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1 640W vs 2 710 10 of 19 identical Swap Change panels

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

Heckert Solar
ZEUS 2.1 640W
640 Wp 23.70 % TOPCon Bifacial
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VS
Heckert Solar
ZEUS 2.2 710
710 Wp 22.90 % TOPCon Bifacial
Open panel page
The verdict

1 640W leads on the differences that matter

The largest is module efficiency: 0.80 pp more efficient. 10 of 19 comparable parameters are identical.

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

What actually differs

9 of 19 parameters
Parameter 1 640W 2 710 Difference
Module efficiency 23.70 % 22.90 % 0.80 pp more efficient
Rated power 640 Wp 710 Wp 70 W more power
Weight 32.5 kg 37.9 kg 5.4 kg lighter
Power density 236.9 Wp/m² 228.6 Wp/m² 8.4 Wp/m² higher
Short-circuit current 16.33 A 18.45 A 2.12 A apart
Module area 2.701 m² 3.106 m² 0.405 m² apart
Current at max power 15.47 A 17.45 A 1.98 A apart
Weight per kWp 50.8 kg/kWp 53.4 kg/kWp 2.6 kg/kWp lighter
Dimensions 2382x1134x30 mm 2384x1303x33 mm 2382x1134x30 mm vs 2384x1303x33 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.
1 640W
21,076 kWh
2 710
23,381 kWh
Lifetime gap
2,305 kWh
Output when it is hot
Rated power carried across the range a module actually sees
Scenario 1 640W 2 710
Standard test conditions 25 °C 100.0% of rated power 640 W 710 W
Cool, bright day 40 °C 95.8% of rated power 613 W 680 W
Typical summer roof 55 °C 91.6% of rated power 586 W 650 W
Hot roof 70 °C 87.4% of rated power 559 W 621 W
03

Full specification

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

Against the whole database

13,953 panels
Efficiency
#511 vs #2,329
1 640W leads by 1,818 places
Power density
#515 vs #2,444
1 640W leads by 1,929 places
Heat behaviour
#1,290 vs #1,290
Tied - the same position in the database
Weight
#4,174 vs #7,229
1 640W leads by 3,055 places
Warranty
#21 vs #21
Tied - the same position in the database
Overall
#1,515 vs #807
2 710 leads by 708 places
05

More useful comparisons

Open the full database
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06

Written summary

07

Questions about this pairing

Which panel is better: Heckert Solar ZEUS 2.1 640W or Heckert Solar ZEUS 2.2 710?
According to our database: Heckert Solar ZEUS 2.1 640 W 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 2.1 640W and Heckert Solar ZEUS 2.2 710?
Heckert Solar ZEUS 2.1 640 W has a module efficiency of 23.70%, while Heckert Solar ZEUS 2.2 710 is 22.90%. Higher efficiency means more electricity from the same roof area - useful when space is limited.
What cell technology does Heckert Solar ZEUS 2.1 640W use vs Heckert Solar ZEUS 2.2 710?
Heckert Solar ZEUS 2.1 640 W uses TOPCon cells; Heckert Solar ZEUS 2.2 710 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 Heckert Solar ZEUS 2.1 640W and Heckert Solar ZEUS 2.2 710?
Heckert Solar ZEUS 2.1 640 W has a 30 years power warranty; Heckert Solar ZEUS 2.2 710 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 640W and Heckert Solar ZEUS 2.2 710 bifacial panels?
Both Heckert Solar ZEUS 2.1 640 W and Heckert Solar ZEUS 2.2 710 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 15 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.