--- title: "Sunpro Power SPDG500-N120M10 vs Sunpro Power SPDG585-N144M10 - Solar Panel Comparison | ComparePV" description: "Compare Sunpro Power SPDG500-N120M10 vs Sunpro Power SPDG585-N144M10 side by side: what actually differs, output when it is hot, thirty-year production, and the full specification." source: "https://comparepv.com/compare/sunpro-spdg500-n120m10/sunpro-spdg585-n144m10" image: "https://comparepv.com/og/compare/panels/sunpro-spdg500-n120m10/sunpro-spdg585-n144m10.png" updated: 2026-09-11 --- # Sunpro Power SPDG500-N120M10 vs Sunpro Power SPDG585-N144M10 SPDG500-N120M10 leads on the differences that matter The largest is rated power: 85 W more power. 9 of 19 comparable parameters are identical. ## The two panels | Attribute | A | B | | --- | --- | --- | | Panel | [Sunpro Power SPDG500-N120M10](https://comparepv.com/panel/sunpro-spdg500-n120m10) | [Sunpro Power SPDG585-N144M10](https://comparepv.com/panel/sunpro-spdg585-n144m10) | | Manufacturer | Sunpro Power | Sunpro Power | | Power | 500 Wp | 585 Wp | | Efficiency | 23.08 % | 22.64 % | | Technology | TOPCon | TOPCon | ## Where they differ Ranked by how much the difference matters, not by datasheet order. | Parameter | SPDG500-N120M10 | SPDG585-N144M10 | Difference | | --- | --- | --- | --- | | Rated power | 500 Wp | 585 Wp | +85 W for SPDG585-N144M10 | | Weight | 26.0 kg | 31.0 kg | -5.0 kg for SPDG500-N120M10 | | Module efficiency | 23.08 % | 22.64 % | +0.44 pp for SPDG500-N120M10 | | Open-circuit voltage | 43.36 V | 51.58 V | 8.22 V apart | | Module area | 2.166 m² | 2.583 m² | 0.417 m² apart | | Power density | 230.8 Wp/m² | 226.5 Wp/m² | +4.4 Wp/m² for SPDG500-N120M10 | | Voltage at max power | 35.94 V | 42.72 V | 6.78 V apart | | Cell count | 120 | 144 | 24 cells apart | | Bifacial | Yes | No | Yes vs No | | Dimensions | 1910x1134x35 mm | 2278x1134x30 mm | 1910x1134x35 mm vs 2278x1134x30 mm | ## Every compared parameter | Parameter | SPDG500-N120M10 | SPDG585-N144M10 | | --- | --- | --- | | Rated power | 500 Wp | 585 Wp | | Module efficiency | 23.08 % | 22.64 % | | Power density | 230.8 Wp/m² | 226.5 Wp/m² | | Open-circuit voltage | 43.36 V | 51.58 V | | Voltage at max power | 35.94 V | 42.72 V | | Short-circuit current | 14.65 A | 14.41 A | | Current at max power | 13.92 A | 13.70 A | | Temperature coefficient | -0.300 %/°C | -0.300 %/°C | | Dimensions | 1910x1134x35 mm | 2278x1134x30 mm | | Module area | 2.166 m² | 2.583 m² | | Weight | 26.0 kg | 31.0 kg | | Weight per kWp | 52.0 kg/kWp | 53.0 kg/kWp | | Product warranty | 25 yrs | 25 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 | 120 | 144 | | Bifacial | Yes | No | ## Thirty-year yield Each panel's own declared degradation curve, at 1,200 kWh/kWp a year Same temp coeff. for both panels (-0.300 %/°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, SPDG500-N120M10:** 16,776 kWh - **Cumulative output, SPDG585-N144M10:** 19,628 kWh - **Gap:** 2,852 kWh ## Output when hot | Condition | Cell temperature | SPDG500-N120M10 | SPDG585-N144M10 | Retained | | --- | --- | --- | --- | --- | | Standard test conditions | 25 °C | 500 W | 585 W | 100.0% of rated power | | Cool, bright day | 40 °C | 478 W | 559 W | 95.5% of rated power | | Typical summer roof | 55 °C | 455 W | 532 W | 91.0% of rated power | | Hot roof | 70 °C | 433 W | 506 