Silfab SIL-620 XL vs Silfab SIL-590 XM+
VS
The verdict
590 XM+ leads on the differences that matter
The largest is module efficiency: 0.60 pp more efficient. 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
620 XL
590 XM+
Difference
Module efficiency
22.20 %
22.80 %
0.60 pp more efficient
Rated power
620 Wp
590 Wp
30 W more power
Power density
222.0 Wp/m²
228.6 Wp/m²
6.6 Wp/m² higher
Open-circuit voltage
57.21 V
52.50 V
4.71 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
48.16 V
44.79 V
3.37 V apart
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.
620 XL
20,903 kWh
590 XM+
19,830 kWh
Lifetime gap
1,073 kWh
Output when it is hot
Rated power carried across the range a module actually sees
Scenario
620 XL
590 XM+
Standard test conditions
25 °C
100.0% of rated power
620 W
590 W
Cool, bright day
40 °C
95.7% of rated power
593 W
564 W
Typical summer roof
55 °C
91.3% of rated power
566 W
539 W
Hot roof
70 °C
87.0% of rated power
539 W
513 W
03
Full specification
Parameter
620 XL
590 XM+
Difference
Power and efficiency
Rated power
620 Wp
590 Wp
+30 W for 620 XL
Module efficiency
22.20 %
22.80 %
+0.60 pp for 590 XM+
Power density
222.0 Wp/m²
228.6 Wp/m²
+6.6 Wp/m² for 590 XM+
Open-circuit voltage
57.21 V
52.50 V
4.71 V apart
Voltage at max power
48.16 V
44.79 V
3.37 V apart
Short-circuit current
13.55 A
13.91 A
Effectively the same
Current at max power
12.87 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
47.6 kg/kWp
48.3 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
0.32 %/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
#5,817
vs
#2,714
590 XM+ leads by 3,103 places
Power density
#5,849
vs
#2,463
590 XM+ leads by 3,386 places
Heat behaviour
#2,165
vs
#2,165
Tied - the same position in the database
Weight
#1,761
vs
#2,190
620 XL leads by 429 places
Warranty
#21
vs
#21
Tied - the same position in the database
Overall
#1,404
vs
#1,554
620 XL leads by 150 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-620 XL or Silfab SIL-590 XM+?
According to our database: Silfab SIL-590 XM+ has higher module efficiency (22.80% vs 22.20%). See the full spec comparison and 30-year energy simulation above for a complete picture.
What is the efficiency of Silfab SIL-620 XL and Silfab SIL-590 XM+?
Silfab SIL-620 XL has a module efficiency of 22.20%, 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-620 XL use vs Silfab SIL-590 XM+?
Silfab SIL-620 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-620 XL and Silfab SIL-590 XM+?
Silfab SIL-620 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-620 XL and Silfab SIL-590 XM+ bifacial panels?
Both Silfab SIL-620 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.