---
title: "JA Solar JAM66D46-740/LB vs JA Solar JAM72D30-570/LB/1500V - Solar Panel Comparison | ComparePV"
description: "Compare JA Solar JAM66D46-740/LB vs JA Solar JAM72D30-570/LB/1500V side by side: what actually differs, output when it is hot, thirty-year production, and the full specification."
source: "https://comparepv.com/compare/ja-solar-jam66d46-740-lb/ja-solar-jam72d30-570-lb-1500v"
updated: 2026-09-11
---

# JA Solar JAM66D46-740/LB vs JA Solar JAM72D30-570/LB/1500V

JAM66D46-740/LB leads on the differences that matter

The largest is module efficiency: 2.30 pp more efficient. 6 of 19 comparable parameters are identical.


## The two panels


| Attribute | A | B |
| --- | --- | --- |
| Panel | [JA Solar JAM66D46-740/LB](https://comparepv.com/panel/ja-solar-jam66d46-740-lb) | [JA Solar JAM72D30-570/LB/1500V](https://comparepv.com/panel/ja-solar-jam72d30-570-lb-1500v) |
| Manufacturer | JA Solar | JA Solar |
| Power | 740 Wp | 570 Wp |
| Efficiency | 23.80 % | 21.50 % |
| Technology | TOPCon | PERC |


## Where they differ

Ranked by how much the difference matters, not by datasheet order.


| Parameter | JAM66D46-740/LB | JAM72D30-570/LB/1500V | Difference |
| --- | --- | --- | --- |
| Module efficiency | 23.80 % | 21.50 % | +2.30 pp for JAM66D46-740/LB |
| Temperature coefficient | -0.290 %/°C | -0.350 %/°C | +0.060 %/°C for JAM66D46-740/LB |
| Rated power | 740 Wp | 570 Wp | +170 W for JAM66D46-740/LB |
| Power density | 238.2 Wp/m² | 215.5 Wp/m² | +22.8 Wp/m² for JAM66D46-740/LB |
| Weight | 38.2 kg | 32.5 kg | -5.7 kg for JAM72D30-570/LB/1500V |
| Weight per kWp | 51.6 kg/kWp | 57.0 kg/kWp | -5.4 kg/kWp for JAM66D46-740/LB |
| Short-circuit current | 18.73 A | 14.37 A | 4.36 A apart |
| Module area | 3.106 m² | 2.646 m² | 0.461 m² apart |
| Cell technology | TOPCon | PERC | TOPCon vs PERC |
| Current at max power | 17.64 A | 13.62 A | 4.02 A apart |
| Cell count | 132 | 144 | 12 cells apart |
| Annual degradation | 0.40 %/yr | 0.45 %/yr | -0.05 %/yr for JAM66D46-740/LB |
| Dimensions | 2384x1303x33 mm | 2333x1134x30 mm | 2384x1303x33 mm vs 2333x1134x30 mm |


## Every compared parameter


| Parameter | JAM66D46-740/LB | JAM72D30-570/LB/1500V |
| --- | --- | --- |
| Rated power | 740 Wp | 570 Wp |
| Module efficiency | 23.80 % | 21.50 % |
| Power density | 238.2 Wp/m² | 215.5 Wp/m² |
| Open-circuit voltage | 49.80 V | 50.68 V |
| Voltage at max power | 41.96 V | 41.87 V |
| Short-circuit current | 18.73 A | 14.37 A |
| Current at max power | 17.64 A | 13.62 A |
| Temperature coefficient | -0.290 %/°C | -0.350 %/°C |
| Dimensions | 2384x1303x33 mm | 2333x1134x30 mm |
| Module area | 3.106 m² | 2.646 m² |
| Weight | 38.2 kg | 32.5 kg |
| Weight per kWp | 51.6 kg/kWp | 57.0 kg/kWp |
| Product warranty | 12 yrs | 12 yrs |
| Performance warranty | 30 yrs | 30 yrs |
| Annual degradation | 0.40 %/yr | 0.45 %/yr |
| Cell technology | TOPCon | PERC |
| Cell type | Monocrystalline | Monocrystalline |
| Cell count | 132 | 144 |
| Bifacial | Yes | Yes |


