Solar energy system--Relationship between solar panel and battery

The scale and application form of photovoltaic systems are different. For example, the system size span is large, as small as a few watts of solar courtyard lights, as large as the MW -level solar photovoltaic power plant.

The solar power generation system consists of a solar cell group, solar controller, and battery. If the output power supply is 220V or 110V, the inverter needs to be configured. The role of each part is:

(1) Solar panel: Solar panels are the core part of the solar power generation system, and it is also the highest value part of the solar power generation system. Its role is to convert the radiation capacity of the sun into electrical energy, or send it to the battery to store it, or push the load work.

(2) Solar controller: The role of solar controller is to control the working status of the entire system and play a role in charging and discharge protection for batteries. In a place with large temperature differences, the qualified controller should also have the function of temperature compensation. Other additional functions such as optical control switches and time control switches should be the options of the controller;

(3) Battery: Generally, it’s gel battery. In small and micro systems, lithium batteries can also be used. Its role is to store the electric energy emitted by the solar panel when there is light, and then release it when it is needed.

(4) Inverter: In many occasions, 220VAC and 110VAC AC power needs to be provided. Because the direct output of solar energy is generally 12VDC, 24VDC, 48VDC. In order to provide electrical energy to the 220VAC electrical appliances, the DC electrical energy emitted by the solar power system needs to be converted to the transition power energy, so the DC-AC inverter needs to be used.

Before the design of the photovoltaic system, it need to understand and obtain some basic data for calculation and selection: the geographical location of the photovoltaic system, including place, latitude, longitude, and altitude; meteorological data in the region.

I believe some friends will have questions how to configure solar panels and batteries. Generally, the voltage of solar panels is greater than the battery voltage.The solar panel depends on the capacity of the battery. The greater the battery capacity, the greater the power of the panel.

For example, the area receives five hours of sunlight.If 12v lifepo4 100ah battery, it needs about 240W solar panel;

If lifepo4 battery 36v 100ah，it needs about 720W solar panel; if lifepo4 72v 100ah battery, it needs about 1440W solar panel

Of course, if you have a large off-grid inverter system that requires larger solar panels, like 4000 Watt solar panel or 5000 Watt solar panel. We will have professional engineers to provide you with professional configuration for your reference. Don't worry about the price of large solar panels. We are the factory and we will offer you the most competitive price.