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TP621LG10B vs TP580LG10B 13 of 19 identical Swap Change panels

Tata Power Solar TP621LG10B vs Tata Power Solar TP580LG10B

Tata Power Solar TP621LG10B
Tata Power Solar
TP621LG10B
621 Wp 22.30 % PERC Bifacial
Open panel page Datasheet PDF
VS
Tata Power Solar TP580LG10B
Tata Power Solar
TP580LG10B
580 Wp 20.83 % PERC Bifacial
Open panel page Datasheet PDF
The verdict

TP621LG10B leads on the differences that matter

The largest is module efficiency: 1.47 pp more efficient. 13 of 19 comparable parameters are identical.

See all 6 differences
How alike are they
13 of 19 comparable
parameters are identical
identical differs
01

What actually differs

6 of 19 parameters
Parameter TP621LG10B TP580LG10B Difference
Module efficiency 22.30 % 20.83 % 1.47 pp more efficient
Rated power 621 Wp 580 Wp 41 W more power
Power density 223.0 Wp/m² 208.3 Wp/m² 14.7 Wp/m² higher
Weight per kWp 58.0 kg/kWp 62.1 kg/kWp 4.1 kg/kWp lighter
Short-circuit current 13.83 A 13.12 A 0.71 A apart
Current at max power 13.26 A 12.62 A 0.64 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
Same temp coeff. for both panels (-0.370 %/°C), so a warmer roof scales both curves by the same factor: the totals fall together and neither panel gains on the other.
TP621LG10B
19,852 kWh
TP580LG10B
18,541 kWh
Lifetime gap
1,311 kWh
Output when it is hot
Rated power carried across the range a module actually sees
Scenario TP621LG10B TP580LG10B
Standard test conditions 25 °C 100.0% of rated power 621 W 580 W
Cool, bright day 40 °C 94.5% of rated power 587 W 548 W
Typical summer roof 55 °C 88.9% of rated power 552 W 516 W
Hot roof 70 °C 83.3% of rated power 518 W 483 W
03

Full specification

Parameter TP621LG10B TP580LG10B Difference
Power and efficiency
Rated power 621 Wp 580 Wp +41 W for TP621LG10B
Module efficiency 22.30 % 20.83 % +1.47 pp for TP621LG10B
Power density 223.0 Wp/m² 208.3 Wp/m² +14.7 Wp/m² for TP621LG10B
Open-circuit voltage 54.52 V 53.63 V Effectively the same
Voltage at max power 46.80 V 45.97 V Effectively the same
Short-circuit current 13.83 A 13.12 A 0.71 A apart
Current at max power 13.26 A 12.62 A 0.64 A apart
Temperature
Temperature coefficient -0.370 %/°C -0.370 %/°C Same
Mechanical
Dimensions 2456x1134x35 mm 2456x1134x35 mm Same
Module area 2.785 m² 2.785 m² Same
Weight 36.0 kg 36.0 kg Same
Weight per kWp 58.0 kg/kWp 62.1 kg/kWp -4.1 kg/kWp for TP621LG10B
Warranty and degradation
Product warranty 12 yrs 12 yrs Same
Performance warranty 30 yrs 30 yrs Same
Annual degradation 0.60 %/yr 0.60 %/yr Same
Technology
Cell technology PERC PERC Same
Cell type Monocrystalline Monocrystalline Same
Cell count 156 156 Same
Bifacial Yes Yes Same
04

Against the whole database

14,005 panels
Efficiency
#5,100 vs #10,433
TP621LG10B leads by 5,333 places
Power density
#5,093 vs #10,448
TP621LG10B leads by 5,355 places
Heat behaviour
#13,081 vs #13,081
Tied - the same position in the database
Weight
#11,501 vs #12,738
TP621LG10B leads by 1,237 places
Warranty
#21 vs #21
Tied - the same position in the database
Overall
#3,329 vs #6,484
TP621LG10B leads by 3,155 places
05

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06

Written summary

07

Questions about this pairing

Which panel is better: Tata Power Solar TP621LG10B or Tata Power Solar TP580LG10B?
According to our database: Tata Power Solar TP621LG10B has higher module efficiency (22.30% vs 20.83%). See the full spec comparison and 30-year energy simulation above for a complete picture.
What is the efficiency of Tata Power Solar TP621LG10B and Tata Power Solar TP580LG10B?
Tata Power Solar TP621LG10B has a module efficiency of 22.30%, while Tata Power Solar TP580LG10B is 20.83%. Higher efficiency means more electricity from the same roof area - useful when space is limited.
What cell technology does Tata Power Solar TP621LG10B use vs Tata Power Solar TP580LG10B?
Tata Power Solar TP621LG10B uses PERC cells; Tata Power Solar TP580LG10B 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 TP621LG10B and Tata Power Solar TP580LG10B?
Tata Power Solar TP621LG10B has a 30 years power warranty; Tata Power Solar TP580LG10B 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 TP621LG10B and Tata Power Solar TP580LG10B bifacial panels?
Both Tata Power Solar TP621LG10B and Tata Power Solar TP580LG10B 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.