--- title: "Adani Solar ASB-M12-132-640 vs Adani Solar ASB-M12-132-645 - Solar Panel Comparison | ComparePV" description: "Compare Adani Solar ASB-M12-132-640 vs Adani Solar ASB-M12-132-645 side by side: what actually differs, output when it is hot, thirty-year production, and the full specification." source: "https://comparepv.com/compare/adani-solar-asb-m12-132-640/adani-solar-asb-m12-132-645" updated: 2026-09-12 --- # Adani Solar ASB-M12-132-640 vs Adani Solar ASB-M12-132-645 Identical on every published parameter All 19 comparable parameters agree. Two records this alike are usually one panel sold under two names, or two bins of the same production line - decide on price and on who you would rather buy from. ## The two panels | Attribute | A | B | | --- | --- | --- | | Panel | [Adani Solar ASB-M12-132-640](https://comparepv.com/panel/adani-solar-asb-m12-132-640) | [Adani Solar ASB-M12-132-645](https://comparepv.com/panel/adani-solar-asb-m12-132-645) | | Manufacturer | Adani Solar | Adani Solar | | Power | 640 Wp | 645 Wp | | Efficiency | 20.55 % | 20.71 % | | Technology | PERC | PERC | ## Every compared parameter | Parameter | 640 | 645 | | --- | --- | --- | | Rated power | 640 Wp | 645 Wp | | Module efficiency | 20.55 % | 20.71 % | | Power density | 205.5 Wp/m² | 207.1 Wp/m² | | Open-circuit voltage | 43.28 V | 43.47 V | | Voltage at max power | 37.01 V | 37.15 V | | Short-circuit current | 18.69 A | 18.75 A | | Current at max power | 17.31 A | 17.37 A | | Temperature coefficient | -0.350 %/°C | -0.350 %/°C | | Dimensions | 2390x1303x35 mm | 2390x1303x35 mm | | Module area | 3.114 m² | 3.114 m² | | Weight | 33.6 kg | 33.6 kg | | Weight per kWp | 52.5 kg/kWp | 52.1 kg/kWp | | Product warranty | 12 yrs | 12 yrs | | Performance warranty | 30 yrs | 30 yrs | | Annual degradation | 0.55 %/yr | 0.55 %/yr | | Cell technology | PERC | PERC | | Cell type | Monocrystalline | Monocrystalline | | Cell count | 132 | 132 | | 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 (-0.350 %/°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, 640:** 20,742 kWh - **Cumulative output, 645:** 20,904 kWh - **Gap:** 162 kWh ## Output when hot | Condition | Cell temperature | 640 | 645 | Retained | | --- | --- | --- | --- | --- | | Standard test conditions | 25 °C | 640 W | 645 W | 100.0% of rated power | | Cool, bright day | 40 °C | 606 W | 611 W | 94.8% of rated power | | Typical summer roof | 55 °C | 573 W | 577 W | 89.5% of rated power | | Hot roof | 70 °C | 539 W | 543 W | 84.2% of rated power | ## Against the whole database | Measure | 640 | 645 | Out of | Note | | --- | --- | --- | --- | --- | | Efficiency | #11,208 | #10,721 | 14,005 | 645 leads by 487 places | | Power density | #11,191 | #10,759 | 14,005 | 645 leads by 432 places | | Heat behaviour | #10,419 | #10,419 | 14,005 | Tied - the same position in the database | | Weight | #6,043 | #5,539 | 14,005 | 645 leads by 504 places | | Warranty | #21 | #21 | 14,005 | Tied - the same position in the database | | Overall | #4,636 | #4,257 | 14,005 | 645 leads by 379 places | ## Questions ### Which panel is better: Adani Solar ASB-M12-132-640 or Adani Solar ASB-M12-132-645? According to our database: **Adani Solar ASB-M12-132-645** has higher module efficiency (**20.71%** vs **20.55%**). See the full spec comparison and 30-year energy simulation above for a complete picture. ### What is the efficiency of Adani Solar ASB-M12-132-640 and Adani Solar ASB-M12-132-645? **Adani Solar ASB-M12-132-640** has a module efficiency of **20.55%**, while **Adani Solar ASB-M12-132-645** is **20.71%**. Higher efficiency means more electricity from the same roof area - useful when space is limited. ### What cell technology does Adani Solar ASB-M12-132-640 use vs Adani Solar ASB-M12-132-645? **Adani Solar ASB-M12-132-640** uses **PERC** cells; **Adani Solar ASB-M12-132-645** uses **PERC**. 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 Adani Solar ASB-M12-132-640 and Adani Solar ASB-M12-132-645? **Adani Solar ASB-M12-132-640** has a **30 years** power warranty; **Adani Solar ASB-M12-132-645** 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 Adani Solar ASB-M12-132-640 and Adani Solar ASB-M12-132-645 bifacial panels? Both **Adani Solar ASB-M12-132-640** and **Adani Solar ASB-M12-132-645** 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 - [Adani Solar ASB-M12-132-640 vs Adani Solar ASB-M12-132-650](https://comparepv.com/compare/adani-solar-asb-m12-132-640/adani-solar-asb-m12-132-650) - 3 differences, the largest is module efficiency - [Adani Solar ASB-M12-132-640 vs Adani Solar ASB-M12-132-635](https://comparepv.com/compare/adani-solar-asb-m12-132-640/adani-solar-asb-m12-132-635) - The same specification on paper - [Adani Solar ASB-M12-132-640 vs Adani Solar ASB-M12-132-630](https://comparepv.com/compare/adani-solar-asb-m12-132-640/adani-solar-asb-m12-132-630) - 3 differences, the largest is module efficiency - [Adani Solar ASB-M12-132-640 vs Adani Solar ASM-M12-132-650](https://comparepv.com/compare/adani-solar-asb-m12-132-640/adani-solar-asm-m12-132-650) - 5 differences, the largest is module efficiency - [Adani Solar ASB-M12-132-640 vs Adani Solar ASM-M12-132-645](https://comparepv.com/compare/adani-solar-asb-m12-132-640/adani-solar-asm-m12-132-645) - 2 differences, the largest is temperature coefficient - [Adani Solar ASB-M12-132-640 vs Adani Solar ASM-M12-132-640](https://comparepv.com/compare/adani-solar-asb-m12-132-640/adani-solar-asm-m12-132-640) - 2 differences, the largest is temperature coefficient --- Source: https://comparepv.com/compare/adani-solar-asb-m12-132-640/adani-solar-asb-m12-132-645 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.