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(650W) vs (640W) 16 of 19 identical Swap Change panels

Jinko Solar JKM625-650N-78HL4-BDV (650W) vs Jinko Solar JKM625-650N-78HL4-BDV (640W)

Jinko Solar JKM625-650N-78HL4-BDV (650W)
JKM625-650N-78HL4-BDV (650W)
650 Wp 23.25 % TOPCon Bifacial
Open panel page Datasheet PDF
VS
Jinko Solar JKM625-650N-78HL4-BDV (640W)
JKM625-650N-78HL4-BDV (640W)
640 Wp 22.90 % TOPCon Bifacial
Open panel page Datasheet PDF
The verdict

(650W) leads on the differences that matter

The largest is module efficiency: 0.35 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 (650W) (640W) Difference
Module efficiency 23.25 % 22.90 % 0.35 pp more efficient
Power density 232.5 Wp/m² 229.0 Wp/m² 3.6 Wp/m² higher
Rated power 650 Wp 640 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 (-0.290 %/°C), so a warmer roof scales both curves by the same factor: the totals fall together and neither panel gains on the other.
(650W)
21,809 kWh
(640W)
21,473 kWh
Lifetime gap
336 kWh
Output when it is hot
Rated power carried across the range a module actually sees
Scenario (650W) (640W)
Standard test conditions 25 °C 100.0% of rated power 650 W 640 W
Cool, bright day 40 °C 95.7% of rated power 622 W 612 W
Typical summer roof 55 °C 91.3% of rated power 593 W 584 W
Hot roof 70 °C 87.0% of rated power 565 W 556 W
03

Full specification

Parameter (650W) (640W) Difference
Power and efficiency
Rated power 650 Wp 640 Wp +10 W for (650W)
Module efficiency 23.25 % 22.90 % +0.35 pp for (650W)
Power density 232.5 Wp/m² 229.0 Wp/m² +3.6 Wp/m² for (650W)
Open-circuit voltage 57.60 V 57.34 V Effectively the same
Voltage at max power 48.33 V 48.02 V Effectively the same
Short-circuit current 14.10 A 13.98 A Effectively the same
Current at max power 13.45 A 13.33 A Effectively the same
Temperature
Temperature coefficient -0.290 %/°C -0.290 %/°C Same
Mechanical
Dimensions 2465x1134x30 mm 2465x1134x30 mm Same
Module area 2.795 m² 2.795 m² Same
Weight 34.0 kg 34.0 kg Same
Weight per kWp 52.3 kg/kWp 53.1 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 TOPCon TOPCon Same
Cell type Monocrystalline Monocrystalline Same
Cell count 156 156 Same
Bifacial Yes Yes Same
04

Against the whole database

14,005 panels
Efficiency
#1,239 vs #2,359
(650W) leads by 1,120 places
Power density
#1,222 vs #2,389
(650W) leads by 1,167 places
Heat behaviour
#2,165 vs #2,165
Tied - the same position in the database
Weight
#5,769 vs #6,913
(650W) leads by 1,144 places
Warranty
#21 vs #21
Tied - the same position in the database
Overall
#1,648 vs #2,068
(650W) leads by 420 places
05

More useful comparisons

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Jinko Solar JKM625-650N-78HL4-BDV (650W) vs Jinko Solar JKM645N-78HL4-BDV
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06

Written summary

07

Questions about this pairing

Which panel is better: Jinko Solar JKM625-650N-78HL4-BDV (650W) or Jinko Solar JKM625-650N-78HL4-BDV (640W)?
According to our database: Jinko Solar JKM625-650N-78HL4-BDV (650 W) has higher module efficiency (23.25% vs 22.90%). See the full spec comparison and 30-year energy simulation above for a complete picture.
What is the efficiency of Jinko Solar JKM625-650N-78HL4-BDV (650W) and Jinko Solar JKM625-650N-78HL4-BDV (640W)?
Jinko Solar JKM625-650N-78HL4-BDV (650 W) has a module efficiency of 23.25%, while Jinko Solar JKM625-650N-78HL4-BDV (640 W) is 22.90%. Higher efficiency means more electricity from the same roof area - useful when space is limited.
What cell technology does Jinko Solar JKM625-650N-78HL4-BDV (650W) use vs Jinko Solar JKM625-650N-78HL4-BDV (640W)?
Jinko Solar JKM625-650N-78HL4-BDV (650 W) uses TOPCon cells; Jinko Solar JKM625-650N-78HL4-BDV (640 W) 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 Jinko Solar JKM625-650N-78HL4-BDV (650W) and Jinko Solar JKM625-650N-78HL4-BDV (640W)?
Jinko Solar JKM625-650N-78HL4-BDV (650 W) has a 30 years power warranty; Jinko Solar JKM625-650N-78HL4-BDV (640 W) 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 JKM625-650N-78HL4-BDV (650W) and Jinko Solar JKM625-650N-78HL4-BDV (640W) bifacial panels?
Both Jinko Solar JKM625-650N-78HL4-BDV (650 W) and Jinko Solar JKM625-650N-78HL4-BDV (640 W) 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.