Demin Power
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Compared with the traditional off grid inverter system, the biggest difference between the new off grid inverter system and the traditional off grid inverter system is that there is no need for batteries or a small amount of batteries, so as to reduce the initial investment cost, make full use of new energy to generate electricity, and achieve the purpose of reducing the use of grid electricity or diesel generator. The new off grid inverter system consists of solar panels, combiner box, new off grid inverter and other components.
The electric energy generated by solar panels is directly connected to the new-type off grid inverter after converging through the combiner box, and then DC is converted to AC through the new-type off grid inverter for the use of load equipment.
The diesel engine / power grid is connected through the AC input terminal of the new off grid inverter, and it will participate in the inverter after rectification. When the power supply of solar panel is insufficient, it will automatically switch and supplement, and the switching time is 0ms.
In the system with a small number of batteries, some solar panels are connected to the controller to charge the batteries. The battery plays a supporting role in the switching process between solar panels and diesel generator, so as to avoid power failure of the system during the switching process.
In some application, the new off grid inverter can also be used in wind power, hydropower and other systems.
| Type | SPI 220-75K | SPI 380-75K | SPI 440-75K |
|---|---|---|---|
| Solar Input | |||
| Solar power | 75KWp | 75KWp | 75KWp |
| Solar panels voltage (Vmp) | 450V | 525V | 525V |
| Battery (optional) | |||
| Battery rated voltage (DC) | 360V | 420V | 420V |
| Input voltage range (DC) | 300-450V | 350-525V | 350-525V |
| Three-phase AC input | |||
| Allow voltage range (AC) | 220V ± 15% | 380V ± 15% | 440V ± 15% |
| Input rated current | 219A | 127A | 109A |
| Transfer time | 0ms | ||
| AC bypass (optional) | |||
| Allow AC input voltage range | 220V ± 15% | 380V ± 15% | 440V ± 15% |
| Input frequency accuracy | 50Hz/60Hz ± 10% | ||
| Bypass transfer time | ≤100ms (≤10ms optional) | ||
| Three-phase AC output | |||
| Rated power | 75KW | ||
| AC Rated voltage | 220V | 380V | 440V |
| Rated phase current | 220V 197A | 114A | 98A |
| Output voltage accuracy | 220V ± 1% | 380V ± 1% | 440V ± 1% |
| Output frequency accuracy | 50Hz/60Hz ± 0.05% | ||
| Waveform distortion (THD) | ≤3% (Linear load) | ||
| Overload capacity | 110% for 10 minutes, 200% for 10 seconds | ||
| Crest factor (CF) | 3:1 | ||
| Inverter efficiency | >90% | ||
| Working Environment & Physical Specifications | |||
| Dielectric strength | 1500VAC, 1 minute | ||
| Noise (1m) | <50dB | ||
| Ambient temperature | -10℃ ~ +50℃ | ||
| Humidity | 0~90%, No condensation | ||
| Altitude | <2000m (rated power reduces above 2000m) | ||
| Protection Functions | Input reverse protection, input under-voltage protection, output overload protection, output short circuit protection, thermal protection | ||
| Size | 1000mm * 1000mm * 1700mm | ||
| Weight | 600KG | ||
The company was established in 2004 and acquired two registered trademarks in the same year. After five years of accumulation in 2009, the company gradually matured steadily. The company purchased factory buildings with independent property rights, and relocated to start a new journey. In 2012, the Ministry of Foreign Trade was established to open up markets and begin to expand foreign markets. In 2015, the company achieved rapid development, obtaining 2 invention patents, 6 utility model patents, and 1 appearance patent. It was recognized as a "high-tech enterprise" and obtained the ISO 9001 quality management system certification. In 2018, the company continued to innovate with four invention patents, six utility model patents, and two software registration rights, successfully maintaining its high-tech enterprise recognition. On July 10, 2019, it passed the certification of the intellectual property management system. In 2020, three patents for invention and six patents for utility models were applied for.
1. Our main products are off-grid wind turbine controllers, on-grid wind turbine controllers, solar charging controllers, wind-light complementary controllers, wind-light complementary street lamp controllers, on-grid inverters, off-grid inverters, frequency converters, stabilized frequency power supplies, etc.
2. With first-class manufacturing technology, advanced technology and equipment, strong technical force, perfect testing means, and personnel management, we have carried out 17 research and development projects in the last three years, completed 16 transformations of scientific and technological achievements, and invested independently to implement these transformations, averaging 5.3 scientific and technological transformations each year.
3. We take technological innovation as the basis of enterprise development, with annual R&D costs not less than 20% of sales revenue. We continuously explore advanced technologies in the field of new energy power sources, such as electromagnetic control technology for wind turbines, MPPT technology, yaw wind turbines control technology, and wind-solar complementary system Internet of Things monitoring. We hold five national invention patents for core technologies and twelve utility model patents.
4. We have a complete product quality assurance system and ISO 9001 certification. We perform comprehensive quality control, rigorous testing, and ensure all products have passed the EU CE certification, ensuring user safety and reliable use. Our products are exported to more than 120 countries and regions, including Germany, Japan, the United States, the United Kingdom, Canada, Australia, Egypt, Brazil, and Saudi Arabia.
5. We are market-based and customer-focused, providing high-quality products while adhering to technological progress, scientific management, and standardized operations. We aim to construct the blueprint of a modern enterprise in an all-round and three-dimensional way.
