--- title: "Renesola RS7-620NBG-E2 620W Solar Panel - Specs & Review | ComparePV" description: "Renesola RS7-620NBG-E2 620W solar panel. Specs: 22.18% efficiency, Monocrystalline cells, dimensions, warranty and temperature coefficient." source: "https://comparepv.com/panel/renesola-rs7-620nbg-e2" updated: 2026-09-11 --- # Renesola RS7-620NBG-E2 Middle of its segment, heavy for its output 359 panels in the segment N-type 600-650 W ## Identity - **Manufacturer:** Renesola - **Model:** RS7-620NBG-E2 - **Series:** RS7-615~635NBG-E2 - **Rated power:** 620 W - **Cell technology:** N-type - **Bifacial:** yes ## How it compares Compared against segment N-type 600-650 W (359 panels). | Measure | This panel | Segment median | Standing | Rank | | --- | --- | --- | --- | --- | | Power (Wp) | 620 W | 625 W | Typical | | | Module efficiency | 22.18% | 22.77% | Weak - bottom 12% | 5,930 | | Power density | 221.8 | 227.7 | Weak - bottom 13% | 5,869 | | Temperature coefficient | -0.290 | -0.290 | Typical | 2,165 | | Weight (kg) | 35.0 kg | 32.5 kg | Weak - bottom 8% | | | Performance warranty | 30 yrs | 30 yrs | Typical | 21 | ### Full peer table | Measure | This panel | Segment median | Standing | Rank | | --- | --- | --- | --- | --- | | Module efficiency | 22.18% | 22.77% | Weak - bottom 12% | 5,930 | | Power density | 221.8 | 227.7 | Weak - bottom 13% | 5,869 | | Temperature coefficient | -0.290 | -0.290 | Typical | 2,165 | | Weight per kWp | 56.5 | 52.7 | Weak - bottom 8% | 10,653 | | Performance warranty | 30 yrs | 30 yrs | Typical | 21 | ### Watch out for - **56.5 kg per kWp** - Bottom 8% of the N-type 600-650 W segment, against a median of 52.7. Ranked 10,653rd in the whole database. - **22.18% module efficiency** - Bottom 12% of the N-type 600-650 W segment, against a median of 22.77%. - **221.8 watts per square metre** - Bottom 13% of the N-type 600-650 W segment, against a median of 227.7. - **Best for:** Utility-scale and commercial. - **Not ideal for:** Weight-limited structures, tight roof space and roofs where every square metre has to count. ## Specification ### Electrical - **Rated power (Pmax):** 620 W - **Efficiency:** 22.18 % - **Voltage at Pmax (Vmp):** 47.37 V - **Current at Pmax (Imp):** 13.09 A - **Open-circuit voltage (Voc):** 57.37 V - **Short-circuit current (Isc):** 13.74 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:** 0.045 %/degC - **NOCT:** 43 degC ### Cell and construction - **Cell type:** Monocrystalline - **Cell technology:** N-type - **Cell count:** 156 - **Bifacial:** yes - **Bifacial gain:** 10.00 ### Physical - **Length:** 2465 mm - **Width:** 1134 mm - **Thickness:** 30 mm - **Weight:** 35.0 kg - **Area:** 2.80 m2 - **Power density:** 221.8 Wp/m2 ### Warranty and degradation - **Product warranty:** 15 years - **Performance warranty:** 30 years - **Output guaranteed at end of warranty:** 87.4 % - **First-year degradation:** 1.00 % - **Annual degradation:** 0.40 % - **Output after 30 years:** 542 W ## Rank in the whole catalogue | Measure | Position | | --- | --- | | Efficiency | 5930 of 14005 | | Power density | 5869 of 14005 | | Temperature coefficient | 2165 of 14005 | | Weight | 10653 of 14005 | | Warranty | 21 of 14005 | ## Pros - **N-type TOPCon cell technology** - N-type TOPCon cells deliver a low power temperature coefficient of -0.29%/°C, outperforming typical PERC modules (usually -0.35 to -0.40%/°C), which translates into higher real-world yield in hot climates and on poorly ventilated roofs. - **Bifacial dual-glass construction** - Dual-glass build with bifacial cells captures light reflected off the ground, typically adding several to low double-digit percent energy gain in ground-mount PV farms and on bright flat roofs, while the stiffer structure improves mechanical durability versus standard glass-backsheet modules. - **30-year power warranty at 