Solaria Solaria PowerXT-400R-PM vs Solaria PowerXT 420R-PL
VS
The verdict
9 differences, and they point both ways
The largest is rated power: 20 W more power. 8 of 17 comparable parameters are identical, with 2 more left out because at least one datasheet does not publish them.
See all 9 differencesHow alike are they
8
of 17 comparable
parameters are identical
parameters are identical
identical
differs
not published
01
9 of 17 parameters
What actually differs
Parameter
Solaria PowerXT-400R-PM
PowerXT 420R-PL
Difference
Rated power
400 Wp
420 Wp
20 W more power
Open-circuit voltage
51.10 V
45.70 V
5.40 V apart
Module area
1.979 m²
2.112 m²
0.132 m² apart
Module efficiency
20.20 %
19.90 %
0.30 pp more efficient
Short-circuit current
9.82 A
11.60 A
1.78 A apart
Power density
202.1 Wp/m²
198.9 Wp/m²
3.2 Wp/m² higher
Voltage at max power
42.40 V
37.90 V
4.50 V apart
Current at max power
9.41 A
11.09 A
1.68 A apart
Dimensions
1644x1204x40 mm
1957x1079x35 mm
1644x1204x40 mm vs 1957x1079x35 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 (-0.390 %/°C), so a warmer roof scales both curves by the same factor: the totals fall together and neither panel gains on the other.
Solaria PowerXT-400R-PM
13,110 kWh
PowerXT 420R-PL
13,765 kWh
Lifetime gap
655 kWh
Output when it is hot
Rated power carried across the range a module actually sees
Scenario
Solaria PowerXT-400R-PM
PowerXT 420R-PL
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
Solaria PowerXT-400R-PM
PowerXT 420R-PL
Difference
Power and efficiency
Rated power
400 Wp
420 Wp
+20 W for PowerXT 420R-PL
Module efficiency
20.20 %
19.90 %
+0.30 pp for Solaria PowerXT-400R-PM
Power density
202.1 Wp/m²
198.9 Wp/m²
+3.2 Wp/m² for Solaria PowerXT-400R-PM
Open-circuit voltage
51.10 V
45.70 V
5.40 V apart
Voltage at max power
42.40 V
37.90 V
4.50 V apart
Short-circuit current
9.82 A
11.60 A
1.78 A apart
Current at max power
9.41 A
11.09 A
1.68 A apart
Temperature
Temperature coefficient
-0.390 %/°C
-0.390 %/°C
Same
Mechanical
Dimensions
1644x1204x40 mm
1957x1079x35 mm
1644x1204x40 mm vs 1957x1079x35 mm
Module area
1.979 m²
2.112 m²
0.132 m² apart
Weight
21.0 kg
21.7 kg
Effectively the same
Weight per kWp
52.5 kg/kWp
51.7 kg/kWp
Effectively the same
Warranty and degradation
Product warranty
30 yrs
30 yrs
Same
Performance warranty
30 yrs
30 yrs
Same
Annual degradation
0.48 %/yr
0.48 %/yr
Same
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
#12,331
Solaria PowerXT-400R-PM leads by 375 places
Power density
#11,987
vs
#12,344
Solaria PowerXT-400R-PM leads by 357 places
Heat behaviour
#13,579
vs
#13,579
Tied - the same position in the database
Weight
#6,043
vs
#5,023
PowerXT 420R-PL leads by 1,020 places
Warranty
#21
vs
#21
Tied - the same position in the database
Overall
#9,549
vs
#9,324
PowerXT 420R-PL leads by 225 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 PowerXT 420R-PL?
According to our database: Solaria Solaria PowerXT-400R-PM has higher module efficiency (20.20% vs 19.90%). 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 PowerXT 420R-PL?
Solaria Solaria PowerXT-400R-PM has a module efficiency of 20.20%, while Solaria PowerXT 420R-PL is 19.90%. 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 PowerXT 420R-PL?
Solaria Solaria PowerXT-400R-PM uses Monocrystalline cells; Solaria PowerXT 420R-PL 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 PowerXT 420R-PL?
Solaria Solaria PowerXT-400R-PM has a 30 years power warranty; Solaria PowerXT 420R-PL 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 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.