G2.1+/AC (Power class 420W) vs G2+/AC (Power class 415W) 18 of 19 identical Swap Change panels

Q-Cells Q.TRON BLK M-G2.1+/AC (Power class 420W) vs Q-Cells Q.TRON BLK M-G2+/AC (Power class 415W)

Q: Which panel is better: Q-Cells Q.TRON BLK M-G2.1+/AC (Power class 420W) or Q-Cells Q.TRON BLK M-G2+/AC (Power class 415W)?

According to our database: Q-Cells Q.TRON BLK M-G2.1+/AC (Power class 420W) has higher module efficiency (21.50% vs 21.30%). See the full spec comparison and 30-year energy simulation above for a complete picture.

Q: What is the efficiency of Q-Cells Q.TRON BLK M-G2.1+/AC (Power class 420W) and Q-Cells Q.TRON BLK M-G2+/AC (Power class 415W)?

Q-Cells Q.TRON BLK M-G2.1+/AC (Power class 420W) has a module efficiency of 21.50%, while Q-Cells Q.TRON BLK M-G2+/AC (Power class 415W) is 21.30%. Higher efficiency means more electricity from the same roof area - useful when space is limited.

Q: What cell technology does Q-Cells Q.TRON BLK M-G2.1+/AC (Power class 420W) use vs Q-Cells Q.TRON BLK M-G2+/AC (Power class 415W)?

Q-Cells Q.TRON BLK M-G2.1+/AC (Power class 420W) uses N-type cells; Q-Cells Q.TRON BLK M-G2+/AC (Power class 415W) uses N-type. 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 Q-Cells Q.TRON BLK M-G2.1+/AC (Power class 420W) and Q-Cells Q.TRON BLK M-G2+/AC (Power class 415W)?

Q-Cells Q.TRON BLK M-G2.1+/AC (Power class 420W) has a 25 years power warranty; Q-Cells Q.TRON BLK M-G2+/AC (Power class 415W) has a 25 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.TRON BLK M-G2.1+/AC (Power class 420W)

420 Wp 21.50 % N-type

Open panel page Datasheet PDF

Q.TRON BLK M-G2+/AC (Power class 415W)

415 Wp 21.30 % N-type

Open panel page Datasheet PDF

The verdict

G2.1+/AC (Power class 420W) leads on the differences that matter

The largest is module efficiency: 0.20 pp more efficient. 18 of 19 comparable parameters are identical.

See the one difference

How alike are they

18 of 19 comparable
parameters are identical

identical differs

What actually differs

1 of 19 parameters

Parameter G2.1+/AC (Power class 420W) G2+/AC (Power class 415W) Difference

Module efficiency 21.50 % 21.30 % 0.20 pp more efficient

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

Same temp coeff. for both panels (-0.300 %/°C), so a warmer roof scales both curves by the same factor: the totals fall together and neither panel gains on the other.

G2.1+/AC (Power class 420W)

14,170 kWh

G2+/AC (Power class 415W)

14,001 kWh

Lifetime gap

169 kWh

Output when it is hot

Rated power carried across the range a module actually sees

Scenario G2.1+/AC (Power class 420W) G2+/AC (Power class 415W)

Standard test conditions 25 °C 100.0% of rated power 420 W 415 W

Cool, bright day 40 °C 95.5% of rated power 401 W 396 W

Typical summer roof 55 °C 91.0% of rated power 382 W 378 W

Hot roof 70 °C 86.5% of rated power 363 W 359 W

Full specification

Parameter G2.1+/AC (Power class 420W) G2+/AC (Power class 415W) Difference

Power and efficiency

Rated power 420 Wp 415 Wp Effectively the same

Module efficiency 21.50 % 21.30 % +0.20 pp for G2.1+/AC (Power class 420W)

