각도에 따라 달라지는 태양광 발전량. 가성비 끝판왕은 누구?

Summary

The video compares solar installations at a factory in Busan. Filmed on December 19, near the winter solstice, it examines how panel angle, orientation, shading, and installation layout affect generation. Some capacity units in the subtitles are garbled, so those figures are approximate.

Installation comparisons

• Shaded parking-lot installation: This array uses Hyundai 640 W modules set at an angle of about 14°. A taller building blocks sunlight, especially in the morning. The presenter says roughly 36 modules—about 23 kW, according to the subtitles—receive little or no direct sun for much of the day. On favorable generation days, the installation produces about 62% of the output of the site’s best-performing array. The team plans to test module-level optimizers to reduce the effects of shading on other modules in a string, then compare generation before and after installation.

• North-facing roof at 9° versus south-facing roof at 16°: The north-side panels are kept below a 5 m installation height, resulting in a shallower angle and lower winter output—about 80% of the best-performing array at the time of filming. The presenter cautions that this is a seasonal comparison: the 9° array may perform better in summer, and its bifacial modules can also generate power from rear-side light. Its annual output could therefore approach or exceed that of the 16° south-facing array.

• North-facing and wall-side arrays: A north-facing array at about 9° produces roughly 70% of the wall-mounted array’s output in the comparison presented. The wall receives stronger direct sunlight when the sun is low, so panels near it are mounted higher than those farther north. The presenter says an annual-generation comparison would give a clearer picture of the overall difference.

• South-facing 16° array: This installation produced about 95% of the site’s top output on the day before filming. The presenter also compares it with a coastal installation in Ulsan, reporting about 4.4 versus 3.5 equivalent generation hours, respectively. The subtitles do not make the measurement basis entirely clear.

• Best-performing mixed installation: The top-performing area combines south-facing and wall-mounted arrays. The presenter reports about six equivalent generation hours on the day before filming and attributes the strong winter performance to cooling and strong sunlight. They also note that the Busan area rarely gets snow, helping avoid snow-related production losses.

Topics covered

• A site tour comparing real-world output across different panel angles and orientations
• How building shade and array layout affect generation
• A planned before-and-after test of module-level optimizers
• Seasonal and annual-output considerations, including bifacial panels

Despite the title’s reference to value for money, the video does not provide prices, installation costs, or a financial payback comparison.

Main speaker/source: The channel host, Taeyangdosa, presenting observations and generation figures from the Busan factory installation.