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

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

Heckert Solar
ZEUS 2.2 710
710 Wp 22.90 % TOPCon Bifacial
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VS
Heckert Solar
ZEUS 2.1 635W
635 Wp 23.50 % 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 2 710 1 635W Difference
Rated power 710 Wp 635 Wp 75 W more power
Module efficiency 22.90 % 23.50 % 0.60 pp more efficient
Weight 37.9 kg 32.5 kg 5.4 kg lighter
Power density 228.6 Wp/m² 235.1 Wp/m² 6.5 Wp/m² higher
Short-circuit current 18.45 A 16.26 A 2.19 A apart
Module area 3.106 m² 2.701 m² 0.405 m² apart
Current at max power 17.45 A 15.40 A 2.05 A apart
Weight per kWp 53.4 kg/kWp 51.2 kg/kWp 2.2 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 635W
20,911 kWh
Lifetime gap
2,470 kWh
Output when it is hot
Rated power carried across the range a module actually sees
Scenario 2 710 1 635W
Standard test conditions 25 °C 100.0% of rated power 710 W 635 W
Cool, bright day 40 °C 95.8% of rated power 680 W 608 W
Typical summer roof 55 °C 91.6% of rated power 650 W 582 W
Hot roof 70 °C 87.4% of rated power 621 W 555 W
03

Full specification

Parameter 2 710 1 635W Difference
Power and efficiency
Rated power 710 Wp 635 Wp +75 W for 2 710
Module efficiency 22.90 % 23.50 % +0.60 pp for 1 635W
Power density 228.6 Wp/m² 235.1 Wp/m² +6.5 Wp/m² for 1 635W
Open-circuit voltage 48.94 V 49.60 V Effectively the same
Voltage at max power 40.69 V 41.24 V Effectively the same
Short-circuit current 18.45 A 16.26 A 2.19 A apart
Current at max power 17.45 A 15.40 A 2.05 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 635W
Weight per kWp 53.4 kg/kWp 51.2 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
#2,329 vs #708
1 635W leads by 1,621 places
Power density
#2,444 vs #731
1 635W leads by 1,713 places
Heat behaviour
#1,290 vs #1,290
Tied - the same position in the database
Weight
#7,229 vs #4,532
1 635W leads by 2,697 places
Warranty
#21 vs #21
Tied - the same position in the database
Overall
#807 vs #1,723
2 710 leads by 916 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 635W?
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 2.2 710 and Heckert Solar ZEUS 2.1 635W?
Heckert Solar ZEUS 2.2 710 has a module efficiency of 22.90%, while Heckert Solar ZEUS 2.1 635 W is 23.50%. 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 635W?
Heckert Solar ZEUS 2.2 710 uses TOPCon cells; Heckert Solar ZEUS 2.1 635 W 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 2.2 710 and Heckert Solar ZEUS 2.1 635W?
Heckert Solar ZEUS 2.2 710 has a 30 years power warranty; Heckert Solar ZEUS 2.1 635 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 2.2 710 and Heckert Solar ZEUS 2.1 635W bifacial panels?
Both Heckert Solar ZEUS 2.2 710 and Heckert Solar ZEUS 2.1 635 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.