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590 vs 595 18 of 19 identical Swap Change panels

Q-Cells Q.PEAK DUO XL-G11S.3 / BFG 590 vs Q-Cells Q.PEAK DUO XL-G11S.3 / BFG 595

Q-Cells Q.PEAK DUO XL-G11S.3 / BFG 590
Q.PEAK DUO XL-G11S.3 / BFG 590
590 Wp 21.10 % PERC Bifacial
Open panel page Datasheet PDF
VS
Q-Cells Q.PEAK DUO XL-G11S.3 / BFG 595
Q.PEAK DUO XL-G11S.3 / BFG 595
595 Wp 21.30 % PERC Bifacial
Open panel page Datasheet PDF
The verdict

595 leads on the differences that matter

The largest is module efficiency: 0.20 pp more efficient. 18 of 19 comparable parameters are identical.

See the one difference
How alike are they
18 of 19 comparable
parameters are identical
identical differs
01

What actually differs

1 of 19 parameters
Parameter 590 595 Difference
Module efficiency 21.10 % 21.30 % 0.20 pp more efficient
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
595
19,594 kWh
Lifetime gap
165 kWh
Output when it is hot
Rated power carried across the range a module actually sees
Scenario 590 595
Standard test conditions 25 °C 100.0% of rated power 590 W 595 W
Cool, bright day 40 °C 94.9% of rated power 560 W 565 W
Typical summer roof 55 °C 89.8% of rated power 530 W 534 W
Hot roof 70 °C 84.7% of rated power 500 W 504 W
03

Full specification

Parameter 590 595 Difference
Power and efficiency
Rated power 590 Wp 595 Wp Effectively the same
Module efficiency 21.10 % 21.30 % +0.20 pp for 595
Power density 211.3 Wp/m² 213.1 Wp/m² Effectively the same
Open-circuit voltage 53.60 V 53.63 V Effectively the same
Voltage at max power 44.96 V 45.18 V Effectively the same
Short-circuit current 13.74 A 13.77 A Effectively the same
Current at max power 13.12 A 13.17 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 34.9 kg Same
Weight per kWp 59.2 kg/kWp 58.7 kg/kWp Effectively the same
Warranty and degradation
Product warranty 12 yrs 12 yrs Same
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
#9,297 vs #8,519
595 leads by 778 places
Power density
#9,241 vs #8,470
595 leads by 771 places
Heat behaviour
#8,778 vs #8,778
Tied - the same position in the database
Weight
#12,036 vs #11,828
595 leads by 208 places
Warranty
#21 vs #21
Tied - the same position in the database
Overall
#5,771 vs #5,375
595 leads by 396 places
05

More useful comparisons

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

Written summary

07

Questions about this pairing

Which panel is better: Q-Cells Q.PEAK DUO XL-G11S.3 / BFG 590 or Q-Cells Q.PEAK DUO XL-G11S.3 / BFG 595?
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 590 and Q-Cells Q.PEAK DUO XL-G11S.3 / BFG 595?
Q-Cells Q.PEAK DUO XL-G11S.3 / BFG 590 has a module efficiency of 21.10%, while Q-Cells Q.PEAK DUO XL-G11S.3 / BFG 595 is 21.30%. 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 590 use vs Q-Cells Q.PEAK DUO XL-G11S.3 / BFG 595?
Q-Cells Q.PEAK DUO XL-G11S.3 / BFG 590 uses PERC cells; Q-Cells Q.PEAK DUO XL-G11S.3 / BFG 595 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 590 and Q-Cells Q.PEAK DUO XL-G11S.3 / BFG 595?
Q-Cells Q.PEAK DUO XL-G11S.3 / BFG 590 has a 30 years power warranty; Q-Cells Q.PEAK DUO XL-G11S.3 / BFG 595 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 590 and Q-Cells Q.PEAK DUO XL-G11S.3 / BFG 595 bifacial panels?
Both Q-Cells Q.PEAK DUO XL-G11S.3 / BFG 590 and Q-Cells Q.PEAK DUO XL-G11S.3 / BFG 595 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.