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520M vs 510M 16 of 19 identical Swap Change panels

Gokin GK-5-60HG-520M vs Gokin GK-5-60HG-510M

Gokin
GK-5-60HG-520M
520 Wp 23.50 % Back Contact
Open panel page Datasheet PDF
VS
Gokin
GK-5-60HG-510M
510 Wp 23.00 % Back Contact
Open panel page Datasheet PDF
The verdict

520M leads on the differences that matter

The largest is module efficiency: 0.50 pp more efficient. 16 of 19 comparable parameters are identical.

See all 3 differences
How alike are they
16 of 19 comparable
parameters are identical
identical differs
01

What actually differs

3 of 19 parameters
Parameter 520M 510M Difference
Module efficiency 23.50 % 23.00 % 0.50 pp more efficient
Power density 234.7 Wp/m² 230.2 Wp/m² 4.5 Wp/m² higher
Rated power 520 Wp 510 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 (-0.260 %/°C), so a warmer roof scales both curves by the same factor: the totals fall together and neither panel gains on the other.
520M
17,583 kWh
510M
17,245 kWh
Lifetime gap
338 kWh
Output when it is hot
Rated power carried across the range a module actually sees
Scenario 520M 510M
Standard test conditions 25 °C 100.0% of rated power 520 W 510 W
Cool, bright day 40 °C 96.1% of rated power 500 W 490 W
Typical summer roof 55 °C 92.2% of rated power 479 W 470 W
Hot roof 70 °C 88.3% of rated power 459 W 450 W
03

Full specification

Parameter 520M 510M Difference
Power and efficiency
Rated power 520 Wp 510 Wp +10 W for 520M
Module efficiency 23.50 % 23.00 % +0.50 pp for 520M
Power density 234.7 Wp/m² 230.2 Wp/m² +4.5 Wp/m² for 520M
Open-circuit voltage 45.42 V 45.20 V Effectively the same
Voltage at max power 38.30 V 38.10 V Effectively the same
Short-circuit current 14.29 A 14.17 A Effectively the same
Current at max power 13.58 A 13.39 A Effectively the same
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 44.8 kg/kWp 45.7 kg/kWp Effectively the same
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
#716 vs #1,919
520M leads by 1,203 places
Power density
#854 vs #2,128
520M leads by 1,274 places
Heat behaviour
#511 vs #511
Tied - the same position in the database
Weight
#540 vs #836
520M leads by 296 places
Warranty
#21 vs #21
Tied - the same position in the database
Overall
#4,615 vs #5,484
520M leads by 869 places
05

More useful comparisons

Open the full database
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Gokin GK-5-60HG-520M vs Gokin GK-5-60HG-540M
3 differences, the largest is module efficiency
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Gokin GK-5-60HG-520M vs Gokin GK-5-60HG-535M
3 differences, the largest is module efficiency
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Gokin GK-5-60HG-520M vs Gokin GK-5-60HG-530M
3 differences, the largest is module efficiency
Same series, other bin
Gokin
Gokin GK-5-60HG-520M vs Gokin GK-5-60HG-525M
One difference: module efficiency
Same series, other bin
Gokin
Gokin GK-5-60HG-520M vs Gokin GK-5-60HG-515M
One difference: module efficiency
Same series, other bin
Gokin
Gokin GK-5-60HG-520M vs Gokin GK-5-60HG-505M
3 differences, the largest is module efficiency
06

Written summary

07

Questions about this pairing

Which panel is better: Gokin GK-5-60HG-520M or Gokin GK-5-60HG-510M?
According to our database: Gokin GK-5-60HG-520M has higher module efficiency (23.50% vs 23.00%). See the full spec comparison and 30-year energy simulation above for a complete picture.
What is the efficiency of Gokin GK-5-60HG-520M and Gokin GK-5-60HG-510M?
Gokin GK-5-60HG-520M has a module efficiency of 23.50%, while Gokin GK-5-60HG-510M is 23.00%. Higher efficiency means more electricity from the same roof area - useful when space is limited.
What cell technology does Gokin GK-5-60HG-520M use vs Gokin GK-5-60HG-510M?
Gokin GK-5-60HG-520M uses Back Contact cells; Gokin GK-5-60HG-510M 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-520M and Gokin GK-5-60HG-510M?
Gokin GK-5-60HG-520M has a 30 years power warranty; Gokin GK-5-60HG-510M 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.