Suntech STP660S-D66/Pmh+ vs Suntech STP670S-D66/Pmh+
VS
The verdict
STP670S-D66/Pmh+ leads on the differences that matter
The largest is module efficiency: 0.40 pp more efficient. 16 of 19 comparable parameters are identical.
See all 3 differencesHow alike are they
16
of 19 comparable
parameters are identical
parameters are identical
identical
differs
01
3 of 19 parameters
What actually differs
Parameter
STP660S-D66/Pmh+
STP670S-D66/Pmh+
Difference
Module efficiency
21.20 %
21.60 %
0.40 pp more efficient
Power density
212.5 Wp/m²
215.7 Wp/m²
3.2 Wp/m² higher
Rated power
660 Wp
670 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 (-0.340 %/°C), so a warmer roof scales both curves by the same factor: the totals fall together and neither panel gains on the other.
STP660S-D66/Pmh+
21,734 kWh
STP670S-D66/Pmh+
22,064 kWh
Lifetime gap
330 kWh
Output when it is hot
Rated power carried across the range a module actually sees
Scenario
STP660S-D66/Pmh+
STP670S-D66/Pmh+
Standard test conditions
25 °C
100.0% of rated power
660 W
670 W
Cool, bright day
40 °C
94.9% of rated power
626 W
636 W
Typical summer roof
55 °C
89.8% of rated power
593 W
602 W
Hot roof
70 °C
84.7% of rated power
559 W
567 W
03
Full specification
Parameter
STP660S-D66/Pmh+
STP670S-D66/Pmh+
Difference
Power and efficiency
Rated power
660 Wp
670 Wp
+10 W for STP670S-D66/Pmh+
Module efficiency
21.20 %
21.60 %
+0.40 pp for STP670S-D66/Pmh+
Power density
212.5 Wp/m²
215.7 Wp/m²
+3.2 Wp/m² for STP670S-D66/Pmh+
Open-circuit voltage
46.05 V
46.45 V
Effectively the same
Voltage at max power
38.05 V
38.45 V
Effectively the same
Short-circuit current
18.35 A
18.43 A
Effectively the same
Current at max power
17.35 A
17.43 A
Effectively the same
Temperature
Temperature coefficient
-0.340 %/°C
-0.340 %/°C
Same
Mechanical
Dimensions
2384x1303x35 mm
2384x1303x35 mm
Same
Module area
3.106 m²
3.106 m²
Same
Weight
37.5 kg
37.5 kg
Same
Weight per kWp
56.8 kg/kWp
56.0 kg/kWp
Effectively the same
Warranty and degradation
Product warranty
15 yrs
15 yrs
Same
Performance warranty
30 yrs
30 yrs
Same
Annual degradation
0.45 %/yr
0.45 %/yr
Same
Technology
Cell technology
TOPCon
TOPCon
Same
Cell type
Monocrystalline
Monocrystalline
Same
Cell count
132
132
Same
Bifacial
Yes
Yes
Same
04
14,005 panels
Against the whole database
Efficiency
#9,076
vs
#7,652
STP670S-D66/Pmh+ leads by 1,424 places
Power density
#8,959
vs
#7,644
STP670S-D66/Pmh+ leads by 1,315 places
Heat behaviour
#8,778
vs
#8,778
Tied - the same position in the database
Weight
#10,874
vs
#10,312
STP670S-D66/Pmh+ leads by 562 places
Warranty
#21
vs
#21
Tied - the same position in the database
Overall
#2,610
vs
#1,986
STP670S-D66/Pmh+ leads by 624 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: Suntech STP660S-D66/Pmh+ or Suntech STP670S-D66/Pmh+?
According to our database: Suntech STP670S-D66/Pmh+ has higher module efficiency (21.60% vs 21.20%). See the full spec comparison and 30-year energy simulation above for a complete picture.
What is the efficiency of Suntech STP660S-D66/Pmh+ and Suntech STP670S-D66/Pmh+?
Suntech STP660S-D66/Pmh+ has a module efficiency of 21.20%, while Suntech STP670S-D66/Pmh+ is 21.60%. Higher efficiency means more electricity from the same roof area - useful when space is limited.
What cell technology does Suntech STP660S-D66/Pmh+ use vs Suntech STP670S-D66/Pmh+?
Suntech STP660S-D66/Pmh+ uses TOPCon cells; Suntech STP670S-D66/Pmh+ 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 Suntech STP660S-D66/Pmh+ and Suntech STP670S-D66/Pmh+?
Suntech STP660S-D66/Pmh+ has a 30 years power warranty; Suntech STP670S-D66/Pmh+ 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 Suntech STP660S-D66/Pmh+ and Suntech STP670S-D66/Pmh+ bifacial panels?
Both Suntech STP660S-D66/Pmh+ and Suntech STP670S-D66/Pmh+ are bifacial - they capture reflected light from the ground, which can add 5-15% more annual energy on ground-mount or elevated rooftop installations with a light surface beneath.
Shop prices: See 29 Suntech 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.