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2-710 vs 1-640 9 of 19 identical Swap Change panels

Heckert Solar ZEUS 2.2-710 vs Heckert Solar ZEUS 2.1-640

Heckert Solar ZEUS 2.2-710
Heckert Solar
ZEUS 2.2-710
710 Wp 22.90 % TOPCon 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

1-640 leads on the differences that matter

The largest is module efficiency: 0.80 pp more efficient. 9 of 19 comparable parameters are identical.

See all 10 differences
How alike are they
9 of 19 comparable
parameters are identical
identical differs
01

What actually differs

10 of 19 parameters
Parameter 2-710 1-640 Difference
Module efficiency 22.90 % 23.70 % 0.80 pp more efficient
Rated power 710 Wp 640 Wp 70 W more power
Weight 37.9 kg 32.5 kg 5.4 kg lighter
Power density 228.6 Wp/m² 236.9 Wp/m² 8.4 Wp/m² higher
Short-circuit current 18.45 A 16.33 A 2.12 A apart
Module area 3.106 m² 2.701 m² 0.405 m² apart
Cell technology TOPCon N-type TOPCon vs N-type
Current at max power 17.45 A 15.47 A 1.98 A apart
Weight per kWp 53.4 kg/kWp 50.8 kg/kWp 2.6 kg/kWp lighter
Dimensions 2384x1303x33 mm 2382x1134x30 mm 2384x1303x33 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
Same temp coeff. for both panels (-0.280 %/°C), so a warmer roof scales both curves by the same factor: the totals fall together and neither panel gains on the other.
2-710
23,381 kWh
1-640
21,076 kWh
Lifetime gap
2,305 kWh
Output when it is hot
Rated power carried across the range a module actually sees
Scenario 2-710 1-640
Standard test conditions 25 °C 100.0% of rated power 710 W 640 W
Cool, bright day 40 °C 95.8% of rated power 680 W 613 W
Typical summer roof 55 °C 91.6% of rated power 650 W 586 W
Hot roof 70 °C 87.4% of rated power 621 W 559 W
03

Full specification

Parameter 2-710 1-640 Difference
Power and efficiency
Rated power 710 Wp 640 Wp +70 W for 2-710
Module efficiency 22.90 % 23.70 % +0.80 pp for 1-640
Power density 228.6 Wp/m² 236.9 Wp/m² +8.4 Wp/m² for 1-640
Open-circuit voltage 48.94 V 49.75 V Effectively the same
Voltage at max power 40.69 V 41.38 V Effectively the same
Short-circuit current 18.45 A 16.33 A 2.12 A apart
Current at max power 17.45 A 15.47 A 1.98 A apart
Temperature
Temperature coefficient -0.280 %/°C -0.280 %/°C Same
Mechanical
Dimensions 2384x1303x33 mm 2382x1134x30 mm 2384x1303x33 mm vs 2382x1134x30 mm
Module area 3.106 m² 2.701 m² 0.405 m² apart
Weight 37.9 kg 32.5 kg -5.4 kg for 1-640
Weight per kWp 53.4 kg/kWp 50.8 kg/kWp -2.6 kg/kWp for 1-640
Warranty and degradation
Product warranty 12 yrs 12 yrs Same
Performance warranty 30 yrs 30 yrs Same
Annual degradation 0.45 %/yr 0.45 %/yr Same
Technology
Cell technology TOPCon N-type TOPCon vs N-type
Cell type Monocrystalline Monocrystalline Same
Cell count 132 132 Same
Bifacial Yes Yes Same
04

Against the whole database

14,129 panels
Efficiency
#2,412 vs #549
1-640 leads by 1,863 places
Power density
#2,529 vs #553
1-640 leads by 1,976 places
Heat behaviour
#1,347 vs #1,347
Tied - the same position in the database
Weight
#7,339 vs #4,218
1-640 leads by 3,121 places
Warranty
#21 vs #21
Tied - the same position in the database
Overall
#830 vs #1,545
2-710 leads by 715 places
05

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06

Written summary

07

Questions about this pairing

Which panel is better: Heckert Solar ZEUS 2.2-710 or Heckert Solar ZEUS 2.1-640?
According to our database: Heckert Solar ZEUS 2.1-640 has higher module efficiency (23.70% vs 22.90%). See the full spec comparison and 30-year energy simulation above for a complete picture.
What is the efficiency of Heckert Solar ZEUS 2.2-710 and Heckert Solar ZEUS 2.1-640?
Heckert Solar ZEUS 2.2-710 has a module efficiency of 22.90%, 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 2.2-710 use vs Heckert Solar ZEUS 2.1-640?
Heckert Solar ZEUS 2.2-710 uses TOPCon 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 2.2-710 and Heckert Solar ZEUS 2.1-640?
Heckert Solar ZEUS 2.2-710 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 2.2-710 and Heckert Solar ZEUS 2.1-640 bifacial panels?
Both Heckert Solar ZEUS 2.2-710 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.