Skip to main content
RS8V-M-DG vs RS8V-M-DG-420 15 of 19 identical Swap Change panels

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

Resun Solar RS8V-M-DG
Resun Solar
RS8V-M-DG
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

RS8V-M-DG 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 RS8V-M-DG RS8V-M-DG-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.
RS8V-M-DG
14,533 kWh
RS8V-M-DG-420
13,873 kWh
Lifetime gap
660 kWh
Output when it is hot
Rated power carried across the range a module actually sees
Scenario RS8V-M-DG RS8V-M-DG-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 RS8V-M-DG RS8V-M-DG-420 Difference
Power and efficiency
Rated power 440 Wp 420 Wp +20 W for RS8V-M-DG
Module efficiency 22.53 % 21.51 % +1.02 pp for RS8V-M-DG
Power density 225.3 Wp/m² 215.1 Wp/m² +10.2 Wp/m² for RS8V-M-DG
Open-circuit voltage 38.10 V 38.30 V Effectively the same
Voltage at max power 32.41 V 31.85 V Effectively the same
Short-circuit current 14.43 A 14.00 A Effectively the same
Current at max power 13.58 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 RS8V-M-DG
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
RS8V-M-DG leads by 3,912 places
Power density
#4,099 vs #7,882
RS8V-M-DG 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
RS8V-M-DG leads by 2,485 places
Warranty
#21 vs #21
Tied - the same position in the database
Overall
#8,801 vs #10,246
RS8V-M-DG leads by 1,445 places
05

More useful comparisons

Open the full database
Same series, other bin
Resun Solar
Resun Solar RS8V-M-DG vs Resun Solar RS8V-M-DG-440
The same specification on paper
Same series, other bin
Resun Solar
Resun Solar RS8V-M-DG vs Resun Solar RS8V-M-DG-435
One difference: module efficiency
Same series, other bin
Resun Solar
Resun Solar RS8V-M-DG vs Resun Solar RS8V-M-DG-430
3 differences, the largest is module efficiency
Same series, other bin
Resun Solar
Resun Solar RS8V-M-DG vs Resun Solar RS8V-M-DG-425
3 differences, the largest is module efficiency
Same series, other bin
Resun Solar
Resun Solar RS8V-M-DG vs Resun Solar RS8V-M-DG-415
5 differences, the largest is module efficiency
Same manufacturer
Resun Solar
Resun Solar RS8V-M-DG 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 or Resun Solar RS8V-M-DG-420?
According to our database: Resun Solar RS8V-M-DG 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 and Resun Solar RS8V-M-DG-420?
Resun Solar RS8V-M-DG 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 use vs Resun Solar RS8V-M-DG-420?
Resun Solar RS8V-M-DG 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 and Resun Solar RS8V-M-DG-420?
Resun Solar RS8V-M-DG 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 and Resun Solar RS8V-M-DG-420 bifacial panels?
Both Resun Solar RS8V-M-DG 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.