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540M vs 505M 14 of 19 identical Swap Change panels

Gokin GK-5-60HG-540M vs Gokin GK-5-60HG-505M

Gokin
GK-5-60HG-540M
540 Wp 24.40 % Back Contact
Open panel page Datasheet PDF
VS
Gokin
GK-5-60HG-505M
505 Wp 22.80 % Back Contact
Open panel page Datasheet PDF
The verdict

540M leads on the differences that matter

The largest is module efficiency: 1.60 pp more efficient. 14 of 19 comparable parameters are identical.

See all 5 differences
How alike are they
14 of 19 comparable
parameters are identical
identical differs
01

What actually differs

5 of 19 parameters
Parameter 540M 505M Difference
Module efficiency 24.40 % 22.80 % 1.60 pp more efficient
Power density 243.7 Wp/m² 227.9 Wp/m² 15.8 Wp/m² higher
Rated power 540 Wp 505 Wp 35 W more power
Weight per kWp 43.1 kg/kWp 46.1 kg/kWp 3.0 kg/kWp lighter
Current at max power 13.95 A 13.30 A 0.65 A apart
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 (-0.260 %/°C), so a warmer roof scales both curves by the same factor: the totals fall together and neither panel gains on the other.
540M
18,259 kWh
505M
17,076 kWh
Lifetime gap
1,183 kWh
Output when it is hot
Rated power carried across the range a module actually sees
Scenario 540M 505M
Standard test conditions 25 °C 100.0% of rated power 540 W 505 W
Cool, bright day 40 °C 96.1% of rated power 519 W 485 W
Typical summer roof 55 °C 92.2% of rated power 498 W 466 W
Hot roof 70 °C 88.3% of rated power 477 W 446 W
03

Full specification

Parameter 540M 505M Difference
Power and efficiency
Rated power 540 Wp 505 Wp +35 W for 540M
Module efficiency 24.40 % 22.80 % +1.60 pp for 540M
Power density 243.7 Wp/m² 227.9 Wp/m² +15.8 Wp/m² for 540M
Open-circuit voltage 45.82 V 45.10 V Effectively the same
Voltage at max power 38.70 V 38.00 V Effectively the same
Short-circuit current 14.53 A 14.11 A Effectively the same
Current at max power 13.95 A 13.30 A 0.65 A apart
Temperature
Temperature coefficient -0.260 %/°C -0.260 %/°C Same
Mechanical
Dimensions 1954x1134x30 mm 1954x1134x30 mm Same
Module area 2.216 m² 2.216 m² Same
Weight 23.3 kg 23.3 kg Same
Weight per kWp 43.1 kg/kWp 46.1 kg/kWp -3.0 kg/kWp for 540M
Warranty and degradation
Product warranty 15 yrs 15 yrs Same
Performance warranty 30 yrs 30 yrs Same
Annual degradation 0.35 %/yr 0.35 %/yr Same
Technology
Cell technology Back Contact Back Contact Same
Cell type Monocrystalline Monocrystalline Same
Cell count 120 120 Same
Bifacial No No Same
04

Against the whole database

14,005 panels
Efficiency
#99 vs #2,714
540M leads by 2,615 places
Power density
#130 vs #2,788
540M leads by 2,658 places
Heat behaviour
#511 vs #511
Tied - the same position in the database
Weight
#267 vs #1,014
540M leads by 747 places
Warranty
#21 vs #21
Tied - the same position in the database
Overall
#2,863 vs #5,902
540M leads by 3,039 places
05

More useful comparisons

Open the full database
Same series, other bin
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Gokin GK-5-60HG-540M vs Gokin GK-5-60HG-535M
One difference: module efficiency
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Gokin GK-5-60HG-540M vs Gokin GK-5-60HG-530M
3 differences, the largest is module efficiency
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Gokin GK-5-60HG-540M vs Gokin GK-5-60HG-525M
3 differences, the largest is module efficiency
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Gokin GK-5-60HG-540M vs Gokin GK-5-60HG-520M
3 differences, the largest is module efficiency
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Gokin GK-5-60HG-540M vs Gokin GK-5-60HG-515M
4 differences, the largest is module efficiency
Same series, other bin
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Gokin GK-5-60HG-540M vs Gokin GK-5-60HG-510M
5 differences, the largest is module efficiency
06

Written summary

07

Questions about this pairing

Which panel is better: Gokin GK-5-60HG-540M or Gokin GK-5-60HG-505M?
According to our database: Gokin GK-5-60HG-540M has higher module efficiency (24.40% vs 22.80%). See the full spec comparison and 30-year energy simulation above for a complete picture.
What is the efficiency of Gokin GK-5-60HG-540M and Gokin GK-5-60HG-505M?
Gokin GK-5-60HG-540M has a module efficiency of 24.40%, while Gokin GK-5-60HG-505M is 22.80%. Higher efficiency means more electricity from the same roof area - useful when space is limited.
What cell technology does Gokin GK-5-60HG-540M use vs Gokin GK-5-60HG-505M?
Gokin GK-5-60HG-540M uses Back Contact cells; Gokin GK-5-60HG-505M uses Back Contact. 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 Gokin GK-5-60HG-540M and Gokin GK-5-60HG-505M?
Gokin GK-5-60HG-540M has a 30 years power warranty; Gokin GK-5-60HG-505M 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.

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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.