87.4%** - The manufacturer guarantees 87.4% of nominal power retained after 30 years, matching leading N-type series on the market (e.g., Longi Hi-MO X10) and clearly exceeding the 25-year warranty standard of older PERC series. - **Tier-1, bankable manufacturer since 2005** - Renesola is a Tier-1 bankable manufacturer with a 20-year track record (founded 2005), which eases project financing with banks and provides assurance of long-term warranty support availability. - **High unit power output 615-635 Wp** - The 2465x1134 mm format with 156 cells reaches up to 635 Wp per module, reducing module count, DC cabling runs, and mounting structure costs per installed MW in large ground-mount installations. ## Cons - **Efficiency trails segment leaders** - Peak efficiency of 22.72% matches Talesun's TM7G78M but clearly lags behind competing N-type series at the same 635 Wp power class - Sunpro Power TOPCon 210R (23.51%) and Longi Hi-MO X10 (23.5%), a gap of roughly 0.8 percentage points. - **Large format and heavy module weight** - Dimensions of 2465x1134x30 mm and a 35 kg weight require at least two installers for handling and a correspondingly reinforced mounting structure, which may increase logistics and labor costs compared to smaller module formats. ## About this series The Renesola RS7-615~635NBG-E2 series consists of modules designed to achieve high energy production from the same surface area - particularly in locations where maximum power density and stable operation under varying conditions are crucial. The use of **N-type TOPCon** technology helps to minimize losses due to degradation over time and maintain predictable energy yields throughout the installation's lifespan. The **bifacial** design, combined with **double glass**, allows for effective utilization of light reflected from the ground, which translates into additional energy gains in PV farms, ground-mounted installations, and flat-roof systems with a light membrane or gravel. These modules also stand out for their **mechanical and environmental durability**, thanks to the robust dual-glass construction, which simplifies the design of installations in demanding locations. This is a sound choice for investors who want to combine high performance with long-term reliability and easier energy cost balancing over time. ## Notable figures - Efficiency of 22.2% is 0.6pp below the \*\*N-type 600-650W\*\* median (22.8%) - 221.8 W/m² power density is 5.9 W/m² below \*\*N-type 600-650W\*\* median (227.7 W/m²) - requires larger installation area - At -0.29%/°C, hot weather performance is typical for \*\*N-type 600-650W\*\* panels - Weight of 35.0 kg is 2.5 kg above \*\*N-type 600-650W\*\* median (32.5 kg) - verify structural support - #5930 for efficiency, #2165 for temperature performance out of 14005 panels ## Questions ### What warranty does the Renesola RS7-615~635NBG-E2 series come with? The RS7-615~635NBG-E2 modules include a 15-year product warranty covering material and workmanship defects, plus a 30-year linear power output warranty. Renesola guarantees predictable performance over three decades of system operation — a premium standard consistent with the long-term stability expected from N-type TOPCon cell technology. ### How do the Renesola RS7-615~635NBG-E2 panels compare to older PERC modules? The N-type TOPCon cells in the RS7-615~635NBG-E2 series deliver lower light-induced degradation (LID) and higher conversion efficiency than conventional PERC technology. In practice, this means more stable energy yields over the system lifetime and better performance on hot days, since N-type TOPCon modules have a lower temperature coefficient than PERC and lose less output as temperatures rise. ### Are the RS7-615~635NBG-E2 panels suitable for utility-scale ground-mount solar farms? Yes, the RS7-615~635NBG-E2 series is designed with large