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410-BG vs 420-BG 16 of 19 identical Swap Change panels

Silfab SIL-410-BG vs Silfab SIL-420-BG

Silfab
SIL-410-BG
410 Wp 21.40 % PERC
Open panel page Datasheet PDF
VS
Silfab
SIL-420-BG
420 Wp 21.90 % PERC
Open panel page Datasheet PDF
The verdict

420-BG leads on the differences that matter

The largest is module efficiency: 0.50 pp more efficient. 16 of 19 comparable parameters are identical.

See all 3 differences
How alike are they
16 of 19 comparable
parameters are identical
identical differs
01

What actually differs

3 of 19 parameters
Parameter 410-BG 420-BG Difference
Module efficiency 21.40 % 21.90 % 0.50 pp more efficient
Power density 213.8 Wp/m² 219.0 Wp/m² 5.2 Wp/m² higher
Rated power 410 Wp 420 Wp 10 W more power
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 (-0.377 %/°C), so a warmer roof scales both curves by the same factor: the totals fall together and neither panel gains on the other.
410-BG
13,801 kWh
420-BG
14,160 kWh
Lifetime gap
359 kWh
Output when it is hot
Rated power carried across the range a module actually sees
Scenario 410-BG 420-BG
Standard test conditions 25 °C 100.0% of rated power 410 W 420 W
Cool, bright day 40 °C 94.3% of rated power 387 W 396 W
Typical summer roof 55 °C 88.7% of rated power 364 W 372 W
Hot roof 70 °C 83.0% of rated power 340 W 349 W
03

Full specification

Parameter 410-BG 420-BG Difference
Power and efficiency
Rated power 410 Wp 420 Wp +10 W for 420-BG
Module efficiency 21.40 % 21.90 % +0.50 pp for 420-BG
Power density 213.8 Wp/m² 219.0 Wp/m² +5.2 Wp/m² for 420-BG
Open-circuit voltage 45.92 V 46.36 V Effectively the same
Voltage at max power 38.08 V 38.51 V Effectively the same
Short-circuit current 11.30 A 11.40 A Effectively the same
Current at max power 10.77 A 10.91 A Effectively the same
Temperature
Temperature coefficient -0.377 %/°C -0.377 %/°C Same
Mechanical
Dimensions 1864x1029x35 mm 1864x1029x35 mm Same
Module area 1.918 m² 1.918 m² Same
Weight 20.8 kg 20.8 kg Same
Weight per kWp 50.7 kg/kWp 49.5 kg/kWp Effectively the same
Warranty and degradation
Product warranty 25 yrs 25 yrs Same
Performance warranty 30 yrs 30 yrs Same
Annual degradation 0.31 %/yr 0.30 %/yr Effectively the same
Technology
Cell technology PERC PERC Same
Cell type Monocrystalline Monocrystalline Same
Cell count 66 66 Same
Bifacial No No Same
04

Against the whole database

14,129 panels
Efficiency
#8,388 vs #6,847
420-BG leads by 1,541 places
Power density
#8,468 vs #6,850
420-BG leads by 1,618 places
Heat behaviour
#13,470 vs #13,470
Tied - the same position in the database
Weight
#4,154 vs #3,065
420-BG leads by 1,089 places
Warranty
#21 vs #21
Tied - the same position in the database
Overall
#9,073 vs #8,049
420-BG leads by 1,024 places
05

More useful comparisons

Open the full database
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Silfab SIL-410-BG vs Silfab SIL-370 BK
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Silfab SIL-410-BG vs Silfab SIL-640 XL
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Silfab SIL-410-BG vs Silfab SIL-630 XL
15 differences, the largest is module efficiency
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Silfab SIL-410-BG vs Silfab SIL-620 XL
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06

Written summary

07

Questions about this pairing

Which panel is better: Silfab SIL-410-BG or Silfab SIL-420-BG?
According to our database: Silfab SIL-420-BG has higher module efficiency (21.90% vs 21.40%). See the full spec comparison and 30-year energy simulation above for a complete picture.
What is the efficiency of Silfab SIL-410-BG and Silfab SIL-420-BG?
Silfab SIL-410-BG has a module efficiency of 21.40%, while Silfab SIL-420-BG is 21.90%. Higher efficiency means more electricity from the same roof area - useful when space is limited.
What cell technology does Silfab SIL-410-BG use vs Silfab SIL-420-BG?
Silfab SIL-410-BG uses PERC cells; Silfab SIL-420-BG uses PERC. 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 Silfab SIL-410-BG and Silfab SIL-420-BG?
Silfab SIL-410-BG has a 30 years power warranty; Silfab SIL-420-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.

Shop prices: See 2 Silfab offers

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.