--- title: "Bisol BBO 510 vs Bisol BBO 520 - Solar Panel Comparison | ComparePV" description: "Compare Bisol BBO 510 vs Bisol BBO 520 side by side: what actually differs, output when it is hot, thirty-year production, and the full specification." source: "https://comparepv.com/compare/bisol-bbo-510/bisol-bbo-520" updated: 2026-09-11 --- # Bisol BBO 510 vs Bisol BBO 520 520 leads on the differences that matter The largest is module efficiency: 0.40 pp more efficient. 15 of 19 comparable parameters are identical. ## The two panels | Attribute | A | B | | --- | --- | --- | | Panel | [Bisol BBO 510](https://comparepv.com/panel/bisol-bbo-510) | [Bisol BBO 520](https://comparepv.com/panel/bisol-bbo-520) | | Manufacturer | Bisol | Bisol | | Power | 510 Wp | 520 Wp | | Efficiency | 22.80 % | 23.20 % | | Technology | PERC | TOPCon | ## Where they differ Ranked by how much the difference matters, not by datasheet order. | Parameter | 510 | 520 | Difference | | --- | --- | --- | --- | | Module efficiency | 22.80 % | 23.20 % | +0.40 pp for 520 | | Power density | 227.7 Wp/m² | 232.2 Wp/m² | +4.5 Wp/m² for 520 | | Cell technology | PERC | TOPCon | PERC vs TOPCon | | Rated power | 510 Wp | 520 Wp | +10 W for 520 | ## Every compared parameter | Parameter | 510 | 520 | | --- | --- | --- | | Rated power | 510 Wp | 520 Wp | | Module efficiency | 22.80 % | 23.20 % | | Power density | 227.7 Wp/m² | 232.2 Wp/m² | | Open-circuit voltage | 40.00 V | 40.60 V | | Voltage at max power | 33.60 V | 33.80 V | | Short-circuit current | 16.10 A | 16.20 A | | Current at max power | 15.20 A | 15.40 A | | Temperature coefficient | -0.290 %/°C | -0.290 %/°C | | Dimensions | 1975x1134x35 mm | 1975x1134x35 mm | | Module area | 2.240 m² | 2.240 m² | | Weight | 23.5 kg | 23.5 kg | | Weight per kWp | 46.1 kg/kWp | 45.2 kg/kWp | | Product warranty | 25 yrs | 25 yrs | | Performance warranty | 30 yrs | 30 yrs | | Annual degradation | 0.31 %/yr | 0.31 %/yr | | Cell technology | PERC | TOPCon | | Cell type | Monocrystalline | Monocrystalline | | Cell count | 108 | 108 | | 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 (-0.290 %/°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, 510:** 17,351 kWh - **Cumulative output, 520:** 17,691 kWh - **Gap:** 340 kWh ## Output when hot | Condition | Cell temperature | 510 | 520 | Retained | | --- | --- | --- | --- | --- | | Standard test conditions | 25 °C | 510 W | 520 W | 100.0% of rated power | | Cool, bright day | 40 °C | 488 W | 497 W | 95.7% of rated power | | Typical summer roof | 55 °C | 466 W | 475 W | 91.3% of rated power | | Hot roof | 70 °C | 443 W | 452 W | 87.0% of rated power | ## Against the whole database | Measure | 510 | 520 | Out of | Note | | --- | --- | --- | --- | --- | | Efficiency | #2,714 | #1,306 | 14,005 | 520 leads by 1,408 places | | Power density | #3,074 | #1,328 | 14,005 | 520 leads by 1,746 places | | Heat behaviour | #2,165 | #2,165 | 14,005 | Tied - the same position in the database | | Weight | #979 | #635 | 14,005 | 520 leads by 344 places | | Warranty | #21 | #21 | 14,005 | Tied - the same position in the database | | Overall | #3,687 | #2,878 | 14,005 | 520 leads by 809 places | ## Questions ### Which panel is better: Bisol BBO 510 or Bisol BBO 520? According to our database: **Bisol BBO 520** has higher module efficiency (**23.20%** vs **22.80%**). See the full spec comparison and 30-year energy simulation above for a complete picture. ### What is the efficiency of Bisol BBO 510 and Bisol BBO 520? **Bisol BBO 510** has a module efficiency of **22.80%**, while **Bisol BBO 520** is **23.20%**. Higher efficiency means more electricity from the same roof area - useful when space is limited. ### What cell technology does Bisol BBO 510 use vs Bisol BBO 520? **Bisol BBO 510** uses **PERC** cells; **Bisol BBO 520** 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 Bisol BBO 510 and Bisol BBO 520? **Bisol BBO 510** has a **30 years** power warranty; **Bisol BBO 520** 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. ## Related comparisons - [Bisol BBO 510 vs Bisol BGO 580](https://comparepv.com/compare/bisol-bbo-510/bisol-bgo-580) - 10 differences, the largest is module efficiency - [Bisol BBO 510 vs Bisol BGO 570](https://comparepv.com/compare/bisol-bbo-510/bisol-bgo-570) - 10 differences, the largest is rated power - [Bisol BBO 510 vs Bisol BGO 560](https://comparepv.com/compare/bisol-bbo-510/bisol-bgo-560) - 8 differences, the largest is rated power - [Bisol BBO 510 vs Bisol BBO 500](https://comparepv.com/compare/bisol-bbo-510/bisol-bbo-500) - 3 differences, the largest is module efficiency - [Bisol BBO 510 vs Bisol BDO 460](https://comparepv.com/compare/bisol-bbo-510/bisol-bdo-460) - 9 differences, the largest is rated power - [Bisol BBO 510 vs Bisol BDO 450](https://comparepv.com/compare/bisol-bbo-510/bisol-bdo-450) - 8 differences, the largest is rated power --- Source: https://comparepv.com/compare/bisol-bbo-510/bisol-bbo-520 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.