--- title: "Resun Solar RS8I-M-BD TOPCON 630W Solar Panel - Specs & Review | ComparePV" description: "Resun Solar RS8I-M-BD TOPCON 630W solar panel. Specs: 23.32% efficiency, Monocrystalline cells, dimensions, warranty and temperature coefficient." source: "https://comparepv.com/panel/resun-solar-rs8i-m-bd-topcon" updated: 2026-09-11 --- # Resun Solar RS8I-M-BD TOPCON Light for its output, no clear weak spot 1,086 panels in the segment TOPCon 600-650 W ## Identity - **Manufacturer:** Resun Solar - **Model:** RS8I-M-BD TOPCON - **Series:** RS8I-M-BD TOPCON - **Rated power:** 630 W - **Cell technology:** TOPCon ## How it compares Compared against segment TOPCon 600-650 W (1086 panels). | Measure | This panel | Segment median | Standing | Rank | | --- | --- | --- | --- | --- | | Power (Wp) | 630 W | 620 W | Typical | | | Module efficiency | 23.32% | 22.80% | Strong - top 15% | 973 | | Power density | 233.2 | 227.7 | Strong - top 16% | 1,003 | | Temperature coefficient | -0.290 | -0.290 | Typical | 2,165 | | Weight (kg) | 29.1 kg | 32.7 kg | Strong - top 8% | | | Performance warranty | 30 yrs | 30 yrs | Typical | 21 | ### Full peer table | Measure | This panel | Segment median | Standing | Rank | | --- | --- | --- | --- | --- | | Module efficiency | 23.32% | 22.80% | Strong - top 15% | 973 | | Power density | 233.2 | 227.7 | Strong - top 16% | 1,003 | | Temperature coefficient | -0.290 | -0.290 | Typical | 2,165 | | Weight per kWp | 46.2 | 53.1 | Strong - top 8% | 1,066 | | Performance warranty | 30 yrs | 30 yrs | Typical | 21 | ### Strengths - **46.2 kg per kWp** - Top 8% of the TOPCon 600-650 W segment, against a median of 53.1. Ranked 1,066th in the whole database. - **23.32% module efficiency** - Top 15% of the TOPCon 600-650 W segment, against a median of 22.80%. - **233.2 watts per square metre** - Top 16% of the TOPCon 600-650 W segment, against a median of 227.7. - **Best for:** Commercial and utility-scale. ## Specification ### Electrical - **Rated power (Pmax):** 630 W - **Efficiency:** 23.32 % - **Voltage at Pmax (Vmp):** 41.56 V - **Current at Pmax (Imp):** 15.16 A - **Open-circuit voltage (Voc):** 49.50 V - **Short-circuit current (Isc):** 16.03 A - **Max system voltage:** 1500 V ### Temperature - **Temperature coefficient of Pmax:** -0.290 %/degC - **Temperature coefficient of Voc:** -0.250 %/degC - **Temperature coefficient of Isc:** 0.040 %/degC - **NOCT:** 45 degC ### Cell and construction - **Cell type:** Monocrystalline - **Cell technology:** TOPCon - **Cell count:** 132 ### Physical - **Length:** 2382 mm - **Width:** 1134 mm - **Thickness:** 30 mm - **Weight:** 29.1 kg - **Area:** 2.70 m2 - **Power density:** 233.2 Wp/m2 ### Warranty and degradation - **Product warranty:** 15 years - **Performance warranty:** 30 years - **Annual degradation:** 0.50 % - **Output after 30 years:** 532 W ## Rank in the whole catalogue | Measure | Position | | --- | --- | | Efficiency | 973 of 14005 | | Power density | 1003 of 14005 | | Temperature coefficient | 2165 of 14005 | | Weight | 1066 of 14005 | | Warranty | 21 of 14005 | ## About this series The RS8I-M-BD TOPCon series consists of solar modules built on monocrystalline **half-cut** TOPCon cells, featuring multi-busbar SMBB technology that reduces internal power loss and boosts conversion efficiency. Splitting the cells in half significantly lowers the risk of hot-spot effects caused by partial shading, making the series a solid choice both for rooftops with uneven sun exposure and for utility-scale installations. The modules stand out for their **high resistance to PID degradation**, keeping energy yield stable throughout the system's lifetime and helping to keep LCOE low. Tempered glass with enhanced light transmittance ensures strong performance even in low-light conditions, such as early morning or overcast days. The mechanical design is built for extreme weather - the series offers **high mechanical strength** against wind and snow loads and is certified for resistance to salt mist and ammonia, which matters for coastal and agricultural installations. The manufacturer guarantees **low annual power degradation** of just 0.5% over 30 years, backed by a 15-year product warranty and a 30-year linear power warranty, making the RS8I-M-BD TOPCon a reliable long-term investment for installers and asset owners seeking predictable returns. ## Notable figures - 23.3% module efficiency - 0.5pp better than the \*\*TOPCon 600-650W\*\* median of 22.8% - 233.2 W/m² power density - 5.5 W/m² more than \*\*TOPCon 600-650W\*\* median (227.7 W/m²), more power per roof area - At -0.29%/°C, hot weather performance is typical for \*\*TOPCon 600-650W\*\* panels - At 29.1 kg, this panel is 3.6 kg lighter than \*\*TOPCon 600-650W\*\* median (32.7 kg) - easier handling during installation - In the top 7% for efficiency among all TOPCon panels ## Questions ### What is the maximum power output of the RS8I-M-BD TOPCon module and who is it suited for? Modules in the RS8I-M-BD TOPCon series reach up to 630 Wp. This high per-panel output reduces the number of modules needed to reach a given system capacity, making the series well suited for large-scale solar farms as well as industrial and agricultural rooftops where maximizing available surface area is a priority. ### How does the TOPCon technology in the RS8I-M-BD differ from standard PERC panels? TOPCon is a newer cell technology that uses an additional passivation layer to reduce carrier recombination, resulting in higher conversion efficiency than conventional PERC cells. Combined with half-cut cell design and multi-busbar SMBB technology, the module produces more energy from the same surface area and handles partial shading better. ### What warranty comes with RS8I-M-BD TOPCon panels and what does it cover? Resun Solar provides a 15-year product warranty and a 30-year linear power warranty. This means protection against material and workmanship defects for 15 years, while power output degradation is guaranteed to stay within the declared curve for 30 years, supporting predictable long-term returns on investment. ### Are RS8I-M-BD TOPCon panels suitable for coastal or agricultural installations? Yes, the series is certified resistant to salt mist and ammonia corrosion, making it well suited for coastal installations where panels are exposed to salty air, as well as for agricultural sites where elevated ammonia levels from livestock farming can be present in the air. ### What is the annual power degradation rate of RS8I-M-BD TOPCon modules? The manufacturer declares a very low annual power degradation rate of around 0.5% over a 30-year span. This means the panel should retain a significant share of its original output after three decades of operation, which matters when estimating long-term energy yield and system profitability. ### Do RS8I-M-BD TOPCon modules perform well in low-light conditions, such as early morning? Yes, the tempered glass with enhanced light transmittance improves solar radiation absorption even at low sun angles or under cloud cover. As a result, the panels generate energy more efficiently in early morning, late afternoon, and overcast conditions compared to standard modules without this feature. ## Datasheet [Manufacturer datasheet (PDF)](https://comparepv.com/datasheets/RS8I-M-BD-595-630W-TOPCON-2f9cff044786.pdf) ## Alternatives | Panel | Power | How it differs | | --- | --- | --- | | [AIKO AIKO-A650-MAE72Mw](https://comparepv.com/panel/aiko-aiko-a650-mae72mw) | 650 W | Cooler, lighter, +1.9 pp | | [AIKO AIKO-A680-MDE72Mw](https://comparepv.com/panel/aiko-aiko-a680-mde72mw) | 680 W | +50 W, cooler, +1.9 pp | | [AIKO AIKO-A675-MDE72Mw](https://comparepv.com/panel/aiko-aiko-a675-mde72mw) | 675 W | +45 W, cooler, +1.7 pp | | [AIKO AIKO-A645-MAE72Mw](https://comparepv.com/panel/aiko-aiko-a645-mae72mw) | 645 W | Cooler, lighter, +1.7 pp | | [AIKO AIKO-G670-MCH72Mw](https://comparepv.com/panel/aiko-aiko-g670-mch72mw) | 670 W | +40 W, cooler, +1.5 pp | | [Longi Solar LR7-72HVHF-670M](https://comparepv.com/panel/longi-lr7-72hvhf-670m) | 670 W | +40 W, cooler, +1.5 pp | | [AIKO AIKO-A640-MAE72Mw](https://comparepv.com/panel/aiko-aiko-a640-mae72mw) | 640 W | Cooler, lighter, +1.5 pp | | [Resun Solar RS8H-M-BD-595W](https://comparepv.com/panel/resun-solar-rs8h-m-bd-595w) | 595 W | -35 W, -1.3 pp | | [Resun Solar RS8H-M-BD-600W](https://comparepv.com/panel/resun-solar-rs8h-m-bd-600w) | 600 W | -30 W, -1.1 pp | | [Resun Solar RS8H-M-BD-605W](https://comparepv.com/panel/resun-solar-rs8h-m-bd-605w) | 605 W | -25 W, -0.9 pp | | [Resun Solar RS8H-M-BD-610W](https://comparepv.com/panel/resun-solar-rs8h-m-bd-610w) | 610 W | -20 W, -0.7 pp | | [AIKO AIKO-A700-MAE78Dw](https://comparepv.com/panel/aiko-aiko-a700-mae78dw) | 700 W | +70 W, heavier, +1.7 pp | | [AIKO AIKO-A695-MAE78Dw](https://comparepv.com/panel/aiko-aiko-a695-mae78dw) | 695 W | +65 W, heavier, +1.6 pp | | [Jinko Solar JKM650-670N-66QL6-BDV (670W class)](https://comparepv.com/panel/jinko-solar-jkm650-670n-66ql6-bdv-670w-class) | 670 W | +40 W, heavier, +1.5 pp | --- Source: https://comparepv.com/panel/resun-solar-rs8i-m-bd-topcon Not in this file, on the page: the I-V and temperature curves lifted from the manufacturer's datasheet, a thirty-year output simulator and alternatives filtered by how closely they match these dimensions.