--- title: "Astronergy CHSM66RN(DG)/F-BH-640 640W Solar Panel - Specs & Review | ComparePV" description: "Astronergy CHSM66RN(DG)/F-BH-640 640W solar panel. Specs: 23.70% efficiency, Monocrystalline cells, dimensions, warranty and temperature coefficient." source: "https://comparepv.com/panel/astronergy-chsm66rn-dg-f-bh-640" updated: 2026-09-11 --- # Astronergy CHSM66RN(DG)/F-BH-640 Efficiency leader, no clear weak spot 1,086 panels in the segment TOPCon 600-650 W ## Identity - **Manufacturer:** Astronergy - **Model:** CHSM66RN(DG)/F-BH-640 - **Series:** CHSM66RN(DG)/F-BH Bifacial Series (ASTRO N7 2.0) - **Rated power:** 640 W - **Cell technology:** TOPCon - **Bifacial:** yes ## How it compares Compared against segment TOPCon 600-650 W (1086 panels). | Measure | This panel | Segment median | Standing | Rank | | --- | --- | --- | --- | --- | | Power (Wp) | 640 W | 620 W | Strong - top 9% | | | Module efficiency | 23.70% | 22.80% | Strong - top 4% | 517 | | Power density | 236.9 | 227.7 | Strong - top 4% | 521 | | Temperature coefficient | -0.290 | -0.290 | Typical | 2,165 | | Weight (kg) | 31.6 kg | 32.7 kg | Strong - top 18% | | | Performance warranty | 30 yrs | 30 yrs | Typical | 21 | ### Full peer table | Measure | This panel | Segment median | Standing | Rank | | --- | --- | --- | --- | --- | | Module efficiency | 23.70% | 22.80% | Strong - top 4% | 517 | | Power density | 236.9 | 227.7 | Strong - top 4% | 521 | | Temperature coefficient | -0.290 | -0.290 | Typical | 2,165 | | Weight per kWp | 49.5 | 53.1 | Strong - top 18% | 2,987 | | Performance warranty | 30 yrs | 30 yrs | Typical | 21 | ### Strengths - **23.70% module efficiency** - Top 4% of the TOPCon 600-650 W segment, against a median of 22.80%. Ranked 517th in the whole database. - **236.9 watts per square metre** - Top 4% of the TOPCon 600-650 W segment, against a median of 227.7. Ranked 521st in the whole database. - **49.5 kg per kWp** - Top 18% of the TOPCon 600-650 W segment, against a median of 53.1. - **Best for:** Commercial, utility-scale and hot-climate. ## Specification ### Electrical - **Rated power (Pmax):** 640 W - **Efficiency:** 23.70 % - **Voltage at Pmax (Vmp):** 41.99 V - **Current at Pmax (Imp):** 15.24 A - **Open-circuit voltage (Voc):** 49.57 V - **Short-circuit current (Isc):** 16.42 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:** 0.043 %/degC ### Cell and construction - **Cell type:** Monocrystalline - **Cell technology:** TOPCon - **Cell count:** 132 - **Bifacial:** yes ### Physical - **Length:** 2382 mm - **Width:** 1134 mm - **Thickness:** 30 mm - **Weight:** 31.6 kg - **Area:** 2.70 m2 - **Power density:** 236.9 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:** 559 W ## Rank in the whole catalogue | Measure | Position | | --- | --- | | Efficiency | 517 of 14005 | | Power density | 521 of 14005 | | Temperature coefficient | 2165 of 14005 | | Weight | 2987 of 14005 | | Warranty | 21 of 14005 | ## Pros - **Up to 24.1% Efficiency — Best-in-Class for 66-Cell Format** - Peak efficiency of 24.1% places this series on par with the Jinko Tiger Neo 66HL4M-BDX (24.06%) and significantly ahead of the BYD AURO N (23.25%) and Einnova TOPCon (23.25%). For an identical mounting footprint, the module delivers measurably more energy than 90% of competing products in the 625–650 W power class. - **Zero Busbar (ZBB) + TOPCon 5.0: Higher Yield Under Partial Shading** - ZBB technology eliminates resistive losses from busbar metallization, and combined with low-temperature cell interconnection, provides 25% greater resistance to micro-cracks compared to conventional busbar modules. Annual degradation (years 2–30) is ≤0.4%, resulting in more stable energy output throughout the system's full operational lifetime. - **15-Year Product Warranty — Outperforms Jinko** - Astronergy provides a 15-year product warranty, while the Jinko Tiger Neo in the same power class offers only 12 years. The 30-year linear power warranty guaranteeing ≥87.4% of rated output represents a premium