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TP590LG10B vs TP621LG10B 14 of 19 identical Swap Change panels

Tata Power Solar TP590LG10B vs Tata Power Solar TP621LG10B

Tata Power Solar TP590LG10B
Tata Power Solar
TP590LG10B
590 Wp 21.18 % PERC Bifacial
Open panel page Datasheet PDF
VS
Tata Power Solar TP621LG10B
Tata Power Solar
TP621LG10B
621 Wp 22.30 % PERC Bifacial
Open panel page Datasheet PDF
The verdict

TP621LG10B leads on the differences that matter

The largest is module efficiency: 1.12 pp more efficient. 14 of 19 comparable parameters are identical.

See all 5 differences
How alike are they
14 of 19 comparable
parameters are identical
identical differs
01

What actually differs

5 of 19 parameters
Parameter TP590LG10B TP621LG10B Difference
Module efficiency 21.18 % 22.30 % 1.12 pp more efficient
Power density 211.8 Wp/m² 223.0 Wp/m² 11.1 Wp/m² higher
Rated power 590 Wp 621 Wp 31 W more power
Weight per kWp 61.0 kg/kWp 58.0 kg/kWp 3.0 kg/kWp lighter
Short-circuit current 13.29 A 13.83 A 0.54 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.
TP590LG10B
18,861 kWh
TP621LG10B
19,852 kWh
Lifetime gap
991 kWh
Output when it is hot
Rated power carried across the range a module actually sees
Scenario TP590LG10B TP621LG10B
Standard test conditions 25 °C 100.0% of rated power 590 W 621 W
Cool, bright day 40 °C 94.5% of rated power 557 W 587 W
Typical summer roof 55 °C 88.9% of rated power 525 W 552 W
Hot roof 70 °C 83.3% of rated power 492 W 518 W
03

Full specification

Parameter TP590LG10B TP621LG10B Difference
Power and efficiency
Rated power 590 Wp 621 Wp +31 W for TP621LG10B
Module efficiency 21.18 % 22.30 % +1.12 pp for TP621LG10B
Power density 211.8 Wp/m² 223.0 Wp/m² +11.1 Wp/m² for TP621LG10B
Open-circuit voltage 53.90 V 54.52 V Effectively the same
Voltage at max power 46.18 V 46.80 V Effectively the same
Short-circuit current 13.29 A 13.83 A 0.54 A apart
Current at max power 12.78 A 13.26 A Effectively the same
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 61.0 kg/kWp 58.0 kg/kWp -3.0 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
#9,216 vs #5,100
TP621LG10B leads by 4,116 places
Power density
#9,158 vs #5,093
TP621LG10B leads by 4,065 places
Heat behaviour
#13,081 vs #13,081
Tied - the same position in the database
Weight
#12,577 vs #11,501
TP621LG10B leads by 1,076 places
Warranty
#21 vs #21
Tied - the same position in the database
Overall
#5,685 vs #3,329
TP621LG10B leads by 2,356 places
05

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06

Written summary

07

Questions about this pairing

Which panel is better: Tata Power Solar TP590LG10B or Tata Power Solar TP621LG10B?
According to our database: Tata Power Solar TP621LG10B has higher module efficiency (22.30% vs 21.18%). See the full spec comparison and 30-year energy simulation above for a complete picture.
What is the efficiency of Tata Power Solar TP590LG10B and Tata Power Solar TP621LG10B?
Tata Power Solar TP590LG10B has a module efficiency of 21.18%, while Tata Power Solar TP621LG10B is 22.30%. Higher efficiency means more electricity from the same roof area - useful when space is limited.
What cell technology does Tata Power Solar TP590LG10B use vs Tata Power Solar TP621LG10B?
Tata Power Solar TP590LG10B uses PERC cells; Tata Power Solar TP621LG10B 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 TP590LG10B and Tata Power Solar TP621LG10B?
Tata Power Solar TP590LG10B has a 30 years power warranty; Tata Power Solar TP621LG10B 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 TP590LG10B and Tata Power Solar TP621LG10B bifacial panels?
Both Tata Power Solar TP590LG10B and Tata Power Solar TP621LG10B 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.