--- title: "Astronergy CHSM78N(DG)/F-BH 645W 645W Solar Panel - Specs & Review | ComparePV" description: "Astronergy CHSM78N(DG)/F-BH 645W 645W solar panel. Specs: 23.10% efficiency, Monocrystalline cells, dimensions, warranty and temperature coefficient." source: "https://comparepv.com/panel/astronergy-chint-new-energy-technology-co-ltd-chsm78n-dg-f-bh-645w" updated: 2026-09-11 --- # Astronergy CHSM78N(DG)/F-BH 645W Solid all-round for its segment 1,086 panels in the segment TOPCon 600-650 W ## Identity - **Manufacturer:** Astronergy - **Model:** CHSM78N(DG)/F-BH 645W - **Series:** ASTRO N5 (Bifacial Series) - **Rated power:** 645 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) | 645 W | 620 W | Strong - top 3% | | | Module efficiency | 23.10% | 22.80% | Typical | 1,570 | | Power density | 230.7 | 227.7 | Typical | 1,654 | | Temperature coefficient | -0.290 | -0.290 | Typical | 2,165 | | Weight (kg) | 34.7 kg | 32.7 kg | Typical | | | Performance warranty | 30 yrs | 30 yrs | Typical | 21 | ### Full peer table | Measure | This panel | Segment median | Standing | Rank | | --- | --- | --- | --- | --- | | Module efficiency | 23.10% | 22.80% | Typical | 1,570 | | Power density | 230.7 | 227.7 | Typical | 1,654 | | Temperature coefficient | -0.290 | -0.290 | Typical | 2,165 | | Weight per kWp | 53.8 | 53.1 | Typical | 7,876 | | Performance warranty | 30 yrs | 30 yrs | Typical | 21 | - **Best for:** Commercial, utility-scale and hot-climate. ## Specification ### Electrical - **Rated power (Pmax):** 645 W - **Efficiency:** 23.10 % - **Voltage at Pmax (Vmp):** 48.03 V - **Current at Pmax (Imp):** 13.43 A - **Open-circuit voltage (Voc):** 57.08 V - **Short-circuit current (Isc):** 14.20 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:** 156 - **Bifacial:** yes ### Physical - **Length:** 2465 mm - **Width:** 1134 mm - **Thickness:** 30 mm - **Weight:** 34.7 kg - **Area:** 2.80 m2 - **Power density:** 230.7 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:** 564 W ## Rank in the whole catalogue | Measure | Position | | --- | --- | | Efficiency | 1570 of 14005 | | Power density | 1654 of 14005 | | Temperature coefficient | 2165 of 14005 | | Weight | 7876 of 14005 | | Warranty | 21 of 14005 | ## Pros - **Low degradation: ≤0.4%/year over 30 years** - The manufacturer's warranty guarantees ≤1.0% degradation in the first year and ≤0.4%/year in years 2-30, which translates to maintaining a minimum of 84.95% of the nominal power after 30 years. This is better than the standard 25-year warranties offered by some comparable products (e.g., Einnova Solarline), and is comparable to those offered by leading brands. - **Temperature coefficient \<-0.29%/°C** - The n-type TOPCon 4.0 technology allows for a temperature coefficient below -0.29%/°C for Pmax – better than typical PERC modules (-0.34 to -0.36%/°C). In practice, this means a significantly higher power output on hot, sunny days, which is crucial for C&I installations in continental climates. - **Tier-1 bank with strong credit rating, ranked 6th by BNEF** - Astronergy is ranked among the top 6 module manufacturers according to the BloombergNEF bankability ranking (2023) and maintains Tier-1 status in subsequent assessments, including Q1 2026. With a production capacity of 56,000 MW (Q2 2025), it facilitates the financing of PV farm and C&I projects without the additional security requirements associated with less established manufacturers. - **30-year power warranty** - The manufacturer offers a 30-year linear warranty (at least 84.95% after 30 years) along with a 15-year product warranty. A comparable product from Einnova Solarline offers the same range, but Jinko Solar Tiger Neo series 66HL4M-BDX is limited to 25 years in standard – the longer warranty offered by Astronergy reduces investment risk for long-term projects. - **Bifacial + SMBB for increased efficiency** - The bifacial (two-sided) design allows for an additional 5–30% energy yield from reflected light, depending on the surface albedo (light gray gravel, membrane, sandy soil). The SMBB (Semi-Multi-Busbar) technology reduces the internal resistance of the cell and increases its resistance to microcracks, which