Skip to main content
570 XM+ vs 520 QM 9 of 19 identical Swap Change panels

Silfab SIL-570 XM+ vs Silfab SIL-520 QM

Silfab SIL-570 XM+
Silfab
SIL-570 XM+
570 Wp 22.10 % N-type Bifacial
Open panel page Datasheet PDF
VS
Silfab SIL-520 QM
Silfab
SIL-520 QM
520 Wp 21.90 % N-type
Open panel page Datasheet PDF
The verdict

570 XM+ leads on the differences that matter

The largest is rated power: 50 W more power. 9 of 19 comparable parameters are identical.

See all 10 differences
How alike are they
9 of 19 comparable
parameters are identical
identical differs
01

What actually differs

10 of 19 parameters
Parameter 570 XM+ 520 QM Difference
Rated power 570 Wp 520 Wp 50 W more power
Open-circuit voltage 52.03 V 47.52 V 4.51 V apart
Module area 2.581 m² 2.377 m² 0.204 m² apart
Weight 28.5 kg 26.2 kg 2.3 kg lighter
Module efficiency 22.10 % 21.90 % 0.20 pp more efficient
Cell count 144 132 12 cells apart
Annual degradation 0.30 %/yr 0.35 %/yr 0.05 %/yr slower
Voltage at max power 43.74 V 40.48 V 3.26 V apart
Bifacial Yes No Yes vs No
Dimensions 2278x1133x35 mm 2098x1133x35 mm 2278x1133x35 mm vs 2098x1133x35 mm
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.
570 XM+
19,217 kWh
520 QM
17,396 kWh
Lifetime gap
1,821 kWh
Output when it is hot
Rated power carried across the range a module actually sees
Scenario 570 XM+ 520 QM
Standard test conditions 25 °C 100.0% of rated power 570 W 520 W
Cool, bright day 40 °C 95.7% of rated power 545 W 497 W
Typical summer roof 55 °C 91.3% of rated power 520 W 475 W
Hot roof 70 °C 87.0% of rated power 496 W 452 W
03

Full specification

Parameter 570 XM+ 520 QM Difference
Power and efficiency
Rated power 570 Wp 520 Wp +50 W for 570 XM+
Module efficiency 22.10 % 21.90 % +0.20 pp for 570 XM+
Power density 220.8 Wp/m² 218.8 Wp/m² Effectively the same
Open-circuit voltage 52.03 V 47.52 V 4.51 V apart
Voltage at max power 43.74 V 40.48 V 3.26 V apart
Short-circuit current 13.79 A 13.65 A Effectively the same
Current at max power 13.03 A 12.85 A Effectively the same
Temperature
Temperature coefficient -0.290 %/°C -0.290 %/°C Same
Mechanical
Dimensions 2278x1133x35 mm 2098x1133x35 mm 2278x1133x35 mm vs 2098x1133x35 mm
Module area 2.581 m² 2.377 m² 0.204 m² apart
Weight 28.5 kg 26.2 kg -2.3 kg for 520 QM
Weight per kWp 50.0 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 0.35 %/yr -0.05 %/yr for 570 XM+
Technology
Cell technology N-type N-type Same
Cell type Monocrystalline Monocrystalline Same
Cell count 144 132 12 cells apart
Bifacial Yes No Yes vs No
04

Against the whole database

14,005 panels
Efficiency
#6,012 vs #6,783
570 XM+ leads by 771 places
Power density
#6,015 vs #6,837
570 XM+ leads by 822 places
Heat behaviour
#2,165 vs #2,165
Tied - the same position in the database
Weight
#3,575 vs #3,761
570 XM+ leads by 186 places
Warranty
#21 vs #21
Tied - the same position in the database
Overall
#2,566 vs #4,485
570 XM+ leads by 1,919 places
05

More useful comparisons

Open the full database
Same series, other bin
Silfab
Silfab SIL-570 XM+ vs Silfab SIL-590 XM+
4 differences, the largest is module efficiency
Same series, other bin
Silfab
Silfab SIL-570 XM+ vs Silfab SIL-580-XM+-BIFACIAL
3 differences, the largest is module efficiency
Same series, other bin
Silfab
Silfab SIL-570 XM+ vs Silfab SIL-570 XM+ BIFACIAL
The same specification on paper
Same series, other bin
Silfab
Silfab SIL-570 XM+ vs Silfab SIL-530 XM
8 differences, the largest is rated power
Same series, other bin
Silfab
Silfab SIL-570 XM+ vs Silfab SIL-520 XM
9 differences, the largest is rated power
Same manufacturer
Silfab
Silfab SIL-570 XM+ vs Silfab SIL-640 XL
10 differences, the largest is module efficiency
06

Written summary

07

Questions about this pairing

Which panel is better: Silfab SIL-570 XM+ or Silfab SIL-520 QM?
According to our database: Silfab SIL-570 XM+ has higher module efficiency (22.10% 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-570 XM+ and Silfab SIL-520 QM?
Silfab SIL-570 XM+ has a module efficiency of 22.10%, while Silfab SIL-520 QM is 21.90%. Higher efficiency means more electricity from the same roof area - useful when space is limited.
What cell technology does Silfab SIL-570 XM+ use vs Silfab SIL-520 QM?
Silfab SIL-570 XM+ uses N-type cells; Silfab SIL-520 QM 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-570 XM+ and Silfab SIL-520 QM?
Silfab SIL-570 XM+ has a 30 years power warranty; Silfab SIL-520 QM 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-570 XM+ and Silfab SIL-520 QM bifacial panels?
Silfab SIL-570 XM+ is bifacial (captures light from both faces); Silfab SIL-520 QM is monofacial. Bifacial panels work best on ground mounts or raised structures with a light-coloured surface underneath.

Shop prices: See 2 Silfab offers

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.