Middle of its segment, heavy for its output
The HELOC Plus G12 series from Goldi Solar is built on heterojunction (HJT) technology with bifacial half-cut cells and a 12-busbar current-collecting grid, delivering high conversion efficiency and stable performance under demanding operating conditions. By harvesting energy from the rear side of the module, these panels generate an additional energy yield even from diffuse light reflected off the ground, making them especially attractive for ground-mount installations, agrivoltaic projects, and flat roofs where maximizing the use of available surface area matters most. The advanced N-type silicon structure combined with a textured glass coating ensures excellent low-light performance, so the modules maintain high productivity in the early morning, evening hours, and on overcast days. The series also stands out for its strong resistance to potential-induced degradation (PID) and a certified IP68 junction box enclosure, which minimizes the risk of failure in humid and variable climates. A low annual degradation rate paired with a robust mechanical design helps lower LCOE and shorten payback periods. This is a solution designed for commercial, industrial, and agricultural investors who expect long-term reliability and maximum energy output from every square meter of installed capacity.
Ranking
Signals from the data
Utility-scale, commercial, agrivoltaic and shaded-installations.
Weight-limited structures, tight roof space and roofs where every square metre has to count.
Bottom 11% of the HJT 650-700 W segment, against a median of 55.7.
Bottom 17% of the HJT 650-700 W segment, against a median of 22.20%.
Bottom 25% of the HJT 650-700 W segment, against a median of 222.1.
N-type half-cut heterojunction cells with 12 busbars deliver efficiency up to 22.85%, while bifacial energy generation captures reflected light for additional yield - particularly valuable in ground-mount and flat-roof installations.
The linear power warranty covers 30 years, matching the standard set by leading Tier-1 peers (Heliene, Talesun, Tongwei) and supporting lower LCOE and greater ROI certainty over the long term.
Goldi Solar is listed as a Tier-1 bankable manufacturer by Bloomberg New Energy Finance, easing access to non-recourse project financing for commercial and industrial installations using this series.
Strong resistance to potential-induced degradation (PID) combined with certified IP68 junction box sealing minimizes failure risk in humid, variable climates, reducing lifecycle service costs.
N-type silicon structure and textured glass coating maintain high productivity in morning, evening, and overcast conditions, boosting real-world annual yield compared to older-generation PERC panels.
Peak efficiency of 22.85% is marginally lower than comparable HJT/TOPCon competitors - Heliene 132HC G12 HJT (22.86%), Talesun TM8G66M (22.9%), and Tongwei TNC (22.9%). The gap is minor but could matter for space-constrained roof projects.
The 12-year materials and workmanship warranty is standard, but some HJT manufacturers now offer 15-25 year product warranties, which may be a key differentiator when comparing offers for long-horizon commercial projects.
- Efficiency of 21.9% matches the HJT 650-700W median
- At 218.9 W/m², this panel generates 3.2 W/m² less per unit area than HJT 650-700W median (222.1 W/m²)
- Temperature coefficient of -0.26%/°C matches the HJT 650-700W median
- Bifaciality factor of 80% can add 4-12% extra yield with reflective mounting surface
- Ranked #6946 out of 14129 panels for efficiency in the database
Specifications
Datasheet charts
Measured curves published by Goldi Solar in this model's datasheet. A chart carrying a wattage was measured on that variant alone - only the ones that describe 680 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.
Alternatives
Found 1393 panels of the same or similar size to this one, within ±10 mm. See them here Found 1403 panels of the same or similar size to this one, within ±25 mm. See them here Found 1403 panels of the same or similar size to this one, within ±50 mm. See them here Found 1435 panels of the same or similar size to this one, within ±100 mm. See them here
About the HELOC PLUS G12 Series series
These answers cover the whole series. Where a figure differs, the specification above is this module's own.