---
title: "Q-Cells Q.PEAK DUO ML-G12S.3 / BFG 660 vs Q-Cells Q.TRON S-G3R.12+ / BFG 440 - Solar Panel Comparison | ComparePV"
description: "Compare Q-Cells Q.PEAK DUO ML-G12S.3 / BFG 660 vs Q-Cells Q.TRON S-G3R.12+ / BFG 440 side by side: what actually differs, output when it is hot, thirty-year production, and the full specification."
source: "https://comparepv.com/compare/q-cells-q-peak-duo-ml-g12s-3-bfg-660/q-cells-q-tron-s-g3r-12-bfg-440"
image: "https://comparepv.com/og/compare/panels/q-cells-q-peak-duo-ml-g12s-3-bfg-660/q-cells-q-tron-s-g3r-12-bfg-440.png"
updated: 2026-09-11
---

# Q-Cells Q.PEAK DUO ML-G12S.3 / BFG 660 vs Q-Cells Q.TRON S-G3R.12+ / BFG 440

TRON S-G3R.12+ / BFG 440 leads on the differences that matter

The largest is module efficiency: 0.80 pp more efficient. 3 of 18 comparable parameters are identical, with 1 more left out because at least one datasheet does not publish it.


## The two panels


| Attribute | A | B |
| --- | --- | --- |
| Panel | [Q-Cells Q.PEAK DUO ML-G12S.3 / BFG 660](https://comparepv.com/panel/q-cells-q-peak-duo-ml-g12s-3-bfg-660) | [Q-Cells Q.TRON S-G3R.12+ / BFG 440](https://comparepv.com/panel/q-cells-q-tron-s-g3r-12-bfg-440) |
| Manufacturer | Q-Cells | Q-Cells |
| Power | 660 Wp | 440 Wp |
| Efficiency | 21.20 % | 22.00 % |
| Technology |  | TOPCon |


## Where they differ

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


| Parameter | PEAK DUO ML-G12S.3 / BFG 660 | TRON S-G3R.12+ / BFG 440 | Difference |
| --- | --- | --- | --- |
| Module efficiency | 21.20 % | 22.00 % | +0.80 pp for TRON S-G3R.12+ / BFG 440 |
| Temperature coefficient | -0.340 %/°C | -0.300 %/°C | +0.040 %/°C for TRON S-G3R.12+ / BFG 440 |
| Rated power | 660 Wp | 440 Wp | +220 W for PEAK DUO ML-G12S.3 / BFG 660 |
| Weight | 38.2 kg | 20.9 kg | -17.3 kg for TRON S-G3R.12+ / BFG 440 |
| Weight per kWp | 57.9 kg/kWp | 47.5 kg/kWp | -10.4 kg/kWp for TRON S-G3R.12+ / BFG 440 |
| Product warranty | 12 yrs | 25 yrs | +13 yrs for TRON S-G3R.12+ / BFG 440 |
| Power density | 212.5 Wp/m² | 220.2 Wp/m² | +7.7 Wp/m² for TRON S-G3R.12+ / BFG 440 |
| Annual degradation | 0.45 %/yr | 0.33 %/yr | -0.12 %/yr for TRON S-G3R.12+ / BFG 440 |
| Open-circuit voltage | 45.68 V | 34.67 V | 11.01 V apart |
| Short-circuit current | 18.36 A | 15.95 A | 2.41 A apart |
| Module area | 3.106 m² | 1.998 m² | 1.108 m² apart |
| Voltage at max power | 37.94 V | 29.72 V | 8.22 V apart |
| Current at max power | 17.39 A | 14.81 A | 2.58 A apart |
| Cell count | 132 | 96 | 36 cells apart |
| Dimensions | 2384x1303x35 mm | 1762x1134x30 mm | 2384x1303x35 mm vs 1762x1134x30 mm |


## Every compared parameter


| Parameter | PEAK DUO ML-G12S.3 / BFG 660 | TRON S-G3R.12+ / BFG 440 |
| --- | --- | --- |
| Rated power | 660 Wp | 440 Wp |
| Module efficiency | 21.20 % | 22.00 % |
| Power density | 212.5 Wp/m² | 220.2 Wp/m² |
| Open-circuit voltage | 45.68 V | 34.67 V |
| Voltage at max power | 37.94 V | 29.72 V |
| Short-circuit current | 18.36 A | 15.95 A |
| Current at max power | 17.39 A | 14.81 A |
| Temperature coefficient | -0.340 %/°C | -0.300 %/°C |
| Dimensions | 2384x1303x35 mm | 1762x1134x30 mm |
| Module area | 3.106 m² | 1.998 m² |
| Weight | 38.2 kg | 20.9 kg |
| Weight per kWp | 57.9 kg/kWp | 47.5 kg/kWp |
| Product warranty | 12 yrs | 25 yrs |
| Performance warranty | 30 yrs | 30 yrs |
| Annual degradation | 0.45 %/yr | 0.33 %/yr |
| Cell technology | - | TOPCon |
| Cell type | Monocrystalline | Monocrystalline |
| Cell count | 132 | 96 |
| Bifacial | Yes | Yes |


## Thirty-year yield

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

- **Cumulative output, PEAK DUO ML-G12S.3 / BFG 660:** 21,734 kWh
- **Cumulative output, TRON S-G3R.12+ / BFG 440:** 14,844 kWh
- **Gap:** 6,890 kWh


## Output when hot


| Condition | Cell temperature | PEAK DUO ML-G12S.3 / BFG 660 | TRON S-G3R.12+ / BFG 440 | Retained |
| --- | --- | --- | --- | --- |
| Standard test conditions | 25 °C | 660 W | 440 W | 100.0% of rated power |
| Cool, bright day | 40 °C | 626 W | 420 W | 94.9% of rated power |
| Typical summer roof | 55 °C | 593 W | 400 W | 89.8% of rated power |
| Hot roof | 70 °C | 559 W | 381 W | 84.7% of rated power |


