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2 FullBlack 280W vs 2-275 17 of 19 identical Swap Change panels

Heckert Solar ZEUS 1.2 FullBlack 280W vs Heckert Solar ZEUS 1.2-275

Heckert Solar
ZEUS 1.2 FullBlack 280W
280 Wp 23.31 % Back Contact Bifacial
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VS
Heckert Solar
ZEUS 1.2-275
275 Wp 22.89 % Back Contact Bifacial
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The verdict

2 FullBlack 280W leads on the differences that matter

The largest is module efficiency: 0.42 pp more efficient. 17 of 19 comparable parameters are identical.

See all 2 differences
How alike are they
17 of 19 comparable
parameters are identical
identical differs
01

What actually differs

2 of 19 parameters
Parameter 2 FullBlack 280W 2-275 Difference
Module efficiency 23.31 % 22.89 % 0.42 pp more efficient
Power density 233.1 Wp/m² 228.9 Wp/m² 4.2 Wp/m² higher
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 (-0.260 %/°C), so a warmer roof scales both curves by the same factor: the totals fall together and neither panel gains on the other.
2 FullBlack 280W
9,221 kWh
2-275
9,056 kWh
Lifetime gap
165 kWh
Output when it is hot
Rated power carried across the range a module actually sees
Scenario 2 FullBlack 280W 2-275
Standard test conditions 25 °C 100.0% of rated power 280 W 275 W
Cool, bright day 40 °C 96.1% of rated power 269 W 264 W
Typical summer roof 55 °C 92.2% of rated power 258 W 254 W
Hot roof 70 °C 88.3% of rated power 247 W 243 W
03

Full specification

Parameter 2 FullBlack 280W 2-275 Difference
Power and efficiency
Rated power 280 Wp 275 Wp Effectively the same
Module efficiency 23.31 % 22.89 % +0.42 pp for 2 FullBlack 280W
Power density 233.1 Wp/m² 228.9 Wp/m² +4.2 Wp/m² for 2 FullBlack 280W
Open-circuit voltage 24.11 V 23.89 V Effectively the same
Voltage at max power 20.49 V 20.36 V Effectively the same
Short-circuit current 14.72 A 14.65 A Effectively the same
Current at max power 13.67 A 13.51 A Effectively the same
Temperature
Temperature coefficient -0.260 %/°C -0.260 %/°C Same
Mechanical
Dimensions 1560x770x35 mm 1560x770x35 mm Same
Module area 1.201 m² 1.201 m² Same
Weight 14.3 kg 14.3 kg Same
Weight per kWp 51.1 kg/kWp 52.0 kg/kWp Effectively the same
Warranty and degradation
Product warranty 30 yrs 30 yrs Same
Performance warranty 30 yrs 30 yrs Same
Annual degradation 0.45 %/yr 0.45 %/yr Same
Technology
Cell technology Back Contact Back Contact Same
Cell type Monocrystalline Monocrystalline Same
Cell count 64 64 Same
Bifacial Yes Yes Same
04

Against the whole database

13,953 panels
Efficiency
#1,004 vs #2,490
2 FullBlack 280W leads by 1,486 places
Power density
#1,084 vs #2,404
2 FullBlack 280W leads by 1,320 places
Heat behaviour
#511 vs #511
Tied - the same position in the database
Weight
#4,382 vs #5,386
2 FullBlack 280W leads by 1,004 places
Warranty
#21 vs #21
Tied - the same position in the database
Overall
#9,692 vs #10,137
2 FullBlack 280W leads by 445 places
05

More useful comparisons

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06

Written summary

07

Questions about this pairing

Which panel is better: Heckert Solar ZEUS 1.2 FullBlack 280W or Heckert Solar ZEUS 1.2-275?
According to our database: Heckert Solar ZEUS 1.2 FullBlack 280 W has higher module efficiency (23.31% vs 22.89%). See the full spec comparison and 30-year energy simulation above for a complete picture.
What is the efficiency of Heckert Solar ZEUS 1.2 FullBlack 280W and Heckert Solar ZEUS 1.2-275?
Heckert Solar ZEUS 1.2 FullBlack 280 W has a module efficiency of 23.31%, while Heckert Solar ZEUS 1.2-275 is 22.89%. Higher efficiency means more electricity from the same roof area - useful when space is limited.
What cell technology does Heckert Solar ZEUS 1.2 FullBlack 280W use vs Heckert Solar ZEUS 1.2-275?
Heckert Solar ZEUS 1.2 FullBlack 280 W uses Back Contact cells; Heckert Solar ZEUS 1.2-275 uses Back Contact. 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 1.2 FullBlack 280W and Heckert Solar ZEUS 1.2-275?
Heckert Solar ZEUS 1.2 FullBlack 280 W has a 30 years power warranty; Heckert Solar ZEUS 1.2-275 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 1.2 FullBlack 280W and Heckert Solar ZEUS 1.2-275 bifacial panels?
Both Heckert Solar ZEUS 1.2 FullBlack 280 W and Heckert Solar ZEUS 1.2-275 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.

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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.