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425 vs 420 18 of 19 identical Swap Change panels

Resun Solar RS8V-M-DG-425 vs Resun Solar RS8V-M-DG-420

Resun Solar RS8V-M-DG-425
Resun Solar
RS8V-M-DG-425
425 Wp 21.76 % 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

425 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 425 420 Difference
Module efficiency 21.76 % 21.51 % 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.
425
14,038 kWh
420
13,873 kWh
Lifetime gap
165 kWh
Output when it is hot
Rated power carried across the range a module actually sees
Scenario 425 420
Standard test conditions 25 °C 100.0% of rated power 425 W 420 W
Cool, bright day 40 °C 95.5% of rated power 406 W 401 W
Typical summer roof 55 °C 91.0% of rated power 387 W 382 W
Hot roof 70 °C 86.5% of rated power 368 W 363 W
03

Full specification

Parameter 425 420 Difference
Power and efficiency
Rated power 425 Wp 420 Wp Effectively the same
Module efficiency 21.76 % 21.51 % +0.25 pp for 425
Power density 217.6 Wp/m² 215.1 Wp/m² Effectively the same
Open-circuit voltage 38.45 V 38.30 V Effectively the same
Voltage at max power 31.99 V 31.85 V Effectively the same
Short-circuit current 14.09 A 14.00 A Effectively the same
Current at max power 13.29 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 56.0 kg/kWp 56.7 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 Yes Yes Same
04

Against the whole database

14,005 panels
Efficiency
#7,285 vs #7,894
425 leads by 609 places
Power density
#7,172 vs #7,882
425 leads by 710 places
Heat behaviour
#6,093 vs #6,093
Tied - the same position in the database
Weight
#10,317 vs #10,801
425 leads by 484 places
Warranty
#21 vs #21
Tied - the same position in the database
Overall
#9,980 vs #10,246
425 leads by 266 places
05

More useful comparisons

Open the full database
Same series, other bin
Resun Solar
Resun Solar RS8V-M-DG-425 vs Resun Solar RS8V-M-DG
3 differences, the largest is module efficiency
Same series, other bin
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Resun Solar RS8V-M-DG-425 vs Resun Solar RS8V-M-DG-440
3 differences, the largest is module efficiency
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Resun Solar RS8V-M-DG-425 vs Resun Solar RS8V-M-DG-435
3 differences, the largest is module efficiency
Same series, other bin
Resun Solar
Resun Solar RS8V-M-DG-425 vs Resun Solar RS8V-M-DG-430
One difference: module efficiency
Same series, other bin
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Resun Solar RS8V-M-DG-425 vs Resun Solar RS8V-M-DG-415
3 differences, the largest is module efficiency
Same manufacturer
Resun Solar
Resun Solar RS8V-M-DG-425 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-425 or Resun Solar RS8V-M-DG-420?
According to our database: Resun Solar RS8V-M-DG-425 has higher module efficiency (21.76% 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-425 and Resun Solar RS8V-M-DG-420?
Resun Solar RS8V-M-DG-425 has a module efficiency of 21.76%, 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-425 use vs Resun Solar RS8V-M-DG-420?
Resun Solar RS8V-M-DG-425 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-425 and Resun Solar RS8V-M-DG-420?
Resun Solar RS8V-M-DG-425 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-425 and Resun Solar RS8V-M-DG-420 bifacial panels?
Both Resun Solar RS8V-M-DG-425 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.