Solaria Solaria PowerXT-400R-PM vs Solaria Solaria PowerXT-420C-BD
VS
The verdict
400R-PM leads on the differences that matter
The largest is module efficiency: 0.80 pp more efficient. 3 of 16 comparable parameters are identical, with 3 more left out because at least one datasheet does not publish them.
See all 13 differencesHow alike are they
3
of 16 comparable
parameters are identical
parameters are identical
identical
differs
not published
01
13 of 16 parameters
What actually differs
Parameter
400R-PM
420C-BD
Difference
Module efficiency
20.20 %
19.40 %
0.80 pp more efficient
Performance warranty
30 yrs
25 yrs
5 yrs longer
Weight
21.0 kg
29.0 kg
8.0 kg lighter
Weight per kWp
52.5 kg/kWp
69.0 kg/kWp
16.5 kg/kWp lighter
Product warranty
30 yrs
25 yrs
5 yrs longer
Power density
202.1 Wp/m²
194.1 Wp/m²
8.0 Wp/m² higher
Rated power
400 Wp
420 Wp
20 W more power
Module area
1.979 m²
2.164 m²
0.185 m² apart
Open-circuit voltage
51.10 V
47.40 V
3.70 V apart
Short-circuit current
9.82 A
11.33 A
1.51 A apart
Voltage at max power
42.40 V
39.10 V
3.30 V apart
Current at max power
9.41 A
10.77 A
1.36 A apart
Dimensions
1644x1204x40 mm
1939x1116x40 mm
1644x1204x40 mm vs 1939x1116x40 mm
02
What it means on a roof
Thirty years of production
A 1.0% first-year loss then 0.40% a year, assumed for both panels, at 1,200 kWh/kWp a year
Same temp coeff. for both panels (-0.390 %/°C), so a warmer roof scales both curves by the same factor: the totals fall together and neither panel gains on the other.
400R-PM
13,421 kWh
420C-BD
14,092 kWh
Lifetime gap
671 kWh
Output when it is hot
Rated power carried across the range a module actually sees
Scenario
400R-PM
420C-BD
Standard test conditions
25 °C
100.0% of rated power
400 W
420 W
Cool, bright day
40 °C
94.2% of rated power
377 W
395 W
Typical summer roof
55 °C
88.3% of rated power
353 W
371 W
Hot roof
70 °C
82.5% of rated power
330 W
346 W
03
Full specification
Parameter
400R-PM
420C-BD
Difference
Power and efficiency
Rated power
400 Wp
420 Wp
+20 W for 420C-BD
Module efficiency
20.20 %
19.40 %
+0.80 pp for 400R-PM
Power density
202.1 Wp/m²
194.1 Wp/m²
+8.0 Wp/m² for 400R-PM
Open-circuit voltage
51.10 V
47.40 V
3.70 V apart
Voltage at max power
42.40 V
39.10 V
3.30 V apart
Short-circuit current
9.82 A
11.33 A
1.51 A apart
Current at max power
9.41 A
10.77 A
1.36 A apart
Temperature
Temperature coefficient
-0.390 %/°C
-0.390 %/°C
Same
Mechanical
Dimensions
1644x1204x40 mm
1939x1116x40 mm
1644x1204x40 mm vs 1939x1116x40 mm
Module area
1.979 m²
2.164 m²
0.185 m² apart
Weight
21.0 kg
29.0 kg
-8.0 kg for 400R-PM
Weight per kWp
52.5 kg/kWp
69.0 kg/kWp
-16.5 kg/kWp for 400R-PM
Warranty and degradation
Product warranty
30 yrs
25 yrs
+5 yrs for 400R-PM
Performance warranty
30 yrs
25 yrs
+5 yrs for 400R-PM
Annual degradation
0.48 %/yr
-
Not published by Solaria
Technology
Cell technology
-
-
Neither datasheet publishes this
Cell type
Monocrystalline
Monocrystalline
Same
Cell count
-
-
Neither datasheet publishes this
Bifacial
No
No
Same
04
14,005 panels
Against the whole database
Efficiency
#11,956
vs
#12,735
400R-PM leads by 779 places
Power density
#11,987
vs
#12,726
400R-PM leads by 739 places
Heat behaviour
#13,579
vs
#13,579
Tied - the same position in the database
Weight
#6,043
vs
#13,359
400R-PM leads by 7,316 places
Warranty
#21
vs
#9,798
400R-PM leads by 9,777 places
Overall
#9,549
vs
#11,183
400R-PM leads by 1,634 places
05
Open the full database
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06
Written summary
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07
Questions about this pairing
Which panel is better: Solaria Solaria PowerXT-400R-PM or Solaria Solaria PowerXT-420C-BD?
According to our database: Solaria Solaria PowerXT-400R-PM has higher module efficiency (20.20% vs 19.40%). See the full spec comparison and 30-year energy simulation above for a complete picture.
What is the efficiency of Solaria Solaria PowerXT-400R-PM and Solaria Solaria PowerXT-420C-BD?
Solaria Solaria PowerXT-400R-PM has a module efficiency of 20.20%, while Solaria Solaria PowerXT-420C-BD is 19.40%. Higher efficiency means more electricity from the same roof area - useful when space is limited.
What cell technology does Solaria Solaria PowerXT-400R-PM use vs Solaria Solaria PowerXT-420C-BD?
Solaria Solaria PowerXT-400R-PM uses Monocrystalline cells; Solaria Solaria PowerXT-420C-BD uses Monocrystalline. 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 Solaria Solaria PowerXT-400R-PM and Solaria Solaria PowerXT-420C-BD?
Solaria Solaria PowerXT-400R-PM has a 30 years power warranty; Solaria Solaria PowerXT-420C-BD has a 25 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 1 Solaria offer
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.