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TP540HG10TB vs TP642LG10B 3 of 19 identical Swap Change panels

Tata Power Solar TP540HG10TB vs Tata Power Solar TP642LG10B

Tata Power Solar
TP540HG10TB
540 Wp 20.90 % PERC Bifacial
Open panel page Datasheet PDF
VS
Tata Power Solar TP642LG10B
Tata Power Solar
TP642LG10B
642 Wp 23.05 % PERC Bifacial
Open panel page Datasheet PDF
The verdict

TP642LG10B leads on the differences that matter

The largest is module efficiency: 2.15 pp more efficient. 3 of 19 comparable parameters are identical.

See all 16 differences
How alike are they
3 of 19 comparable
parameters are identical
identical differs
01

What actually differs

16 of 19 parameters
Parameter TP540HG10TB TP642LG10B Difference
Module efficiency 20.90 % 23.05 % 2.15 pp more efficient
Rated power 540 Wp 642 Wp 102 W more power
Power density 209.0 Wp/m² 230.5 Wp/m² 21.5 Wp/m² higher
Performance warranty 25 yrs 30 yrs 5 yrs longer
Weight 29.0 kg 36.0 kg 7.0 kg lighter
Annual degradation 0.72 %/yr 0.60 %/yr 0.12 %/yr slower
Open-circuit voltage 49.50 V 55.00 V 5.50 V apart
Module area 2.583 m² 2.785 m² 0.202 m² apart
Product warranty 10 yrs 12 yrs 2 yrs longer
Temperature coefficient -0.360 %/°C -0.370 %/°C 0.010 %/°C better in heat
Voltage at max power 42.45 V 47.28 V 4.83 V apart
Cell count 144 156 12 cells apart
Weight per kWp 53.7 kg/kWp 56.1 kg/kWp 2.4 kg/kWp lighter
Short-circuit current 13.23 A 14.01 A 0.78 A apart
Dimensions 2278x1134x35 mm 2456x1134x35 mm 2278x1134x35 mm vs 2456x1134x35 mm
Current at max power 12.72 A 13.58 A 0.86 A apart
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
TP540HG10TB
16,924 kWh
TP642LG10B
20,523 kWh
Lifetime gap
3,599 kWh
Output when it is hot
Rated power carried across the range a module actually sees
Scenario TP540HG10TB TP642LG10B
Standard test conditions 25 °C 100.0% of rated power 540 W 642 W
Cool, bright day 40 °C 94.5% of rated power 511 W 606 W
Typical summer roof 55 °C 88.9% of rated power 482 W 571 W
Hot roof 70 °C 83.3% of rated power 453 W 535 W
03

Full specification

Parameter TP540HG10TB TP642LG10B Difference
Power and efficiency
Rated power 540 Wp 642 Wp +102 W for TP642LG10B
Module efficiency 20.90 % 23.05 % +2.15 pp for TP642LG10B
Power density 209.0 Wp/m² 230.5 Wp/m² +21.5 Wp/m² for TP642LG10B
Open-circuit voltage 49.50 V 55.00 V 5.50 V apart
Voltage at max power 42.45 V 47.28 V 4.83 V apart
Short-circuit current 13.23 A 14.01 A 0.78 A apart
Current at max power 12.72 A 13.58 A 0.86 A apart
Temperature
Temperature coefficient -0.360 %/°C -0.370 %/°C +0.010 %/°C for TP540HG10TB
Mechanical
Dimensions 2278x1134x35 mm 2456x1134x35 mm 2278x1134x35 mm vs 2456x1134x35 mm
Module area 2.583 m² 2.785 m² 0.202 m² apart
Weight 29.0 kg 36.0 kg -7.0 kg for TP540HG10TB
Weight per kWp 53.7 kg/kWp 56.1 kg/kWp -2.4 kg/kWp for TP540HG10TB
Warranty and degradation
Product warranty 10 yrs 12 yrs +2 yrs for TP642LG10B
Performance warranty 25 yrs 30 yrs +5 yrs for TP642LG10B
Annual degradation 0.72 %/yr 0.60 %/yr -0.12 %/yr for TP642LG10B
Technology
Cell technology PERC PERC Same
Cell type Monocrystalline Monocrystalline Same
Cell count 144 156 12 cells apart
Bifacial Yes Yes Same
04

Against the whole database

14,005 panels
Efficiency
#10,072 vs #1,700
TP642LG10B leads by 8,372 places
Power density
#10,100 vs #1,701
TP642LG10B leads by 8,399 places
Heat behaviour
#12,345 vs #13,081
TP540HG10TB leads by 736 places
Weight
#7,707 vs #10,369
TP540HG10TB leads by 2,662 places
Warranty
#9,798 vs #21
TP642LG10B leads by 9,777 places
Overall
#9,325 vs #1,920
TP642LG10B leads by 7,405 places
05

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06

Written summary

07

Questions about this pairing

Which panel is better: Tata Power Solar TP540HG10TB or Tata Power Solar TP642LG10B?
According to our database: Tata Power Solar TP642LG10B has higher module efficiency (23.05% vs 20.90%); Tata Power Solar TP540HG10TB tolerates heat better (temp coeff -0.360%/°C vs -0.370%/°C). See the full spec comparison and 30-year energy simulation above for a complete picture.
What is the efficiency of Tata Power Solar TP540HG10TB and Tata Power Solar TP642LG10B?
Tata Power Solar TP540HG10TB has a module efficiency of 20.90%, while Tata Power Solar TP642LG10B is 23.05%. Higher efficiency means more electricity from the same roof area - useful when space is limited.
What cell technology does Tata Power Solar TP540HG10TB use vs Tata Power Solar TP642LG10B?
Tata Power Solar TP540HG10TB uses PERC cells; Tata Power Solar TP642LG10B uses PERC. 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 Tata Power Solar TP540HG10TB and Tata Power Solar TP642LG10B?
Tata Power Solar TP540HG10TB has a 25 years power warranty; Tata Power Solar TP642LG10B 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 Tata Power Solar TP540HG10TB and Tata Power Solar TP642LG10B bifacial panels?
Both Tata Power Solar TP540HG10TB and Tata Power Solar TP642LG10B 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.

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.