The off-grid solar system is mainly composed of solar modules, mounting brackets, off-grid inverters, batteries, etc. The system will first meets the need of the user's load, and then stores the excess power in the battery for use at night and in rainy days. When the battery is dead, the diesel generator can also be used as a supplementary energy source to supply power to the load.

The design of the off-grid solar system is different from the grid-connected power generation system, which needs to consider the user's load, daily electricity consumption, local climate conditions and other factors. Supplier need to choose different design schemes according to the actual needs of customers. In order to ensure that the off-grid system can work reliably, it is very necessary to do a good job of customer demand investigation in the early stage.

1. Inverter selection. Determine the inverter power according to the user's load power and type

The selection of inverter power should generally not be less than the total load power. But considering the service life of the inverter and subsequent capacity expansion, it is recommended that the inverter power should be considered with a certain margin. In addition, if the load contains inductive loads with electric motors such as refrigerators, air conditioners, water pumps, range hoods, etc. the starting power of the load needs to be taken into account, that is, the starting power of the load should be less than the maximum impact power of the inverter

2. Component capacity determination. Determine the component capacity according to the user's daily electricity consumption and light intensity

Part of the electricity generated by photovoltaic modules during the day is supplied to the load, and the remaining part is used to charge the battery. At night or when the solar radiation is insufficient, the electricity stored in the battery will be discharged to the load for use. It can be seen that in the absence of commercial power or diesel engines as supplementary energy, all the power consumed by the load comes from the power generated by the photovoltaic modules during the day. Considering that the light intensity of different regions will be different in different seasons, in order to ensure the reliable operation of the system, the capacity design of photovoltaic panels should be able to meet the demand even in the season with the worst light.

3. Determination of battery capacity. Determine the battery capacity according to the night power consumption or backup time

The battery of the off-grid solar system is mainly used for energy storage to ensure that the load can work normally when the solar radiation is insufficient. For off-grid solar systems with important loads, the design of battery capacity needs to consider the longest local rainy days. The load power supply requirements of ordinary off-grid solar systems are not high. Considering the cost of the system, the number of rainy days can be ignored, and the use of the load can be adjusted according to the actual light intensity.

Corigy provides a complete set of off-grid solar systems. Welcome to contact us if you have a need.

Corigy’s inverter has the characteristics of long life, safety and stability. Inquire is welcome.