Q-Cells Q.PEAK DUO XL-G11S.3 / BFG 595 vs Q-Cells Q.PEAK DUO RSF XL-G11S.3 / BFG 590
VS
The verdict
XL-G11S.3 / BFG 595 leads on the differences that matter
The largest is module efficiency: 0.20 pp more efficient. 15 of 18 comparable parameters are identical, with 1 more left out because at least one datasheet does not publish it.
See all 3 differencesHow alike are they
15
of 18 comparable
parameters are identical
parameters are identical
identical
differs
not published
01
3 of 18 parameters
What actually differs
Parameter
XL-G11S.3 / BFG 595
RSF XL-G11S.3 / BFG 590
Difference
Module efficiency
21.30 %
21.10 %
0.20 pp more efficient
Weight per kWp
58.7 kg/kWp
61.7 kg/kWp
3.0 kg/kWp lighter
Weight
34.9 kg
36.4 kg
1.5 kg lighter
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 (-0.340 %/°C), so a warmer roof scales both curves by the same factor: the totals fall together and neither panel gains on the other.
XL-G11S.3 / BFG 595
19,594 kWh
RSF XL-G11S.3 / BFG 590
19,429 kWh
Lifetime gap
165 kWh
Output when it is hot
Rated power carried across the range a module actually sees
Scenario
XL-G11S.3 / BFG 595
RSF XL-G11S.3 / BFG 590
Standard test conditions
25 °C
100.0% of rated power
595 W
590 W
Cool, bright day
40 °C
94.9% of rated power
565 W
560 W
Typical summer roof
55 °C
89.8% of rated power
534 W
530 W
Hot roof
70 °C
84.7% of rated power
504 W
500 W
03
Full specification
Parameter
XL-G11S.3 / BFG 595
RSF XL-G11S.3 / BFG 590
Difference
Power and efficiency
Rated power
595 Wp
590 Wp
Effectively the same
Module efficiency
21.30 %
21.10 %
+0.20 pp for XL-G11S.3 / BFG 595
Power density
213.1 Wp/m²
211.3 Wp/m²
Effectively the same
Open-circuit voltage
53.63 V
53.60 V
Effectively the same
Voltage at max power
45.18 V
44.96 V
Effectively the same
Short-circuit current
13.77 A
13.74 A
Effectively the same
Current at max power
13.17 A
13.12 A
Effectively the same
Temperature
Temperature coefficient
-0.340 %/°C
-0.340 %/°C
Same
Mechanical
Dimensions
2462x1134x35 mm
2462x1134x35 mm
Same
Module area
2.792 m²
2.792 m²
Same
Weight
34.9 kg
36.4 kg
-1.5 kg for XL-G11S.3 / BFG 595
Weight per kWp
58.7 kg/kWp
61.7 kg/kWp
-3.0 kg/kWp for XL-G11S.3 / BFG 595
Warranty and degradation
Product warranty
12 yrs
-
Not published by Q-Cells
Performance warranty
30 yrs
30 yrs
Same
Annual degradation
0.45 %/yr
0.45 %/yr
Same
Technology
Cell technology
PERC
PERC
Same
Cell type
Monocrystalline
Monocrystalline
Same
Cell count
156
156
Same
Bifacial
Yes
Yes
Same
04
14,005 panels
Against the whole database
Efficiency
#8,519
vs
#9,297
XL-G11S.3 / BFG 595 leads by 778 places
Power density
#8,470
vs
#9,241
XL-G11S.3 / BFG 595 leads by 771 places
Heat behaviour
#8,778
vs
#8,778
Tied - the same position in the database
Weight
#11,828
vs
#12,677
XL-G11S.3 / BFG 595 leads by 849 places
Warranty
#21
vs
#21
Tied - the same position in the database
Overall
#5,375
vs
#8,523
XL-G11S.3 / BFG 595 leads by 3,148 places
05
Open the full database
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One difference: module efficiency
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06
Written summary
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07
Questions about this pairing
Which panel is better: Q-Cells Q.PEAK DUO XL-G11S.3 / BFG 595 or Q-Cells Q.PEAK DUO RSF XL-G11S.3 / BFG 590?
According to our database: Q-Cells Q.PEAK DUO XL-G11S.3 / BFG 595 has higher module efficiency (21.30% vs 21.10%). See the full spec comparison and 30-year energy simulation above for a complete picture.
What is the efficiency of Q-Cells Q.PEAK DUO XL-G11S.3 / BFG 595 and Q-Cells Q.PEAK DUO RSF XL-G11S.3 / BFG 590?
Q-Cells Q.PEAK DUO XL-G11S.3 / BFG 595 has a module efficiency of 21.30%, while Q-Cells Q.PEAK DUO RSF XL-G11S.3 / BFG 590 is 21.10%. Higher efficiency means more electricity from the same roof area - useful when space is limited.
What cell technology does Q-Cells Q.PEAK DUO XL-G11S.3 / BFG 595 use vs Q-Cells Q.PEAK DUO RSF XL-G11S.3 / BFG 590?
Q-Cells Q.PEAK DUO XL-G11S.3 / BFG 595 uses PERC cells; Q-Cells Q.PEAK DUO RSF XL-G11S.3 / BFG 590 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 Q-Cells Q.PEAK DUO XL-G11S.3 / BFG 595 and Q-Cells Q.PEAK DUO RSF XL-G11S.3 / BFG 590?
Q-Cells Q.PEAK DUO XL-G11S.3 / BFG 595 has a 30 years power warranty; Q-Cells Q.PEAK DUO RSF XL-G11S.3 / BFG 590 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 Q-Cells Q.PEAK DUO XL-G11S.3 / BFG 595 and Q-Cells Q.PEAK DUO RSF XL-G11S.3 / BFG 590 bifacial panels?
Both Q-Cells Q.PEAK DUO XL-G11S.3 / BFG 595 and Q-Cells Q.PEAK DUO RSF XL-G11S.3 / BFG 590 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.