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620 vs 635 16 of 19 identical Swap Change panels

GL Solar 3SHBGH-C#-620 vs GL Solar 3SHBGH-C#-635

GL Solar
3SHBGH-C#-620
620 Wp 21.90 % HJT Bifacial
Open panel page Datasheet PDF
VS
GL Solar
3SHBGH-C#-635
635 Wp 22.40 % HJT Bifacial
Open panel page Datasheet PDF
The verdict

635 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 620 635 Difference
Module efficiency 21.90 % 22.40 % 0.50 pp more efficient
Power density 219.1 Wp/m² 224.4 Wp/m² 5.3 Wp/m² higher
Rated power 620 Wp 635 Wp 15 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.
620
20,579 kWh
635
21,077 kWh
Lifetime gap
498 kWh
Output when it is hot
Rated power carried across the range a module actually sees
Scenario 620 635
Standard test conditions 25 °C 100.0% of rated power 620 W 635 W
Cool, bright day 40 °C 96.1% of rated power 596 W 610 W
Typical summer roof 55 °C 92.2% of rated power 572 W 585 W
Hot roof 70 °C 88.3% of rated power 547 W 561 W
03

Full specification

Parameter 620 635 Difference
Power and efficiency
Rated power 620 Wp 635 Wp +15 W for 635
Module efficiency 21.90 % 22.40 % +0.50 pp for 635
Power density 219.1 Wp/m² 224.4 Wp/m² +5.3 Wp/m² for 635
Open-circuit voltage 45.49 V 45.65 V Effectively the same
Voltage at max power 38.12 V 38.72 V Effectively the same
Short-circuit current 17.40 A 17.52 A Effectively the same
Current at max power 16.26 A 16.41 A Effectively the same
Temperature
Temperature coefficient -0.260 %/°C -0.260 %/°C Same
Mechanical
Dimensions 2172x1303x35 mm 2172x1303x35 mm Same
Module area 2.830 m² 2.830 m² Same
Weight 36.0 kg 36.0 kg Same
Weight per kWp 58.1 kg/kWp 56.7 kg/kWp Effectively the same
Warranty and degradation
Product warranty 15 yrs 15 yrs Same
Performance warranty 30 yrs 30 yrs Same
Annual degradation 0.40 %/yr 0.40 %/yr Same
Technology
Cell technology HJT HJT Same
Cell type Monocrystalline Monocrystalline Same
Cell count 120 120 Same
Bifacial Yes Yes Same
04

Against the whole database

14,005 panels
Efficiency
#6,783 vs #4,774
635 leads by 2,009 places
Power density
#6,743 vs #4,734
635 leads by 2,009 places
Heat behaviour
#511 vs #511
Tied - the same position in the database
Weight
#11,548 vs #10,807
635 leads by 741 places
Warranty
#21 vs #21
Tied - the same position in the database
Overall
#3,210 vs #2,176
635 leads by 1,034 places
05

More useful comparisons

Open the full database
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GL Solar 3SHBGH-C#-620 vs GL Solar 3SHBGH-C#-640
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GL Solar 3SHBGH-C#-620 vs GL Solar 3SHBGH-C#-630
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GL Solar 3SHBGH-C#-620 vs GL Solar 3SHBGH-C#-625
One difference: module efficiency
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GL Solar 3SHBGH-C#-620 vs GL Solar 3SHBGH-C#-615
One difference: module efficiency
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GL Solar 3SHBGH-C#-620 vs GL Solar 3SHBGH-C#-610
3 differences, the largest is module efficiency
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GL Solar
GL Solar 3SHBGH-C#-620 vs GL Solar HY-NT10/72GDF-610W
14 differences, the largest is module efficiency
06

Written summary

07

Questions about this pairing

Which panel is better: GL Solar 3SHBGH-C#-620 or GL Solar 3SHBGH-C#-635?
According to our database: GL Solar 3SHBGH-C#-635 has higher module efficiency (22.40% vs 21.90%). See the full spec comparison and 30-year energy simulation above for a complete picture.
What is the efficiency of GL Solar 3SHBGH-C#-620 and GL Solar 3SHBGH-C#-635?
GL Solar 3SHBGH-C#-620 has a module efficiency of 21.90%, while GL Solar 3SHBGH-C#-635 is 22.40%. Higher efficiency means more electricity from the same roof area - useful when space is limited.
What cell technology does GL Solar 3SHBGH-C#-620 use vs GL Solar 3SHBGH-C#-635?
GL Solar 3SHBGH-C#-620 uses HJT cells; GL Solar 3SHBGH-C#-635 uses HJT. 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 GL Solar 3SHBGH-C#-620 and GL Solar 3SHBGH-C#-635?
GL Solar 3SHBGH-C#-620 has a 30 years power warranty; GL Solar 3SHBGH-C#-635 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 GL Solar 3SHBGH-C#-620 and GL Solar 3SHBGH-C#-635 bifacial panels?
Both GL Solar 3SHBGH-C#-620 and GL Solar 3SHBGH-C#-635 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.