7540A-TR1 vs 7535A-TR1 17 of 18 identical Swap Change panels

First Solar FS-7540A-TR1 vs First Solar FS-7535A-TR1

Q: Which panel is better: First Solar FS-7540A-TR1 or First Solar FS-7535A-TR1?

According to our database: First Solar FS-7540A-TR1 has higher module efficiency (19.30% vs 19.10%). See the full spec comparison and 30-year energy simulation above for a complete picture.

Q: What is the efficiency of First Solar FS-7540A-TR1 and First Solar FS-7535A-TR1?

First Solar FS-7540A-TR1 has a module efficiency of 19.30%, while First Solar FS-7535A-TR1 is 19.10%. Higher efficiency means more electricity from the same roof area - useful when space is limited.

Q: What cell technology does First Solar FS-7540A-TR1 use vs First Solar FS-7535A-TR1?

First Solar FS-7540A-TR1 uses CdTe cells; First Solar FS-7535A-TR1 uses CdTe. Modern n-type technologies (TOPCon, HJT, BC) typically deliver higher efficiency and lower degradation compared to older PERC (p-type) cells.

Q: What is the warranty on First Solar FS-7540A-TR1 and First Solar FS-7535A-TR1?

First Solar FS-7540A-TR1 has a 30 years power warranty; First Solar FS-7535A-TR1 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.

First Solar

FS-7540A-TR1

540 Wp 19.30 % CdTe

Open panel page Datasheet PDF

First Solar

FS-7535A-TR1

535 Wp 19.10 % CdTe

Open panel page Datasheet PDF

The verdict

7540A-TR1 leads on the differences that matter

The largest is module efficiency: 0.20 pp more efficient. 17 of 18 comparable parameters are identical, with 1 more left out because at least one datasheet does not publish it.

See the one difference

How alike are they

17 of 18 comparable
parameters are identical

identical differs not published

What actually differs

1 of 18 parameters

Parameter 7540A-TR1 7535A-TR1 Difference

Module efficiency 19.30 % 19.10 % 0.20 pp more efficient

What it means on a roof

Thirty years of production

Each panel's own declared degradation curve, at 1,200 kWh/kWp a year

Cell temperature

Same temp coeff. for both panels (-0.320 %/°C), so a warmer roof scales both curves by the same factor: the totals fall together and neither panel gains on the other.

7540A-TR1

18,206 kWh

7535A-TR1

18,037 kWh

Lifetime gap

169 kWh

Output when it is hot

Rated power carried across the range a module actually sees

Scenario 7540A-TR1 7535A-TR1

Standard test conditions 25 °C 100.0% of rated power 540 W 535 W

Cool, bright day 40 °C 95.2% of rated power 514 W 509 W

Typical summer roof 55 °C 90.4% of rated power 488 W 484 W

Hot roof 70 °C 85.6% of rated power 462 W 458 W

Full specification

Parameter 7540A-TR1 7535A-TR1 Difference

Power and efficiency

Rated power 540 Wp 535 Wp Effectively the same

Module efficiency 19.30 % 19.10 % +0.20 pp for 7540A-TR1

Power density 193.1 Wp/m² 191.3 Wp/m² Effectively the same

Open-circuit voltage 227.70 V 227.20 V Effectively the same

Voltage at max power 188.70 V 187.80 V Effectively the same

Short-circuit current 3.06 A 3.06 A Same

Current at max power 2.86 A 2.85 A Effectively the same

Temperature

Temperature coefficient -0.320 %/°C -0.320 %/°C Same

Mechanical

Dimensions 2300x1216x49 mm 2300x1216x49 mm Same

Module area 2.797 m² 2.797 m² Same

Weight 39.7 kg 39.7 kg Same

Weight per kWp 73.5 kg/kWp 74.2 kg/kWp Effectively the same

Warranty and degradation

Product warranty 12 yrs 12 yrs Same

Performance warranty 30 yrs 30 yrs Same

Annual degradation 0.30 %/yr 0.30 %/yr Same

Technology

Cell technology CdTe CdTe Same

Cell type Thin film Thin film Same

Cell count - - Neither datasheet publishes this

Bifacial No No Same

Against the whole database

14,129 panels

Efficiency

#12,889 vs #12,993

7540A-TR1 leads by 104 places

Power density

#12,871 vs #12,973

7540A-TR1 leads by 102 places

Heat behaviour

#8,376 vs #8,376

Tied - the same position in the database

Weight

#13,685 vs #13,707

7540A-TR1 leads by 22 places

Warranty

#21 vs #21

Tied - the same position in the database

Overall

#9,831 vs #10,106

7540A-TR1 leads by 275 places

More useful comparisons

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Written summary

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Questions about this pairing

Which panel is better: First Solar FS-7540A-TR1 or First Solar FS-7535A-TR1?

According to our database: First Solar FS-7540A-TR1 has higher module efficiency (19.30% vs 19.10%). See the full spec comparison and 30-year energy simulation above for a complete picture.

What is the efficiency of First Solar FS-7540A-TR1 and First Solar FS-7535A-TR1?

First Solar FS-7540A-TR1 has a module efficiency of 19.30%, while First Solar FS-7535A-TR1 is 19.10%. Higher efficiency means more electricity from the same roof area - useful when space is limited.

What cell technology does First Solar FS-7540A-TR1 use vs First Solar FS-7535A-TR1?

First Solar FS-7540A-TR1 uses CdTe cells; First Solar FS-7535A-TR1 uses CdTe. 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 First Solar FS-7540A-TR1 and First Solar FS-7535A-TR1?

First Solar FS-7540A-TR1 has a 30 years power warranty; First Solar FS-7535A-TR1 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.

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.