--- title: "Astronergy CHSM78N(DG)/F-BH 645W vs Astronergy CHSM78N(DG)/F-BH-650W - Solar Panel Comparison | ComparePV" description: "Compare Astronergy CHSM78N(DG)/F-BH 645W vs Astronergy CHSM78N(DG)/F-BH-650W side by side: what actually differs, output when it is hot, thirty-year production, and the full specification." source: "https://comparepv.com/compare/astronergy-chint-new-energy-technology-co-ltd-chsm78n-dg-f-bh-645w/astronergy-chsm78n-dg-f-bh-650w" updated: 2026-09-11 --- # Astronergy CHSM78N(DG)/F-BH 645W vs Astronergy CHSM78N(DG)/F-BH-650W BH-650W leads on the differences that matter The largest is module efficiency: 0.20 pp more efficient. 18 of 19 comparable parameters are identical. ## The two panels | Attribute | A | B | | --- | --- | --- | | Panel | [Astronergy CHSM78N(DG)/F-BH 645W](https://comparepv.com/panel/astronergy-chint-new-energy-technology-co-ltd-chsm78n-dg-f-bh-645w) | [Astronergy CHSM78N(DG)/F-BH-650W](https://comparepv.com/panel/astronergy-chsm78n-dg-f-bh-650w) | | Manufacturer | Astronergy | Astronergy | | Power | 645 Wp | 650 Wp | | Efficiency | 23.10 % | 23.30 % | | Technology | TOPCon | TOPCon | ## Where they differ Ranked by how much the difference matters, not by datasheet order. | Parameter | BH 645W | BH-650W | Difference | | --- | --- | --- | --- | | Module efficiency | 23.10 % | 23.30 % | +0.20 pp for BH-650W | ## Every compared parameter | Parameter | BH 645W | BH-650W | | --- | --- | --- | | Rated power | 645 Wp | 650 Wp | | Module efficiency | 23.10 % | 23.30 % | | Power density | 230.7 Wp/m² | 232.5 Wp/m² | | Open-circuit voltage | 57.08 V | 57.01 V | | Voltage at max power | 48.03 V | 47.12 V | | Short-circuit current | 14.20 A | 14.51 A | | Current at max power | 13.43 A | 13.80 A | | Temperature coefficient | -0.290 %/°C | -0.290 %/°C | | Dimensions | 2465x1134x30 mm | 2465x1134x30 mm | | Module area | 2.795 m² | 2.795 m² | | Weight | 34.7 kg | 34.7 kg | | Weight per kWp | 53.8 kg/kWp | 53.4 kg/kWp | | Product warranty | 15 yrs | 15 yrs | | Performance warranty | 30 yrs | 30 yrs | | Annual degradation | 0.40 %/yr | 0.40 %/yr | | Cell technology | TOPCon | TOPCon | | Cell type | Monocrystalline | Monocrystalline | | Cell count | 156 | 156 | | Bifacial | Yes | Yes | ## Thirty-year yield Each panel's own declared degradation curve, at 1,200 kWh/kWp a year Same temp coeff. for both panels (-0.290 %/°C), so a warmer roof scales both curves by the same factor: the totals fall together and neither panel gains on the other. - **Cumulative output, BH 645W:** 21,641 kWh - **Cumulative output, BH-650W:** 21,809 kWh - **Gap:** 168 kWh ## Output when hot | Condition | Cell temperature | BH 645W | BH-650W | Retained | | --- | --- | --- | --- | --- | | Standard test conditions | 25 °C | 645 W | 650 W | 100.0% of rated power | | Cool, bright day | 40 °C | 617 W | 622 W | 95.7% of rated power | | Typical summer roof | 55 °C | 589 W | 593 W | 91.3% of rated power | | Hot roof | 70 °C | 561 W | 565 W | 87.0% of rated power | ## Against the whole database | Measure | BH 645W | BH-650W | Out of | Note | | --- | --- | --- | --- | --- | | Efficiency | #1,570 | #1,017 | 14,005 | BH-650W leads by 553 places | | Power density | #1,654 | #1,222 | 14,005 | BH-650W leads by 432 places | | Heat behaviour | #2,165 | #2,165 | 14,005 | Tied - the same position in the database | | Weight | #7,876 | #7,283 | 14,005 | BH-650W leads by 593 places | | Warranty | #21 | #21 | 14,005 | Tied - the same position in the database | | Overall | #1,496 | #1,318 | 14,005 | BH-650W leads by 178 places | ## Questions ### Which panel is better: Astronergy CHSM78N(DG)/F-BH 645W or Astronergy