Silfab SIL-430-QD vs Silfab SIL-620 XL
VS
The verdict
8 differences, and they point both ways
The largest is rated power: 190 W more power. 11 of 19 comparable parameters are identical.
See all 8 differencesHow alike are they
11
of 19 comparable
parameters are identical
parameters are identical
identical
differs
01
8 of 19 parameters
What actually differs
Parameter
430-QD
620 XL
Difference
Rated power
430 Wp
620 Wp
190 W more power
Weight
21.0 kg
29.5 kg
8.5 kg lighter
Open-circuit voltage
38.91 V
57.21 V
18.30 V apart
Module area
1.950 m²
2.793 m²
0.843 m² apart
Voltage at max power
33.25 V
48.16 V
14.91 V apart
Cell count
108
156
48 cells apart
Bifacial
No
Yes
No vs Yes
Dimensions
1721x1133x35 mm
2465x1133x35 mm
1721x1133x35 mm vs 2465x1133x35 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.
430-QD
14,497 kWh
620 XL
20,903 kWh
Lifetime gap
6,406 kWh
Output when it is hot
Rated power carried across the range a module actually sees
Scenario
430-QD
620 XL
Standard test conditions
25 °C
100.0% of rated power
430 W
620 W
Cool, bright day
40 °C
95.7% of rated power
411 W
593 W
Typical summer roof
55 °C
91.3% of rated power
393 W
566 W
Hot roof
70 °C
87.0% of rated power
374 W
539 W
03
Full specification
Parameter
430-QD
620 XL
Difference
Power and efficiency
Rated power
430 Wp
620 Wp
+190 W for 620 XL
Module efficiency
22.10 %
22.20 %
Effectively the same
Power density
220.5 Wp/m²
222.0 Wp/m²
Effectively the same
Open-circuit voltage
38.91 V
57.21 V
18.30 V apart
Voltage at max power
33.25 V
48.16 V
14.91 V apart
Short-circuit current
13.87 A
13.55 A
Effectively the same
Current at max power
12.93 A
12.87 A
Effectively the same
Temperature
Temperature coefficient
-0.290 %/°C
-0.290 %/°C
Same
Mechanical
Dimensions
1721x1133x35 mm
2465x1133x35 mm
1721x1133x35 mm vs 2465x1133x35 mm
Module area
1.950 m²
2.793 m²
0.843 m² apart
Weight
21.0 kg
29.5 kg
-8.5 kg for 430-QD
Weight per kWp
48.8 kg/kWp
47.6 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
108
156
48 cells apart
Bifacial
No
Yes
No vs Yes
04
14,005 panels
Against the whole database
Efficiency
#6,012
vs
#5,817
620 XL leads by 195 places
Power density
#6,191
vs
#5,849
620 XL leads by 342 places
Heat behaviour
#2,165
vs
#2,165
Tied - the same position in the database
Weight
#2,492
vs
#1,761
620 XL leads by 731 places
Warranty
#21
vs
#21
Tied - the same position in the database
Overall
#7,342
vs
#1,404
620 XL leads by 5,938 places
05
Open the full database
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06
Written summary
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07
Questions about this pairing
Which panel is better: Silfab SIL-430-QD or Silfab SIL-620 XL?
According to our database: Silfab SIL-620 XL has higher module efficiency (22.20% vs 22.10%). See the full spec comparison and 30-year energy simulation above for a complete picture.
What is the efficiency of Silfab SIL-430-QD and Silfab SIL-620 XL?
Silfab SIL-430-QD has a module efficiency of 22.10%, while Silfab SIL-620 XL is 22.20%. Higher efficiency means more electricity from the same roof area - useful when space is limited.
What cell technology does Silfab SIL-430-QD use vs Silfab SIL-620 XL?
Silfab SIL-430-QD uses N-type cells; Silfab SIL-620 XL 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-430-QD and Silfab SIL-620 XL?
Silfab SIL-430-QD has a 30 years power warranty; Silfab SIL-620 XL 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-430-QD and Silfab SIL-620 XL bifacial panels?
Silfab SIL-620 XL is bifacial (captures light from both faces); Silfab SIL-430-QD is monofacial. Bifacial panels work best on ground mounts or raised structures with a light-coloured surface underneath.
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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.