Tata Power Solar TP570LG10TB vs Tata Power Solar TP621LG10B
VS
The verdict
TP621LG10B leads on the differences that matter
The largest is module efficiency: 1.83 pp more efficient. 6 of 19 comparable parameters are identical.
See all 13 differencesHow alike are they
6
of 19 comparable
parameters are identical
parameters are identical
identical
differs
01
13 of 19 parameters
What actually differs
Parameter
TP570LG10TB
TP621LG10B
Difference
Module efficiency
20.47 %
22.30 %
1.83 pp more efficient
Rated power
570 Wp
621 Wp
51 W more power
Power density
204.7 Wp/m²
223.0 Wp/m²
18.3 Wp/m² higher
Performance warranty
25 yrs
30 yrs
5 yrs longer
Weight
31.0 kg
36.0 kg
5.0 kg lighter
Annual degradation
0.72 %/yr
0.60 %/yr
0.12 %/yr slower
Product warranty
10 yrs
12 yrs
2 yrs longer
Weight per kWp
54.4 kg/kWp
58.0 kg/kWp
3.6 kg/kWp lighter
Temperature coefficient
-0.360 %/°C
-0.370 %/°C
0.010 %/°C better in heat
Short-circuit current
13.04 A
13.83 A
0.79 A apart
Open-circuit voltage
53.41 V
54.52 V
1.11 V apart
Current at max power
12.47 A
13.26 A
0.79 A apart
Voltage at max power
45.71 V
46.80 V
1.09 V 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
TP570LG10TB
17,865 kWh
TP621LG10B
19,852 kWh
Lifetime gap
1,987 kWh
Output when it is hot
Rated power carried across the range a module actually sees
Scenario
TP570LG10TB
TP621LG10B
Standard test conditions
25 °C
100.0% of rated power
570 W
621 W
Cool, bright day
40 °C
94.5% of rated power
539 W
587 W
Typical summer roof
55 °C
88.9% of rated power
508 W
552 W
Hot roof
70 °C
83.3% of rated power
478 W
518 W
03
Full specification
Parameter
TP570LG10TB
TP621LG10B
Difference
Power and efficiency
Rated power
570 Wp
621 Wp
+51 W for TP621LG10B
Module efficiency
20.47 %
22.30 %
+1.83 pp for TP621LG10B
Power density
204.7 Wp/m²
223.0 Wp/m²
+18.3 Wp/m² for TP621LG10B
Open-circuit voltage
53.41 V
54.52 V
1.11 V apart
Voltage at max power
45.71 V
46.80 V
1.09 V apart
Short-circuit current
13.04 A
13.83 A
0.79 A apart
Current at max power
12.47 A
13.26 A
0.79 A apart
Temperature
Temperature coefficient
-0.360 %/°C
-0.370 %/°C
+0.010 %/°C for TP570LG10TB
Mechanical
Dimensions
2456x1134x35 mm
2456x1134x35 mm
Same
Module area
2.785 m²
2.785 m²
Same
Weight
31.0 kg
36.0 kg
-5.0 kg for TP570LG10TB
Weight per kWp
54.4 kg/kWp
58.0 kg/kWp
-3.6 kg/kWp for TP570LG10TB
Warranty and degradation
Product warranty
10 yrs
12 yrs
+2 yrs for TP621LG10B
Performance warranty
25 yrs
30 yrs
+5 yrs for TP621LG10B
Annual degradation
0.72 %/yr
0.60 %/yr
-0.12 %/yr for TP621LG10B
Technology
Cell technology
PERC
PERC
Same
Cell type
Monocrystalline
Monocrystalline
Same
Cell count
156
156
Same
Bifacial
Yes
Yes
Same
04
14,005 panels
Against the whole database
Efficiency
#11,523
vs
#5,100
TP621LG10B leads by 6,423 places
Power density
#11,502
vs
#5,093
TP621LG10B leads by 6,409 places
Heat behaviour
#12,345
vs
#13,081
TP570LG10TB leads by 736 places
Weight
#8,692
vs
#11,501
TP570LG10TB leads by 2,809 places
Warranty
#9,798
vs
#21
TP621LG10B leads by 9,777 places
Overall
#8,820
vs
#3,329
TP621LG10B leads by 5,491 places
05
Open the full database
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06
Written summary
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07
Questions about this pairing
Which panel is better: Tata Power Solar TP570LG10TB or Tata Power Solar TP621LG10B?
According to our database: Tata Power Solar TP621LG10B has higher module efficiency (22.30% vs 20.47%); Tata Power Solar TP570LG10TB 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 TP570LG10TB and Tata Power Solar TP621LG10B?
Tata Power Solar TP570LG10TB has a module efficiency of 20.47%, 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 TP570LG10TB use vs Tata Power Solar TP621LG10B?
Tata Power Solar TP570LG10TB 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 TP570LG10TB and Tata Power Solar TP621LG10B?
Tata Power Solar TP570LG10TB has a 25 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 TP570LG10TB and Tata Power Solar TP621LG10B bifacial panels?
Both Tata Power Solar TP570LG10TB 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.