## Against the whole database


| Measure | PEAK DUO ML-G12S.3 / BFG 660 | TRON S-G3R.12+ / BFG 440 | Out of | Note |
| --- | --- | --- | --- | --- |
| Efficiency | #9,145 | #6,580 | 14,129 | TRON S-G3R.12+ / BFG 440 leads by 2,565 places |
| Power density | #9,028 | #6,391 | 14,129 | TRON S-G3R.12+ / BFG 440 leads by 2,637 places |
| Heat behaviour | #8,846 | #6,152 | 14,129 | TRON S-G3R.12+ / BFG 440 leads by 2,694 places |
| Weight | #11,554 | #1,726 | 14,129 | TRON S-G3R.12+ / BFG 440 leads by 9,828 places |
| Warranty | #21 | #21 | 14,129 | Tied - the same position in the database |
| Overall | #3,269 | #7,117 | 14,129 | PEAK DUO ML-G12S.3 / BFG 660 leads by 3,848 places |


## Questions


### Which panel is better: Q-Cells Q.PEAK DUO ML-G12S.3 / BFG 660 or Q-Cells Q.TRON S-G3R.12+ / BFG 440?

According to our database: **Q-Cells Q.TRON S-G3R.12+ / BFG 440** has higher module efficiency (**22.00%** vs **21.20%**); **Q-Cells Q.TRON S-G3R.12+ / BFG 440** tolerates heat better (temp coeff **-0.300%/°C** vs **-0.340%/°C**). See the full spec comparison and 30-year energy simulation above for a complete picture.


### What is the efficiency of Q-Cells Q.PEAK DUO ML-G12S.3 / BFG 660 and Q-Cells Q.TRON S-G3R.12+ / BFG 440?

**Q-Cells Q.PEAK DUO ML-G12S.3 / BFG 660** has a module efficiency of **21.20%**, while **Q-Cells Q.TRON S-G3R.12+ / BFG 440** is **22.00%**. Higher efficiency means more electricity from the same roof area - useful when space is limited.


### What cell technology does Q-Cells Q.PEAK DUO ML-G12S.3 / BFG 660 use vs Q-Cells Q.TRON S-G3R.12+ / BFG 440?

**Q-Cells Q.PEAK DUO ML-G12S.3 / BFG 660** uses Monocrystalline cells; **Q-Cells Q.TRON S-G3R.12+ / BFG 440** 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 Q-Cells Q.PEAK DUO ML-G12S.3 / BFG 660 and Q-Cells Q.TRON S-G3R.12+ / BFG 440?

**Q-Cells Q.PEAK DUO ML-G12S.3 / BFG 660** has a **30 years** power warranty; **Q-Cells Q.TRON S-G3R.12+ / BFG 440** 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 Q-Cells Q.PEAK DUO ML-G12S.3 / BFG 660 and Q-Cells Q.TRON S-G3R.12+ / BFG 440 bifacial panels?

Both **Q-Cells Q.PEAK DUO ML-G12S.3 / BFG 660** and **Q-Cells Q.TRON S-G3R.12+ / BFG 440** 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

- [Q-Cells Q.PEAK DUO ML-G12S.3 / BFG 660 vs Q-Cells Q.PEAK DUO ML-G12S.3 / BFG 675](https://comparepv.com/compare/q-cells-q-peak-duo-ml-g12s-3-bfg-660/q-cells-q-peak-duo-ml-g12s-3-bfg-675) - 3 differences, the largest is module efficiency
- [Q-Cells Q.PEAK DUO ML-G12S.3 / BFG 660 vs Q-Cells Q.PEAK DUO ML-G12S.3 / BFG 670](https://comparepv.com/compare/q-cells-q-peak-duo-ml-g12s-3-bfg-660/q-cells-q-peak-duo-ml-g12s-3-bfg-670) - 3 differences, the largest is module efficiency
- [Q-Cells Q.PEAK DUO ML-G12S.3 / BFG 660 vs Q-Cells Q.PEAK DUO ML-G12S.3 / BFG 665](https://comparepv.com/compare/q-cells-q-peak-duo-ml-g12s-3-bfg-660/q-cells-q-peak-duo-ml-g12s-3-bfg-665) - One difference: module efficiency
- [Q-Cells Q.PEAK DUO ML-G12S.3 / BFG 660 vs Q-Cells Q.PEAK DUO ML-G12S.3 / BFG 655](https://comparepv.com/compare/q-cells-q-peak-duo-ml-g12s-3-bfg-660/q-cells-q-peak-duo-ml-g12s-3-bfg-655) - The same specification on paper
- [Q-Cells Q.PEAK DUO ML-G12S.3 / BFG 660 vs Q-Cells Q.PEAK DUO ML-G12S.3 / BFG 650](https://comparepv.com/compare/q-cells-q-peak-duo-ml-g12s-3-bfg-660/q-cells-q-peak-duo-ml-g12s-3-bfg-650) - 3 differences, the largest is module efficiency
- [Q-Cells Q.TRON S-G3R.12+ / BFG 440 vs Q-Cells Q.TRON S-G3R.12+ / BFG 450](https://comparepv.com/compare/q-cells-q-tron-s-g3r-12-bfg-440/q-cells-q-tron-s-g3r-12-bfg-450) - 3 differences, the largest is module efficiency


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Source: https://comparepv.com/compare/q-cells-q-peak-duo-ml-g12s-3-bfg-660/q-cells-q-tron-s-g3r-12-bfg-440

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.