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370 BK vs 380 BK 16 of 19 identical Swap Change panels

Silfab SIL-370 BK vs Silfab SIL-380 BK

Silfab
SIL-370 BK
370 Wp 20.80 % PERC
Open panel page Datasheet PDF
VS
Silfab
SIL-380 BK
380 Wp 21.40 % PERC
Open panel page Datasheet PDF
The verdict

380 BK leads on the differences that matter

The largest is module efficiency: 0.60 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 370 BK 380 BK Difference
Module efficiency 20.80 % 21.40 % 0.60 pp more efficient
Power density 208.2 Wp/m² 213.8 Wp/m² 5.6 Wp/m² higher
Rated power 370 Wp 380 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.
370 BK
11,968 kWh
380 BK
12,291 kWh
Lifetime gap
323 kWh
Output when it is hot
Rated power carried across the range a module actually sees
Scenario 370 BK 380 BK
Standard test conditions 25 °C 100.0% of rated power 370 W 380 W
Cool, bright day 40 °C 94.3% of rated power 349 W 359 W
Typical summer roof 55 °C 88.7% of rated power 328 W 337 W
Hot roof 70 °C 83.0% of rated power 307 W 316 W
03

Full specification

Parameter 370 BK 380 BK Difference
Power and efficiency
Rated power 370 Wp 380 Wp +10 W for 380 BK
Module efficiency 20.80 % 21.40 % +0.60 pp for 380 BK
Power density 208.2 Wp/m² 213.8 Wp/m² +5.6 Wp/m² for 380 BK
Open-circuit voltage 44.76 V 45.13 V Effectively the same
Voltage at max power 38.34 V 38.88 V Effectively the same
Short-circuit current 10.33 A 10.50 A Effectively the same
Current at max power 9.69 A 9.79 A Effectively the same
Temperature
Temperature coefficient -0.377 %/°C -0.377 %/°C Same
Mechanical
Dimensions 1795x990x38 mm 1795x990x38 mm Same
Module area 1.777 m² 1.777 m² Same
Weight 19.0 kg 19.0 kg Same
Weight per kWp 51.4 kg/kWp 50.0 kg/kWp Effectively the same
Warranty and degradation
Product warranty 25 yrs 25 yrs Same
Performance warranty 30 yrs 30 yrs Same
Annual degradation 0.50 %/yr 0.50 %/yr 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
#10,533 vs #8,388
380 BK leads by 2,145 places
Power density
#10,528 vs #8,409
380 BK leads by 2,119 places
Heat behaviour
#13,470 vs #13,470
Tied - the same position in the database
Weight
#4,742 vs #3,329
380 BK leads by 1,413 places
Warranty
#21 vs #21
Tied - the same position in the database
Overall
#10,529 vs #9,853
380 BK leads by 676 places
05

More useful comparisons

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

Written summary

07

Questions about this pairing

Which panel is better: Silfab SIL-370 BK or Silfab SIL-380 BK?
According to our database: Silfab SIL-380 BK has higher module efficiency (21.40% vs 20.80%). See the full spec comparison and 30-year energy simulation above for a complete picture.
What is the efficiency of Silfab SIL-370 BK and Silfab SIL-380 BK?
Silfab SIL-370 BK has a module efficiency of 20.80%, while Silfab SIL-380 BK is 21.40%. Higher efficiency means more electricity from the same roof area - useful when space is limited.
What cell technology does Silfab SIL-370 BK use vs Silfab SIL-380 BK?
Silfab SIL-370 BK uses PERC cells; Silfab SIL-380 BK 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-370 BK and Silfab SIL-380 BK?
Silfab SIL-370 BK has a 30 years power warranty; Silfab SIL-380 BK 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.