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705-8NM vs 730-8DBNM 9 of 18 identical Swap Change panels

Recom RCM-705-8NM vs Recom RCM-730-8DBNM

Recom RCM-705-8NM
Recom
RCM-705-8NM
705 Wp 22.70 % TOPCon
Open panel page Datasheet PDF
VS
Recom RCM-730-8DBNM
Recom
RCM-730-8DBNM
730 Wp 23.50 % TOPCon Bifacial
Open panel page Datasheet PDF
The verdict

730-8DBNM leads on the differences that matter

The largest is module efficiency: 0.80 pp more efficient. 9 of 18 comparable parameters are identical, with 1 more left out because at least one datasheet does not publish it.

See all 9 differences
How alike are they
9 of 18 comparable
parameters are identical
identical differs not published
01

What actually differs

9 of 18 parameters
Parameter 705-8NM 730-8DBNM Difference
Module efficiency 22.70 % 23.50 % 0.80 pp more efficient
Weight 33.9 kg 37.8 kg 3.9 kg lighter
Power density 227.0 Wp/m² 235.0 Wp/m² 8.0 Wp/m² higher
Rated power 705 Wp 730 Wp 25 W more power
Weight per kWp 48.1 kg/kWp 51.8 kg/kWp 3.7 kg/kWp lighter
Temperature coefficient -0.300 %/°C -0.290 %/°C 0.010 %/°C better in heat
Bifacial No Yes No vs Yes
Open-circuit voltage 48.50 V 49.59 V 1.09 V apart
Dimensions 2384x1303x30 mm 2384x1303x33 mm 2384x1303x30 mm vs 2384x1303x33 mm
02

What it means on a roof

Thirty years of production
Each panel's own declared degradation curve, at 1,200 kWh/kWp a year
705-8NM
23,654 kWh
730-8DBNM
24,493 kWh
Lifetime gap
839 kWh
Output when it is hot
Rated power carried across the range a module actually sees
Scenario 705-8NM 730-8DBNM
Standard test conditions 25 °C 100.0% of rated power 705 W 730 W
Cool, bright day 40 °C 95.5% of rated power 673 W 698 W
Typical summer roof 55 °C 91.0% of rated power 642 W 666 W
Hot roof 70 °C 86.5% of rated power 610 W 635 W
03

Full specification

Parameter 705-8NM 730-8DBNM Difference
Power and efficiency
Rated power 705 Wp 730 Wp +25 W for 730-8DBNM
Module efficiency 22.70 % 23.50 % +0.80 pp for 730-8DBNM
Power density 227.0 Wp/m² 235.0 Wp/m² +8.0 Wp/m² for 730-8DBNM
Open-circuit voltage 48.50 V 49.59 V 1.09 V apart
Voltage at max power 40.70 V 41.44 V Effectively the same
Short-circuit current 18.31 A 18.64 A Effectively the same
Current at max power 17.33 A 17.62 A Effectively the same
Temperature
Temperature coefficient -0.300 %/°C -0.290 %/°C +0.010 %/°C for 730-8DBNM
Mechanical
Dimensions 2384x1303x30 mm 2384x1303x33 mm 2384x1303x30 mm vs 2384x1303x33 mm
Module area 3.106 m² 3.106 m² Same
Weight 33.9 kg 37.8 kg -3.9 kg for 705-8NM
Weight per kWp 48.1 kg/kWp 51.8 kg/kWp -3.7 kg/kWp for 705-8NM
Warranty and degradation
Product warranty 30 yrs 30 yrs Same
Performance warranty 30 yrs 30 yrs Same
Annual degradation 0.40 %/yr 0.40 %/yr Same
Technology
Cell technology TOPCon TOPCon Same
Cell type Monocrystalline Monocrystalline Same
Cell count - 132 Not published by Recom
Bifacial No Yes No vs Yes
04

Against the whole database

14,005 panels
Efficiency
#3,307 vs #716
730-8DBNM leads by 2,591 places
Power density
#3,361 vs #800
730-8DBNM leads by 2,561 places
Heat behaviour
#6,093 vs #2,165
730-8DBNM leads by 3,928 places
Weight
#2,052 vs #5,151
705-8NM leads by 3,099 places
Warranty
#21 vs #21
Tied - the same position in the database
Overall
#77 vs #8
730-8DBNM leads by 69 places
05

More useful comparisons

Open the full database
Same series, other bin
Recom
Recom RCM-705-8NM vs Recom RCM-725-8DBNM
8 differences, the largest is module efficiency
Same series, other bin
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Recom RCM-705-8NM vs Recom RCM-720-8DBNM
8 differences, the largest is module efficiency
Same series, other bin
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Recom RCM-705-8NM vs Recom RCM-715-8DBNM
8 differences, the largest is weight
Same series, other bin
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Recom RCM-705-8NM vs Recom RCM-715-8NM
3 differences, the largest is module efficiency
Same series, other bin
Recom
Recom RCM-705-8NM vs Recom RCM-710-8DBNM
6 differences, the largest is weight
Same series, other bin
Recom
Recom RCM-705-8NM vs Recom RCM-710-8NM
The same specification on paper
06

Written summary

07

Questions about this pairing

Which panel is better: Recom RCM-705-8NM or Recom RCM-730-8DBNM?
According to our database: Recom RCM-730-8DBNM has higher module efficiency (23.50% vs 22.70%); Recom RCM-730-8DBNM tolerates heat better (temp coeff -0.290%/°C vs -0.300%/°C). See the full spec comparison and 30-year energy simulation above for a complete picture.
What is the efficiency of Recom RCM-705-8NM and Recom RCM-730-8DBNM?
Recom RCM-705-8NM has a module efficiency of 22.70%, while Recom RCM-730-8DBNM is 23.50%. Higher efficiency means more electricity from the same roof area - useful when space is limited.
What cell technology does Recom RCM-705-8NM use vs Recom RCM-730-8DBNM?
Recom RCM-705-8NM uses TOPCon cells; Recom RCM-730-8DBNM 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 Recom RCM-705-8NM and Recom RCM-730-8DBNM?
Recom RCM-705-8NM has a 30 years power warranty; Recom RCM-730-8DBNM 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 Recom RCM-705-8NM and Recom RCM-730-8DBNM bifacial panels?
Recom RCM-730-8DBNM is bifacial (captures light from both faces); Recom RCM-705-8NM is monofacial. Bifacial panels work best on ground mounts or raised structures with a light-coloured surface underneath.

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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.