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440-BTD-BG vs 705-BTC-BG 10 of 19 identical Swap Change panels

Seraphim SRP-440-BTD-BG vs Seraphim SRP-705-BTC-BG

Seraphim SRP-440-BTD-BG
SRP-440-BTD-BG
440 Wp 22.53 % TOPCon Bifacial
Open panel page Datasheet PDF
VS
Seraphim SRP-705-BTC-BG
SRP-705-BTC-BG
705 Wp 22.70 % TOPCon Bifacial
Open panel page Datasheet PDF
The verdict

9 differences, and they point both ways

The largest is rated power: 265 W more power. 10 of 19 comparable parameters are identical.

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

What actually differs

9 of 19 parameters
Parameter 440-BTD-BG 705-BTC-BG Difference
Rated power 440 Wp 705 Wp 265 W more power
Weight 24.0 kg 38.5 kg 14.5 kg lighter
Open-circuit voltage 39.30 V 48.70 V 9.40 V apart
Short-circuit current 14.15 A 18.36 A 4.21 A apart
Module area 1.953 m² 3.106 m² 1.154 m² apart
Voltage at max power 32.70 V 40.73 V 8.03 V apart
Current at max power 13.47 A 17.31 A 3.84 A apart
Cell count 108 132 24 cells apart
Dimensions 1722x1134x30 mm 2384x1303x33 mm 1722x1134x30 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
Same temp coeff. for both panels (-0.290 %/°C), so a warmer roof scales both curves by the same factor: the totals fall together and neither panel gains on the other.
440-BTD-BG
14,763 kWh
705-BTC-BG
23,654 kWh
Lifetime gap
8,891 kWh
Output when it is hot
Rated power carried across the range a module actually sees
Scenario 440-BTD-BG 705-BTC-BG
Standard test conditions 25 °C 100.0% of rated power 440 W 705 W
Cool, bright day 40 °C 95.7% of rated power 421 W 674 W
Typical summer roof 55 °C 91.3% of rated power 402 W 644 W
Hot roof 70 °C 87.0% of rated power 383 W 613 W
03

Full specification

Parameter 440-BTD-BG 705-BTC-BG Difference
Power and efficiency
Rated power 440 Wp 705 Wp +265 W for 705-BTC-BG
Module efficiency 22.53 % 22.70 % Effectively the same
Power density 225.3 Wp/m² 227.0 Wp/m² Effectively the same
Open-circuit voltage 39.30 V 48.70 V 9.40 V apart
Voltage at max power 32.70 V 40.73 V 8.03 V apart
Short-circuit current 14.15 A 18.36 A 4.21 A apart
Current at max power 13.47 A 17.31 A 3.84 A apart
Temperature
Temperature coefficient -0.290 %/°C -0.290 %/°C Same
Mechanical
Dimensions 1722x1134x30 mm 2384x1303x33 mm 1722x1134x30 mm vs 2384x1303x33 mm
Module area 1.953 m² 3.106 m² 1.154 m² apart
Weight 24.0 kg 38.5 kg -14.5 kg for 440-BTD-BG
Weight per kWp 54.5 kg/kWp 54.6 kg/kWp Effectively the same
Warranty and degradation
Product warranty 15 yrs 15 yrs Same
Performance warranty 30 yrs 30 yrs Same
Annual degradation 0.40 %/yr 0.40 %/yr Same
Technology
Cell technology TOPCon TOPCon Same
Cell type Monocrystalline Monocrystalline Same
Cell count 108 132 24 cells apart
Bifacial Yes Yes Same
04

Against the whole database

14,129 panels
Efficiency
#4,041 vs #3,364
705-BTC-BG leads by 677 places
Power density
#4,158 vs #3,418
705-BTC-BG leads by 740 places
Heat behaviour
#2,220 vs #2,220
Tied - the same position in the database
Weight
#8,953 vs #9,041
440-BTD-BG leads by 88 places
Warranty
#21 vs #21
Tied - the same position in the database
Overall
#8,866 vs #783
705-BTC-BG leads by 8,083 places
05

More useful comparisons

Open the full database
Same series, other bin
Seraphim SRP-440-BTD-BG vs Seraphim SRP-720-BTC-BG
11 differences, the largest is module efficiency
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Seraphim SRP-440-BTD-BG vs Seraphim SRP-715-BTC-BG
11 differences, the largest is rated power
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Seraphim SRP-440-BTD-BG vs Seraphim SRP-710-BTC-BG
11 differences, the largest is rated power
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Seraphim SRP-440-BTD-BG vs Seraphim SRP-700-BTC-BG
9 differences, the largest is rated power
Same series, other bin
Seraphim SRP-440-BTD-BG vs Seraphim SRP-695-BTC-BG
9 differences, the largest is rated power
Same series, other bin
Seraphim SRP-440-BTD-BG vs Seraphim SRP-690-BTC-BG
11 differences, the largest is rated power
06

Written summary

07

Questions about this pairing

Which panel is better: Seraphim SRP-440-BTD-BG or Seraphim SRP-705-BTC-BG?
According to our database: Seraphim SRP-705-BTC-BG has higher module efficiency (22.70% vs 22.53%). See the full spec comparison and 30-year energy simulation above for a complete picture.
What is the efficiency of Seraphim SRP-440-BTD-BG and Seraphim SRP-705-BTC-BG?
Seraphim SRP-440-BTD-BG has a module efficiency of 22.53%, while Seraphim SRP-705-BTC-BG is 22.70%. Higher efficiency means more electricity from the same roof area - useful when space is limited.
What cell technology does Seraphim SRP-440-BTD-BG use vs Seraphim SRP-705-BTC-BG?
Seraphim SRP-440-BTD-BG uses TOPCon cells; Seraphim SRP-705-BTC-BG 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 Seraphim SRP-440-BTD-BG and Seraphim SRP-705-BTC-BG?
Seraphim SRP-440-BTD-BG has a 30 years power warranty; Seraphim SRP-705-BTC-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-440-BTD-BG and Seraphim SRP-705-BTC-BG bifacial panels?
Both Seraphim SRP-440-BTD-BG and Seraphim SRP-705-BTC-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.