Back contact technology demonstrates higher energy yield than TOPCon technology in humid coastal climates

Real-world performance data from an offshore empirical project in Yantai, Shandong Province, confirms that HPBC 2.0 back contact technology delivers a higher energy yield than TOPCon technology in humid coastal environments. A direct energy yield comparison under identical field conditions validated that LONGi HPBC 2.0 modules generated 2.43% more electricity per kilowatt-peak than Company A TOPCon modules over a three-month test period. This measured field data provides clear evidence that back contact technology optimizes light absorption and maintains superior conversion efficiency in maritime climates characterized by heavy overcast weather and high humidity.

The Yantai offshore empirical project confirms strong performance under frequent overcast conditions

The empirical test plant is located in Yantai City, Shandong Province, at coordinates 121°63'E, 37°47'N. This coastal site sits within a warm temperate zone that experiences four distinct seasons. Maritime environmental conditions heavily influence the project area, bringing hot, rainy summers along with cold winters with low precipitation. During the spring and autumn seasons, the installation faces frequent, continuous overcast periods and persistent rainy weather, creating a demanding operating environment for solar PV installations.

Standardized empirical setups ensure an accurate side by side field comparison

To ensure a precise energy yield comparison, the unshaded empirical site utilizes a standardized side-by-side technical setup to monitor real-world performance.

• The field evaluation compared LONGi modules directly against Company A modules.

• The evaluation contrasted HPBC 2.0 back contact technology with standard TOPCon technology.

• The rated power of the LONGi HPBC 2.0 modules stood at 635W while the Company A TOPCon modules were rated at 615W.

• Both module types featured an identical area per module of 2.701 square meters to maintain standard sizing.

• Each independent array contained exactly 18 modules to ensure equal exposure to coastal weather elements.

Field measurements record a 2.43% average energy yield gain for HPBC 2.0 over TOPCon modules

The real-world performance tracking ran from January 4, 2025, to March 30, 2025. Daily power generation data per watt was recorded and analyzed to calculate the total cumulative specific yield.

• The HPBC 2.0 modules achieved a cumulative specific yield of 40.74 kWh/kWp.

• The TOPCon modules achieved a cumulative specific yield of 39.78 kWh/kWp.

• The overall results show a 2.43% average power generation gain for the HPBC 2.0 modules over the TOPCon technology.

• During the testing cycle, the HPBC 2.0 setup reached a peak single-day energy yield gain of 6.77% over the TOPCon modules.

Higher power generation directly increases project return on investment by maximizing power density

When evaluating high-efficiency solar modules for large-scale maritime or coastal deployments, a 2.43% generation advantage significantly alters the financial profile of the asset. Higher specific yield means that the system produces more kilowatt-hours from the exact same physical footprint and structural racking. Over a standard operational lifetime, this continuous extra power generation lowers the levelized cost of electricity and accelerates the return on investment for asset owners without increasing installation complexity.

Maritime installations require module architectures that excel under diffuse light exposure

Offshore and coastal solar installations represent an expanding segment for high-efficiency solar modules, but they face unique atmospheric challenges. Salt operational environments, high humidity, and frequent morning or evening mist reduce direct sunlight availability. The measured field data from Yantai demonstrates that HPBC 2.0 back contact technology maintains superior low-irradiance performance and handles diffuse light conditions better than standard TOPCon modules, making it highly suited for humid coastal climates.

Rear contact placement eliminates front surface shading to optimize light absorption

The performance gap between back contact technology and TOPCon technology stems from architectural design differences. HPBC 2.0 modules place all electrical contacts on the rear side of the solar cell. This engineering choice removes front-side metal grid lines, completely eliminating shading losses on the front surface and maximizing the active light-receiving area. In coastal regions with frequent overcast weather, this increased aperture efficiency allows the cell to capture more ambient, scattered light, resulting in the recorded 2.43% average yield gain.

Frequently asked questions

Which solar technology performs better in humid climates?

Measured field data from coastal empirical testing indicates that HPBC 2.0 back contact technology generates more power than TOPCon technology in humid climates. In environments with frequent overcast days, the front-contact-free design captures diffuse light more effectively.

How much more electricity can BC modules generate?

In this unshaded coastal test case, HPBC 2.0 modules delivered a 2.43% average power generation gain per kilowatt over TOPCon modules, with peak single-day yield advantages reaching up to 6.77%.

Does back contact technology outperform TOPCon across different climates?

Across multiple climate zones and installation scenarios, real-world field data shows consistent energy yield advantages for HPBC 2.0 back contact technology compared with TOPCon modules.