function.
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