JAT54S41-470/LR vs JAM66D46-735/LB 5 of 19 identical Swap Change panels

JA Solar JAT54S41-470/LR vs JA Solar JAM66D46-735/LB

Q: Which panel is better: JA Solar JAT54S41-470/LR or JA Solar JAM66D46-735/LB?

According to our database: JA Solar JAM66D46-735/LB has higher module efficiency (23.70% vs 23.50%); JA Solar JAT54S41-470/LR tolerates heat better (temp coeff -0.260%/°C vs -0.290%/°C). See the full spec comparison and 30-year energy simulation above for a complete picture.

Q: What is the efficiency of JA Solar JAT54S41-470/LR and JA Solar JAM66D46-735/LB?

JA Solar JAT54S41-470/LR has a module efficiency of 23.50%, while JA Solar JAM66D46-735/LB is 23.70%. Higher efficiency means more electricity from the same roof area - useful when space is limited.

Q: What cell technology does JA Solar JAT54S41-470/LR use vs JA Solar JAM66D46-735/LB?

JA Solar JAT54S41-470/LR 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.

Q: What is the warranty on JA Solar JAT54S41-470/LR and JA Solar JAM66D46-735/LB?

JA Solar JAT54S41-470/LR 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.

Q: Are JA Solar JAT54S41-470/LR and JA Solar JAM66D46-735/LB bifacial panels?

JA Solar JAM66D46-735/LB is bifacial (captures light from both faces); JA Solar JAT54S41-470/LR is monofacial. Bifacial panels work best on ground mounts or raised structures with a light-coloured surface underneath.

JAT54S41-470/LR

470 Wp 23.50 % TOPCon

Open panel page Datasheet PDF

JAM66D46-735/LB

735 Wp 23.70 % TOPCon Bifacial

Open panel page Datasheet PDF

The verdict

JAT54S41-470/LR leads on the differences that matter

The largest is rated power: 265 W more power. 5 of 19 comparable parameters are identical.

See all 14 differences

How alike are they

5 of 19 comparable
parameters are identical

identical differs

What actually differs

14 of 19 parameters

Parameter JAT54S41-470/LR JAM66D46-735/LB Difference

Rated power 470 Wp 735 Wp 265 W more power

Temperature coefficient -0.260 %/°C -0.290 %/°C 0.030 %/°C better in heat

Weight 19.3 kg 38.2 kg 18.9 kg lighter

Weight per kWp 41.1 kg/kWp 52.0 kg/kWp 10.9 kg/kWp lighter

Product warranty 25 yrs 12 yrs 13 yrs longer

Open-circuit voltage 40.96 V 49.60 V 8.64 V apart

Short-circuit current 14.84 A 18.70 A 3.86 A apart

Module area 1.998 m² 3.106 m² 1.108 m² apart

Module efficiency 23.50 % 23.70 % 0.20 pp more efficient

Voltage at max power 34.74 V 41.77 V 7.03 V apart

Current at max power 13.54 A 17.60 A 4.06 A apart

Cell count 108 132 24 cells apart

Bifacial No Yes No vs Yes

Dimensions 1762x1134x30 mm 2384x1303x33 mm 1762x1134x30 mm vs 2384x1303x33 mm

What it means on a roof

Thirty years of production

Each panel's own declared degradation curve, at 1,200 kWh/kWp a year

Cell temperature

JAT54S41-470/LR

15,769 kWh

JAM66D46-735/LB

24,661 kWh

Lifetime gap

8,892 kWh

Output when it is hot

Rated power carried across the range a module actually sees

Scenario JAT54S41-470/LR JAM66D46-735/LB

Standard test conditions 25 °C 100.0% of rated power 470 W 735 W

Cool, bright day 40 °C 95.7% of rated power 452 W 703 W

Typical summer roof 55 °C 91.3% of rated power 433 W 671 W

Hot roof 70 °C 87.0% of rated power 415 W 639 W

Full specification

Parameter JAT54S41-470/LR JAM66D46-735/LB Difference

Power and efficiency

Rated power 470 Wp 735 Wp +265 W for JAM66D46-735/LB

Module efficiency 23.50 % 23.70 % +0.20 pp for JAM66D46-735/LB

Power density 235.2 Wp/m² 236.6 Wp/m² Effectively the same

Open-circuit voltage 40.96 V 49.60 V 8.64 V apart

Voltage at max power 34.74 V 41.77 V 7.03 V apart

Short-circuit current 14.84 A 18.70 A 3.86 A apart

Current at max power 13.54 A 17.60 A 4.06 A apart

Temperature

Temperature coefficient -0.260 %/°C -0.290 %/°C +0.030 %/°C for JAT54S41-470/LR

Mechanical

Dimensions 1762x1134x30 mm 2384x1303x33 mm 1762x1134x30 mm vs 2384x1303x33 mm

Module area 1.998 m² 3.106 m² 1.108 m² apart

Weight 19.3 kg 38.2 kg -18.9 kg for JAT54S41-470/LR

Weight per kWp 41.1 kg/kWp 52.0 kg/kWp -10.9 kg/kWp for JAT54S41-470/LR

Warranty and degradation

Product warranty 25 yrs 12 yrs +13 yrs for JAT54S41-470/LR

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 108 132 24 cells apart

Bifacial No Yes No vs Yes

Against the whole database

14,005 panels

Efficiency

#716 vs #517

JAM66D46-735/LB leads by 199 places

Power density

#674 vs #582

JAM66D46-735/LB leads by 92 places

Heat behaviour

#511 vs #2,165

JAT54S41-470/LR leads by 1,654 places

Weight

#170 vs #5,413

JAT54S41-470/LR leads by 5,243 places

Warranty

#21 vs #21

Tied - the same position in the database

Overall

#4,126 vs #233

JAM66D46-735/LB leads by 3,893 places

More useful comparisons

Open the full database

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JA Solar JAT54S41-470/LR vs JA Solar JAT54S41-475/LR

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JA Solar JAT54S41-470/LR vs JA Solar JAT54S41-465/LR

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JA Solar JAT54S41-470/LR vs JA Solar JAT54S41-460/LR

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Same series, other bin

JA Solar JAT54S41-470/LR vs JA Solar JAT54S41-455/LR

3 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

Written summary

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Questions about this pairing

Which panel is better: JA Solar JAT54S41-470/LR or JA Solar JAM66D46-735/LB?

According to our database: JA Solar JAM66D46-735/LB has higher module efficiency (23.70% vs 23.50%); JA Solar JAT54S41-470/LR tolerates heat better (temp coeff -0.260%/°C vs -0.290%/°C). See the full spec comparison and 30-year energy simulation above for a complete picture.

What is the efficiency of JA Solar JAT54S41-470/LR and JA Solar JAM66D46-735/LB?

JA Solar JAT54S41-470/LR has a module efficiency of 23.50%, 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 JAT54S41-470/LR use vs JA Solar JAM66D46-735/LB?

JA Solar JAT54S41-470/LR 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 JAT54S41-470/LR and JA Solar JAM66D46-735/LB?

JA Solar JAT54S41-470/LR 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 JAT54S41-470/LR and JA Solar JAM66D46-735/LB bifacial panels?

JA Solar JAM66D46-735/LB is bifacial (captures light from both faces); JA Solar JAT54S41-470/LR is monofacial. Bifacial panels work best on ground mounts or raised structures with a light-coloured surface underneath.

Shop prices: See 389 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.