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JKM620N-66HL4M-BDV vs JKM640N-66HL4M-BDV 16 of 19 identical Swap Change panels

Jinko Solar JKM620N-66HL4M-BDV vs Jinko Solar JKM640N-66HL4M-BDV

Jinko Solar JKM620N-66HL4M-BDV
JKM620N-66HL4M-BDV
620 Wp 22.95 % N-type Bifacial
Open panel page Datasheet PDF
VS
Jinko Solar JKM640N-66HL4M-BDV
JKM640N-66HL4M-BDV
640 Wp 23.69 % N-type Bifacial
Open panel page Datasheet PDF
The verdict

JKM640N-66HL4M-BDV leads on the differences that matter

The largest is module efficiency: 0.74 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 JKM620N-66HL4M-BDV JKM640N-66HL4M-BDV Difference
Module efficiency 22.95 % 23.69 % 0.74 pp more efficient
Power density 229.5 Wp/m² 236.9 Wp/m² 7.4 Wp/m² higher
Rated power 620 Wp 640 Wp 20 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 (-0.290 %/°C), so a warmer roof scales both curves by the same factor: the totals fall together and neither panel gains on the other.
JKM620N-66HL4M-BDV
20,802 kWh
JKM640N-66HL4M-BDV
21,473 kWh
Lifetime gap
671 kWh
Output when it is hot
Rated power carried across the range a module actually sees
Scenario JKM620N-66HL4M-BDV JKM640N-66HL4M-BDV
Standard test conditions 25 °C 100.0% of rated power 620 W 640 W
Cool, bright day 40 °C 95.7% of rated power 593 W 612 W
Typical summer roof 55 °C 91.3% of rated power 566 W 584 W
Hot roof 70 °C 87.0% of rated power 539 W 556 W
03

Full specification

Parameter JKM620N-66HL4M-BDV JKM640N-66HL4M-BDV Difference
Power and efficiency
Rated power 620 Wp 640 Wp +20 W for JKM640N-66HL4M-BDV
Module efficiency 22.95 % 23.69 % +0.74 pp for JKM640N-66HL4M-BDV
Power density 229.5 Wp/m² 236.9 Wp/m² +7.4 Wp/m² for JKM640N-66HL4M-BDV
Open-circuit voltage 49.08 V 49.88 V Effectively the same
Voltage at max power 40.74 V 41.30 V Effectively the same
Short-circuit current 16.08 A 16.32 A Effectively the same
Current at max power 15.22 A 15.50 A Effectively the same
Temperature
Temperature coefficient -0.290 %/°C -0.290 %/°C Same
Mechanical
Dimensions 2382x1134x30 mm 2382x1134x30 mm Same
Module area 2.701 m² 2.701 m² Same
Weight 32.4 kg 32.4 kg Same
Weight per kWp 52.3 kg/kWp 50.6 kg/kWp Effectively the same
Warranty and degradation
Product warranty 12 yrs 12 yrs Same
Performance warranty 30 yrs 30 yrs Same
Annual degradation 0.40 %/yr 0.40 %/yr Same
Technology
Cell technology N-type N-type Same
Cell type Monocrystalline Monocrystalline Same
Cell count 132 132 Same
Bifacial Yes Yes Same
04

Against the whole database

14,005 panels
Efficiency
#2,268 vs #580
JKM640N-66HL4M-BDV leads by 1,688 places
Power density
#2,191 vs #521
JKM640N-66HL4M-BDV leads by 1,670 places
Heat behaviour
#2,165 vs #2,165
Tied - the same position in the database
Weight
#5,719 vs #4,069
JKM640N-66HL4M-BDV leads by 1,650 places
Warranty
#21 vs #21
Tied - the same position in the database
Overall
#2,572 vs #1,530
JKM640N-66HL4M-BDV leads by 1,042 places
05

More useful comparisons

Open the full database
Same series, other bin
Jinko Solar JKM620N-66HL4M-BDV vs Jinko Solar JKM635N-66HL4M-BDV
3 differences, the largest is module efficiency
Same series, other bin
Jinko Solar JKM620N-66HL4M-BDV vs Jinko Solar JKM630N-66HL4M-BDV
3 differences, the largest is module efficiency
Same series, other bin
Jinko Solar JKM620N-66HL4M-BDV vs Jinko Solar JKM625N-66HL4M-BDV
The same specification on paper
Same series, other bin
Jinko Solar JKM620N-66HL4M-BDV vs Jinko Solar JKM615N-66HL4M-BDV
The same specification on paper
Same manufacturer
Jinko Solar JKM620N-66HL4M-BDV vs Jinko Solar JKM710-735N-66HL5-BDV-Z3-EU (735W bin)
9 differences, the largest is module efficiency
Same manufacturer
Jinko Solar JKM620N-66HL4M-BDV vs Jinko Solar JKM735N-66HL5-BDV-Z3-EU
9 differences, the largest is module efficiency
06

Written summary

07

Questions about this pairing

Which panel is better: Jinko Solar JKM620N-66HL4M-BDV or Jinko Solar JKM640N-66HL4M-BDV?
According to our database: Jinko Solar JKM640N-66HL4M-BDV has higher module efficiency (23.69% vs 22.95%). See the full spec comparison and 30-year energy simulation above for a complete picture.
What is the efficiency of Jinko Solar JKM620N-66HL4M-BDV and Jinko Solar JKM640N-66HL4M-BDV?
Jinko Solar JKM620N-66HL4M-BDV has a module efficiency of 22.95%, while Jinko Solar JKM640N-66HL4M-BDV is 23.69%. Higher efficiency means more electricity from the same roof area - useful when space is limited.
What cell technology does Jinko Solar JKM620N-66HL4M-BDV use vs Jinko Solar JKM640N-66HL4M-BDV?
Jinko Solar JKM620N-66HL4M-BDV uses N-type cells; Jinko Solar JKM640N-66HL4M-BDV uses N-type. 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 Jinko Solar JKM620N-66HL4M-BDV and Jinko Solar JKM640N-66HL4M-BDV?
Jinko Solar JKM620N-66HL4M-BDV has a 30 years power warranty; Jinko Solar JKM640N-66HL4M-BDV 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 Jinko Solar JKM620N-66HL4M-BDV and Jinko Solar JKM640N-66HL4M-BDV bifacial panels?
Both Jinko Solar JKM620N-66HL4M-BDV and Jinko Solar JKM640N-66HL4M-BDV 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.

Shop prices: See 172 Jinko Solar offers

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.