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630 XL vs 420-BG 4 of 19 identical Swap Change panels

Silfab SIL-630 XL vs Silfab SIL-420-BG

Silfab
SIL-630 XL
630 Wp 22.56 % N-type Bifacial
Open panel page Datasheet PDF
VS
Silfab
SIL-420-BG
420 Wp 21.90 % PERC
Open panel page Datasheet PDF
The verdict

630 XL leads on the differences that matter

The largest is temperature coefficient: 0.087 %/°C better in heat. 4 of 19 comparable parameters are identical.

See all 15 differences
How alike are they
4 of 19 comparable
parameters are identical
identical differs
01

What actually differs

15 of 19 parameters
Parameter 630 XL 420-BG Difference
Temperature coefficient -0.290 %/°C -0.377 %/°C 0.087 %/°C better in heat
Module efficiency 22.56 % 21.90 % 0.66 pp more efficient
Rated power 630 Wp 420 Wp 210 W more power
Weight 29.5 kg 20.8 kg 8.7 kg lighter
Power density 225.6 Wp/m² 219.0 Wp/m² 6.6 Wp/m² higher
Open-circuit voltage 57.49 V 46.36 V 11.13 V apart
Short-circuit current 13.66 A 11.40 A 2.26 A apart
Module area 2.793 m² 1.918 m² 0.875 m² apart
Cell technology N-type PERC N-type vs PERC
Weight per kWp 46.8 kg/kWp 49.5 kg/kWp 2.7 kg/kWp lighter
Voltage at max power 48.47 V 38.51 V 9.96 V apart
Current at max power 13.00 A 10.91 A 2.09 A apart
Cell count 156 66 90 cells apart
Bifacial Yes No Yes vs No
Dimensions 2465x1133x35 mm 1864x1029x35 mm 2465x1133x35 mm vs 1864x1029x35 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
630 XL
21,240 kWh
420-BG
14,160 kWh
Lifetime gap
7,080 kWh
Output when it is hot
Rated power carried across the range a module actually sees
Scenario 630 XL 420-BG
Standard test conditions 25 °C 100.0% of rated power 630 W 420 W
Cool, bright day 40 °C 94.3% of rated power 603 W 396 W
Typical summer roof 55 °C 88.7% of rated power 575 W 372 W
Hot roof 70 °C 83.0% of rated power 548 W 349 W
03

Full specification

Parameter 630 XL 420-BG Difference
Power and efficiency
Rated power 630 Wp 420 Wp +210 W for 630 XL
Module efficiency 22.56 % 21.90 % +0.66 pp for 630 XL
Power density 225.6 Wp/m² 219.0 Wp/m² +6.6 Wp/m² for 630 XL
Open-circuit voltage 57.49 V 46.36 V 11.13 V apart
Voltage at max power 48.47 V 38.51 V 9.96 V apart
Short-circuit current 13.66 A 11.40 A 2.26 A apart
Current at max power 13.00 A 10.91 A 2.09 A apart
Temperature
Temperature coefficient -0.290 %/°C -0.377 %/°C +0.087 %/°C for 630 XL
Mechanical
Dimensions 2465x1133x35 mm 1864x1029x35 mm 2465x1133x35 mm vs 1864x1029x35 mm
Module area 2.793 m² 1.918 m² 0.875 m² apart
Weight 29.5 kg 20.8 kg -8.7 kg for 420-BG
Weight per kWp 46.8 kg/kWp 49.5 kg/kWp -2.7 kg/kWp for 630 XL
Warranty and degradation
Product warranty 25 yrs 25 yrs Same
Performance warranty 30 yrs 30 yrs Same
Annual degradation 0.30 %/yr 0.30 %/yr Same
Technology
Cell technology N-type PERC N-type vs PERC
Cell type Monocrystalline Monocrystalline Same
Cell count 156 66 90 cells apart
Bifacial Yes No Yes vs No
04

Against the whole database

14,129 panels
Efficiency
#3,959 vs #6,847
630 XL leads by 2,888 places
Power density
#3,927 vs #6,850
630 XL leads by 2,923 places
Heat behaviour
#2,220 vs #13,470
630 XL leads by 11,250 places
Weight
#1,365 vs #3,065
630 XL leads by 1,700 places
Warranty
#21 vs #21
Tied - the same position in the database
Overall
#1,047 vs #8,049
630 XL leads by 7,002 places
05

More useful comparisons

Open the full database
Same series, other bin
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Silfab SIL-630 XL vs Silfab SIL-640 XL
3 differences, the largest is module efficiency
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Silfab SIL-630 XL vs Silfab SIL-620 XL
3 differences, the largest is module efficiency
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Silfab
Silfab SIL-420-BG vs Silfab SIL-430 BG+
9 differences, the largest is module efficiency
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Silfab
Silfab SIL-420-BG vs Silfab SIL-410-BG
3 differences, the largest is module efficiency
Same series, other bin
Silfab
Silfab SIL-420-BG vs Silfab SIL-380 BK
10 differences, the largest is rated power
Same series, other bin
Silfab
Silfab SIL-420-BG vs Silfab SIL-370 BK
10 differences, the largest is module efficiency
06

Written summary

07

Questions about this pairing

Which panel is better: Silfab SIL-630 XL or Silfab SIL-420-BG?
According to our database: Silfab SIL-630 XL has higher module efficiency (22.56% vs 21.90%); Silfab SIL-630 XL tolerates heat better (temp coeff -0.290%/°C vs -0.377%/°C). See the full spec comparison and 30-year energy simulation above for a complete picture.
What is the efficiency of Silfab SIL-630 XL and Silfab SIL-420-BG?
Silfab SIL-630 XL has a module efficiency of 22.56%, 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-630 XL use vs Silfab SIL-420-BG?
Silfab SIL-630 XL uses N-type 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-630 XL and Silfab SIL-420-BG?
Silfab SIL-630 XL 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.
Are Silfab SIL-630 XL and Silfab SIL-420-BG bifacial panels?
Silfab SIL-630 XL is bifacial (captures light from both faces); Silfab SIL-420-BG 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.