Silfab SIL-440 QD vs Silfab SIL-630 XL
VS
The verdict
9 differences, and they point both ways
The largest is rated power: 190 W more power. 10 of 19 comparable parameters are identical.
See all 9 differencesHow alike are they
10
of 19 comparable
parameters are identical
parameters are identical
identical
differs
01
9 of 19 parameters
What actually differs
Parameter
440 QD
630 XL
Difference
Rated power
440 Wp
630 Wp
190 W more power
Weight
21.0 kg
29.5 kg
8.5 kg lighter
Open-circuit voltage
38.97 V
57.49 V
18.52 V apart
Module area
1.950 m²
2.793 m²
0.843 m² apart
Voltage at max power
33.41 V
48.47 V
15.06 V apart
Cell count
108
156
48 cells apart
Bifacial
No
Yes
No vs Yes
Short-circuit current
14.22 A
13.66 A
0.56 A apart
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.
440 QD
14,834 kWh
630 XL
21,240 kWh
Lifetime gap
6,406 kWh
Output when it is hot
Rated power carried across the range a module actually sees
Scenario
440 QD
630 XL
Standard test conditions
25 °C
100.0% of rated power
440 W
630 W
Cool, bright day
40 °C
95.7% of rated power
421 W
603 W
Typical summer roof
55 °C
91.3% of rated power
402 W
575 W
Hot roof
70 °C
87.0% of rated power
383 W
548 W
03
Full specification
Parameter
440 QD
630 XL
Difference
Power and efficiency
Rated power
440 Wp
630 Wp
+190 W for 630 XL
Module efficiency
22.60 %
22.56 %
Effectively the same
Power density
225.7 Wp/m²
225.6 Wp/m²
Effectively the same
Open-circuit voltage
38.97 V
57.49 V
18.52 V apart
Voltage at max power
33.41 V
48.47 V
15.06 V apart
Short-circuit current
14.22 A
13.66 A
0.56 A apart
Current at max power
13.17 A
13.00 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 440 QD
Weight per kWp
47.7 kg/kWp
46.8 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
#3,658
vs
#3,899
440 QD leads by 241 places
Power density
#3,848
vs
#3,867
440 QD leads by 19 places
Heat behaviour
#2,165
vs
#2,165
Tied - the same position in the database
Weight
#1,829
vs
#1,365
630 XL leads by 464 places
Warranty
#21
vs
#21
Tied - the same position in the database
Overall
#6,331
vs
#1,032
630 XL leads by 5,299 places
05
Open the full database
More useful comparisons
Same series, other bin
Silfab
Silfab SIL-440 QD vs Silfab SIL-430 QD
3 differences, the largest is module efficiency
Same series, other bin
Silfab
Silfab SIL-440 QD vs Silfab SIL-430-QD
3 differences, the largest is module efficiency
Same series, other bin
Silfab
Silfab SIL-440 QD vs Silfab SIL-420 QD
6 differences, the largest is module efficiency
Same series, other bin
Silfab
Silfab SIL-440 QD vs Silfab SIL-370 NT mono PERC
14 differences, the largest is module efficiency
Same series, other bin
Silfab
Silfab SIL-630 XL vs Silfab SIL-640 XL
3 differences, the largest is module efficiency
Same series, other bin
Silfab
Silfab SIL-630 XL vs Silfab SIL-620 XL
3 differences, the largest is module efficiency
06
Written summary
Checking cache...
07
Questions about this pairing
Which panel is better: Silfab SIL-440 QD or Silfab SIL-630 XL?
According to our database: Silfab SIL-440 QD has higher module efficiency (22.60% vs 22.56%). See the full spec comparison and 30-year energy simulation above for a complete picture.
What is the efficiency of Silfab SIL-440 QD and Silfab SIL-630 XL?
Silfab SIL-440 QD has a module efficiency of 22.60%, while Silfab SIL-630 XL is 22.56%. Higher efficiency means more electricity from the same roof area - useful when space is limited.
What cell technology does Silfab SIL-440 QD use vs Silfab SIL-630 XL?
Silfab SIL-440 QD uses N-type cells; Silfab SIL-630 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-440 QD and Silfab SIL-630 XL?
Silfab SIL-440 QD has a 30 years power warranty; Silfab SIL-630 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-440 QD and Silfab SIL-630 XL bifacial panels?
Silfab SIL-630 XL is bifacial (captures light from both faces); Silfab SIL-440 QD 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.