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JAM66D42-605/MB vs JAM66D46-735/LB 12 of 19 identical Swap Change panels

JA Solar JAM66D42-605/MB vs JA Solar JAM66D46-735/LB

JA Solar JAM66D42-605/MB
JAM66D42-605/MB
605 Wp 23.40 % TOPCon Bifacial
Open panel page Datasheet PDF
VS
JA Solar JAM66D46-735/LB
JAM66D46-735/LB
735 Wp 23.70 % TOPCon Bifacial
Open panel page Datasheet PDF
The verdict

JAM66D46-735/LB leads on the differences that matter

The largest is rated power: 130 W more power. 12 of 19 comparable parameters are identical.

See all 7 differences
How alike are they
12 of 19 comparable
parameters are identical
identical differs
01

What actually differs

7 of 19 parameters
Parameter JAM66D42-605/MB JAM66D46-735/LB Difference
Rated power 605 Wp 735 Wp 130 W more power
Weight 31.8 kg 38.2 kg 6.4 kg lighter
Short-circuit current 15.46 A 18.70 A 3.24 A apart
Module area 2.583 m² 3.106 m² 0.523 m² apart
Module efficiency 23.40 % 23.70 % 0.30 pp more efficient
Current at max power 14.60 A 17.60 A 3.00 A apart
Dimensions 2278x1134x30 mm 2384x1303x33 mm 2278x1134x30 mm vs 2384x1303x33 mm
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.
JAM66D42-605/MB
20,299 kWh
JAM66D46-735/LB
24,661 kWh
Lifetime gap
4,362 kWh
Output when it is hot
Rated power carried across the range a module actually sees
Scenario JAM66D42-605/MB JAM66D46-735/LB
Standard test conditions 25 °C 100.0% of rated power 605 W 735 W
Cool, bright day 40 °C 95.7% of rated power 579 W 703 W
Typical summer roof 55 °C 91.3% of rated power 552 W 671 W
Hot roof 70 °C 87.0% of rated power 526 W 639 W
03

Full specification

Parameter JAM66D42-605/MB JAM66D46-735/LB Difference
Power and efficiency
Rated power 605 Wp 735 Wp +130 W for JAM66D46-735/LB
Module efficiency 23.40 % 23.70 % +0.30 pp for JAM66D46-735/LB
Power density 234.2 Wp/m² 236.6 Wp/m² Effectively the same
Open-circuit voltage 49.19 V 49.60 V Effectively the same
Voltage at max power 41.44 V 41.77 V Effectively the same
Short-circuit current 15.46 A 18.70 A 3.24 A apart
Current at max power 14.60 A 17.60 A 3.00 A apart
Temperature
Temperature coefficient -0.290 %/°C -0.290 %/°C Same
Mechanical
Dimensions 2278x1134x30 mm 2384x1303x33 mm 2278x1134x30 mm vs 2384x1303x33 mm
Module area 2.583 m² 3.106 m² 0.523 m² apart
Weight 31.8 kg 38.2 kg -6.4 kg for JAM66D42-605/MB
Weight per kWp 52.6 kg/kWp 52.0 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 132 132 Same
Bifacial Yes Yes Same
04

Against the whole database

14,129 panels
Efficiency
#919 vs #549
JAM66D46-735/LB leads by 370 places
Power density
#900 vs #614
JAM66D46-735/LB leads by 286 places
Heat behaviour
#2,220 vs #2,220
Tied - the same position in the database
Weight
#6,237 vs #5,445
JAM66D46-735/LB leads by 792 places
Warranty
#21 vs #21
Tied - the same position in the database
Overall
#2,592 vs #234
JAM66D46-735/LB leads by 2,358 places
05

More useful comparisons

Open the full database
Same series, other bin
JA Solar JAM66D42-605/MB vs JA Solar JAM66D42-600/MB
One difference: module efficiency
Same series, other bin
JA Solar JAM66D42-605/MB vs JA Solar JAM66D42-595/MB
3 differences, the largest is module efficiency
Same series, other bin
JA Solar JAM66D42-605/MB vs JA Solar JAM66D42-590/MB
3 differences, the largest is module efficiency
Same series, other bin
JA Solar JAM66D42-605/MB vs JA Solar JAM66D42-585/MB
3 differences, the largest is module efficiency
Same series, other bin
JA Solar JAM66D42-605/MB vs JA Solar JAM66D42-580/MB
6 differences, the largest is module efficiency
Same series, other bin
JA Solar JAM66D46-735/LB vs JA Solar JAM66D46-740/LB
The same specification on paper
06

Written summary

07

Questions about this pairing

Which panel is better: JA Solar JAM66D42-605/MB or JA Solar JAM66D46-735/LB?
According to our database: JA Solar JAM66D46-735/LB has higher module efficiency (23.70% vs 23.40%). See the full spec comparison and 30-year energy simulation above for a complete picture.
What is the efficiency of JA Solar JAM66D42-605/MB and JA Solar JAM66D46-735/LB?
JA Solar JAM66D42-605/MB has a module efficiency of 23.40%, while JA Solar JAM66D46-735/LB is 23.70%. Higher efficiency means more electricity from the same roof area - useful when space is limited.
What cell technology does JA Solar JAM66D42-605/MB use vs JA Solar JAM66D46-735/LB?
JA Solar JAM66D42-605/MB uses TOPCon cells; JA Solar JAM66D46-735/LB 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 JA Solar JAM66D42-605/MB and JA Solar JAM66D46-735/LB?
JA Solar JAM66D42-605/MB has a 30 years power warranty; JA Solar JAM66D46-735/LB 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 JA Solar JAM66D42-605/MB and JA Solar JAM66D46-735/LB bifacial panels?
Both JA Solar JAM66D42-605/MB and JA Solar JAM66D46-735/LB 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 327 JA 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.