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1.2 FullBlack 270W vs 2.1-640 4 of 19 identical Swap Change panels

Heckert Solar ZEUS 1.2 FullBlack 270W vs Heckert Solar ZEUS 2.1-640

Heckert Solar
ZEUS 1.2 FullBlack 270W
270 Wp 22.47 % Back Contact Bifacial
Open panel page Datasheet PDF
VS
Heckert Solar
ZEUS 2.1-640
640 Wp 23.70 % N-type Bifacial
Open panel page Datasheet PDF
The verdict

2.1-640 leads on the differences that matter

The largest is module efficiency: 1.23 pp more efficient. 4 of 19 comparable parameters are identical.

See all 15 differences
How alike are they
4 of 19 comparable
parameters are identical
identical differs
01

What actually differs

15 of 19 parameters
Parameter 1.2 FullBlack 270W 2.1-640 Difference
Module efficiency 22.47 % 23.70 % 1.23 pp more efficient
Rated power 270 Wp 640 Wp 370 W more power
Power density 224.8 Wp/m² 236.9 Wp/m² 12.2 Wp/m² higher
Weight 14.3 kg 32.5 kg 18.2 kg lighter
Product warranty 30 yrs 12 yrs 18 yrs longer
Temperature coefficient -0.260 %/°C -0.280 %/°C 0.020 %/°C better in heat
Open-circuit voltage 23.67 V 49.75 V 26.08 V apart
Module area 1.201 m² 2.701 m² 1.500 m² apart
Short-circuit current 14.58 A 16.33 A 1.75 A apart
Cell technology Back Contact N-type Back Contact vs N-type
Voltage at max power 20.23 V 41.38 V 21.15 V apart
Current at max power 13.35 A 15.47 A 2.12 A apart
Cell count 64 132 68 cells apart
Weight per kWp 53.0 kg/kWp 50.8 kg/kWp 2.2 kg/kWp lighter
Dimensions 1560x770x35 mm 2382x1134x30 mm 1560x770x35 mm vs 2382x1134x30 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
1.2 FullBlack 270W
8,891 kWh
2.1-640
21,076 kWh
Lifetime gap
12,185 kWh
Output when it is hot
Rated power carried across the range a module actually sees
Scenario 1.2 FullBlack 270W 2.1-640
Standard test conditions 25 °C 100.0% of rated power 270 W 640 W
Cool, bright day 40 °C 95.8% of rated power 259 W 613 W
Typical summer roof 55 °C 91.6% of rated power 249 W 586 W
Hot roof 70 °C 87.4% of rated power 238 W 559 W
03

Full specification

Parameter 1.2 FullBlack 270W 2.1-640 Difference
Power and efficiency
Rated power 270 Wp 640 Wp +370 W for 2.1-640
Module efficiency 22.47 % 23.70 % +1.23 pp for 2.1-640
Power density 224.8 Wp/m² 236.9 Wp/m² +12.2 Wp/m² for 2.1-640
Open-circuit voltage 23.67 V 49.75 V 26.08 V apart
Voltage at max power 20.23 V 41.38 V 21.15 V apart
Short-circuit current 14.58 A 16.33 A 1.75 A apart
Current at max power 13.35 A 15.47 A 2.12 A apart
Temperature
Temperature coefficient -0.260 %/°C -0.280 %/°C +0.020 %/°C for 1.2 FullBlack 270W
Mechanical
Dimensions 1560x770x35 mm 2382x1134x30 mm 1560x770x35 mm vs 2382x1134x30 mm
Module area 1.201 m² 2.701 m² 1.500 m² apart
Weight 14.3 kg 32.5 kg -18.2 kg for 1.2 FullBlack 270W
Weight per kWp 53.0 kg/kWp 50.8 kg/kWp -2.2 kg/kWp for 2.1-640
Warranty and degradation
Product warranty 30 yrs 12 yrs +18 yrs for 1.2 FullBlack 270W
Performance warranty 30 yrs 30 yrs Same
Annual degradation 0.45 %/yr 0.45 %/yr Same
Technology
Cell technology Back Contact N-type Back Contact vs N-type
Cell type Monocrystalline Monocrystalline Same
Cell count 64 132 68 cells apart
Bifacial Yes Yes Same
04

Against the whole database

14,129 panels
Efficiency
#4,636 vs #549
2.1-640 leads by 4,087 places
Power density
#4,557 vs #553
2.1-640 leads by 4,004 places
Heat behaviour
#515 vs #1,347
1.2 FullBlack 270W leads by 832 places
Weight
#6,740 vs #4,218
2.1-640 leads by 2,522 places
Warranty
#21 vs #21
Tied - the same position in the database
Overall
#10,664 vs #1,545
2.1-640 leads by 9,119 places
05

More useful comparisons

Open the full database
Same series, other bin
Heckert Solar
Heckert Solar ZEUS 1.2 FullBlack 270W vs Heckert Solar ZEUS 1.2 FullBlack 280W
3 differences, the largest is module efficiency
Same series, other bin
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Heckert Solar ZEUS 1.2 FullBlack 270W vs Heckert Solar ZEUS 1.2 FullBlack 275W
2 differences, the largest is module efficiency
Same series, other bin
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Heckert Solar ZEUS 2.1-640 vs Heckert Solar ZEUS 2.1 640W
One difference: cell technology
Same series, other bin
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Heckert Solar ZEUS 2.1-640 vs Heckert Solar ZEUS 2.1-635
One difference: module efficiency
Same series, other bin
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Heckert Solar ZEUS 2.1-640 vs Heckert Solar ZEUS 2.1 635W
2 differences, the largest is cell technology
Same series, other bin
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Heckert Solar ZEUS 2.1-640 vs Heckert Solar ZEUS 1.2-280
14 differences, the largest is rated power
06

Written summary

07

Questions about this pairing

Which panel is better: Heckert Solar ZEUS 1.2 FullBlack 270W or Heckert Solar ZEUS 2.1-640?
According to our database: Heckert Solar ZEUS 2.1-640 has higher module efficiency (23.70% vs 22.47%); Heckert Solar ZEUS 1.2 FullBlack 270 W tolerates heat better (temp coeff -0.260%/°C vs -0.280%/°C). See the full spec comparison and 30-year energy simulation above for a complete picture.
What is the efficiency of Heckert Solar ZEUS 1.2 FullBlack 270W and Heckert Solar ZEUS 2.1-640?
Heckert Solar ZEUS 1.2 FullBlack 270 W has a module efficiency of 22.47%, while Heckert Solar ZEUS 2.1-640 is 23.70%. Higher efficiency means more electricity from the same roof area - useful when space is limited.
What cell technology does Heckert Solar ZEUS 1.2 FullBlack 270W use vs Heckert Solar ZEUS 2.1-640?
Heckert Solar ZEUS 1.2 FullBlack 270 W uses Back Contact cells; Heckert Solar ZEUS 2.1-640 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 Heckert Solar ZEUS 1.2 FullBlack 270W and Heckert Solar ZEUS 2.1-640?
Heckert Solar ZEUS 1.2 FullBlack 270 W has a 30 years power warranty; Heckert Solar ZEUS 2.1-640 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 Heckert Solar ZEUS 1.2 FullBlack 270W and Heckert Solar ZEUS 2.1-640 bifacial panels?
Both Heckert Solar ZEUS 1.2 FullBlack 270 W and Heckert Solar ZEUS 2.1-640 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 16 Heckert 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.