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XL-G11S.3 / BFG 600 vs RSF XL-G11S.3 / BFG 590 13 of 18 identical Swap Change panels

Q-Cells Q.PEAK DUO XL-G11S.3 / BFG 600 vs Q-Cells Q.PEAK DUO RSF XL-G11S.3 / BFG 590

Q-Cells Q.PEAK DUO XL-G11S.3 / BFG 600
Q.PEAK DUO XL-G11S.3 / BFG 600
600 Wp 21.50 % PERC Bifacial
Open panel page Datasheet PDF
VS
Q-Cells Q.PEAK DUO RSF XL-G11S.3 / BFG 590
Q.PEAK DUO RSF XL-G11S.3 / BFG 590
590 Wp 21.10 % PERC Bifacial
Open panel page Datasheet PDF
The verdict

XL-G11S.3 / BFG 600 leads on the differences that matter

The largest is module efficiency: 0.40 pp more efficient. 13 of 18 comparable parameters are identical, with 1 more left out because at least one datasheet does not publish it.

See all 5 differences
How alike are they
13 of 18 comparable
parameters are identical
identical differs not published
01

What actually differs

5 of 18 parameters
Parameter XL-G11S.3 / BFG 600 RSF XL-G11S.3 / BFG 590 Difference
Module efficiency 21.50 % 21.10 % 0.40 pp more efficient
Weight per kWp 58.2 kg/kWp 61.7 kg/kWp 3.5 kg/kWp lighter
Power density 214.9 Wp/m² 211.3 Wp/m² 3.6 Wp/m² higher
Weight 34.9 kg 36.4 kg 1.5 kg lighter
Rated power 600 Wp 590 Wp 10 W more power
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 600
19,759 kWh
RSF XL-G11S.3 / BFG 590
19,429 kWh
Lifetime gap
330 kWh
Output when it is hot
Rated power carried across the range a module actually sees
Scenario XL-G11S.3 / BFG 600 RSF XL-G11S.3 / BFG 590
Standard test conditions 25 °C 100.0% of rated power 600 W 590 W
Cool, bright day 40 °C 94.9% of rated power 569 W 560 W
Typical summer roof 55 °C 89.8% of rated power 539 W 530 W
Hot roof 70 °C 84.7% of rated power 508 W 500 W
03

Full specification

Parameter XL-G11S.3 / BFG 600 RSF XL-G11S.3 / BFG 590 Difference
Power and efficiency
Rated power 600 Wp 590 Wp +10 W for XL-G11S.3 / BFG 600
Module efficiency 21.50 % 21.10 % +0.40 pp for XL-G11S.3 / BFG 600
Power density 214.9 Wp/m² 211.3 Wp/m² +3.6 Wp/m² for XL-G11S.3 / BFG 600
Open-circuit voltage 53.66 V 53.60 V Effectively the same
Voltage at max power 45.30 V 44.96 V Effectively the same
Short-circuit current 13.80 A 13.74 A Effectively the same
Current at max power 13.25 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 600
Weight per kWp 58.2 kg/kWp 61.7 kg/kWp -3.5 kg/kWp for XL-G11S.3 / BFG 600
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

Against the whole database

14,005 panels
Efficiency
#7,958 vs #9,297
XL-G11S.3 / BFG 600 leads by 1,339 places
Power density
#8,031 vs #9,241
XL-G11S.3 / BFG 600 leads by 1,210 places
Heat behaviour
#8,778 vs #8,778
Tied - the same position in the database
Weight
#11,592 vs #12,677
XL-G11S.3 / BFG 600 leads by 1,085 places
Warranty
#21 vs #21
Tied - the same position in the database
Overall
#4,980 vs #8,523
XL-G11S.3 / BFG 600 leads by 3,543 places
05

More useful comparisons

Open the full database
Same series, other bin
Q-Cells Q.PEAK DUO XL-G11S.3 / BFG 600 vs Q-Cells Q.PEAK DUO XL-G11S.3 / BFG 605
One difference: module efficiency
Same series, other bin
Q-Cells Q.PEAK DUO XL-G11S.3 / BFG 600 vs Q-Cells Q.PEAK DUO RSF XL-G11S.3 / BFG 600
2 differences, the largest is weight
Same series, other bin
Q-Cells Q.PEAK DUO XL-G11S.3 / BFG 600 vs Q-Cells Q.PEAK DUO RSF XL-G11S.3 / BFG 595
3 differences, the largest is module efficiency
Same series, other bin
Q-Cells Q.PEAK DUO XL-G11S.3 / BFG 600 vs Q-Cells Q.PEAK DUO XL-G11S.3 / BFG 595
One difference: module efficiency
Same series, other bin
Q-Cells Q.PEAK DUO XL-G11S.3 / BFG 600 vs Q-Cells Q.PEAK DUO XL-G11S.3 / BFG 590
3 differences, the largest is module efficiency
Same series, other bin
Q-Cells Q.PEAK DUO XL-G11S.3 / BFG 600 vs Q-Cells Q.PEAK DUO RSF XL-G11S.3 / BFG 585
5 differences, the largest is module efficiency
06

Written summary

07

Questions about this pairing

Which panel is better: Q-Cells Q.PEAK DUO XL-G11S.3 / BFG 600 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 600 has higher module efficiency (21.50% 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 600 and Q-Cells Q.PEAK DUO RSF XL-G11S.3 / BFG 590?
Q-Cells Q.PEAK DUO XL-G11S.3 / BFG 600 has a module efficiency of 21.50%, 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 600 use vs Q-Cells Q.PEAK DUO RSF XL-G11S.3 / BFG 590?
Q-Cells Q.PEAK DUO XL-G11S.3 / BFG 600 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 600 and Q-Cells Q.PEAK DUO RSF XL-G11S.3 / BFG 590?
Q-Cells Q.PEAK DUO XL-G11S.3 / BFG 600 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 600 and Q-Cells Q.PEAK DUO RSF XL-G11S.3 / BFG 590 bifacial panels?
Both Q-Cells Q.PEAK DUO XL-G11S.3 / BFG 600 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.