CHSM78N(DG)/F-BH-650W? According to our database: **Astronergy CHSM78N(DG)/F-BH-**650 W**** has higher module efficiency (**23.30%** vs **23.10%**). See the full spec comparison and 30-year energy simulation above for a complete picture. ### What is the efficiency of Astronergy CHSM78N(DG)/F-BH 645W and Astronergy CHSM78N(DG)/F-BH-650W? **Astronergy CHSM78N(DG)/F-BH **645 W**** has a module efficiency of **23.10%**, while **Astronergy CHSM78N(DG)/F-BH-**650 W**** is **23.30%**. Higher efficiency means more electricity from the same roof area - useful when space is limited. ### What cell technology does Astronergy CHSM78N(DG)/F-BH 645W use vs Astronergy CHSM78N(DG)/F-BH-650W? **Astronergy CHSM78N(DG)/F-BH **645 W**** uses **TOPCon** cells; **Astronergy CHSM78N(DG)/F-BH-**650 W**** uses **TOPCon**. Modern **n-type** technologies (**TOPCon**, **HJT**, BC) typically deliver higher efficiency and lower degradation compared to older **PERC** (p-type) cells. ### What is the warranty on Astronergy CHSM78N(DG)/F-BH 645W and Astronergy CHSM78N(DG)/F-BH-650W? **Astronergy CHSM78N(DG)/F-BH **645 W**** has a **30 years** power warranty; **Astronergy CHSM78N(DG)/F-BH-**650 W**** has a **30 years** power warranty. The power warranty guarantees a minimum percentage of rated output at the end of the warranty period (typically 80**-87%**). Product (materials) warranties are usually shorter. ### Are Astronergy CHSM78N(DG)/F-BH 645W and Astronergy CHSM78N(DG)/F-BH-650W bifacial panels? Both **Astronergy CHSM78N(DG)/F-BH **645 W**** and **Astronergy CHSM78N(DG)/F-BH-**650 W**** are bifacial - they capture reflected light from the ground, which can add 5**-15%** more annual energy on ground-mount or elevated rooftop installations with a light surface beneath. ## Related comparisons - [Astronergy CHSM78N(DG)/F-BH 645W vs Astronergy CHSM78N(DG)/F-BH 650W](https://comparepv.com/compare/astronergy-chint-new-energy-technology-co-ltd-chsm78n-dg-f-bh-645w/astronergy-chint-new-energy-technology-co-ltd-chsm78n-dg-f-bh-650w) - One difference: module efficiency - [Astronergy CHSM78N(DG)/F-BH 645W vs Astronergy CHSM78N(DG)/F-BH-645W](https://comparepv.com/compare/astronergy-chint-new-energy-technology-co-ltd-chsm78n-dg-f-bh-645w/astronergy-chsm78n-dg-f-bh-645w) - One difference: voltage at max power - [Astronergy CHSM78N(DG)/F-BH 645W vs Astronergy CHSM78N(DG)/F-BH 640W](https://comparepv.com/compare/astronergy-chint-new-energy-technology-co-ltd-chsm78n-dg-f-bh-645w/astronergy-chint-new-energy-technology-co-ltd-chsm78n-dg-f-bh-640w) - One difference: module efficiency - [Astronergy CHSM78N(DG)/F-BH 645W vs Astronergy CHSM78N(DG)/F-BH-640W](https://comparepv.com/compare/astronergy-chint-new-energy-technology-co-ltd-chsm78n-dg-f-bh-645w/astronergy-chsm78n-dg-f-bh-640w) - 2 differences, the largest is module efficiency - [Astronergy CHSM78N(DG)/F-BH 645W vs Astronergy CHSM78N(DG)/F-BH 635W](https://comparepv.com/compare/astronergy-chint-new-energy-technology-co-ltd-chsm78n-dg-f-bh-645w/astronergy-chint-new-energy-technology-co-ltd-chsm78n-dg-f-bh-635w) - 3 differences, the largest is module efficiency - [Astronergy CHSM78N(DG)/F-BH 645W vs Astronergy CHSM78N(DG)/F-BH-635W](https://comparepv.com/compare/astronergy-chint-new-energy-technology-co-ltd-chsm78n-dg-f-bh-645w/astronergy-chsm78n-dg-f-bh-635w) - 4 differences, the largest is module efficiency --- Source: https://comparepv.com/compare/astronergy-chint-new-energy-technology-co-ltd-chsm78n-dg-f-bh-645w/astronergy-chsm78n-dg-f-bh-650w Not in this file, on the page: the thirty-year yield curve year by year at a cell temperature you pick and a written summary generated on request.