Power density 215.1 Wp/m² 212.5 Wp/m² Effectively the same

Open-circuit voltage 38.75 V 38.47 V Effectively the same

Voltage at max power 32.54 V 32.34 V Effectively the same

Short-circuit current 13.58 A 13.49 A Effectively the same

Current at max power 12.91 A 12.83 A Effectively the same

Temperature

Temperature coefficient -0.300 %/°C -0.300 %/°C Same

Mechanical

Dimensions 1722x1134x40 mm 1722x1134x40 mm Same

Module area 1.953 m² 1.953 m² Same

Weight 22.9 kg 22.9 kg Same

Weight per kWp 54.6 kg/kWp 55.3 kg/kWp Effectively the same

Warranty and degradation

Product warranty 25 yrs 25 yrs Same

Performance warranty 25 yrs 25 yrs Same

Annual degradation 0.33 %/yr 0.33 %/yr Same

Technology

Cell technology N-type N-type Same

Cell type Monocrystalline Monocrystalline Same

Cell count 216 216 Same

Bifacial No No Same

Against the whole database

14,005 panels

Efficiency

#7,958 vs #8,519

G2.1+/AC (Power class 420W) leads by 561 places

Power density

#7,882 vs #8,791

G2.1+/AC (Power class 420W) leads by 909 places

Heat behaviour

#6,093 vs #6,093

Tied - the same position in the database

Weight

#9,019 vs #9,763

G2.1+/AC (Power class 420W) leads by 744 places

Warranty

#9,798 vs #9,798

Tied - the same position in the database

Overall

#9,518 vs #9,847

G2.1+/AC (Power class 420W) leads by 329 places

More useful comparisons

Open the full database

Same series, other bin

Q-Cells Q.TRON BLK M-G2.1+/AC (Power class 420W) vs Q-Cells Q.TRON BLK M-G2.H1+/AC (Power class 440W)

5 differences, the largest is module efficiency

Same series, other bin

Q-Cells Q.TRON BLK M-G2.1+/AC (Power class 420W) vs Q-Cells Q.TRON BLK M-G2.D1+/AC (Power class 435W)

3 differences, the largest is module efficiency

Same series, other bin

Q-Cells Q.TRON BLK M-G2.1+/AC (Power class 420W) vs Q-Cells Q.TRON BLK M-G2.C1+/AC (Power class 430W)

3 differences, the largest is module efficiency

Same series, other bin

Q-Cells Q.TRON BLK M-G2.1+/AC (Power class 420W) vs Q-Cells Q.TRON BLK M-G2.E1+/AC (Power class 425W)

One difference: module efficiency

Same manufacturer

Q-Cells Q.TRON BLK M-G2.1+/AC (Power class 420W) vs Q-Cells Q.PEAK DUO ML-G12S.3 / BFG 675

15 differences, the largest is temperature coefficient

Same manufacturer

Q-Cells Q.TRON BLK M-G2.1+/AC (Power class 420W) vs Q-Cells Q.PEAK DUO ML-G12S.3 / BFG 670

15 differences, the largest is temperature coefficient

Written summary

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Questions about this pairing

Which panel is better: Q-Cells Q.TRON BLK M-G2.1+/AC (Power class 420W) or Q-Cells Q.TRON BLK M-G2+/AC (Power class 415W)?

According to our database: Q-Cells Q.TRON BLK M-G2.1+/AC (Power class 420 W) has higher module efficiency (21.50% vs 21.30%). See the full spec comparison and 30-year energy simulation above for a complete picture.

What is the efficiency of Q-Cells Q.TRON BLK M-G2.1+/AC (Power class 420W) and Q-Cells Q.TRON BLK M-G2+/AC (Power class 415W)?

Q-Cells Q.TRON BLK M-G2.1+/AC (Power class 420 W) has a module efficiency of 21.50%, while Q-Cells Q.TRON BLK M-G2+/AC (Power class 415 W) is 21.30%. Higher efficiency means more electricity from the same roof area - useful when space is limited.

What cell technology does Q-Cells Q.TRON BLK M-G2.1+/AC (Power class 420W) use vs Q-Cells Q.TRON BLK M-G2+/AC (Power class 415W)?

Q-Cells Q.TRON BLK M-G2.1+/AC (Power class 420 W) uses N-type cells; Q-Cells Q.TRON BLK M-G2+/AC (Power class 415 W) uses N-type. 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.TRON BLK M-G2.1+/AC (Power class 420W) and Q-Cells Q.TRON BLK M-G2+/AC (Power class 415W)?

Q-Cells Q.TRON BLK M-G2.1+/AC (Power class 420 W) has a 25 years power warranty; Q-Cells Q.TRON BLK M-G2+/AC (Power class 415 W) has a 25 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.

Shop prices: See 20 Q-Cells 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.