--- title: "Emmvee E450HCM120-B vs Emmvee E490HCM132-B - Solar Panel Comparison | ComparePV" description: "Compare Emmvee E450HCM120-B vs Emmvee E490HCM132-B side by side: what actually differs, output when it is hot, thirty-year production, and the full specification." source: "https://comparepv.com/compare/emmvee-e450hcm120-b/emmvee-e490hcm132-b" image: "https://comparepv.com/og/compare/panels/emmvee-e450hcm120-b/emmvee-e490hcm132-b.png" updated: 2026-09-11 --- # Emmvee E450HCM120-B vs Emmvee E490HCM132-B E490HCM132-B leads on the differences that matter The largest is rated power: 40 W more power. 9 of 19 comparable parameters are identical. ## The two panels | Attribute | A | B | | --- | --- | --- | | Panel | [Emmvee E450HCM120-B](https://comparepv.com/panel/emmvee-e450hcm120-b) | [Emmvee E490HCM132-B](https://comparepv.com/panel/emmvee-e490hcm132-b) | | Manufacturer | Emmvee | Emmvee | | Power | 450 Wp | 490 Wp | | Efficiency | 20.74 % | 20.61 % | | Technology | PERC | PERC | ## Where they differ Ranked by how much the difference matters, not by datasheet order. | Parameter | E450HCM120-B | E490HCM132-B | Difference | | --- | --- | --- | --- | | Rated power | 450 Wp | 490 Wp | +40 W for E490HCM132-B | | Module area | 2.169 m² | 2.378 m² | 0.209 m² apart | | Open-circuit voltage | 41.56 V | 44.65 V | 3.09 V apart | | Voltage at max power | 34.31 V | 38.94 V | 4.63 V apart | | Cell count | 120 | 132 | 12 cells apart | | Weight per kWp | 53.3 kg/kWp | 51.0 kg/kWp | -2.3 kg/kWp for E490HCM132-B | | Weight | 24.0 kg | 25.0 kg | -1.0 kg for E450HCM120-B | | Short-circuit current | 13.81 A | 13.09 A | 0.72 A apart | | Dimensions | 1913x1134x35 mm | 2097x1134x35 mm | 1913x1134x35 mm vs 2097x1134x35 mm | | Current at max power | 13.12 A | 12.59 A | 0.53 A apart | ## Every compared parameter | Parameter | E450HCM120-B | E490HCM132-B | | --- | --- | --- | | Rated power | 450 Wp | 490 Wp | | Module efficiency | 20.74 % | 20.61 % | | Power density | 207.4 Wp/m² | 206.1 Wp/m² | | Open-circuit voltage | 41.56 V | 44.65 V | | Voltage at max power | 34.31 V | 38.94 V | | Short-circuit current | 13.81 A | 13.09 A | | Current at max power | 13.12 A | 12.59 A | | Temperature coefficient | -0.350 %/°C | -0.350 %/°C | | Dimensions | 1913x1134x35 mm | 2097x1134x35 mm | | Module area | 2.169 m² | 2.378 m² | | Weight | 24.0 kg | 25.0 kg | | Weight per kWp | 53.3 kg/kWp | 51.0 kg/kWp | | Product warranty | 12 yrs | 12 yrs | | Performance warranty | 25 yrs | 25 yrs | | Annual degradation | 0.55 %/yr | 0.55 %/yr | | Cell technology | PERC | PERC | | Cell type | Monocrystalline | Monocrystalline | | Cell count | 120 | 132 | | Bifacial | No | No | ## 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, E450HCM120-B:** 14,584 kWh - **Cumulative output, E490HCM132-B:** 15,880 kWh - **Gap:** 1,296 kWh ## Output when hot | Condition | Cell temperature | E450HCM120-B | E490HCM132-B | Retained | | --- | --- | --- | --- | --- | | Standard test conditions | 25 °C | 450 W | 490 W | 100.0% of rated power | | Cool, bright day | 40 °C | 426 W | 464 W | 94.8% of rated power | | Typical summer roof | 55 °C | 403 W | 439 W | 89.5% of rated power | | Hot roof | 70 °C | 379 W | 413 W | 84.2% of rated power | ## Against the whole database | Measure | E450HCM120-B | E490HCM132-B | Out of | Note | | --- | --- | --- | --- | --- | | Efficiency | #10,723 | #11,161 | 14,129 | E450HCM120-B leads by 438 places | | Power density | #10,697 | #11,177 | 14,129 | E450HCM120-B leads by 480 places | | Heat behaviour | #10,489 | #10,489 | 14,129 | Tied - the same position in the database | | Weight | #7,243 | #4,383 | 14,129 | E490HCM132-B leads by 2,860 places | | Warranty | #9,912 | #9,912 | 14,129 | Tied - the same position in the database | | Overall | #11,184 | #10,460 | 14,129 | E490HCM132-B leads by 724 places | ## Questions ### Which panel is better: Emmvee E450HCM120-B or Emmvee E490HCM132-B? According to our database: **Emmvee E450HCM120-B** has higher module efficiency (**20.74%** vs **20.61%**). See the full spec comparison and 30-year energy simulation above for a complete picture. ### What is the efficiency of Emmvee E450HCM120-B and Emmvee E490HCM132-B? **Emmvee E450HCM120-B** has a module efficiency of **20.74%**, while **Emmvee E490HCM132-B** is **20.61%**. Higher efficiency means more electricity from the same roof area - useful when space is limited. ### What cell technology does Emmvee E450HCM120-B use vs Emmvee E490HCM132-B? **Emmvee E450HCM120-B** uses **PERC** cells; **Emmvee E490HCM132-B** 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 Emmvee E450HCM120-B and Emmvee E490HCM132-B? **Emmvee E450HCM120-B** has a **25 years** power warranty; **Emmvee E490HCM132-B** has a **25 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. ## Related comparisons - [Emmvee E450HCM120-B vs Emmvee E540HCM144-B](https://comparepv.com/compare/emmvee-e450hcm120-b/emmvee-e540hcm144-b) - 8 differences, the largest is rated power - [Emmvee E450HCM120-B vs Emmvee E535HCM144-B](https://comparepv.com/compare/emmvee-e450hcm120-b/emmvee-e535hcm144-b) - 8 differences, the largest is rated power - [Emmvee E450HCM120-B vs Emmvee E530HCM144-B](https://comparepv.com/compare/emmvee-e450hcm120-b/emmvee-e530hcm144-b) - 9 differences, the largest is rated power - [Emmvee E450HCM120-B vs Emmvee E500HCM132-B](https://comparepv.com/compare/emmvee-e450hcm120-b/emmvee-e500hcm132-b) - 10 differences, the largest is rated power - [Emmvee E450HCM120-B vs Emmvee E495HCM132-B](https://comparepv.com/compare/emmvee-e450hcm120-b/emmvee-e495hcm132-b) - 9 differences, the largest is rated power - [Emmvee E450HCM120-B vs Emmvee E485HCM132-B](https://comparepv.com/compare/emmvee-e450hcm120-b/emmvee-e485hcm132-b) - 11 differences, the largest is rated power --- Source: https://comparepv.com/compare/emmvee-e450hcm120-b/emmvee-e490hcm132-b 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.