ground-mount installations in mind. The bifacial dual-glass design captures reflected light from the ground surface (albedo effect), adding 3–15% to energy yield depending on ground cover. The high unit power of up to 635 Wp also reduces the module count needed to reach the target system capacity, lowering overall BoS costs. ### What bifacial gain can I realistically expect from the RS7-615~635NBG-E2? Bifacial gain depends on ground albedo and module mounting height above the surface. Light-colored gravel or a white roofing membrane typically delivers an additional 5–15% energy output from the rear side. On grass or standard soil, the gain is usually 3–8%. The exact bifacial yield should be modeled during system design using site-specific albedo measurements and a validated simulation tool. ### Is Renesola a reliable manufacturer — can I trust the RS7-615~635NBG-E2 long-term? Renesola holds Bloomberg NEF Tier 1 manufacturer status, confirming the financial stability required to honor long-term warranties over a 30-year horizon. The company has been active in the solar industry for over 20 years with a consistent track record of European market deliveries. The RS7-615~635NBG-E2 series is not discontinued and remains in active production with full manufacturer support. ### Can the Renesola RS7-615~635NBG-E2 be installed on a flat roof? Yes, the dual-glass RS7-615~635NBG-E2 modules are well suited for flat-roof applications. The rigid dual-glass construction improves mechanical resistance and moisture protection compared to framed alternatives. The bifacial design provides additional benefit when a white TPO/PVC membrane or light-colored gravel reflects irradiance onto the rear side. Mounting at a 10–15° tilt also enables self-cleaning by rainwater, reducing maintenance needs. ## Datasheet [Manufacturer datasheet (PDF)](https://comparepv.com/datasheets/rs7-615-635nbg-n-type-182-156-bifacial-module-with-dual-glas-c01c2b317f4f.pdf) ## Alternatives | Panel | Power | How it differs | | --- | --- | --- | | [AIKO AIKO-A650-MAE72Mw](https://comparepv.com/panel/aiko-aiko-a650-mae72mw) | 650 W | +30 W, lighter, +3.0 pp | | [AIKO AIKO-A645-MAE72Mw](https://comparepv.com/panel/aiko-aiko-a645-mae72mw) | 645 W | Cooler, lighter, +2.8 pp | | [AIKO AIKO-G670-MCH72Mw](https://comparepv.com/panel/aiko-aiko-g670-mch72mw) | 670 W | +50 W, lighter, +2.6 pp | | [Longi Solar LR7-72HVHF-670M](https://comparepv.com/panel/longi-lr7-72hvhf-670m) | 670 W | +50 W, lighter, +2.6 pp | | [AIKO AIKO-A640-MAE72Mw](https://comparepv.com/panel/aiko-aiko-a640-mae72mw) | 640 W | Cooler, lighter, +2.6 pp | | [Jinko Solar JKM650-670N-66QL6-BDV (670W class)](https://comparepv.com/panel/jinko-solar-jkm650-670n-66ql6-bdv-670w-class) | 670 W | +50 W, cooler, +2.6 pp | | [Renesola RS7-615N-E2](https://comparepv.com/panel/renesola-rs7-615n-e2) | 615 W | Lighter | | [Renesola RS7-625N-E2](https://comparepv.com/panel/renesola-rs7-625n-e2) | 625 W | Lighter | | [Renesola RS7-630N-E2](https://comparepv.com/panel/renesola-rs7-630n-e2) | 630 W | +10 W, lighter, +0.4 pp | | [Renesola RS7-635N-E2](https://comparepv.com/panel/renesola-rs7-635n-e2) | 635 W | +15 W, lighter, +0.5 pp | | [AIKO AIKO-A680-MDE72Mw](https://comparepv.com/panel/aiko-aiko-a680-mde72mw) | 680 W | +60 W, lighter, +3.0 pp | | [AIKO AIKO-A675-MDE72Mw](https://comparepv.com/panel/aiko-aiko-a675-mde72mw) | 675 W | +55 W, lighter, +2.8 pp | | [AIKO AIKO-A700-MAE78Dw](https://comparepv.com/panel/aiko-aiko-a700-mae78dw) | 700 W | +80 W, cooler, +2.8 pp | | [AIKO AIKO-A695-MAE78Dw](https://comparepv.com/panel/aiko-aiko-a695-mae78dw) | 695 W | +75 W, cooler, +2.7 pp | --- Source: https://comparepv.com/panel/renesola-rs7-620nbg-e2 Not in this file, on the page: a thirty-year output simulator, a bifacial gain calculator and alternatives filtered by how closely they match these dimensions.