--- title: "Astronergy CHSM66RN(DG)/F-BQ-645 vs Astronergy CHSM66RN(DG)/F-BQ-650 - Solar Panel Comparison | ComparePV" description: "Compare Astronergy CHSM66RN(DG)/F-BQ-645 vs Astronergy CHSM66RN(DG)/F-BQ-650 side by side: what actually differs, output when it is hot, thirty-year production, and the full specification." source: "https://comparepv.com/compare/astronergy-chsm66rn-dg-f-bq-645/astronergy-chsm66rn-dg-f-bq-650" updated: 2026-09-11 --- # Astronergy CHSM66RN(DG)/F-BQ-645 vs Astronergy CHSM66RN(DG)/F-BQ-650 650 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 CHSM66RN(DG)/F-BQ-645](https://comparepv.com/panel/astronergy-chsm66rn-dg-f-bq-645) | [Astronergy CHSM66RN(DG)/F-BQ-650](https://comparepv.com/panel/astronergy-chsm66rn-dg-f-bq-650) | | Manufacturer | Astronergy | Astronergy | | Power | 645 Wp | 650 Wp | | Efficiency | 23.90 % | 24.10 % | | Technology | TOPCon | TOPCon | ## Where they differ Ranked by how much the difference matters, not by datasheet order. | Parameter | 645 | 650 | Difference | | --- | --- | --- | --- | | Module efficiency | 23.90 % | 24.10 % | +0.20 pp for 650 | ## Every compared parameter | Parameter | 645 | 650 | | --- | --- | --- | | Rated power | 645 Wp | 650 Wp | | Module efficiency | 23.90 % | 24.10 % | | Power density | 238.8 Wp/m² | 240.6 Wp/m² | | Open-circuit voltage | 48.83 V | 48.98 V | | Voltage at max power | 41.02 V | 41.14 V | | Short-circuit current | 16.50 A | 16.58 A | | Current at max power | 15.73 A | 15.80 A | | Temperature coefficient | -0.260 %/°C | -0.260 %/°C | | Dimensions | 2382x1134x30 mm | 2382x1134x30 mm | | Module area | 2.701 m² | 2.701 m² | | Weight | 32.0 kg | 32.0 kg | | Weight per kWp | 49.6 kg/kWp | 49.2 kg/kWp | | Product warranty | 15 yrs | 15 yrs | | Performance warranty | 30 yrs | 30 yrs | | Annual degradation | 0.35 %/yr | 0.35 %/yr | | Cell technology | TOPCon | TOPCon | | Cell type | Monocrystalline | Monocrystalline | | Cell count | 264 | 264 | | 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 (-0.260 %/°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, 645:** 21,809 kWh - **Cumulative output, 650:** 21,978 kWh - **Gap:** 169 kWh ## Output when hot | Condition | Cell temperature | 645 | 650 | Retained | | --- | --- | --- | --- | --- | | Standard test conditions | 25 °C | 645 W | 650 W | 100.0% of rated power | | Cool, bright day | 40 °C | 620 W | 625 W | 96.1% of rated power | | Typical summer roof | 55 °C | 595 W | 599 W | 92.2% of rated power | | Hot roof | 70 °C | 570 W | 574 W | 88.3% of rated power | ## Against the whole database | Measure | 645 | 650 | Out of | Note | | --- | --- | --- | --- | --- | | Efficiency | #351 | #219 | 14,005 | 650 leads by 132 places | | Power density | #356 | #233 | 14,005 | 650 leads by 123 places | | Heat behaviour | #511 | #511 | 14,005 | Tied - the same position in the database | | Weight | #3,158 | #2,810 | 14,005 | 650 leads by 348 places | | Warranty | #21 | #21 | 14,005 | Tied - the same position in the database | | Overall | #1,068 | #878 | 14,005 | 650 leads by 190 places | ## Questions ### Which panel is better: Astronergy CHSM66RN(DG)/F-BQ-645 or Astronergy CHSM66RN(DG)/F-BQ-650? According to our database: **Astronergy CHSM66RN(DG)/F-BQ-650** has higher module efficiency (**24.10%** vs **23.90%**). See the full spec comparison and 30-year energy simulation above for a complete picture. ### What is the efficiency of Astronergy CHSM66RN(DG)/F-BQ-645 and Astronergy CHSM66RN(DG)/F-BQ-650? **Astronergy CHSM66RN(DG)/F-BQ-645** has a module efficiency of **23.90%**, while **Astronergy CHSM66RN(DG)/F-BQ-650** is **24.10%**. Higher efficiency means more electricity from the same roof area - useful when space is limited. ### What cell technology does Astronergy CHSM66RN(DG)/F-BQ-645 use vs Astronergy CHSM66RN(DG)/F-BQ-650? **Astronergy CHSM66RN(DG)/F-BQ-645** uses **TOPCon** cells; **Astronergy CHSM66RN(DG)/F-BQ-650** 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 CHSM66RN(DG)/F-BQ-645 and Astronergy CHSM66RN(DG)/F-BQ-650? **Astronergy CHSM66RN(DG)/F-BQ-645** has a **30 years** power warranty; **Astronergy CHSM66RN(DG)/F-BQ-650** 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 CHSM66RN(DG)/F-BQ-645 and Astronergy CHSM66RN(DG)/F-BQ-650 bifacial panels? Both **Astronergy CHSM66RN(DG)/F-BQ-645** and **Astronergy CHSM66RN(DG)/F-BQ-650** 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 CHSM66RN(DG)/F-BQ-645 vs Astronergy CHSM66RN(DG)/F-BQ-670](https://comparepv.com/compare/astronergy-chsm66rn-dg-f-bq-645/astronergy-chsm66rn-dg-f-bq-670) - 3 differences, the largest is module efficiency - [Astronergy CHSM66RN(DG)/F-BQ-645 vs Astronergy CHSM66RN(DG)/F-BQ](https://comparepv.com/compare/astronergy-chsm66rn-dg-f-bq-645/astronergy-chsm66rn-dg-f-bq) - 3 differences, the largest is module efficiency - [Astronergy CHSM66RN(DG)/F-BQ-645 vs Astronergy CHSM66RN(DG)/F-BQ-665](https://comparepv.com/compare/astronergy-chsm66rn-dg-f-bq-645/astronergy-chsm66rn-dg-f-bq-665) - 3 differences, the largest is module efficiency - [Astronergy CHSM66RN(DG)/F-BQ-645 vs Astronergy CHSM66RN(DG)/F-BQ-660](https://comparepv.com/compare/astronergy-chsm66rn-dg-f-bq-645/astronergy-chsm66rn-dg-f-bq-660) - 3 differences, the largest is module efficiency - [Astronergy CHSM66RN(DG)/F-BQ-645 vs Astronergy CHSM66RN(DG)/F-BQ-655](https://comparepv.com/compare/astronergy-chsm66rn-dg-f-bq-645/astronergy-chsm66rn-dg-f-bq-655) - 3 differences, the largest is module efficiency - [Astronergy CHSM66RN(DG)/F-BQ-645 vs Astronergy CHSM66N(DG)/F-BH-735](https://comparepv.com/compare/astronergy-chsm66rn-dg-f-bq-645/astronergy-chsm66n-dg-f-bh-735) - 11 differences, the largest is rated power --- Source: https://comparepv.com/compare/astronergy-chsm66rn-dg-f-bq-645/astronergy-chsm66rn-dg-f-bq-650 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.