directly translates into improved energy yield stability throughout the lifespan of the installation. ## Cons - **Efficiency of 23.3% compared to the segment leader's 24.06%** - The maximum efficiency of the module is 23.3%, while a comparable Jinko Solar Tiger Neo 66HL4M-BDX module achieves 24.06% at the same 650 Wp power class. A difference of 0.76% in efficiency means that Jinko packs the same power onto approximately 3.2% less surface area – a significant advantage when installing on space-constrained roofs, where every square meter translates into installed kilowatts. ## About this series The Astronergy ASTRO N5 (Bifacial Series) is designed to maximize yields where every additional kilowatt-hour counts, effectively harnessing reflected light from the ground thanks to its dual-sided operation. A key feature is **n-type TOPCon 4.0 technology**, which ensures stable performance over time and minimizes typical losses found in older solutions, leading to a more predictable energy yield throughout the installation's lifespan. Furthermore, the **bifacial design** enhances results in projects on bright rooftops, membranes, and high-albedo grounds. In practice, ASTRO N5 helps reduce energy costs in C&I and utility-scale projects by combining high power density with solutions that improve reliability, such as **SMBB**, supporting better current collection and greater resistance to micro-cracking. Its advantage in challenging conditions is also the **optimized temperature coefficient**, enabling the modules to maintain better performance in hot weather. This is the series for investors focused on real-world gains and reliable operation, not just catalog specifications. ## Notable figures - At 23.1% efficiency, this panel is on par with typical \*\*TOPCon 600-650W\*\* modules - 230.7 W/m² power density - 3.0 W/m² more than \*\*TOPCon 600-650W\*\* median (227.7 W/m²), more power per roof area - Temperature coefficient of -0.29%/°C matches the \*\*TOPCon 600-650W\*\* median - At 34.7 kg (2.0 kg above \*\*TOPCon 600-650W\*\* median of 32.7 kg), requires checking roof load capacity - Bifaciality factor of 80% can add 4-12% extra yield with reflective mounting surface ## Questions ### What warranty coverage is provided for the Astronergy ASTRO N5 Bifacial series? The ASTRO N5 Bifacial series comes with a 15-year product warranty covering material and workmanship defects, along with a 30-year linear power output warranty. After the first year, the module retains at least 99% of its nominal power; after 30 years, the guaranteed output floor is 87.4%. Annual degradation from year 2 onward is capped at 0.4%, placing it among the lowest degradation rates in the n-type module segment. Astronergy is a Tier 1 manufacturer, and the warranty is backed by an international insurance provider. ### Do the ASTRO N5 Bifacial panels perform well during summer heat waves? Yes, the ASTRO N5 Bifacial series handles elevated temperatures more effectively than older PERC modules. The power temperature coefficient is only -0.29%/°C, meaning power losses remain modest even when the module reaches high operating temperatures. For comparison, typical p-type modules exhibit coefficients between -0.35% and -0.40%/°C. In practice, this translates into measurably higher energy yield on hot days — a particularly significant advantage for industrial rooftop systems and utility-scale PV farms operating year-round. ### What is the TOPCon 4.0 technology used in the ASTRO N5, and is the premium price justified? TOPCon 4.0 is an n-type cell architecture featuring a thin tunnel oxide passivation layer that suppresses carrier recombination. The result is a module efficiency of up to 23.3% and a slower degradation rate compared to conventional PERC cells. Astronergy's 4.0 generation additionally integrates SMBB (Super Multi Busbar) technology, which improves current collection efficiency and enhances resistance to microcracks. For the system owner, this means more energy harvested from the same roof area and more predictable performance over a 30-year operational lifetime — making the incremental cost difference justifiable on a levelized cost of energy (LCOE) basis. ### Do the ASTRO N5 Bifacial panels genuinely produce more energy, and when does bifaciality make practical sense? Yes, though the energy gain depends heavily on the albedo of the surface beneath the array. The highest bifacial yield gains are achieved in ground-mounted systems installed over light-colored gravel or reflective membranes, white or light gray rooftops, and agrivoltaic (agro-PV) applications. Under typical conditions, the effective capture of reflected irradiance can deliver an additional 5–15% annual energy yield compared to a monofacial module of equivalent rated power. On dark bituminous rooftops, the bifacial gain is negligible, which is why bifacial modules deliver their strongest return on investment in commercial & industrial (C&I) and utility-scale PV projects. ### How much does the Astronergy ASTRO N5 650W panel weigh, and can a standard roof structure support it? The ASTRO N5 650 Wp module measures 2465 × 1134 × 30 mm and weighs approximately 34.7 kg. This module is intended primarily for industrial rooftop installations and ground-mounted PV farms, where professional steel or aluminum racking structures are used. For residential pitched roofs, the smaller models within the same series — rated at 585–605 Wp and weighing approximately 31 kg — are generally a better fit. Regardless of the model selected, a structural assessment by a licensed structural engineer is always recommended before installation. ### Are the Astronergy ASTRO N5 Bifacial panels compatible with widely available inverters and mounting systems on the Polish market? Yes, the ASTRO N5 Bifacial series is fully compatible with all standard string inverters and microinverters available on the market, including SMA, Fronius, Huawei, SolarEdge, and Growatt. MC4 connectors ensure compatibility with conventional DC cabling systems. The modules are certified to IEC 61215 and IEC 61730 and comply with the standards required under Polish construction and energy regulations. The standard aluminum frame dimensions are compatible with the majority of rail-based mounting systems carried by Polish distributors. ## Datasheet [Manufacturer datasheet (PDF)](https://comparepv.com/datasheets/630650astro-n5-chsm78ndgf-bh-2465x1134x30-en-20250819-1-c4fc330e6f21.pdf) ## Alternatives | Panel | Power | How it differs | | --- | --- | --- | | [AIKO AIKO-A650-MAE72Mw](https://comparepv.com/panel/aiko-aiko-a650-mae72mw) | 650 W | Cooler, lighter, +2.1 pp | | [AIKO AIKO-A680-MDE72Mw](https://comparepv.com/panel/aiko-aiko-a680-mde72mw) | 680 W | +35 W, lighter, +2.1 pp | | [AIKO AIKO-A675-MDE72Mw](https://comparepv.com/panel/aiko-aiko-a675-mde72mw) | 675 W | +30 W, lighter, +1.9 pp | | [AIKO AIKO-A645-MAE72Mw](https://comparepv.com/panel/aiko-aiko-a645-mae72mw) | 645 W | Cooler, lighter, +1.9 pp | | [AIKO AIKO-A695-MAE78Dw](https://comparepv.com/panel/aiko-aiko-a695-mae78dw) | 695 W | +50 W, cooler, +1.8 pp | | [AIKO AIKO-G670-MCH72Mw](https://comparepv.com/panel/aiko-aiko-g670-mch72mw) | 670 W | Cooler, lighter, +1.7 pp | | [Longi Solar LR7-72HVHF-670M](https://comparepv.com/panel/longi-lr7-72hvhf-670m) | 670 W | Cooler, lighter, +1.7 pp | | [Astronergy CHSM78N(DG)/F-BH-625W](https://comparepv.com/panel/astronergy-chsm78n-dg-f-bh-625w) | 625 W | -20 W, -0.7 pp | | [Astronergy CHSM78N(DG)/F-BH-630](https://comparepv.com/panel/astronergy-chint-new-energy-technology-co-ltd-chsm78n-dg-f-bh-630) | 630 W | -15 W, -0.6 pp | | [Astronergy CHSM78N(DG)/F-BH-635](https://comparepv.com/panel/astronergy-chint-new-energy-technology-co-ltd-chsm78n-dg-f-bh-635) | 635 W | -10 W, -0.4 pp | | [Astronergy CHSM78N(DG)/F-BH-640](https://comparepv.com/panel/astronergy-chint-new-energy-technology-co-ltd-chsm78n-dg-f-bh-640) | 640 W | -0.2 pp | | [AIKO AIKO-A700-MAE78Dw](https://comparepv.com/panel/aiko-aiko-a700-mae78dw) | 700 W | +55 W, cooler, +1.9 pp | | [Jinko Solar JKM650-670N-66QL6-BDV (670W class)](https://comparepv.com/panel/jinko-solar-jkm650-670n-66ql6-bdv-670w-class) | 670 W | +25 W, cooler, +1.7 pp | --- Source: https://comparepv.com/panel/astronergy-chint-new-energy-technology-co-ltd-chsm78n-dg-f-bh-645w 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.