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440 vs 420 15 of 19 identical Swap Change panels

Resun Solar RS8V-M-DG-440 vs Resun Solar RS8V-M-DG-420

Resun Solar RS8V-M-DG-440
Resun Solar
RS8V-M-DG-440
440 Wp 22.53 % TOPCon Bifacial
Open panel page Datasheet PDF
VS
Resun Solar RS8V-M-DG-420
Resun Solar
RS8V-M-DG-420
420 Wp 21.51 % TOPCon Bifacial
Open panel page Datasheet PDF
The verdict

440 leads on the differences that matter

The largest is module efficiency: 1.02 pp more efficient. 15 of 19 comparable parameters are identical.

See all 4 differences
How alike are they
15 of 19 comparable
parameters are identical
identical differs
01

What actually differs

4 of 19 parameters
Parameter 440 420 Difference
Module efficiency 22.53 % 21.51 % 1.02 pp more efficient
Power density 225.3 Wp/m² 215.1 Wp/m² 10.2 Wp/m² higher
Rated power 440 Wp 420 Wp 20 W more power
Weight per kWp 54.1 kg/kWp 56.7 kg/kWp 2.6 kg/kWp lighter
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.
440
14,533 kWh
420
13,873 kWh
Lifetime gap
660 kWh
Output when it is hot
Rated power carried across the range a module actually sees
Scenario 440 420
Standard test conditions 25 °C 100.0% of rated power 440 W 420 W
Cool, bright day 40 °C 95.5% of rated power 420 W 401 W
Typical summer roof 55 °C 91.0% of rated power 400 W 382 W
Hot roof 70 °C 86.5% of rated power 381 W 363 W
03

Full specification

Parameter 440 420 Difference
Power and efficiency
Rated power 440 Wp 420 Wp +20 W for 440
Module efficiency 22.53 % 21.51 % +1.02 pp for 440
Power density 225.3 Wp/m² 215.1 Wp/m² +10.2 Wp/m² for 440
Open-circuit voltage 38.90 V 38.30 V Effectively the same
Voltage at max power 32.45 V 31.85 V Effectively the same
Short-circuit current 14.36 A 14.00 A Effectively the same
Current at max power 13.56 A 13.19 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 23.8 kg 23.8 kg Same
Weight per kWp 54.1 kg/kWp 56.7 kg/kWp -2.6 kg/kWp for 440
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 Yes Yes Same
04

Against the whole database

14,005 panels
Efficiency
#3,982 vs #7,894
440 leads by 3,912 places
Power density
#4,099 vs #7,882
440 leads by 3,783 places
Heat behaviour
#6,093 vs #6,093
Tied - the same position in the database
Weight
#8,316 vs #10,801
440 leads by 2,485 places
Warranty
#21 vs #21
Tied - the same position in the database
Overall
#8,801 vs #10,246
440 leads by 1,445 places
05

More useful comparisons

Open the full database
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Resun Solar RS8V-M-DG-440 vs Resun Solar RS8V-M-DG
The same specification on paper
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Resun Solar RS8V-M-DG-440 vs Resun Solar RS8V-M-DG-435
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Resun Solar RS8V-M-DG-440 vs Resun Solar RS8V-M-DG-430
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Resun Solar RS8V-M-DG-440 vs Resun Solar RS8V-M-DG-425
3 differences, the largest is module efficiency
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Resun Solar RS8V-M-DG-440 vs Resun Solar RS8V-M-DG-415
4 differences, the largest is module efficiency
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Resun Solar RS8V-M-DG-440 vs Resun Solar RS9H-M TOPCON-735
13 differences, the largest is module efficiency
06

Written summary

07

Questions about this pairing

Which panel is better: Resun Solar RS8V-M-DG-440 or Resun Solar RS8V-M-DG-420?
According to our database: Resun Solar RS8V-M-DG-440 has higher module efficiency (22.53% vs 21.51%). See the full spec comparison and 30-year energy simulation above for a complete picture.
What is the efficiency of Resun Solar RS8V-M-DG-440 and Resun Solar RS8V-M-DG-420?
Resun Solar RS8V-M-DG-440 has a module efficiency of 22.53%, while Resun Solar RS8V-M-DG-420 is 21.51%. Higher efficiency means more electricity from the same roof area - useful when space is limited.
What cell technology does Resun Solar RS8V-M-DG-440 use vs Resun Solar RS8V-M-DG-420?
Resun Solar RS8V-M-DG-440 uses TOPCon cells; Resun Solar RS8V-M-DG-420 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 Resun Solar RS8V-M-DG-440 and Resun Solar RS8V-M-DG-420?
Resun Solar RS8V-M-DG-440 has a 30 years power warranty; Resun Solar RS8V-M-DG-420 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 Resun Solar RS8V-M-DG-440 and Resun Solar RS8V-M-DG-420 bifacial panels?
Both Resun Solar RS8V-M-DG-440 and Resun Solar RS8V-M-DG-420 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.