Middle of its segment, weak in heat
BYD HALO photovoltaic panels introduce a new quality to prosumer and industrial installations thanks to the use of advanced N-type TOPCon cell technology. This solution effectively eliminates the problem of light-induced degradation and the LeTID phenomenon, which directly translates into stable energy yields over decades of operation. The use of an innovative SMBB (Super Multi Busbar) structure allows for much better absorption of sunlight and minimization of internal resistance losses, which clearly distinguishes this series from market standards. The HALO series has been designed for investors looking for the perfect balance between aesthetics and extreme efficiency - elegant All Black variants perfectly blend with the modern architecture of residential roofs. Thanks to high resistance to mechanical loads and harsh weather conditions, these modules effectively solve the problem of premature component wear in the demanding Polish climate. This is a product dedicated to homeowners and companies that focus on maximum power density from a limited mounting area. Compared to the competition, BYD HALO offers exceptional technological integrity and very low temperature coefficients, which guarantees the highest productivity even on hot days. Choosing this series is a safe investment based on the proven, high-efficiency architecture of modern modules.
Ranking
Signals from the data
Residential, commercial, utility-scale and hot-climate.
Hot climates.
Bottom 18% of the HJT 600-650 W segment, against a median of -0.240.
HJT technology delivers a Pmax temperature coefficient of -0.24%/°C, compared to -0.35%/°C for standard PERC cells. In Polish climatic conditions, where modules routinely reach 60–70°C during summer, this translates to a real-world daily energy yield advantage of 3–4% over PERC installations of equivalent rated power.
The bifacial HJT construction captures 5–15% additional energy from rear-side albedo reflection, depending on surface albedo and installation tilt angle. Furthermore, N-type HJT cells are inherently immune to light-induced degradation (LID) and light and elevated temperature induced degradation (LeTID), eliminating the 1–3% power loss during the initial months of operation that is typical of PERC modules.
BYD guarantees module performance for 30 years, making this one of the longest standard warranty terms in the HJT segment. By comparison, several Tier-1 competitors in the standard TOPCon segment offer 25-year warranties with end-of-life retention as low as 84.8%. The extended warranty horizon enhances bankability and investment value for project finance structures.
The 625–645 Wp power range maximizes installed capacity on constrained rooftop or ground-mount areas, reducing module count, cabling runs, and installation labor. At 645 Wp, the BYD HALO matches the output of the most powerful variants among its direct peers, including the Canadian Solar HiHero+ Bifacial and the Runergy HY-DH156N8.
BYD (founded 1995) is listed on the Bloomberg NEF bankable Tier-1 module manufacturer index and ranks among the world's largest industrial producers. Tier-1 status is critical for securing project financing on installations above 10 kW and significantly reduces the risk of warranty default due to manufacturer insolvency.
The BYD HALO achieves a maximum efficiency of 22.79%, while direct competitors in the same power class (645 Wp) reach higher figures: Canadian Solar HiHero+ Bifacial HJT at 23.9%, and both Runergy HY-DH156N8 and Tongwei TWMND at 23.1%. This gap of 0.3–1.1 percentage points means that achieving an equivalent system rated power requires 1.5% to approximately 5% more mounting area compared to the highest-efficiency competitor in the segment.
The product warranty term of 12 years represents the lower end of the standard range for premium HJT panels. Several bifacial HJT manufacturers — including Canadian Solar — offer product warranties of 15–25 years. For commercial and industrial installations with a 25–30 year asset lifecycle, this may necessitate explicit risk provisioning for post-warranty serviceability after year 12.
- Efficiency of 22.6% matches the HJT 600-650W median
- At 226.1 W/m² power density, roof space requirements are typical for HJT 600-650W panels
- At -0.26%/°C, loses 0.02pp more power per degree than HJT 600-650W median (-0.24%/°C)
- At 35.3 kg (1.7 kg above HJT 600-650W median of 33.6 kg), requires checking roof load capacity
- 90% bifaciality enables rear-side power generation, boosting yield by 4-14% on reflective surfaces
Specifications
Datasheet charts
Measured curves published by BYD in this model's datasheet. A chart carrying a wattage was measured on that variant alone - only the ones that describe 640 Wp appear here. The rest cover the whole series.
Simulations
Degradation from this panel's own datasheet figures. No inverter, soiling or shading losses.
Model: bifaciality × albedo × 0.6 view factor. A first-order estimate, not a yield simulation.
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