Q-Cells Q.PEAK DUO RSF XL-G11S.3 / BFG 590 vs Q-Cells Q.PEAK DUO RSF XL-G11S.3 / BFG 585
VS
The verdict
Identical on every published parameter
All 18 comparable parameters agree, with 1 more left out because at least one datasheet does not publish it. Two records this alike are usually one panel sold under two names, or two bins of the same production line - decide on price and on who you would rather buy from.
How alike are they
18
of 18 comparable
parameters are identical
parameters are identical
identical
differs
not published
01
0 of 18 parameters
What actually differs
Every comparable parameter agrees. The full specification is below.
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.
590
19,429 kWh
585
19,265 kWh
Lifetime gap
164 kWh
Output when it is hot
Rated power carried across the range a module actually sees
Scenario
590
585
Standard test conditions
25 °C
100.0% of rated power
590 W
585 W
Cool, bright day
40 °C
94.9% of rated power
560 W
555 W
Typical summer roof
55 °C
89.8% of rated power
530 W
525 W
Hot roof
70 °C
84.7% of rated power
500 W
495 W
03
Full specification
Parameter
590
585
Difference
Power and efficiency
Rated power
590 Wp
585 Wp
Effectively the same
Module efficiency
21.10 %
21.00 %
Effectively the same
Power density
211.3 Wp/m²
209.5 Wp/m²
Effectively the same
Open-circuit voltage
53.60 V
53.57 V
Effectively the same
Voltage at max power
44.96 V
44.75 V
Effectively the same
Short-circuit current
13.74 A
13.72 A
Effectively the same
Current at max power
13.12 A
13.07 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
36.4 kg
36.4 kg
Same
Weight per kWp
61.7 kg/kWp
62.2 kg/kWp
Effectively the same
Warranty and degradation
Product warranty
-
-
Neither datasheet publishes this
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
#9,297
vs
#9,758
590 leads by 461 places
Power density
#9,241
vs
#9,941
590 leads by 700 places
Heat behaviour
#8,778
vs
#8,778
Tied - the same position in the database
Weight
#12,677
vs
#12,754
590 leads by 77 places
Warranty
#21
vs
#21
Tied - the same position in the database
Overall
#8,523
vs
#8,794
590 leads by 271 places
05
Open the full database
More useful comparisons
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Q-Cells Q.PEAK DUO RSF XL-G11S.3 / BFG 590 vs Q-Cells Q.PEAK DUO RSF XL-G11S.3 / BFG 600
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12 differences, the largest is rated power
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11 differences, the largest is rated power
Same manufacturer
Q-Cells Q.PEAK DUO RSF XL-G11S.3 / BFG 590 vs Q-Cells Q.PEAK DUO ML-G12S.3 / BFG 660
10 differences, the largest is rated power
06
Written summary
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07
Questions about this pairing
Which panel is better: Q-Cells Q.PEAK DUO RSF XL-G11S.3 / BFG 590 or Q-Cells Q.PEAK DUO RSF XL-G11S.3 / BFG 585?
According to our database: Q-Cells Q.PEAK DUO RSF XL-G11S.3 / BFG 590 has higher module efficiency (21.10% vs 21.00%). 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 RSF XL-G11S.3 / BFG 590 and Q-Cells Q.PEAK DUO RSF XL-G11S.3 / BFG 585?
Q-Cells Q.PEAK DUO RSF XL-G11S.3 / BFG 590 has a module efficiency of 21.10%, while Q-Cells Q.PEAK DUO RSF XL-G11S.3 / BFG 585 is 21.00%. Higher efficiency means more electricity from the same roof area - useful when space is limited.
What cell technology does Q-Cells Q.PEAK DUO RSF XL-G11S.3 / BFG 590 use vs Q-Cells Q.PEAK DUO RSF XL-G11S.3 / BFG 585?
Q-Cells Q.PEAK DUO RSF XL-G11S.3 / BFG 590 uses PERC cells; Q-Cells Q.PEAK DUO RSF XL-G11S.3 / BFG 585 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 RSF XL-G11S.3 / BFG 590 and Q-Cells Q.PEAK DUO RSF XL-G11S.3 / BFG 585?
Q-Cells Q.PEAK DUO RSF XL-G11S.3 / BFG 590 has a 30 years power warranty; Q-Cells Q.PEAK DUO RSF XL-G11S.3 / BFG 585 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 RSF XL-G11S.3 / BFG 590 and Q-Cells Q.PEAK DUO RSF XL-G11S.3 / BFG 585 bifacial panels?
Both Q-Cells Q.PEAK DUO RSF XL-G11S.3 / BFG 590 and Q-Cells Q.PEAK DUO RSF XL-G11S.3 / BFG 585 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.