The development of photovoltaic technology has exceeded expectations, and Bigger than Big is the main theme of 2020. With the development of 180 | 210 products, the "hot spot problem" caused by high current has become more prominent. The obstruction of leaves, withered grass, and even bird droppings can have an impact on power generation, and can also cause serious heat spots, ranging from affecting power generation to causing component damage and even igniting flammable materials to causing fires.

SLM6120Intelligent photovoltaic solutions

Relying on technical expertise in high voltage, high current, high conversion efficiency, and ultra-low power consumption, Shuming has independently developed intelligent optimization chips for photovoltaic modules. This solution integrates functions such as optimization, voltage limiting long strings, and no hot spots. The Shuming Intelligent Photovoltaic Optimization Scheme truly achieves the function of no temperature rise or heat spots under occlusion.

Figure 1; No temperature rise and "no hot spots" function under cover

When a single battery cell is covered, as a conventional component for comparison, the temperature at the covered area will surge from 45 ℃ to 102 ℃. At this time, if the cover is flammable materials such as leaves or withered grass, it can affect the power generation, cause component damage, and even ignite flammable materials to cause a fire. However, under the same conditions, the temperature of the obstructed battery cells in the modules using the intelligent photovoltaic scheme of Shuming only slightly increased from 45 ℃ to 48 ℃. This function can upgrade photovoltaic modules to safety components with proactive prevention functions, making them safer and more reliable.

Figure 2: Digital Intelligence | No Hot Spots and Higher Power Generation

Shuming SLM6120 realizes the "no hot spot" function

Each electronic string in the intelligent component inputs energy into the intelligent PCB board in the "most comfortable" state; The output energy is transmitted to the bus through the PCB board after current rise and voltage drop, and then connected in series to the inverter. So, only the other 23 battery cells in the blocked substring provide energy to the blocked battery cells; Instead of the approximately 1200 battery cells of all components, the energy flows through the obstructed area, causing it to heat up.

Figure 3 Schematic diagram of intelligent component without hot spot function

When the battery cells in conventional components are obstructed, approximately 1200 of the energy from all components flows through the obstructed area, causing it to heat up; Ultimately, it causes a dual pathway balance after the conduction of Bypass Diode. So when conventional components are partially obstructed, there will be high-temperature hot spots.

Figure 4 Performance of Conventional Components with Hot Spots

conclusion

The size of photovoltaic cells is getting larger, the current value is getting higher, and the problem of hot spots is becoming increasingly prominent. Shuming Intelligent Photovoltaics provides an overall solution that integrates high power generation, long string installation, and active safety prevention functions, providing technical support for larger, better, and safer photovoltaic modules.