Choose the right solar off grid power generation system under 4 conditions

Off grid solar power generation systems are widely used in remote mountainous areas, non-electric areas, islands, communication base stations and other applications. The system is generally composed of photovoltaic arrays composed of solar cell components, solar charge and discharge controllers, battery packs, off grid inverters, DC loads and AC loads. The photovoltaic array converts solar energy into electrical energy under the condition of illumination, and supplies power to the load through the solar charge and discharge controller, and charges the battery pack at the same time; when there is no illumination, the battery pack supplies power to the DC load through the solar controller, while the battery pack It is also necessary to directly supply power to the independent inverter, convert it into AC power through the independent inverter, and supply power to the AC load.

The solar power generation system is not a standardized product, but is designed and configured according to the user's usage. For example, under what circumstances would I choose a 4kw off grid solar system? So for the home solar system: what type of solar power system should I choose?

1. Then it is necessary to distinguish whether the solar system is used for lighting or for electrical appliances?

The solar power generation system can be divided into two types according to its function, one is the household DC lighting system for lighting only; the other is the 220V AC output power generation system that can be used for both lighting and household appliances. The lighting system has simple functions and is also the most cost-effective power generation system, but it cannot be used for household appliances.

2. Is it better to choose a portable all-in-one machine or a combined solar energy system?

The portable all-in-one machine is also developed and designed for portability. It is easy to carry and requires no installation. It is very suitable for outdoor camping. However, due to its limited size, the storage capacity is small. The combined type requires simple installation and large storage capacity, which is both practical and affordable, because it is also more suitable for home users and outdoor residences.

The characteristic of the battery-free DC photovoltaic power generation system is that the electrical load is a DC load, there is no requirement for the load usage time, and the load is mainly used during the day. The solar cell is directly connected to the electrical load. When there is sunlight, it generates electricity for the load to work, and when there is no sunlight, it stops working. The system does not require the use of a controller and there is no battery storage device. The advantage of the battery-free DC photovoltaic power generation system is that the loss caused by the energy passing through the controller and the storage and release of the battery is eliminated, and the solar energy utilization efficiency is improved. The most typical application of this kind of system is the solar photovoltaic water pump.

A DC photovoltaic power generation system with a battery consists of a solar cell, a solar controller, a battery, and a DC load. When sunlight enters the solar cell, the light energy is converted into electrical energy for the load to use, and the electrical energy is stored in the battery at the same time. At night or in cloudy and rainy days, the battery supplies power to the load. This system is widely used, ranging from solar lawn lights and garden lights, to mobile communication base stations, microwave transfer stations far away from the power grid, and rural power supply in remote areas. When the system capacity and load power are large, solar cell arrays and battery packs are required.

3. Is an off grid solar system or a grid-connected solar system better?

We know that there are two main types of solar power generation systems: off grid and grid-connected, and grid-connected is divided into two types with and without energy storage. The components of each type are different, the suitable places are different, and the most important thing is that the cost is very different. Generally speaking, the cost of an off grid system is much higher than that of a grid-connected system, and a grid-connected system with energy storage devices is higher than a grid-connected system without energy storage devices. off grid solar power systems are suitable for use anywhere, while grid-connected is only suitable where there is a public grid that can be integrated into.

4. Scale of solar power generation system

The scale of the solar power generation system directly determines the amount of electricity generated in a day. Usually, "W" is used to represent watts. Whether it is a grid-connected or off grid power generation system, the system capacity refers to the number of installed solar panels.