## Thirty-year yield

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

- **Cumulative output, JAM66D46-740/LB:** 24,828 kWh
- **Cumulative output, JAM72D30-570/LB/1500V:** 18,771 kWh
- **Gap:** 6,057 kWh


## Output when hot


| Condition | Cell temperature | JAM66D46-740/LB | JAM72D30-570/LB/1500V | Retained |
| --- | --- | --- | --- | --- |
| Standard test conditions | 25 °C | 740 W | 570 W | 100.0% of rated power |
| Cool, bright day | 40 °C | 708 W | 540 W | 94.8% of rated power |
| Typical summer roof | 55 °C | 676 W | 510 W | 89.5% of rated power |
| Hot roof | 70 °C | 643 W | 480 W | 84.2% of rated power |


## Against the whole database


| Measure | JAM66D46-740/LB | JAM72D30-570/LB/1500V | Out of | Note |
| --- | --- | --- | --- | --- |
| Efficiency | #433 | #7,958 | 14,005 | JAM66D46-740/LB leads by 7,525 places |
| Power density | #431 | #7,777 | 14,005 | JAM66D46-740/LB leads by 7,346 places |
| Heat behaviour | #2,165 | #10,419 | 14,005 | JAM66D46-740/LB leads by 8,254 places |
| Weight | #4,997 | #11,009 | 14,005 | JAM66D46-740/LB leads by 6,012 places |
| Warranty | #21 | #21 | 14,005 | Tied - the same position in the database |
| Overall | #185 | #5,958 | 14,005 | JAM66D46-740/LB leads by 5,773 places |


## Questions


### Which panel is better: JA Solar JAM66D46-740/LB or JA Solar JAM72D30-570/LB/1500V?

According to our database: **JA Solar JAM66D46-740/LB** has higher module efficiency (**23.80%** vs **21.50%**); **JA Solar JAM66D46-740/LB** tolerates heat better (temp coeff **-0.290%/°C** vs **-0.350%/°C**). See the full spec comparison and 30-year energy simulation above for a complete picture.


### What is the efficiency of JA Solar JAM66D46-740/LB and JA Solar JAM72D30-570/LB/1500V?

**JA Solar JAM66D46-740/LB** has a module efficiency of **23.80%**, while **JA Solar JAM72D30-570/LB/1500V** is **21.50%**. Higher efficiency means more electricity from the same roof area - useful when space is limited.


### What cell technology does JA Solar JAM66D46-740/LB use vs JA Solar JAM72D30-570/LB/1500V?

**JA Solar JAM66D46-740/LB** uses **TOPCon** cells; **JA Solar JAM72D30-570/LB/1500V** uses **PERC**. 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 JAM66D46-740/LB and JA Solar JAM72D30-570/LB/1500V?

**JA Solar JAM66D46-740/LB** has a **30 years** power warranty; **JA Solar JAM72D30-570/LB/1500V** 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 JAM66D46-740/LB and JA Solar JAM72D30-570/LB/1500V bifacial panels?

Both **JA Solar JAM66D46-740/LB** and **JA Solar JAM72D30-570/LB/1500V** 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.


## Related comparisons

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- [JA Solar JAM66D46-740/LB vs JA Solar JAM66D46-715/LB](https://comparepv.com/compare/ja-solar-jam66d46-740-lb/ja-solar-jam66d46-715-lb) - 4 differences, the largest is module efficiency
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Source: https://comparepv.com/compare/ja-solar-jam66d46-740-lb/ja-solar-jam72d30-570-lb-1500v

Not in this file, on the page: the thirty-year yield curve year by year at a cell temperature you pick and a written summary generated on request.