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Solaria PowerX-390R vs SPV660-TG12-132BD 2 of 16 identical Swap Change panels

Solaria Solaria PowerX-390R vs Solaria SPV660-TG12-132BD

Solaria
Solaria PowerX-390R
390 Wp 20.00 %
Open panel page Datasheet PDF
VS
Solaria
SPV660-TG12-132BD
660 Wp 21.28 % TOPCon Bifacial Incomplete
Open panel page Datasheet PDF
The verdict

SPV660-TG12-132BD leads on the differences that matter

The largest is module efficiency: 1.28 pp more efficient. 2 of 16 comparable parameters are identical, with 3 more left out because at least one datasheet does not publish them.

See all 14 differences
How alike are they
2 of 16 comparable
parameters are identical
identical differs not published
01

What actually differs

14 of 16 parameters
Parameter Solaria PowerX-390R SPV660-TG12-132BD Difference
Module efficiency 20.00 % 21.28 % 1.28 pp more efficient
Temperature coefficient -0.360 %/°C -0.300 %/°C 0.060 %/°C better in heat
Rated power 390 Wp 660 Wp 270 W more power
Power density 199.6 Wp/m² 212.7 Wp/m² 13.1 Wp/m² higher
Performance warranty 25 yrs 30 yrs 5 yrs longer
Weight 22.1 kg 38.0 kg 15.9 kg lighter
Product warranty 25 yrs 12 yrs 13 yrs longer
Open-circuit voltage 36.90 V 46.10 V 9.20 V apart
Short-circuit current 13.52 A 17.84 A 4.32 A apart
Module area 1.954 m² 3.103 m² 1.149 m² apart
Voltage at max power 30.60 V 38.81 V 8.21 V apart
Current at max power 12.73 A 17.01 A 4.28 A apart
Bifacial No Yes No vs Yes
Dimensions 1723x1134x35 mm 2383x1302x30 mm 1723x1134x35 mm vs 2383x1302x30 mm
02

What it means on a roof

Thirty years of production
Declared first-year losses, with 0.40% a year afterwards assumed for both panels, at 1,200 kWh/kWp a year
Solaria PowerX-390R
12,945 kWh
SPV660-TG12-132BD
21,907 kWh
Lifetime gap
8,962 kWh
Output when it is hot
Rated power carried across the range a module actually sees
Scenario Solaria PowerX-390R SPV660-TG12-132BD
Standard test conditions 25 °C 100.0% of rated power 390 W 660 W
Cool, bright day 40 °C 94.6% of rated power 369 W 630 W
Typical summer roof 55 °C 89.2% of rated power 348 W 601 W
Hot roof 70 °C 83.8% of rated power 327 W 571 W
03

Full specification

Parameter Solaria PowerX-390R SPV660-TG12-132BD Difference
Power and efficiency
Rated power 390 Wp 660 Wp +270 W for SPV660-TG12-132BD
Module efficiency 20.00 % 21.28 % +1.28 pp for SPV660-TG12-132BD
Power density 199.6 Wp/m² 212.7 Wp/m² +13.1 Wp/m² for SPV660-TG12-132BD
Open-circuit voltage 36.90 V 46.10 V 9.20 V apart
Voltage at max power 30.60 V 38.81 V 8.21 V apart
Short-circuit current 13.52 A 17.84 A 4.32 A apart
Current at max power 12.73 A 17.01 A 4.28 A apart
Temperature
Temperature coefficient -0.360 %/°C -0.300 %/°C +0.060 %/°C for SPV660-TG12-132BD
Mechanical
Dimensions 1723x1134x35 mm 2383x1302x30 mm 1723x1134x35 mm vs 2383x1302x30 mm
Module area 1.954 m² 3.103 m² 1.149 m² apart
Weight 22.1 kg 38.0 kg -15.9 kg for Solaria PowerX-390R
Weight per kWp 56.7 kg/kWp 57.6 kg/kWp Effectively the same
Warranty and degradation
Product warranty 25 yrs 12 yrs +13 yrs for Solaria PowerX-390R
Performance warranty 25 yrs 30 yrs +5 yrs for SPV660-TG12-132BD
Annual degradation 0.50 %/yr - Not published by Solaria
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
#12,214 vs #8,795
SPV660-TG12-132BD leads by 3,419 places
Power density
#12,284 vs #8,718
SPV660-TG12-132BD leads by 3,566 places
Heat behaviour
#12,345 vs #6,093
SPV660-TG12-132BD leads by 6,252 places
Weight
#10,801 vs #11,284
Solaria PowerX-390R leads by 483 places
Warranty
#9,798 vs #21
SPV660-TG12-132BD leads by 9,777 places
Overall
#11,244 vs #3,149
SPV660-TG12-132BD leads by 8,095 places
05

More useful comparisons

Open the full database
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Solaria
Solaria Solaria PowerX-390R vs Solaria Solaria PowerX-400R
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Solaria Solaria PowerX-390R vs Solaria Solaria PowerX-395R
One difference: module efficiency
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Solaria SPV660-TG12-132BD vs Solaria SPV680-TG12-132BD
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Solaria SPV660-TG12-132BD vs Solaria SPV675-TG12-132BD
3 differences, the largest is module efficiency
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Solaria SPV660-TG12-132BD vs Solaria SPV670-TG12-132BD
3 differences, the largest is module efficiency
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Solaria SPV660-TG12-132BD vs Solaria SPV665-TG12-132BD
The same specification on paper
06

Written summary

07

Questions about this pairing

Which panel is better: Solaria Solaria PowerX-390R or Solaria SPV660-TG12-132BD?
According to our database: Solaria SPV660-TG12-132BD has higher module efficiency (21.28% vs 20.00%); Solaria SPV660-TG12-132BD tolerates heat better (temp coeff -0.300%/°C vs -0.360%/°C). See the full spec comparison and 30-year energy simulation above for a complete picture.
What is the efficiency of Solaria Solaria PowerX-390R and Solaria SPV660-TG12-132BD?
Solaria Solaria PowerX-390R has a module efficiency of 20.00%, while Solaria SPV660-TG12-132BD is 21.28%. Higher efficiency means more electricity from the same roof area - useful when space is limited.
What cell technology does Solaria Solaria PowerX-390R use vs Solaria SPV660-TG12-132BD?
Solaria Solaria PowerX-390R uses Monocrystalline cells; Solaria SPV660-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 PowerX-390R and Solaria SPV660-TG12-132BD?
Solaria Solaria PowerX-390R has a 25 years power warranty; Solaria SPV660-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 PowerX-390R and Solaria SPV660-TG12-132BD bifacial panels?
Solaria SPV660-TG12-132BD is bifacial (captures light from both faces); Solaria Solaria PowerX-390R 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.