Jinko Solar JKM645N-78HL4-BDV-F9-EU vs Jinko Solar JKM635N-78HL4-BDV-F9-EU
VS
The verdict
JKM645N-78HL4-BDV-F9-EU 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 differencesHow alike are they
16
of 19 comparable
parameters are identical
parameters are identical
identical
differs
01
3 of 19 parameters
What actually differs
Parameter
JKM645N-78HL4-BDV-F9-EU
JKM635N-78HL4-BDV-F9-EU
Difference
Module efficiency
23.07 %
22.72 %
0.35 pp more efficient
Power density
230.7 Wp/m²
227.2 Wp/m²
3.6 Wp/m² higher
Rated power
645 Wp
635 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.
JKM645N-78HL4-BDV-F9-EU
21,641 kWh
JKM635N-78HL4-BDV-F9-EU
21,306 kWh
Lifetime gap
335 kWh
Output when it is hot
Rated power carried across the range a module actually sees
Scenario
JKM645N-78HL4-BDV-F9-EU
JKM635N-78HL4-BDV-F9-EU
Standard test conditions
25 °C
100.0% of rated power
645 W
635 W
Cool, bright day
40 °C
95.7% of rated power
617 W
607 W
Typical summer roof
55 °C
91.3% of rated power
589 W
580 W
Hot roof
70 °C
87.0% of rated power
561 W
552 W
03
Full specification
Parameter
JKM645N-78HL4-BDV-F9-EU
JKM635N-78HL4-BDV-F9-EU
Difference
Power and efficiency
Rated power
645 Wp
635 Wp
+10 W for JKM645N-78HL4-BDV-F9-EU
Module efficiency
23.07 %
22.72 %
+0.35 pp for JKM645N-78HL4-BDV-F9-EU
Power density
230.7 Wp/m²
227.2 Wp/m²
+3.6 Wp/m² for JKM645N-78HL4-BDV-F9-EU
Open-circuit voltage
57.47 V
57.21 V
Effectively the same
Voltage at max power
48.17 V
47.86 V
Effectively the same
Short-circuit current
14.04 A
13.92 A
Effectively the same
Current at max power
13.39 A
13.27 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
52.7 kg/kWp
53.5 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
14,005 panels
Against the whole database
Efficiency
#1,683
vs
#3,245
JKM645N-78HL4-BDV-F9-EU leads by 1,562 places
Power density
#1,654
vs
#3,252
JKM645N-78HL4-BDV-F9-EU leads by 1,598 places
Heat behaviour
#2,165
vs
#2,165
Tied - the same position in the database
Weight
#6,362
vs
#7,535
JKM645N-78HL4-BDV-F9-EU leads by 1,173 places
Warranty
#21
vs
#21
Tied - the same position in the database
Overall
#1,852
vs
#2,340
JKM645N-78HL4-BDV-F9-EU leads by 488 places
05
Open the full database
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06
Written summary
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07
Questions about this pairing
Which panel is better: Jinko Solar JKM645N-78HL4-BDV-F9-EU or Jinko Solar JKM635N-78HL4-BDV-F9-EU?
According to our database: Jinko Solar JKM645N-78HL4-BDV-F9-EU has higher module efficiency (23.07% vs 22.72%). See the full spec comparison and 30-year energy simulation above for a complete picture.
What is the efficiency of Jinko Solar JKM645N-78HL4-BDV-F9-EU and Jinko Solar JKM635N-78HL4-BDV-F9-EU?
Jinko Solar JKM645N-78HL4-BDV-F9-EU has a module efficiency of 23.07%, while Jinko Solar JKM635N-78HL4-BDV-F9-EU is 22.72%. Higher efficiency means more electricity from the same roof area - useful when space is limited.
What cell technology does Jinko Solar JKM645N-78HL4-BDV-F9-EU use vs Jinko Solar JKM635N-78HL4-BDV-F9-EU?
Jinko Solar JKM645N-78HL4-BDV-F9-EU uses TOPCon cells; Jinko Solar JKM635N-78HL4-BDV-F9-EU 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 JKM645N-78HL4-BDV-F9-EU and Jinko Solar JKM635N-78HL4-BDV-F9-EU?
Jinko Solar JKM645N-78HL4-BDV-F9-EU has a 30 years power warranty; Jinko Solar JKM635N-78HL4-BDV-F9-EU 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 JKM645N-78HL4-BDV-F9-EU and Jinko Solar JKM635N-78HL4-BDV-F9-EU bifacial panels?
Both Jinko Solar JKM645N-78HL4-BDV-F9-EU and Jinko Solar JKM635N-78HL4-BDV-F9-EU 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 170 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.