standard, backed by independent international insurance coverage. - **Low Temperature Coefficient: -0.29%/°C** - The -0.29%/°C temperature coefficient is better than the typical -0.30% to -0.35% seen in legacy PERC technology and most competitors in the 650 W class. In the Polish climate, where summer module temperatures regularly exceed 60°C, a difference of 0.01–0.06%/°C translates to tens of additional kWh per year per string. - **Top-6 BNEF Bankability — Reliable Project Financing** - Astronergy ranks in the Top 6 of BloombergNEF's global bankability index (2023 report), with a manufacturing capacity of 56 GW/year. Tier-1 status streamlines project financing and satisfies the due diligence requirements of lenders funding utility-scale PV plants and C&I installations. ## About this series The Astronergy CHSM66RN(DG)/F-BH Bifacial (ASTRO N7 2.0) series was designed to maximize energy yield not only from the front but also the rear side of the module. This **bifacial dual-glass** solution better withstands external conditions and operates stably in projects where longevity and predictable production are key. A key advantage of this series is the use of **n-type TOPCon cells** and **ZBB (busbarless)** technology, which minimizes shading losses from metalized busbars and improves current collection. In practice, this means better performance in real installation conditions and higher yield for the same construction surface. Additionally, solutions related to the protection of the edges of the cells support reliability and help minimize losses resulting from micro-cracks. For investors, a significant benefit is the **low Voc**, which facilitates string design and may reduce BOS costs. This series will perform well in PV farms, C&I projects, ground-mounted and rooftop installations, especially where light reflection from the ground can be utilized. ## Notable figures - Efficiency of 23.7% is 0.9pp above the \*\*TOPCon 600-650W\*\* median (22.8%) - 236.9 W/m² power density - 9.2 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 - 31.6 kg weight - 1.1 kg lighter than \*\*TOPCon 600-650W\*\* median (32.7 kg), reducing installation effort - Bifaciality factor of 80% can add 4-12% extra yield with reflective mounting surface ## Questions ### What warranty coverage applies to the Astronergy ASTRO N7 2.0 CHSM66RN(DG)/F-BH panels? The ASTRO N7 2.0 series is covered by a 15-year product warranty and a 30-year linear power output warranty. First-year degradation is capped at 1.0%, with subsequent annual degradation not exceeding 0.4% per year. Astronergy holds Tier 1 manufacturer status, which provides financial backing for warranty claims and ensures that those claims remain enforceable throughout the full operational lifetime of the installation. ### What is ZBB technology in the ASTRO N7 2.0 panels, and does it genuinely improve performance? ZBB (Zero Busbar / busbarless) replaces conventional wide busbars with a grid of 20 ultra-fine interconnections. Because metallic elements no longer shade the cell surface, current collection is directly increased. Astronergy states a cell efficiency gain of 0.4–0.55% and a bifaciality improvement of more than 5% compared to the previous generation. An additional benefit is the more uniform stress distribution across the cell structure, which reduces the risk of microcracks. ### How much additional energy can the bifacial ASTRO N7 2.0 module generate from its rear side? The CHSM66RN(DG)/F-BH series has a bifaciality factor of 80% ±5%. This means that with a favorable ground albedo coefficient — such as light gravel, concrete, or snow — the rear side of the panel can contribute an additional 10–20% of energy on top of the nominal 650 W front-side output. The effect is most pronounced in ground-mounted installations where modules are elevated at an optimal height above the surface. ### Are the ASTRO N7 2.0 panels suitable for utility-scale PV farms and C&I installations? Yes, the CHSM66RN(DG)/F-BH series is engineered for