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685-BTC-BG vs 720-BHC-BG 9 of 19 identical Swap Change panels

Seraphim SRP-685-BTC-BG vs Seraphim SRP-720-BHC-BG

SRP-685-BTC-BG
685 Wp 22.05 % TOPCon Bifacial
Open panel page Datasheet PDF
VS
Seraphim SRP-720-BHC-BG
SRP-720-BHC-BG
720 Wp 23.18 % HJT Bifacial
Open panel page Datasheet PDF
The verdict

720-BHC-BG leads on the differences that matter

The largest is module efficiency: 1.13 pp more efficient. 9 of 19 comparable parameters are identical.

See all 10 differences
How alike are they
9 of 19 comparable
parameters are identical
identical differs
01

What actually differs

10 of 19 parameters
Parameter 685-BTC-BG 720-BHC-BG Difference
Module efficiency 22.05 % 23.18 % 1.13 pp more efficient
Temperature coefficient -0.290 %/°C -0.258 %/°C 0.032 %/°C better in heat
Power density 220.5 Wp/m² 231.8 Wp/m² 11.3 Wp/m² higher
Rated power 685 Wp 720 Wp 35 W more power
Annual degradation 0.40 %/yr 0.30 %/yr 0.10 %/yr slower
Open-circuit voltage 47.90 V 50.80 V 2.90 V apart
Cell technology TOPCon HJT TOPCon vs HJT
Weight per kWp 56.2 kg/kWp 53.5 kg/kWp 2.7 kg/kWp lighter
Voltage at max power 39.93 V 42.78 V 2.85 V apart
Short-circuit current 18.20 A 17.68 A 0.52 A apart
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
685-BTC-BG
22,983 kWh
720-BHC-BG
24,533 kWh
Lifetime gap
1,550 kWh
Output when it is hot
Rated power carried across the range a module actually sees
Scenario 685-BTC-BG 720-BHC-BG
Standard test conditions 25 °C 100.0% of rated power 685 W 720 W
Cool, bright day 40 °C 95.7% of rated power 655 W 692 W
Typical summer roof 55 °C 91.3% of rated power 625 W 664 W
Hot roof 70 °C 87.0% of rated power 596 W 636 W
03

Full specification

Parameter 685-BTC-BG 720-BHC-BG Difference
Power and efficiency
Rated power 685 Wp 720 Wp +35 W for 720-BHC-BG
Module efficiency 22.05 % 23.18 % +1.13 pp for 720-BHC-BG
Power density 220.5 Wp/m² 231.8 Wp/m² +11.3 Wp/m² for 720-BHC-BG
Open-circuit voltage 47.90 V 50.80 V 2.90 V apart
Voltage at max power 39.93 V 42.78 V 2.85 V apart
Short-circuit current 18.20 A 17.68 A 0.52 A apart
Current at max power 17.16 A 16.88 A Effectively the same
Temperature
Temperature coefficient -0.290 %/°C -0.258 %/°C +0.032 %/°C for 720-BHC-BG
Mechanical
Dimensions 2384x1303x33 mm 2384x1303x33 mm Same
Module area 3.106 m² 3.106 m² Same
Weight 38.5 kg 38.5 kg Same
Weight per kWp 56.2 kg/kWp 53.5 kg/kWp -2.7 kg/kWp for 720-BHC-BG
Warranty and degradation
Product warranty 15 yrs 15 yrs Same
Performance warranty 30 yrs 30 yrs Same
Annual degradation 0.40 %/yr 0.30 %/yr -0.10 %/yr for 720-BHC-BG
Technology
Cell technology TOPCon HJT TOPCon vs HJT
Cell type Monocrystalline Monocrystalline Same
Cell count 132 132 Same
Bifacial Yes Yes Same
04

Against the whole database

14,005 panels
Efficiency
#6,233 vs #1,424
720-BHC-BG leads by 4,809 places
Power density
#6,208 vs #1,347
720-BHC-BG leads by 4,861 places
Heat behaviour
#2,165 vs #466
720-BHC-BG leads by 1,699 places
Weight
#10,487 vs #7,424
720-BHC-BG leads by 3,063 places
Warranty
#21 vs #21
Tied - the same position in the database
Overall
#1,444 vs #362
720-BHC-BG leads by 1,082 places
05

More useful comparisons

Open the full database
Same series, other bin
Seraphim SRP-685-BTC-BG vs Seraphim SRP-690-BTC-BG
The same specification on paper
Same series, other bin
Seraphim SRP-720-BHC-BG vs Seraphim SRP-730-BHC-BG
3 differences, the largest is module efficiency
Same series, other bin
Seraphim SRP-720-BHC-BG vs Seraphim SRP-725-BHC-BG
The same specification on paper
Same series, other bin
Seraphim SRP-720-BHC-BG vs Seraphim SRP-715-BHC-BG
The same specification on paper
Same series, other bin
Seraphim SRP-720-BHC-BG vs Seraphim SRP-710-BHC-BG
3 differences, the largest is module efficiency
Same series, other bin
Seraphim SRP-720-BHC-BG vs Seraphim SRP-705-BHC-BG
3 differences, the largest is module efficiency
06

Written summary

07

Questions about this pairing

Which panel is better: Seraphim SRP-685-BTC-BG or Seraphim SRP-720-BHC-BG?
According to our database: Seraphim SRP-720-BHC-BG has higher module efficiency (23.18% vs 22.05%); Seraphim SRP-720-BHC-BG tolerates heat better (temp coeff -0.258%/°C vs -0.290%/°C). See the full spec comparison and 30-year energy simulation above for a complete picture.
What is the efficiency of Seraphim SRP-685-BTC-BG and Seraphim SRP-720-BHC-BG?
Seraphim SRP-685-BTC-BG has a module efficiency of 22.05%, while Seraphim SRP-720-BHC-BG is 23.18%. Higher efficiency means more electricity from the same roof area - useful when space is limited.
What cell technology does Seraphim SRP-685-BTC-BG use vs Seraphim SRP-720-BHC-BG?
Seraphim SRP-685-BTC-BG uses TOPCon cells; Seraphim SRP-720-BHC-BG uses HJT. 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 Seraphim SRP-685-BTC-BG and Seraphim SRP-720-BHC-BG?
Seraphim SRP-685-BTC-BG has a 30 years power warranty; Seraphim SRP-720-BHC-BG 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 Seraphim SRP-685-BTC-BG and Seraphim SRP-720-BHC-BG bifacial panels?
Both Seraphim SRP-685-BTC-BG and Seraphim SRP-720-BHC-BG 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.

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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.