W | 86.5% of rated power | ## Against the whole database | Measure | SPDG500-N120M10 | SPDG585-N144M10 | Out of | Note | | --- | --- | --- | --- | --- | | Efficiency | #1,727 | #3,657 | 14,129 | SPDG500-N120M10 leads by 1,930 places | | Power density | #1,694 | #3,557 | 14,129 | SPDG500-N120M10 leads by 1,863 places | | Heat behaviour | #6,152 | #6,152 | 14,129 | Tied - the same position in the database | | Weight | #5,449 | #6,755 | 14,129 | SPDG500-N120M10 leads by 1,306 places | | Warranty | #21 | #21 | 14,129 | Tied - the same position in the database | | Overall | #3,908 | #1,799 | 14,129 | SPDG585-N144M10 leads by 2,109 places | ## Questions ### Which panel is better: Sunpro Power SPDG500-N120M10 or Sunpro Power SPDG585-N144M10? According to our database: **Sunpro Power SPDG500-N120M10** has higher module efficiency (**23.08%** vs **22.64%**). See the full spec comparison and 30-year energy simulation above for a complete picture. ### What is the efficiency of Sunpro Power SPDG500-N120M10 and Sunpro Power SPDG585-N144M10? **Sunpro Power SPDG500-N120M10** has a module efficiency of **23.08%**, while **Sunpro Power SPDG585-N144M10** is **22.64%**. Higher efficiency means more electricity from the same roof area - useful when space is limited. ### What cell technology does Sunpro Power SPDG500-N120M10 use vs Sunpro Power SPDG585-N144M10? **Sunpro Power SPDG500-N120M10** uses **TOPCon** cells; **Sunpro Power SPDG585-N144M10** 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 Sunpro Power SPDG500-N120M10 and Sunpro Power SPDG585-N144M10? **Sunpro Power SPDG500-N120M10** has a **30 years** power warranty; **Sunpro Power SPDG585-N144M10** 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 Sunpro Power SPDG500-N120M10 and Sunpro Power SPDG585-N144M10 bifacial panels? **Sunpro Power SPDG500-N120M10** is bifacial (captures light from both faces); **Sunpro Power SPDG585-N144M10** is monofacial. Bifacial panels work best on ground mounts or raised structures with a light-coloured surface underneath. ## Related comparisons - [Sunpro Power SPDG500-N120M10 vs Sunpro Power SPDG600-N144M10](https://comparepv.com/compare/sunpro-spdg500-n120m10/sunpro-spdg600-n144m10) - 7 differences, the largest is rated power - [Sunpro Power SPDG500-N120M10 vs Sunpro Power SPDG595-N144M10](https://comparepv.com/compare/sunpro-spdg500-n120m10/sunpro-spdg595-n144m10) - 7 differences, the largest is rated power - [Sunpro Power SPDG500-N120M10 vs Sunpro Power SPDG590-N144M10](https://comparepv.com/compare/sunpro-spdg500-n120m10/sunpro-spdg590-n144m10) - 8 differences, the largest is rated power - [Sunpro Power SPDG500-N120M10 vs Sunpro Power SPDG495-N120M10](https://comparepv.com/compare/sunpro-spdg500-n120m10/sunpro-spdg495-n120m10) - One difference: module efficiency - [Sunpro Power SPDG500-N120M10 vs Sunpro Power SPDG490-N120M10](https://comparepv.com/compare/sunpro-spdg500-n120m10/sunpro-spdg490-n120m10) - 4 differences, the largest is module efficiency - [Sunpro Power SPDG500-N120M10 vs Sunpro Power SPDG485-N120M10](https://comparepv.com/compare/sunpro-spdg500-n120m10/sunpro-spdg485-n120m10) - 4 differences, the largest is module efficiency --- Source: https://comparepv.com/compare/sunpro-spdg500-n120m10/sunpro-spdg585-n144m10 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.