large-scale PV farm projects and commercial & industrial installations. The 2382×1134×30 mm form factor combined with a peak power output of up to 650 W enables high power density per unit area. The dual-glass construction enhances both mechanical strength and UV resistance. The low temperature coefficient of Voc (−0.25%/°C) simplifies string design and can reduce BoS costs by more than 3.5 ct CNY/W. ### Do the n-type TOPCon cells in the ASTRO N7 2.0 perform better under overcast conditions than older p-type panels? Yes. N-type TOPCon cells exhibit a higher current collection efficiency under diffuse light, which translates into superior performance on cloudy days and at low sun angles. An additional advantage is the complete absence of the LID (Light Induced Degradation) effect that progressively reduced the output power of conventional PERC cells during their initial hours of illumination. In practice, this results in higher annual energy yield for the same installed area. ### How does the ASTRO N7 2.0 series differ from the original ASTRO N7? The ASTRO N7 2.0 introduces TOPCon 5.0 technology featuring ultra-fine interconnection grids and ZBB in place of standard busbars, achieving a module efficiency of up to 24.1% compared to approximately 23% in the first-generation N7. Power output has increased from the 600–620 W range to 625–650 W while retaining the identical 2382×1134 mm form factor. The manufacturer also reports improved microcrack resistance attributed to the more uniform stress distribution within the cell structure. ## Datasheet [Manufacturer datasheet (PDF)](https://comparepv.com/datasheets/625650ASTRO-N7-20_CHSM66RNDGF-BH_ZBB_2382x1134x30_EN_20260629-e6454499b787.pdf) ## Alternatives | Panel | Power | How it differs | | --- | --- | --- | | [AIKO AIKO-A650-MAE72Mw](https://comparepv.com/panel/aiko-aiko-a650-mae72mw) | 650 W | Cooler, lighter, +1.5 pp | | [AIKO AIKO-A680-MDE72Mw](https://comparepv.com/panel/aiko-aiko-a680-mde72mw) | 680 W | +40 W, cooler, +1.5 pp | | [AIKO AIKO-A675-MDE72Mw](https://comparepv.com/panel/aiko-aiko-a675-mde72mw) | 675 W | +35 W, cooler, +1.3 pp | | [AIKO AIKO-A645-MAE72Mw](https://comparepv.com/panel/aiko-aiko-a645-mae72mw) | 645 W | Cooler, lighter, +1.3 pp | | [AIKO AIKO-G670-MCH72Mw](https://comparepv.com/panel/aiko-aiko-g670-mch72mw) | 670 W | +30 W, lighter, +1.1 pp | | [Longi Solar LR7-72HVHF-670M](https://comparepv.com/panel/longi-lr7-72hvhf-670m) | 670 W | +30 W, lighter, +1.1 pp | | [AIKO AIKO-A640-MAE72Mw](https://comparepv.com/panel/aiko-aiko-a640-mae72mw) | 640 W | Cooler, lighter, +1.1 pp | | [Astronergy CHSM66RN(DG)/F-BH-600Wp](https://comparepv.com/panel/astronergy-chsm66rn-dg-f-bh-600wp) | 600 W | -40 W, heavier, -1.5 pp | | [Astronergy CHSM66RN(DG)/F-BH-605Wp](https://comparepv.com/panel/astronergy-chsm66rn-dg-f-bh-605wp) | 605 W | -35 W, heavier, -1.3 pp | | [Astronergy CHSM66RN(DG)/F-BH-610Wp](https://comparepv.com/panel/astronergy-chsm66rn-dg-f-bh-610wp) | 610 W | -30 W, heavier, -1.1 pp | | [Astronergy CHSM66RN(DG)/F-BH-615W](https://comparepv.com/panel/astronergy-chint-new-energy-technology-co-ltd-chsm66rn-dg-f-bh-615w) | 615 W | -25 W, -0.9 pp | | [Astronergy CHSM66RN(DG)/F-BH-620W](https://comparepv.com/panel/astronergy-chint-new-energy-technology-co-ltd-chsm66rn-dg-f-bh-620w) | 620 W | -20 W, -0.7 pp | | [AIKO AIKO-A700-MAE78Dw](https://comparepv.com/panel/aiko-aiko-a700-mae78dw) | 700 W | +60 W, cooler, +1.3 pp | | [AIKO AIKO-A695-MAE78Dw](https://comparepv.com/panel/aiko-aiko-a695-mae78dw) | 695 W | +55 W, cooler, +1.2 pp | | [Jinko Solar JKM650-670N-66QL6-BDV (670W class)](https://comparepv.com/panel/jinko-solar-jkm650-670n-66ql6-bdv-670w-class) | 670 W | +30 W, cooler, +1.1 pp | --- Source: https://comparepv.com/panel/astronergy-chsm66rn-dg-f-bh-640 Not in this file, on the page: the I-V and temperature curves lifted from the manufacturer's datasheet, a thirty-year output simulator, a bifacial gain calculator and alternatives filtered by how closely they match these dimensions.