Home off-grid photovoltaic power generation system solutions, mainly to solve the lack of electricity or unstable public power supply of home users in the power problem.

The off-grid photovoltaic power generation system is composed of photovoltaic modules, off-grid inverters, solar controllers, energy storage batteries, cables, brackets, etc. Among them, the off-grid inverter and solar controller in the small off-grid system below 5 kW can be combined into a reverse control integrated machine.

At present, JDSOLAR family off grid photovoltaic power generation system equipment is mainly sold to remote areas in North America, Africa, Southeast Asia, and Chinese Mainland, such as pastoral areas in Tibet, Xinjiang, Gansu, and Inner Mongolia. Conventional systems range from 1 kW to 20 kW. The energy storage systems we configure in relatively affluent areas are all lithium iron phosphate batteries, and only a few underdeveloped areas are equipped with lead-acid batteries.

The home off grid photovoltaic power generation system, also known as an independent photovoltaic power generation system, has independent power generation equipment as the core, and can provide electricity to users through self-sufficiency of power generation equipment without relying on traditional power supply networks. The system can be connected to wind power generation or diesel engine power generation. Users can obtain stable and reliable power supply anytime and anywhere through their home off grid photovoltaic power generation system.

As renewable energy generation equipment, both photovoltaic and wind power generation have environmentally friendly characteristics such as pollution-free and low noise, which meet the requirements of sustainable development. The home off grid photovoltaic power generation system can also reduce the load pressure on traditional power grids, reduce the demand for transmission lines and substations, save resources, and improve the safety of the power grid. It can avoid faults and power outages in traditional power grids and ensure stable and reliable power supply.

The working principle of the home off grid photovoltaic power generation system: The photovoltaic panel converts solar energy into electrical energy under light conditions, and supplies power to the load through the solar control inverter integrated machine, while charging the battery pack; When there is no light, the battery supplies power to the AC load through the inverter. The home off grid photovoltaic power generation system does not rely on the power grid, and its working mode is "storing while using" or "storing before using".

JDSOLAR Home Off grid Photovoltaic Power Generation System Solution:

1. According to the charging method, there are two types of solar controllers: PWM and MPPT. The controller adopts PWM mode, with only one switch between the component and the battery. By controlling the duty cycle of the switch, the battery is charged. PWM mode technology is mature, the circuit is simple and reliable, and the price is cheap. However, the utilization rate of the component is low, and the current utilization efficiency of the component is about 70%. The voltage of the component is between 1.2 and 2.0 times that of the battery. If it is a 24V battery, the input voltage of the component is between 30-50V; MPPT solar controller refers to a solar controller with maximum power point tracking function. There is a BUCK voltage reduction circuit between the component and the battery. The MPPT solar controller can detect the voltage and current of the solar panel in real-time, and continuously track the maximum power, so that the system always charges the battery at maximum power. The utilization rate of the component is about 90% or more. The voltage of the component is between 1.2 and 3.5 times that of the battery. If it is a 24V battery, the input voltage of the component is between 30-90V.

2. Inverter configuration, the waveform of the inverter is mainly divided into two categories, one is a sine wave inverter, and the other is a modified wave inverter. Correction sine wave inverter uses PWM pulse width modulation to generate correction wave output. Due to the presence of about 20% harmonic distortion, it cannot carry inductive loads such as air conditioning, but can carry resistive loads such as electric lights. The modified sine wave inverter adopts a non isolated coupling circuit, with simple components and high efficiency. The pure sine wave inverter adopts an isolated coupling circuit design, which is complex and costly. It can connect to any common electrical equipment (including televisions, LCD displays, etc., especially inductive loads such as refrigerators) without interference.

Suggestions for selecting configurations for various application scenarios of JDSOLAR home off grid photovoltaic power generation system:

1. In poverty-stricken areas without electricity, such as remote mountainous areas and some impoverished countries in Africa, the main solution is to meet the demand for lighting. Users are very sensitive to prices, so it is recommended to use PWM controllers, correction wave inverters, and integrate the controller, inverter, and battery. This method has a simple structure, high efficiency, convenient user wiring, and a very cheap price. It also has no problem driving light bulbs, small televisions, and small fans.

2. In relatively affluent areas with power shortages, such as Inner Mongolia, Xinjiang, Tibet, and some herdsmen and island residents of Hainan Island, if the user's load power is relatively high but the power consumption time is not very long, such as a 3kW user who consumes about 10 kWh of electricity per day and the local average sunshine time is 4 hours, it is recommended to choose an inverter control integrated machine with pure sine wave output, such as the Jiaotong University Optics Valley Off grid Inverter JDF5000, which is equipped with 3.5kW components and can be equipped with a refrigerator, Air conditioning and other loads. If the user's load power is relatively small but the power consumption time is long, such as a 2kW user who consumes more than 20 kWh of electricity per day and has an average local sunshine time of 4 hours, it is recommended to choose a separate controller and inverter, with a component of 6kW, two 48V80A controllers, and 3kVA inverters.

3. In areas with frequent power outages or significant peak valley price differences, where photovoltaic power cannot be connected to the grid, such as Mindanao Island in the Philippines, a Southeast Asian country. For systems with power levels above 10kW but below 200KW, it is recommended to choose a photovoltaic and off grid energy storage system, which has a simple and convenient structure. In areas without power grids, diesel generator sets and photovoltaic systems form a hybrid power supply system, which has lower maintenance costs, no noise, and lower power generation costs compared to diesel generator sets operating separately. Compared with pure off grid photovoltaic, it can save a lot of expensive batteries and lower the overall power generation cost.