Silfab SIL-640 XL vs Silfab SIL-590 XM+
VS
The verdict
640 XL leads on the differences that matter
The largest is rated power: 50 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
640 XL
590 XM+
Difference
Rated power
640 Wp
590 Wp
50 W more power
Open-circuit voltage
57.76 V
52.50 V
5.26 V apart
Module area
2.793 m²
2.581 m²
0.212 m² apart
Cell count
156
144
12 cells apart
Voltage at max power
48.78 V
44.79 V
3.99 V apart
Weight per kWp
46.1 kg/kWp
48.3 kg/kWp
2.2 kg/kWp lighter
Weight
29.5 kg
28.5 kg
1.0 kg lighter
Dimensions
2465x1133x35 mm
2278x1133x35 mm
2465x1133x35 mm vs 2278x1133x35 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.
640 XL
21,577 kWh
590 XM+
19,830 kWh
Lifetime gap
1,747 kWh
Output when it is hot
Rated power carried across the range a module actually sees
Scenario
640 XL
590 XM+
Standard test conditions
25 °C
100.0% of rated power
640 W
590 W
Cool, bright day
40 °C
95.7% of rated power
612 W
564 W
Typical summer roof
55 °C
91.3% of rated power
584 W
539 W
Hot roof
70 °C
87.0% of rated power
556 W
513 W
03
Full specification
Parameter
640 XL
590 XM+
Difference
Power and efficiency
Rated power
640 Wp
590 Wp
+50 W for 640 XL
Module efficiency
22.92 %
22.80 %
Effectively the same
Power density
229.2 Wp/m²
228.6 Wp/m²
Effectively the same
Open-circuit voltage
57.76 V
52.50 V
5.26 V apart
Voltage at max power
48.78 V
44.79 V
3.99 V apart
Short-circuit current
13.76 A
13.91 A
Effectively the same
Current at max power
13.12 A
13.17 A
Effectively the same
Temperature
Temperature coefficient
-0.290 %/°C
-0.290 %/°C
Same
Mechanical
Dimensions
2465x1133x35 mm
2278x1133x35 mm
2465x1133x35 mm vs 2278x1133x35 mm
Module area
2.793 m²
2.581 m²
0.212 m² apart
Weight
29.5 kg
28.5 kg
-1.0 kg for 590 XM+
Weight per kWp
46.1 kg/kWp
48.3 kg/kWp
-2.2 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
0.32 %/yr
Effectively the same
Technology
Cell technology
N-type
N-type
Same
Cell type
Monocrystalline
Monocrystalline
Same
Cell count
156
144
12 cells apart
Bifacial
Yes
Yes
Same
04
14,005 panels
Against the whole database
Efficiency
#2,350
vs
#2,714
640 XL leads by 364 places
Power density
#2,379
vs
#2,463
640 XL leads by 84 places
Heat behaviour
#2,165
vs
#2,165
Tied - the same position in the database
Weight
#1,004
vs
#2,190
640 XL leads by 1,186 places
Warranty
#21
vs
#21
Tied - the same position in the database
Overall
#650
vs
#1,554
640 XL leads by 904 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-590 XM+?
According to our database: Silfab SIL-640 XL has higher module efficiency (22.92% vs 22.80%). 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-590 XM+?
Silfab SIL-640 XL has a module efficiency of 22.92%, while Silfab SIL-590 XM+ is 22.80%. 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-590 XM+?
Silfab SIL-640 XL uses N-type cells; Silfab SIL-590 XM+ 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-640 XL and Silfab SIL-590 XM+?
Silfab SIL-640 XL has a 30 years power warranty; Silfab SIL-590 XM+ 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-590 XM+ bifacial panels?
Both Silfab SIL-640 XL and Silfab SIL-590 XM+ 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.