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RS8V420M-FB vs RS9H-M TOPCON-730 6 of 19 identical Swap Change panels

Resun Solar RS8V420M-FB vs Resun Solar RS9H-M TOPCON-730

Resun Solar
RS8V420M-FB
420 Wp 21.51 % TOPCon
Open panel page Datasheet PDF
VS
Resun Solar RS9H-M TOPCON-730
Resun Solar
RS9H-M TOPCON-730
730 Wp 23.50 % TOPCon
Open panel page Datasheet PDF
The verdict

RS9H-M TOPCON-730 leads on the differences that matter

The largest is module efficiency: 1.99 pp more efficient. 6 of 19 comparable parameters are identical.

See all 13 differences
How alike are they
6 of 19 comparable
parameters are identical
identical differs
01

What actually differs

13 of 19 parameters
Parameter RS8V420M-FB RS9H-M TOPCON-730 Difference
Module efficiency 21.51 % 23.50 % 1.99 pp more efficient
Temperature coefficient -0.350 %/°C -0.300 %/°C 0.050 %/°C better in heat
Rated power 420 Wp 730 Wp 310 W more power
Power density 215.1 Wp/m² 235.0 Wp/m² 19.9 Wp/m² higher
Weight 21.5 kg 32.3 kg 10.8 kg lighter
Weight per kWp 51.2 kg/kWp 44.2 kg/kWp 6.9 kg/kWp lighter
Open-circuit voltage 37.58 V 49.80 V 12.22 V apart
Short-circuit current 14.11 A 18.59 A 4.48 A apart
Module area 1.953 m² 3.106 m² 1.154 m² apart
Voltage at max power 31.78 V 41.70 V 9.92 V apart
Current at max power 13.22 A 17.51 A 4.29 A apart
Cell count 108 132 24 cells apart
Dimensions 1722x1134x30 mm 2384x1303x30 mm 1722x1134x30 mm vs 2384x1303x30 mm
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
RS8V420M-FB
13,873 kWh
RS9H-M TOPCON-730
24,112 kWh
Lifetime gap
10,239 kWh
Output when it is hot
Rated power carried across the range a module actually sees
Scenario RS8V420M-FB RS9H-M TOPCON-730
Standard test conditions 25 °C 100.0% of rated power 420 W 730 W
Cool, bright day 40 °C 94.8% of rated power 398 W 697 W
Typical summer roof 55 °C 89.5% of rated power 376 W 664 W
Hot roof 70 °C 84.2% of rated power 354 W 631 W
03

Full specification

Parameter RS8V420M-FB RS9H-M TOPCON-730 Difference
Power and efficiency
Rated power 420 Wp 730 Wp +310 W for RS9H-M TOPCON-730
Module efficiency 21.51 % 23.50 % +1.99 pp for RS9H-M TOPCON-730
Power density 215.1 Wp/m² 235.0 Wp/m² +19.9 Wp/m² for RS9H-M TOPCON-730
Open-circuit voltage 37.58 V 49.80 V 12.22 V apart
Voltage at max power 31.78 V 41.70 V 9.92 V apart
Short-circuit current 14.11 A 18.59 A 4.48 A apart
Current at max power 13.22 A 17.51 A 4.29 A apart
Temperature
Temperature coefficient -0.350 %/°C -0.300 %/°C +0.050 %/°C for RS9H-M TOPCON-730
Mechanical
Dimensions 1722x1134x30 mm 2384x1303x30 mm 1722x1134x30 mm vs 2384x1303x30 mm
Module area 1.953 m² 3.106 m² 1.154 m² apart
Weight 21.5 kg 32.3 kg -10.8 kg for RS8V420M-FB
Weight per kWp 51.2 kg/kWp 44.2 kg/kWp -6.9 kg/kWp for RS9H-M TOPCON-730
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 108 132 24 cells apart
Bifacial No No Same
04

Against the whole database

14,005 panels
Efficiency
#7,894 vs #716
RS9H-M TOPCON-730 leads by 7,178 places
Power density
#7,882 vs #800
RS9H-M TOPCON-730 leads by 7,082 places
Heat behaviour
#10,419 vs #6,093
RS9H-M TOPCON-730 leads by 4,326 places
Weight
#4,567 vs #407
RS9H-M TOPCON-730 leads by 4,160 places
Warranty
#21 vs #21
Tied - the same position in the database
Overall
#10,194 vs #179
RS9H-M TOPCON-730 leads by 10,015 places
05

More useful comparisons

Open the full database
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Resun Solar RS8V420M-FB vs Resun Solar RS8V430M-FB
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Resun Solar RS8V420M-FB vs Resun Solar RS8V425M-FB
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Resun Solar RS9H-M TOPCON-730 vs Resun Solar RS9H-M TOPCON-735
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Resun Solar RS9H-M TOPCON-730 vs Resun Solar RS9H-M TOPCON-725
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Resun Solar RS9H-M TOPCON-730 vs Resun Solar RS9H-M TOPCON-720
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06

Written summary

07

Questions about this pairing

Which panel is better: Resun Solar RS8V420M-FB or Resun Solar RS9H-M TOPCON-730?
According to our database: Resun Solar RS9H-M TOPCON-730 has higher module efficiency (23.50% vs 21.51%); Resun Solar RS9H-M TOPCON-730 tolerates heat better (temp coeff -0.300%/°C vs -0.350%/°C). See the full spec comparison and 30-year energy simulation above for a complete picture.
What is the efficiency of Resun Solar RS8V420M-FB and Resun Solar RS9H-M TOPCON-730?
Resun Solar RS8V420M-FB has a module efficiency of 21.51%, while Resun Solar RS9H-M TOPCON-730 is 23.50%. Higher efficiency means more electricity from the same roof area - useful when space is limited.
What cell technology does Resun Solar RS8V420M-FB use vs Resun Solar RS9H-M TOPCON-730?
Resun Solar RS8V420M-FB uses TOPCon cells; Resun Solar RS9H-M TOPCON-730 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 RS8V420M-FB and Resun Solar RS9H-M TOPCON-730?
Resun Solar RS8V420M-FB has a 30 years power warranty; Resun Solar RS9H-M TOPCON-730 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.

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.