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Solaria PowerXT-420C-PD vs SPV670-TG12-132BD 3 of 16 identical Swap Change panels

Solaria Solaria PowerXT-420C-PD vs Solaria SPV670-TG12-132BD

Solaria
Solaria PowerXT-420C-PD
420 Wp 19.40 % Incomplete
Open panel page Datasheet PDF
VS
Solaria
SPV670-TG12-132BD
670 Wp 21.59 % TOPCon Bifacial Incomplete
Open panel page Datasheet PDF
The verdict

SPV670-TG12-132BD leads on the differences that matter

The largest is module efficiency: 2.19 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 differences
How alike are they
3 of 16 comparable
parameters are identical
identical differs not published
01

What actually differs

13 of 16 parameters
Parameter Solaria PowerXT-420C-PD SPV670-TG12-132BD Difference
Module efficiency 19.40 % 21.59 % 2.19 pp more efficient
Temperature coefficient -0.390 %/°C -0.300 %/°C 0.090 %/°C better in heat
Rated power 420 Wp 670 Wp 250 W more power
Power density 194.1 Wp/m² 215.9 Wp/m² 21.9 Wp/m² higher
Performance warranty 25 yrs 30 yrs 5 yrs longer
Weight 29.0 kg 38.0 kg 9.0 kg lighter
Weight per kWp 69.0 kg/kWp 56.7 kg/kWp 12.3 kg/kWp lighter
Product warranty 25 yrs 12 yrs 13 yrs longer
Short-circuit current 11.39 A 17.90 A 6.51 A apart
Module area 2.164 m² 3.103 m² 0.939 m² apart
Current at max power 10.82 A 17.09 A 6.27 A apart
Bifacial No Yes No vs Yes
Dimensions 1939x1116x40 mm 2383x1302x30 mm 1939x1116x40 mm vs 2383x1302x30 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
Solaria PowerXT-420C-PD
14,092 kWh
SPV670-TG12-132BD
22,480 kWh
Lifetime gap
8,388 kWh
Output when it is hot
Rated power carried across the range a module actually sees
Scenario Solaria PowerXT-420C-PD SPV670-TG12-132BD
Standard test conditions 25 °C 100.0% of rated power 420 W 670 W
Cool, bright day 40 °C 94.2% of rated power 395 W 640 W
Typical summer roof 55 °C 88.3% of rated power 371 W 610 W
Hot roof 70 °C 82.5% of rated power 346 W 580 W
03

Full specification

Parameter Solaria PowerXT-420C-PD SPV670-TG12-132BD Difference
Power and efficiency
Rated power 420 Wp 670 Wp +250 W for SPV670-TG12-132BD
Module efficiency 19.40 % 21.59 % +2.19 pp for SPV670-TG12-132BD
Power density 194.1 Wp/m² 215.9 Wp/m² +21.9 Wp/m² for SPV670-TG12-132BD
Open-circuit voltage 47.10 V 46.50 V Effectively the same
Voltage at max power 38.80 V 39.21 V Effectively the same
Short-circuit current 11.39 A 17.90 A 6.51 A apart
Current at max power 10.82 A 17.09 A 6.27 A apart
Temperature
Temperature coefficient -0.390 %/°C -0.300 %/°C +0.090 %/°C for SPV670-TG12-132BD
Mechanical
Dimensions 1939x1116x40 mm 2383x1302x30 mm 1939x1116x40 mm vs 2383x1302x30 mm
Module area 2.164 m² 3.103 m² 0.939 m² apart
Weight 29.0 kg 38.0 kg -9.0 kg for Solaria PowerXT-420C-PD
Weight per kWp 69.0 kg/kWp 56.7 kg/kWp -12.3 kg/kWp for SPV670-TG12-132BD
Warranty and degradation
Product warranty 25 yrs 12 yrs +13 yrs for Solaria PowerXT-420C-PD
Performance warranty 25 yrs 30 yrs +5 yrs for SPV670-TG12-132BD
Annual degradation - - Neither datasheet publishes this
Technology
Cell technology - TOPCon Not published by Solaria
Cell type Monocrystalline Monocrystalline Same
Cell count - 132 Not published by Solaria
Bifacial No Yes No vs Yes
04

Against the whole database

14,005 panels
Efficiency
#12,735 vs #7,726
SPV670-TG12-132BD leads by 5,009 places
Power density
#12,726 vs #7,627
SPV670-TG12-132BD leads by 5,099 places
Heat behaviour
#13,579 vs #6,093
SPV670-TG12-132BD leads by 7,486 places
Weight
#13,359 vs #10,811
SPV670-TG12-132BD leads by 2,548 places
Warranty
#9,798 vs #21
SPV670-TG12-132BD leads by 9,777 places
Overall
#11,183 vs #2,462
SPV670-TG12-132BD leads by 8,721 places
05

More useful comparisons

Open the full database
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Solaria Solaria PowerXT-420C-PD vs Solaria Solaria PowerXT-430C-PD
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Solaria Solaria PowerXT-420C-PD vs Solaria Solaria PowerXT-420C-BD
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Solaria Solaria PowerXT-420C-PD vs Solaria Solaria PowerXT-410C-BD
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Solaria SPV670-TG12-132BD vs Solaria SPV680-TG12-132BD
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Solaria SPV670-TG12-132BD vs Solaria SPV675-TG12-132BD
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Solaria SPV670-TG12-132BD vs Solaria SPV665-TG12-132BD
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06

Written summary

07

Questions about this pairing

Which panel is better: Solaria Solaria PowerXT-420C-PD or Solaria SPV670-TG12-132BD?
According to our database: Solaria SPV670-TG12-132BD has higher module efficiency (21.59% vs 19.40%); Solaria SPV670-TG12-132BD tolerates heat better (temp coeff -0.300%/°C vs -0.390%/°C). See the full spec comparison and 30-year energy simulation above for a complete picture.
What is the efficiency of Solaria Solaria PowerXT-420C-PD and Solaria SPV670-TG12-132BD?
Solaria Solaria PowerXT-420C-PD has a module efficiency of 19.40%, while Solaria SPV670-TG12-132BD is 21.59%. Higher efficiency means more electricity from the same roof area - useful when space is limited.
What cell technology does Solaria Solaria PowerXT-420C-PD use vs Solaria SPV670-TG12-132BD?
Solaria Solaria PowerXT-420C-PD uses Monocrystalline cells; Solaria SPV670-TG12-132BD uses TOPCon. 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-420C-PD and Solaria SPV670-TG12-132BD?
Solaria Solaria PowerXT-420C-PD has a 25 years power warranty; Solaria SPV670-TG12-132BD 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 Solaria Solaria PowerXT-420C-PD and Solaria SPV670-TG12-132BD bifacial panels?
Solaria SPV670-TG12-132BD is bifacial (captures light from both faces); Solaria Solaria PowerXT-420C-PD 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.