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JT790SXt(B) vs JT780SXt(B) 17 of 19 identical Swap Change panels

Jetion JT790SXt(B) vs Jetion JT780SXt(B)

Jetion
JT790SXt(B)
790 Wp 23.40 % TOPCon Bifacial
Open panel page Datasheet PDF
VS
Jetion
JT780SXt(B)
780 Wp 23.10 % TOPCon Bifacial
Open panel page Datasheet PDF
The verdict

JT790SXt(B) leads on the differences that matter

The largest is module efficiency: 0.30 pp more efficient. 17 of 19 comparable parameters are identical.

See all 2 differences
How alike are they
17 of 19 comparable
parameters are identical
identical differs
01

What actually differs

2 of 19 parameters
Parameter JT790SXt(B) JT780SXt(B) Difference
Module efficiency 23.40 % 23.10 % 0.30 pp more efficient
Rated power 790 Wp 780 Wp 10 W more power
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 (-0.290 %/°C), so a warmer roof scales both curves by the same factor: the totals fall together and neither panel gains on the other.
JT790SXt(B)
26,506 kWh
JT780SXt(B)
26,171 kWh
Lifetime gap
335 kWh
Output when it is hot
Rated power carried across the range a module actually sees
Scenario JT790SXt(B) JT780SXt(B)
Standard test conditions 25 °C 100.0% of rated power 790 W 780 W
Cool, bright day 40 °C 95.7% of rated power 756 W 746 W
Typical summer roof 55 °C 91.3% of rated power 721 W 712 W
Hot roof 70 °C 87.0% of rated power 687 W 678 W
03

Full specification

Parameter JT790SXt(B) JT780SXt(B) Difference
Power and efficiency
Rated power 790 Wp 780 Wp +10 W for JT790SXt(B)
Module efficiency 23.40 % 23.10 % +0.30 pp for JT790SXt(B)
Power density 233.6 Wp/m² 230.7 Wp/m² Effectively the same
Open-circuit voltage 53.98 V 53.60 V Effectively the same
Voltage at max power 45.39 V 45.10 V Effectively the same
Short-circuit current 18.61 A 18.50 A Effectively the same
Current at max power 17.41 A 17.30 A Effectively the same
Temperature
Temperature coefficient -0.290 %/°C -0.290 %/°C Same
Mechanical
Dimensions 2595x1303x33 mm 2595x1303x33 mm Same
Module area 3.381 m² 3.381 m² Same
Weight 40.0 kg 40.0 kg Same
Weight per kWp 50.6 kg/kWp 51.3 kg/kWp Effectively the same
Warranty and degradation
Product warranty 12 yrs 12 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
#882 vs #1,570
JT790SXt(B) leads by 688 places
Power density
#928 vs #1,683
JT790SXt(B) leads by 755 places
Heat behaviour
#2,165 vs #2,165
Tied - the same position in the database
Weight
#4,073 vs #4,670
JT790SXt(B) leads by 597 places
Warranty
#21 vs #21
Tied - the same position in the database
Overall
#76 vs #129
JT790SXt(B) leads by 53 places
05

More useful comparisons

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Jetion JT790SXt(B) vs Jetion JT750SLk(B)
14 differences, the largest is temperature coefficient
06

Written summary

07

Questions about this pairing

Which panel is better: Jetion JT790SXt(B) or Jetion JT780SXt(B)?
According to our database: Jetion JT790SXt(B) has higher module efficiency (23.40% vs 23.10%). See the full spec comparison and 30-year energy simulation above for a complete picture.
What is the efficiency of Jetion JT790SXt(B) and Jetion JT780SXt(B)?
Jetion JT790SXt(B) has a module efficiency of 23.40%, while Jetion JT780SXt(B) is 23.10%. Higher efficiency means more electricity from the same roof area - useful when space is limited.
What cell technology does Jetion JT790SXt(B) use vs Jetion JT780SXt(B)?
Jetion JT790SXt(B) uses TOPCon cells; Jetion JT780SXt(B) 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 Jetion JT790SXt(B) and Jetion JT780SXt(B)?
Jetion JT790SXt(B) has a 30 years power warranty; Jetion JT780SXt(B) 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 Jetion JT790SXt(B) and Jetion JT780SXt(B) bifacial panels?
Both Jetion JT790SXt(B) and Jetion JT780SXt(B) 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.

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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.