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1-635 vs 2 715 10 of 19 identical Swap Change panels

Heckert Solar ZEUS 2.1-635 vs Heckert Solar ZEUS 2.2 715

Heckert Solar
ZEUS 2.1-635
635 Wp 23.50 % N-type Bifacial
Open panel page Datasheet PDF
VS
Heckert Solar ZEUS 2.2 715
Heckert Solar
ZEUS 2.2 715
715 Wp 23.00 % TOPCon Bifacial
Open panel page Datasheet PDF
The verdict

1-635 leads on the differences that matter

The largest is rated power: 80 W more power. 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 1-635 2 715 Difference
Rated power 635 Wp 715 Wp 80 W more power
Module efficiency 23.50 % 23.00 % 0.50 pp more efficient
Weight 32.5 kg 37.9 kg 5.4 kg lighter
Short-circuit current 16.26 A 18.50 A 2.24 A apart
Module area 2.701 m² 3.106 m² 0.405 m² apart
Power density 235.1 Wp/m² 230.2 Wp/m² 4.9 Wp/m² higher
Cell technology N-type TOPCon N-type vs TOPCon
Current at max power 15.40 A 17.50 A 2.10 A apart
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.
1-635
20,911 kWh
2 715
23,546 kWh
Lifetime gap
2,635 kWh
Output when it is hot
Rated power carried across the range a module actually sees
Scenario 1-635 2 715
Standard test conditions 25 °C 100.0% of rated power 635 W 715 W
Cool, bright day 40 °C 95.8% of rated power 608 W 685 W
Typical summer roof 55 °C 91.6% of rated power 582 W 655 W
Hot roof 70 °C 87.4% of rated power 555 W 625 W
03

Full specification

Parameter 1-635 2 715 Difference
Power and efficiency
Rated power 635 Wp 715 Wp +80 W for 2 715
Module efficiency 23.50 % 23.00 % +0.50 pp for 1-635
Power density 235.1 Wp/m² 230.2 Wp/m² +4.9 Wp/m² for 1-635
Open-circuit voltage 49.60 V 49.11 V Effectively the same
Voltage at max power 41.24 V 40.86 V Effectively the same
Short-circuit current 16.26 A 18.50 A 2.24 A apart
Current at max power 15.40 A 17.50 A 2.10 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 1-635
Weight per kWp 51.2 kg/kWp 53.0 kg/kWp Effectively the same
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 N-type TOPCon N-type vs TOPCon
Cell type Monocrystalline Monocrystalline Same
Cell count 132 132 Same
Bifacial Yes Yes Same
04

Against the whole database

14,129 panels
Efficiency
#749 vs #1,970
1-635 leads by 1,221 places
Power density
#777 vs #2,070
1-635 leads by 1,293 places
Heat behaviour
#1,347 vs #1,347
Tied - the same position in the database
Weight
#4,581 vs #6,802
1-635 leads by 2,221 places
Warranty
#21 vs #21
Tied - the same position in the database
Overall
#1,760 vs #691
2 715 leads by 1,069 places
05

More useful comparisons

Open the full database
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14 differences, the largest is rated power
06

Written summary

07

Questions about this pairing

Which panel is better: Heckert Solar ZEUS 2.1-635 or Heckert Solar ZEUS 2.2 715?
According to our database: Heckert Solar ZEUS 2.1-635 has higher module efficiency (23.50% vs 23.00%). See the full spec comparison and 30-year energy simulation above for a complete picture.
What is the efficiency of Heckert Solar ZEUS 2.1-635 and Heckert Solar ZEUS 2.2 715?
Heckert Solar ZEUS 2.1-635 has a module efficiency of 23.50%, while Heckert Solar ZEUS 2.2 715 is 23.00%. Higher efficiency means more electricity from the same roof area - useful when space is limited.
What cell technology does Heckert Solar ZEUS 2.1-635 use vs Heckert Solar ZEUS 2.2 715?
Heckert Solar ZEUS 2.1-635 uses N-type cells; Heckert Solar ZEUS 2.2 715 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 2.1-635 and Heckert Solar ZEUS 2.2 715?
Heckert Solar ZEUS 2.1-635 has a 30 years power warranty; Heckert Solar ZEUS 2.2 715 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 2.1-635 and Heckert Solar ZEUS 2.2 715 bifacial panels?
Both Heckert Solar ZEUS 2.1-635 and Heckert Solar ZEUS 2.2 715 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.