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GSD8K66H-720WT vs NB-JD580 6 of 18 identical Swap Change panels

Sharp GSD8K66H-720WT vs Sharp NB-JD580

Sharp GSD8K66H-720WT
Sharp
GSD8K66H-720WT
720 Wp 23.18 % HJT Bifacial
Open panel page Datasheet PDF
VS
Sharp
NB-JD580
580 Wp 22.45 % TOPCon Bifacial Incomplete
Open panel page Datasheet PDF
The verdict

GSD8K66H-720WT leads on the differences that matter

The largest is temperature coefficient: 0.040 %/°C better in heat. 6 of 18 comparable parameters are identical, with 1 more left out because at least one datasheet does not publish it.

See all 12 differences
How alike are they
6 of 18 comparable
parameters are identical
identical differs not published
01

What actually differs

12 of 18 parameters
Parameter GSD8K66H-720WT NB-JD580 Difference
Temperature coefficient -0.260 %/°C -0.300 %/°C 0.040 %/°C better in heat
Module efficiency 23.18 % 22.45 % 0.73 pp more efficient
Rated power 720 Wp 580 Wp 140 W more power
Weight 39.0 kg 32.5 kg 6.5 kg lighter
Power density 231.8 Wp/m² 224.5 Wp/m² 7.3 Wp/m² higher
Short-circuit current 17.60 A 14.03 A 3.57 A apart
Module area 3.106 m² 2.583 m² 0.523 m² apart
Cell technology HJT TOPCon HJT vs TOPCon
Current at max power 16.75 A 13.43 A 3.32 A apart
Cell count 132 144 12 cells apart
Open-circuit voltage 50.90 V 52.55 V 1.65 V apart
Dimensions 2384x1303x35 mm 2278x1134x30 mm 2384x1303x35 mm vs 2278x1134x30 mm
02

What it means on a roof

Thirty years of production
A 1.0% first-year loss then 0.40% a year, assumed for both panels, at 1,200 kWh/kWp a year
GSD8K66H-720WT
24,157 kWh
NB-JD580
19,460 kWh
Lifetime gap
4,697 kWh
Output when it is hot
Rated power carried across the range a module actually sees
Scenario GSD8K66H-720WT NB-JD580
Standard test conditions 25 °C 100.0% of rated power 720 W 580 W
Cool, bright day 40 °C 95.5% of rated power 692 W 554 W
Typical summer roof 55 °C 91.0% of rated power 664 W 528 W
Hot roof 70 °C 86.5% of rated power 636 W 502 W
03

Full specification

Parameter GSD8K66H-720WT NB-JD580 Difference
Power and efficiency
Rated power 720 Wp 580 Wp +140 W for GSD8K66H-720WT
Module efficiency 23.18 % 22.45 % +0.73 pp for GSD8K66H-720WT
Power density 231.8 Wp/m² 224.5 Wp/m² +7.3 Wp/m² for GSD8K66H-720WT
Open-circuit voltage 50.90 V 52.55 V 1.65 V apart
Voltage at max power 43.00 V 43.19 V Effectively the same
Short-circuit current 17.60 A 14.03 A 3.57 A apart
Current at max power 16.75 A 13.43 A 3.32 A apart
Temperature
Temperature coefficient -0.260 %/°C -0.300 %/°C +0.040 %/°C for GSD8K66H-720WT
Mechanical
Dimensions 2384x1303x35 mm 2278x1134x30 mm 2384x1303x35 mm vs 2278x1134x30 mm
Module area 3.106 m² 2.583 m² 0.523 m² apart
Weight 39.0 kg 32.5 kg -6.5 kg for NB-JD580
Weight per kWp 54.2 kg/kWp 56.0 kg/kWp Effectively the same
Warranty and degradation
Product warranty 25 yrs 25 yrs Same
Performance warranty 30 yrs 30 yrs Same
Annual degradation 0.35 %/yr - Not published by Sharp
Technology
Cell technology HJT TOPCon HJT vs TOPCon
Cell type Monocrystalline Monocrystalline Same
Cell count 132 144 12 cells apart
Bifacial Yes Yes Same
04

Against the whole database

14,005 panels
Efficiency
#1,424 vs #4,620
GSD8K66H-720WT leads by 3,196 places
Power density
#1,347 vs #4,547
GSD8K66H-720WT leads by 3,200 places
Heat behaviour
#511 vs #6,093
GSD8K66H-720WT leads by 5,582 places
Weight
#8,370 vs #10,343
GSD8K66H-720WT leads by 1,973 places
Warranty
#21 vs #21
Tied - the same position in the database
Overall
#82 vs #2,056
GSD8K66H-720WT leads by 1,974 places
05

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06

Written summary

07

Questions about this pairing

Which panel is better: Sharp GSD8K66H-720WT or Sharp NB-JD580?
According to our database: Sharp GSD8K66H-720WT has higher module efficiency (23.18% vs 22.45%); Sharp GSD8K66H-720WT tolerates heat better (temp coeff -0.260%/°C vs -0.300%/°C). See the full spec comparison and 30-year energy simulation above for a complete picture.
What is the efficiency of Sharp GSD8K66H-720WT and Sharp NB-JD580?
Sharp GSD8K66H-720WT has a module efficiency of 23.18%, while Sharp NB-JD580 is 22.45%. Higher efficiency means more electricity from the same roof area - useful when space is limited.
What cell technology does Sharp GSD8K66H-720WT use vs Sharp NB-JD580?
Sharp GSD8K66H-720WT uses HJT cells; Sharp NB-JD580 uses TOPCon. 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 Sharp GSD8K66H-720WT and Sharp NB-JD580?
Sharp GSD8K66H-720WT has a 30 years power warranty; Sharp NB-JD580 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 Sharp GSD8K66H-720WT and Sharp NB-JD580 bifacial panels?
Both Sharp GSD8K66H-720WT and Sharp NB-JD580 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.