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(455W class) vs (450W class) 18 of 19 identical Swap Change panels

Just Solar JST-EDMH-(445-465)W-TD (455W class) vs Just Solar JST-EDMH-(445-465)W-TD (450W class)

Just Solar
JST-EDMH-(445-465)W-TD (455W class)
455 Wp 23.30 % TOPCon
Open panel page Datasheet PDF
VS
Just Solar
JST-EDMH-(445-465)W-TD (450W class)
450 Wp 23.05 % TOPCon
Open panel page Datasheet PDF
The verdict

(455W class) leads on the differences that matter

The largest is module efficiency: 0.25 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 (455W class) (450W class) Difference
Module efficiency 23.30 % 23.05 % 0.25 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.
(455W class)
15,029 kWh
(450W class)
14,864 kWh
Lifetime gap
165 kWh
Output when it is hot
Rated power carried across the range a module actually sees
Scenario (455W class) (450W class)
Standard test conditions 25 °C 100.0% of rated power 455 W 450 W
Cool, bright day 40 °C 95.5% of rated power 435 W 430 W
Typical summer roof 55 °C 91.0% of rated power 414 W 410 W
Hot roof 70 °C 86.5% of rated power 394 W 389 W
03

Full specification

Parameter (455W class) (450W class) Difference
Power and efficiency
Rated power 455 Wp 450 Wp Effectively the same
Module efficiency 23.30 % 23.05 % +0.25 pp for (455W class)
Power density 233.0 Wp/m² 230.4 Wp/m² Effectively the same
Open-circuit voltage 38.70 V 38.50 V Effectively the same
Voltage at max power 33.10 V 32.90 V Effectively the same
Short-circuit current 14.26 A 14.19 A Effectively the same
Current at max power 13.75 A 13.68 A Effectively the same
Temperature
Temperature coefficient -0.300 %/°C -0.300 %/°C Same
Mechanical
Dimensions 1722x1134x30 mm 1722x1134x30 mm Same
Module area 1.953 m² 1.953 m² Same
Weight 20.5 kg 20.5 kg Same
Weight per kWp 45.1 kg/kWp 45.6 kg/kWp Effectively the same
Warranty and degradation
Product warranty 15 yrs 15 yrs Same
Performance warranty 30 yrs 30 yrs Same
Annual degradation 0.50 %/yr 0.50 %/yr Same
Technology
Cell technology TOPCon TOPCon Same
Cell type Monocrystalline Monocrystalline Same
Cell count 108 108 Same
Bifacial No No Same
04

Against the whole database

14,005 panels
Efficiency
#1,017 vs #1,700
(455W class) leads by 683 places
Power density
#1,098 vs #1,708
(455W class) leads by 610 places
Heat behaviour
#6,093 vs #6,093
Tied - the same position in the database
Weight
#607 vs #767
(455W class) leads by 160 places
Warranty
#21 vs #21
Tied - the same position in the database
Overall
#7,080 vs #7,596
(455W class) leads by 516 places
05

More useful comparisons

Open the full database
Same series, other bin
Just Solar
Just Solar JST-EDMH-(445-465)W-TD (455W class) vs Just Solar JST-EDMH-(445-465)W-TD (465W class)
3 differences, the largest is module efficiency
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Just Solar JST-EDMH-(445-465)W-TD (455W class) vs Just Solar JST-EDMH-465W-TD
3 differences, the largest is module efficiency
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Just Solar JST-EDMH-(445-465)W-TD (455W class) vs Just Solar JST-EDMH-(445-465)W-TD (460W class)
One difference: module efficiency
Same series, other bin
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Just Solar JST-EDMH-(445-465)W-TD (455W class) vs Just Solar JST-EDMH-460W-TD
One difference: module efficiency
Same series, other bin
Just Solar
Just Solar JST-EDMH-(445-465)W-TD (455W class) vs Just Solar JST-EDMH-455W-TD
The same specification on paper
Same series, other bin
Just Solar
Just Solar JST-EDMH-(445-465)W-TD (455W class) vs Just Solar JST-EDMH-450W-TD
One difference: module efficiency
06

Written summary

07

Questions about this pairing

Which panel is better: Just Solar JST-EDMH-(445-465)W-TD (455W class) or Just Solar JST-EDMH-(445-465)W-TD (450W class)?
According to our database: Just Solar JST-EDMH-(445-465)W-TD (455 W class) has higher module efficiency (23.30% vs 23.05%). See the full spec comparison and 30-year energy simulation above for a complete picture.
What is the efficiency of Just Solar JST-EDMH-(445-465)W-TD (455W class) and Just Solar JST-EDMH-(445-465)W-TD (450W class)?
Just Solar JST-EDMH-(445-465)W-TD (455 W class) has a module efficiency of 23.30%, while Just Solar JST-EDMH-(445-465)W-TD (450 W class) is 23.05%. Higher efficiency means more electricity from the same roof area - useful when space is limited.
What cell technology does Just Solar JST-EDMH-(445-465)W-TD (455W class) use vs Just Solar JST-EDMH-(445-465)W-TD (450W class)?
Just Solar JST-EDMH-(445-465)W-TD (455 W class) uses TOPCon cells; Just Solar JST-EDMH-(445-465)W-TD (450 W class) 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 Just Solar JST-EDMH-(445-465)W-TD (455W class) and Just Solar JST-EDMH-(445-465)W-TD (450W class)?
Just Solar JST-EDMH-(445-465)W-TD (455 W class) has a 30 years power warranty; Just Solar JST-EDMH-(445-465)W-TD (450 W class) 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.

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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.