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585WT vs 580WT 18 of 19 identical Swap Change panels

Tata Power Solar GSD7S72T-585WT vs Tata Power Solar GSD7S72T-580WT

Tata Power Solar
GSD7S72T-585WT
585 Wp 22.65 % TOPCon Bifacial
Open panel page Datasheet PDF
VS
Tata Power Solar
GSD7S72T-580WT
580 Wp 22.45 % TOPCon Bifacial
Open panel page Datasheet PDF
The verdict

585WT leads on the differences that matter

The largest is module efficiency: 0.20 pp more efficient. 18 of 19 comparable parameters are identical.

See the one difference
How alike are they
18 of 19 comparable
parameters are identical
identical differs
01

What actually differs

1 of 19 parameters
Parameter 585WT 580WT Difference
Module efficiency 22.65 % 22.45 % 0.20 pp more efficient
02

What it means on a roof

Thirty years of production
Declared annual degradation, with a 1.0% first-year loss assumed for both panels because at least one datasheet omits it, at 1,200 kWh/kWp a year
Same temp coeff. for both panels (-0.300 %/°C), so a warmer roof scales both curves by the same factor: the totals fall together and neither panel gains on the other.
585WT
19,628 kWh
580WT
19,460 kWh
Lifetime gap
168 kWh
Output when it is hot
Rated power carried across the range a module actually sees
Scenario 585WT 580WT
Standard test conditions 25 °C 100.0% of rated power 585 W 580 W
Cool, bright day 40 °C 95.5% of rated power 559 W 554 W
Typical summer roof 55 °C 91.0% of rated power 532 W 528 W
Hot roof 70 °C 86.5% of rated power 506 W 502 W
03

Full specification

Parameter 585WT 580WT Difference
Power and efficiency
Rated power 585 Wp 580 Wp Effectively the same
Module efficiency 22.65 % 22.45 % +0.20 pp for 585WT
Power density 226.5 Wp/m² 224.5 Wp/m² Effectively the same
Open-circuit voltage 51.16 V 51.02 V Effectively the same
Voltage at max power 42.52 V 42.37 V Effectively the same
Short-circuit current 14.55 A 14.47 A Effectively the same
Current at max power 13.76 A 13.69 A Effectively the same
Temperature
Temperature coefficient -0.300 %/°C -0.300 %/°C Same
Mechanical
Dimensions 2278x1134x30 mm 2278x1134x30 mm Same
Module area 2.583 m² 2.583 m² Same
Weight 32.0 kg 32.0 kg Same
Weight per kWp 54.7 kg/kWp 55.2 kg/kWp Effectively the same
Warranty and degradation
Product warranty 25 yrs 25 yrs Same
Performance warranty 30 yrs 30 yrs Same
Annual degradation 0.40 %/yr 0.40 %/yr Same
Technology
Cell technology TOPCon TOPCon Same
Cell type Monocrystalline Monocrystalline Same
Cell count 144 144 Same
Bifacial Yes Yes Same
04

Against the whole database

14,005 panels
Efficiency
#3,522 vs #4,620
585WT leads by 1,098 places
Power density
#3,500 vs #4,547
585WT leads by 1,047 places
Heat behaviour
#6,093 vs #6,093
Tied - the same position in the database
Weight
#9,081 vs #9,588
585WT leads by 507 places
Warranty
#21 vs #21
Tied - the same position in the database
Overall
#1,777 vs #2,039
585WT leads by 262 places
05

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06

Written summary

07

Questions about this pairing

Which panel is better: Tata Power Solar GSD7S72T-585WT or Tata Power Solar GSD7S72T-580WT?
According to our database: Tata Power Solar GSD7S72T-585WT has higher module efficiency (22.65% vs 22.45%). See the full spec comparison and 30-year energy simulation above for a complete picture.
What is the efficiency of Tata Power Solar GSD7S72T-585WT and Tata Power Solar GSD7S72T-580WT?
Tata Power Solar GSD7S72T-585WT has a module efficiency of 22.65%, while Tata Power Solar GSD7S72T-580WT is 22.45%. Higher efficiency means more electricity from the same roof area - useful when space is limited.
What cell technology does Tata Power Solar GSD7S72T-585WT use vs Tata Power Solar GSD7S72T-580WT?
Tata Power Solar GSD7S72T-585WT uses TOPCon cells; Tata Power Solar GSD7S72T-580WT uses TOPCon. 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 GSD7S72T-585WT and Tata Power Solar GSD7S72T-580WT?
Tata Power Solar GSD7S72T-585WT has a 30 years power warranty; Tata Power Solar GSD7S72T-580WT 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 GSD7S72T-585WT and Tata Power Solar GSD7S72T-580WT bifacial panels?
Both Tata Power Solar GSD7S72T-585WT and Tata Power Solar GSD7S72T-580WT 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.