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540-XM-BIFACIAL vs 520-XM-BIFACIAL 15 of 19 identical Swap Change panels

Silfab SIL-540-XM-BIFACIAL vs Silfab SIL-520-XM-BIFACIAL

Silfab
SIL-540-XM-BIFACIAL
540 Wp 22.70 % N-type Bifacial
Open panel page Datasheet PDF
VS
Silfab
SIL-520-XM-BIFACIAL
520 Wp 21.90 % N-type Bifacial
Open panel page Datasheet PDF
The verdict

540-XM-BIFACIAL leads on the differences that matter

The largest is module efficiency: 0.80 pp more efficient. 15 of 19 comparable parameters are identical.

See all 4 differences
How alike are they
15 of 19 comparable
parameters are identical
identical differs
01

What actually differs

4 of 19 parameters
Parameter 540-XM-BIFACIAL 520-XM-BIFACIAL Difference
Module efficiency 22.70 % 21.90 % 0.80 pp more efficient
Power density 227.2 Wp/m² 218.8 Wp/m² 8.4 Wp/m² higher
Rated power 540 Wp 520 Wp 20 W more power
Voltage at max power 41.62 V 40.48 V 1.14 V apart
02

What it means on a roof

Thirty years of production
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.
540-XM-BIFACIAL
18,206 kWh
520-XM-BIFACIAL
17,531 kWh
Lifetime gap
675 kWh
Output when it is hot
Rated power carried across the range a module actually sees
Scenario 540-XM-BIFACIAL 520-XM-BIFACIAL
Standard test conditions 25 °C 100.0% of rated power 540 W 520 W
Cool, bright day 40 °C 95.7% of rated power 517 W 497 W
Typical summer roof 55 °C 91.3% of rated power 493 W 475 W
Hot roof 70 °C 87.0% of rated power 470 W 452 W
03

Full specification

Parameter 540-XM-BIFACIAL 520-XM-BIFACIAL Difference
Power and efficiency
Rated power 540 Wp 520 Wp +20 W for 540-XM-BIFACIAL
Module efficiency 22.70 % 21.90 % +0.80 pp for 540-XM-BIFACIAL
Power density 227.2 Wp/m² 218.8 Wp/m² +8.4 Wp/m² for 540-XM-BIFACIAL
Open-circuit voltage 47.95 V 47.52 V Effectively the same
Voltage at max power 41.62 V 40.48 V 1.14 V apart
Short-circuit current 13.78 A 13.65 A Effectively the same
Current at max power 12.97 A 12.85 A Effectively the same
Temperature
Temperature coefficient -0.290 %/°C -0.290 %/°C Same
Mechanical
Dimensions 2098x1133x35 mm 2098x1133x35 mm Same
Module area 2.377 m² 2.377 m² Same
Weight 26.2 kg 26.2 kg Same
Weight per kWp 48.5 kg/kWp 50.4 kg/kWp Effectively the same
Warranty and degradation
Product warranty 25 yrs 25 yrs Same
Performance warranty 30 yrs 30 yrs Same
Annual degradation 0.30 %/yr 0.30 %/yr Same
Technology
Cell technology N-type N-type Same
Cell type Monocrystalline Monocrystalline Same
Cell count 132 132 Same
Bifacial Yes Yes Same
04

Against the whole database

14,005 panels
Efficiency
#3,307 vs #6,783
540-XM-BIFACIAL leads by 3,476 places
Power density
#3,251 vs #6,837
540-XM-BIFACIAL leads by 3,586 places
Heat behaviour
#2,165 vs #2,165
Tied - the same position in the database
Weight
#2,336 vs #3,761
540-XM-BIFACIAL leads by 1,425 places
Warranty
#21 vs #21
Tied - the same position in the database
Overall
#2,857 vs #4,485
540-XM-BIFACIAL leads by 1,628 places
05

More useful comparisons

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Silfab SIL-540-XM-BIFACIAL vs Silfab SIL-590 XM+
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Silfab SIL-540-XM-BIFACIAL vs Silfab SIL-580-XM+-BIFACIAL
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Silfab SIL-540-XM-BIFACIAL vs Silfab SIL-570 XM+ BIFACIAL
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06

Written summary

07

Questions about this pairing

Which panel is better: Silfab SIL-540-XM-BIFACIAL or Silfab SIL-520-XM-BIFACIAL?
According to our database: Silfab SIL-540-XM-BIFACIAL has higher module efficiency (22.70% vs 21.90%). See the full spec comparison and 30-year energy simulation above for a complete picture.
What is the efficiency of Silfab SIL-540-XM-BIFACIAL and Silfab SIL-520-XM-BIFACIAL?
Silfab SIL-540-XM-BIFACIAL has a module efficiency of 22.70%, 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-540-XM-BIFACIAL use vs Silfab SIL-520-XM-BIFACIAL?
Silfab SIL-540-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-540-XM-BIFACIAL and Silfab SIL-520-XM-BIFACIAL?
Silfab SIL-540-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-540-XM-BIFACIAL and Silfab SIL-520-XM-BIFACIAL bifacial panels?
Both Silfab SIL-540-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.

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Every figure here is from the manufacturers' own datasheets - a dash means the value is not published, never an estimate. The thirty-year projection and the temperature scenarios are calculations from those figures, and each states its assumption above.