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

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

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

Full specification

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

Against the whole database

13,953 panels
Efficiency
#511 vs #4,522
2.1-640 leads by 4,011 places
Power density
#515 vs #4,443
2.1-640 leads by 3,928 places
Heat behaviour
#1,290 vs #511
1.2 FullBlack 270W leads by 779 places
Weight
#4,174 vs #6,643
2.1-640 leads by 2,469 places
Warranty
#21 vs #21
Tied - the same position in the database
Overall
#1,515 vs #10,521
2.1-640 leads by 9,006 places
05

More useful comparisons

Open the full database
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Heckert Solar ZEUS 2.1-640 vs Heckert Solar ZEUS 2.1 635W
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Heckert Solar ZEUS 2.1-640 vs Heckert Solar ZEUS 1.2 FullBlack 280W
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Heckert Solar ZEUS 2.1-640 vs Heckert Solar ZEUS 1.2-280
14 differences, the largest is rated power
Same series, other bin
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Heckert Solar ZEUS 2.1-640 vs Heckert Solar ZEUS 1.2 FullBlack 275W
14 differences, the largest is module efficiency
06

Written summary

07

Questions about this pairing

Which panel is better: Heckert Solar ZEUS 2.1-640 or Heckert Solar ZEUS 1.2 FullBlack 270W?
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 2.1-640 and Heckert Solar ZEUS 1.2 FullBlack 270W?
Heckert Solar ZEUS 2.1-640 has a module efficiency of 23.70%, while Heckert Solar ZEUS 1.2 FullBlack 270 W is 22.47%. Higher efficiency means more electricity from the same roof area - useful when space is limited.
What cell technology does Heckert Solar ZEUS 2.1-640 use vs Heckert Solar ZEUS 1.2 FullBlack 270W?
Heckert Solar ZEUS 2.1-640 uses N-type cells; Heckert Solar ZEUS 1.2 FullBlack 270 W uses Back Contact. 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 2.1-640 and Heckert Solar ZEUS 1.2 FullBlack 270W?
Heckert Solar ZEUS 2.1-640 has a 30 years power warranty; Heckert Solar ZEUS 1.2 FullBlack 270 W 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 2.1-640 and Heckert Solar ZEUS 1.2 FullBlack 270W bifacial panels?
Both Heckert Solar ZEUS 2.1-640 and Heckert Solar ZEUS 1.2 FullBlack 270 W 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.