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The solar photovoltaic power generation system consists of solar battery packs, solar controllers, and batteries (groups). If the output power is AC 220V or 110V, an inverter is also required.

The functions of each component of the solar photovoltaic power generation system are:

(1) Solar panel: The solar panel is the core part of the solar power generation system, and it is also the most valuable part of the solar power generation system. Its function is to convert the sun’s radiation ability into electrical energy, or store it in the battery, or promote work load.

(2) Solar controller: The function of the solar controller is to control the working state of the whole system, and to protect the battery from over-charging and over-discharging. In places with large temperature differences, qualified controllers should also have the function of temperature compensation. Other additional functions such as light control switch and time control switch should be optional options of the controller.

(3) Battery: generally lead-acid battery, nickel metal hydride batteries, nickel-cadmium batteries or lithium batteries can also be used for small and micro system. Its function is to store the electric energy from solar panels when there is light, and release it when needed.

(4) Inverter: The direct output of solar energy is generally 12VDC, 24VDC, 48VDC. In order to provide power to 220VAC electrical appliances, it is necessary to convert the DC power generated by the solar power generation system into AC power, so a DC-AC inverter is required.

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