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1 635W vs 2 710 10 of 19 identical Swap Change panels

Heckert Solar ZEUS 2.1 635W vs Heckert Solar ZEUS 2.2 710

Heckert Solar
ZEUS 2.1 635W
635 Wp 23.50 % TOPCon Bifacial
Open panel page
VS
Heckert Solar
ZEUS 2.2 710
710 Wp 22.90 % TOPCon Bifacial
Open panel page
The verdict

1 635W leads on the differences that matter

The largest is rated power: 75 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 635W 2 710 Difference
Rated power 635 Wp 710 Wp 75 W more power
Module efficiency 23.50 % 22.90 % 0.60 pp more efficient
Weight 32.5 kg 37.9 kg 5.4 kg lighter
Power density 235.1 Wp/m² 228.6 Wp/m² 6.5 Wp/m² higher
Short-circuit current 16.26 A 18.45 A 2.19 A apart
Module area 2.701 m² 3.106 m² 0.405 m² apart
Current at max power 15.40 A 17.45 A 2.05 A apart
Weight per kWp 51.2 kg/kWp 53.4 kg/kWp 2.2 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 635W
20,911 kWh
2 710
23,381 kWh
Lifetime gap
2,470 kWh
Output when it is hot
Rated power carried across the range a module actually sees
Scenario 1 635W 2 710
Standard test conditions 25 °C 100.0% of rated power 635 W 710 W
Cool, bright day 40 °C 95.8% of rated power 608 W 680 W
Typical summer roof 55 °C 91.6% of rated power 582 W 650 W
Hot roof 70 °C 87.4% of rated power 555 W 621 W
03

Full specification

Parameter 1 635W 2 710 Difference
Power and efficiency
Rated power 635 Wp 710 Wp +75 W for 2 710
Module efficiency 23.50 % 22.90 % +0.60 pp for 1 635W
Power density 235.1 Wp/m² 228.6 Wp/m² +6.5 Wp/m² for 1 635W
Open-circuit voltage 49.60 V 48.94 V Effectively the same
Voltage at max power 41.24 V 40.69 V Effectively the same
Short-circuit current 16.26 A 18.45 A 2.19 A apart
Current at max power 15.40 A 17.45 A 2.05 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 635W
Weight per kWp 51.2 kg/kWp 53.4 kg/kWp -2.2 kg/kWp for 1 635W
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
#708 vs #2,329
1 635W leads by 1,621 places
Power density
#731 vs #2,444
1 635W leads by 1,713 places
Heat behaviour
#1,290 vs #1,290
Tied - the same position in the database
Weight
#4,532 vs #7,229
1 635W leads by 2,697 places
Warranty
#21 vs #21
Tied - the same position in the database
Overall
#1,723 vs #807
2 710 leads by 916 places
05

More useful comparisons

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06

Written summary

07

Questions about this pairing

Which panel is better: Heckert Solar ZEUS 2.1 635W or Heckert Solar ZEUS 2.2 710?
According to our database: Heckert Solar ZEUS 2.1 635 W has higher module efficiency (23.50% 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 635W and Heckert Solar ZEUS 2.2 710?
Heckert Solar ZEUS 2.1 635 W has a module efficiency of 23.50%, 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 635W use vs Heckert Solar ZEUS 2.2 710?
Heckert Solar ZEUS 2.1 635 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 635W and Heckert Solar ZEUS 2.2 710?
Heckert Solar ZEUS 2.1 635 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 635W and Heckert Solar ZEUS 2.2 710 bifacial panels?
Both Heckert Solar ZEUS 2.1 635 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.