Silfab SIL-640 XL vs Silfab SIL-370 NT mono PERC
VS
The verdict
640 XL leads on the differences that matter
The largest is module efficiency: 4.22 pp more efficient. 3 of 19 comparable parameters are identical.
See all 16 differencesHow alike are they
3
of 19 comparable
parameters are identical
parameters are identical
identical
differs
01
16 of 19 parameters
What actually differs
Parameter
640 XL
370 NT mono PERC
Difference
Module efficiency
22.92 %
18.70 %
4.22 pp more efficient
Temperature coefficient
-0.290 %/°C
-0.380 %/°C
0.090 %/°C better in heat
Rated power
640 Wp
370 Wp
270 W more power
Power density
229.2 Wp/m²
186.9 Wp/m²
42.3 Wp/m² higher
Annual degradation
0.30 %/yr
0.50 %/yr
0.20 %/yr slower
Weight
29.5 kg
21.5 kg
8.0 kg lighter
Weight per kWp
46.1 kg/kWp
58.1 kg/kWp
12.0 kg/kWp lighter
Open-circuit voltage
57.76 V
47.50 V
10.26 V apart
Short-circuit current
13.76 A
9.90 A
3.86 A apart
Module area
2.793 m²
1.980 m²
0.813 m² apart
Cell technology
N-type
PERC
N-type vs PERC
Voltage at max power
48.78 V
38.10 V
10.68 V apart
Current at max power
13.12 A
9.70 A
3.42 A apart
Cell count
156
72
84 cells apart
Bifacial
Yes
No
Yes vs No
Dimensions
2465x1133x35 mm
1992x994x38 mm
2465x1133x35 mm vs 1992x994x38 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
640 XL
21,577 kWh
370 NT mono PERC
11,968 kWh
Lifetime gap
9,609 kWh
Output when it is hot
Rated power carried across the range a module actually sees
Scenario
640 XL
370 NT mono PERC
Standard test conditions
25 °C
100.0% of rated power
640 W
370 W
Cool, bright day
40 °C
94.3% of rated power
612 W
349 W
Typical summer roof
55 °C
88.6% of rated power
584 W
328 W
Hot roof
70 °C
82.9% of rated power
556 W
307 W
03
Full specification
Parameter
640 XL
370 NT mono PERC
Difference
Power and efficiency
Rated power
640 Wp
370 Wp
+270 W for 640 XL
Module efficiency
22.92 %
18.70 %
+4.22 pp for 640 XL
Power density
229.2 Wp/m²
186.9 Wp/m²
+42.3 Wp/m² for 640 XL
Open-circuit voltage
57.76 V
47.50 V
10.26 V apart
Voltage at max power
48.78 V
38.10 V
10.68 V apart
Short-circuit current
13.76 A
9.90 A
3.86 A apart
Current at max power
13.12 A
9.70 A
3.42 A apart
Temperature
Temperature coefficient
-0.290 %/°C
-0.380 %/°C
+0.090 %/°C for 640 XL
Mechanical
Dimensions
2465x1133x35 mm
1992x994x38 mm
2465x1133x35 mm vs 1992x994x38 mm
Module area
2.793 m²
1.980 m²
0.813 m² apart
Weight
29.5 kg
21.5 kg
-8.0 kg for 370 NT mono PERC
Weight per kWp
46.1 kg/kWp
58.1 kg/kWp
-12.0 kg/kWp for 640 XL
Warranty and degradation
Product warranty
25 yrs
25 yrs
Same
Performance warranty
30 yrs
30 yrs
Same
Annual degradation
0.30 %/yr
0.50 %/yr
-0.20 %/yr for 640 XL
Technology
Cell technology
N-type
PERC
N-type vs PERC
Cell type
Monocrystalline
Monocrystalline
Same
Cell count
156
72
84 cells apart
Bifacial
Yes
No
Yes vs No
04
14,005 panels
Against the whole database
Efficiency
#2,350
vs
#13,058
640 XL leads by 10,708 places
Power density
#2,379
vs
#13,048
640 XL leads by 10,669 places
Heat behaviour
#2,165
vs
#13,397
640 XL leads by 11,232 places
Weight
#1,004
vs
#11,565
640 XL leads by 10,561 places
Warranty
#21
vs
#21
Tied - the same position in the database
Overall
#650
vs
#11,845
640 XL leads by 11,195 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-640 XL or Silfab SIL-370 NT mono PERC?
According to our database: Silfab SIL-640 XL has higher module efficiency (22.92% vs 18.70%); Silfab SIL-640 XL tolerates heat better (temp coeff -0.290%/°C vs -0.380%/°C). See the full spec comparison and 30-year energy simulation above for a complete picture.
What is the efficiency of Silfab SIL-640 XL and Silfab SIL-370 NT mono PERC?
Silfab SIL-640 XL has a module efficiency of 22.92%, while Silfab SIL-370 NT mono PERC is 18.70%. Higher efficiency means more electricity from the same roof area - useful when space is limited.
What cell technology does Silfab SIL-640 XL use vs Silfab SIL-370 NT mono PERC?
Silfab SIL-640 XL uses N-type cells; Silfab SIL-370 NT mono PERC uses PERC. 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-640 XL and Silfab SIL-370 NT mono PERC?
Silfab SIL-640 XL has a 30 years power warranty; Silfab SIL-370 NT mono PERC 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-640 XL and Silfab SIL-370 NT mono PERC bifacial panels?
Silfab SIL-640 XL is bifacial (captures light from both faces); Silfab SIL-370 NT mono PERC 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.