1. Application Scenario
In the process of outdoor construction, electric tools which mainly include self-contained power supply (battery module) and external power supply are often used. Electric tools with their own power supply can only work on batteries for a period of time, and they still rely on external power supply for long-term use; Electric tools that rely on external power supply also need power supply to work normally.
At present, diesel generators are generally used to supply power to electric equipment for outdoor construction. There are two main reasons. The optical storage AC off grid power supply system may be a better choice. First of all, it is very difficult to refuel the diesel generator set. Either the gas station is very far away or the gas station needs to provide identity certificates, which makes refueling very troublesome; Secondly, the quality of electricity generated by diesel generators is very poor, resulting in many electric tools burning out in a short time. Then, the optical storage AC off grid power supply system does not need to find a gas station. As long as the weather is normal, it will continue to generate power, and the quality of the generated power is also stable, which can completely replace the municipal power.
2. System Design
The PV storage and power supply system adopts the integrated DC bus technology, organically combines the photovoltaic power generation system, battery energy storage subsystem, DC distribution system and other subordinate systems, and makes full use of the clean, green energy generated by solar energy to stably supply power to household appliances. The system provides AC 220V and DC 24V power supplies. The system uses the battery energy storage subsystem to buffer the power consumption and quickly adjust the power balance; The whole power supply system provides safe, reliable and stable power supply capacity for families and houses to meet the power supply needs of various household appliances and lighting.
Key points for design:
(1) Removable
(2) Light weight and easy assembly
(3) High power
(4) Long service life and maintenance free
3. System Composition
(1) Power generation unit:
Product 1: photovoltaic module (Single Crystal & polycrystalline) type: solar power generation;
Product 2: fixed support (hot galvanized steel structure) type: fixed structure of solar panel;
Accessories: special photovoltaic cables and connectors, as well as subordinate accessories of solar panel fixing bracket;
Remarks: according to the site requirements of different monitoring systems, three types (solar panel fixed structure) such as column, scaffold and roof are provided for users to choose;
(2) Power storage unit:
Product 1: lead acid battery pack type: power storage device;
Accessory 1: battery connecting wire, used for connecting wires between lead-acid batteries and outgoing cable bus of battery pack;
Accessory 2: battery box (placed in the power cabin), which is a special protective box for the battery pack buried underground of outdoors, and with the functions of salt fog proof, moisture-proof, waterproof, rat proof, etc;
(3) Power distribution unit:
Product 1. PV storage DC controller Type: charge discharge control and energy management strategy control
Product 2. PV storage off grid inverter Type: invert (transform) DC power supply into AC power supply to supply power to household appliances
Product 3. DC distribution box Type: DC distribution products that provide lightning protection for solar energy, storage battery and electrical equipment
Product 4. AC distribution box Type: protection of overcurrent and overload of household appliances, distribution of AC power supply and detection of mains power access
Product 5. Energy digital gateway (optional) Type: energy monitoring
Accessories: DC distribution connecting line (photovoltaic, storage battery, DC distribution, surge lightning protection), and accessories for equipment fixation
Remark:
The power storage unit and power distribution unit can be directly integrated into a box according to the needs of users. Under this condition, the battery is placed inside the box.
4. Typical Case
Location: China Qinghai
System: solar AC off grid power supply system
Description:
As the project site is nearly 400km away from the nearest gas station, the power demand for outdoor construction is very high. After several talks with customers, it is determined to use the PV storage AC off grid power supply system to supply power for the outdoor construction site. The main power loads include the power tools on the site and the kitchen and living appliances of the construction personnel.
The photovoltaic power generation unit is built in the open space not far from the project site, and the re-installable mechanical structure is adopted to facilitate re-installation and fixation. The PV storage all-in-one machine also has the characteristics of portable installation and reuse. As long as it is installed in sequence according to the installation manual, the equipment assembly can be completed. Convenient and reliable!
Construction notes: the installation of photovoltaic modules needs to ensure the fixation of the array and ensure that the photovoltaic array won’t be destroyed by strong wind in windy weather.
5.Market potential
The PV storage AC off grid power supply system takes solar energy as the main power generation unit and battery energy storage as the power storage unit to make full use of solar power generation to supply power for electrical equipment and kitchen electrical equipment on the construction site. In cloudy afternoon or night when the sun is bad or there is no sunshine, the power supply of diesel generator can be directly connected to supply power to key electrical equipment.
The steady progress of outdoor construction must be supported by sufficient and reliable power. Compared with the traditional diesel generator set, the PV storage AC off grid power supply system has the advantages of one-time installation, can continue to support until the end of the project, and does not need to go out to buy oil for many times; At the same time, the power quality of the power provided by this power supply system is also very high-quality, which can effectively protect the safety and prolong the service life of the electrical equipment on the construction site.
The PV storage AC off grid power supply system can provide continuous and stable high-quality power supply for outdoor construction and effectively ensure the high-speed promotion of construction progress. The system itself is a power supply system that can be installed and used for many times to make full use of solar power generation. Since the cost of solar power generation is very affordable, it must be a good choice to install a set of PV storage AC off grid power supply system on the outdoor construction site.