--- title: "Silfab SIL-520 XM BIFACIAL vs Silfab SIL-520-XM-BIFACIAL - Solar Panel Comparison | ComparePV" description: "Compare Silfab SIL-520 XM BIFACIAL vs Silfab SIL-520-XM-BIFACIAL side by side: what actually differs, output when it is hot, thirty-year production, and the full specification." source: "https://comparepv.com/compare/silfab-sil-520-xm-bifacial/silfab-sil-520-xm-bifacial-1" updated: 2026-09-11 --- # Silfab SIL-520 XM BIFACIAL vs Silfab SIL-520-XM-BIFACIAL Identical on every published parameter All 18 comparable parameters agree, with 1 more left out because at least one datasheet does not publish it. 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 | [Silfab SIL-520 XM BIFACIAL](https://comparepv.com/panel/silfab-sil-520-xm-bifacial) | [Silfab SIL-520-XM-BIFACIAL](https://comparepv.com/panel/silfab-sil-520-xm-bifacial-1) | | Manufacturer | Silfab | Silfab | | Power | 520 Wp | 520 Wp | | Efficiency | 21.90 % | 21.90 % | | Technology | N-type | N-type | ## Every compared parameter | Parameter | 520 XM BIFACIAL | 520-XM-BIFACIAL | | --- | --- | --- | | Rated power | 520 Wp | 520 Wp | | Module efficiency | 21.90 % | 21.90 % | | Power density | 218.8 Wp/m² | 218.8 Wp/m² | | Open-circuit voltage | 47.52 V | 47.52 V | | Voltage at max power | 40.48 V | 40.48 V | | Short-circuit current | 13.65 A | 13.65 A | | Current at max power | 12.85 A | 12.85 A | | Temperature coefficient | -0.290 %/°C | -0.290 %/°C | | Dimensions | 2098x1133x35 mm | 2098x1133x35 mm | | Module area | 2.377 m² | 2.377 m² | | Weight | 26.2 kg | 26.2 kg | | Weight per kWp | 50.4 kg/kWp | 50.4 kg/kWp | | Product warranty | 25 yrs | 25 yrs | | Performance warranty | 30 yrs | 30 yrs | | Annual degradation | - | 0.30 %/yr | | Cell technology | N-type | N-type | | Cell type | Monocrystalline | Monocrystalline | | Cell count | 132 | 132 | | Bifacial | Yes | Yes | ## Thirty-year yield Declared first-year losses, with 0.40% a year afterwards assumed for both panels, 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, 520 XM BIFACIAL:** 17,260 kWh - **Cumulative output, 520-XM-BIFACIAL:** 17,260 kWh - **Gap:** No difference ## Output when hot | Condition | Cell temperature | 520 XM BIFACIAL | 520-XM-BIFACIAL | Retained | | --- | --- | --- | --- | --- | | Standard test conditions | 25 °C | 520 W | 520 W | 100.0% of rated power | | Cool, bright day | 40 °C | 497 W | 497 W | 95.7% of rated power | | Typical summer roof | 55 °C | 475 W | 475 W | 91.3% of rated power | | Hot roof | 70 °C | 452 W | 452 W | 87.0% of rated power | ## Against the whole database | Measure | 520 XM BIFACIAL | 520-XM-BIFACIAL | Out of | Note | | --- | --- | --- | --- | --- | | Efficiency | #6,783 | #6,783 | 14,005 | Tied - the same position in the database | | Power density | #6,837 | #6,837 | 14,005 | Tied - the same position in the database | | Heat behaviour | #2,165 | #2,165 | 14,005 | Tied - the same position in the database | | Weight | #3,761 | #3,761 | 14,005 | Tied - the same position in the database | | Warranty | #21 | #21 | 14,005 | Tied - the same position in the database | | Overall | #4,485 | #4,485 | 14,005 | Tied - the same position in the database | ## Questions ### Which panel is better: Silfab SIL-520 XM BIFACIAL or Silfab SIL-520-XM-BIFACIAL? According to our database: both panels are closely matched on key specs - the decision often comes down to price and local availability. See the full spec comparison and 30-year energy simulation above for a complete picture. ### What is the efficiency of Silfab SIL-520 XM BIFACIAL and Silfab SIL-520-XM-BIFACIAL? **Silfab SIL-520 XM BIFACIAL** has a module efficiency of **21.90%**, while **Silfab SIL-520-XM-BIFACIAL** is **21.90%**. Higher efficiency means more electricity from the same roof area - useful when space is limited. ### What cell technology does Silfab SIL-520 XM BIFACIAL use vs Silfab SIL-520-XM-BIFACIAL? **Silfab SIL-520 XM BIFACIAL** uses **N-type** cells; **Silfab SIL-520-XM-BIFACIAL** uses **N-type**. 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 Silfab SIL-520 XM BIFACIAL and Silfab SIL-520-XM-BIFACIAL? **Silfab SIL-520 XM BIFACIAL** has a **30 years** power warranty; **Silfab SIL-520-XM-BIFACIAL** 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 Silfab SIL-520 XM BIFACIAL and Silfab SIL-520-XM-BIFACIAL bifacial panels? Both **Silfab SIL-520 XM BIFACIAL** and **Silfab SIL-520-XM-BIFACIAL** 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 - [Silfab SIL-520-XM-BIFACIAL vs Silfab SIL-580-XM+-BIFACIAL](https://comparepv.com/compare/silfab-sil-520-xm-bifacial-1/silfab-sil-580-xm-bifacial) - 9 differences, the largest is rated power - [Silfab SIL-520-XM-BIFACIAL vs Silfab SIL-570 XM+ BIFACIAL](https://comparepv.com/compare/silfab-sil-520-xm-bifacial-1/silfab-sil-570-xm-bifacial) - 8 differences, the largest is rated power - [Silfab SIL-520-XM-BIFACIAL vs Silfab SIL-540-XM-BIFACIAL](https://comparepv.com/compare/silfab-sil-520-xm-bifacial-1/silfab-sil-540-xm-bifacial) - 4 differences, the largest is module efficiency - [Silfab SIL-520 XM BIFACIAL vs Silfab SIL-640 XL](https://comparepv.com/compare/silfab-sil-520-xm-bifacial/silfab-sil-640-xl) - 10 differences, the largest is module efficiency - [Silfab SIL-520 XM BIFACIAL vs Silfab SIL-630 XL](https://comparepv.com/compare/silfab-sil-520-xm-bifacial/silfab-sil-630-xl) - 10 differences, the largest is module efficiency - [Silfab SIL-520 XM BIFACIAL vs Silfab SIL-620 XL](https://comparepv.com/compare/silfab-sil-520-xm-bifacial/silfab-sil-620-xl) - 10 differences, the largest is rated power --- Source: https://comparepv.com/compare/silfab-sil-520-xm-bifacial/silfab-sil-520-xm-bifacial-1 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.