Suntech STP665S-D66/Wmh vs Suntech STP660S-D66/Wmh
VS
The verdict
STP665S-D66/Wmh leads on the differences that matter
The largest is module efficiency: 0.20 pp more efficient. 18 of 19 comparable parameters are identical.
See the one differenceHow alike are they
18
of 19 comparable
parameters are identical
parameters are identical
identical
differs
01
1 of 19 parameters
What actually differs
Parameter
STP665S-D66/Wmh
STP660S-D66/Wmh
Difference
Module efficiency
21.40 %
21.20 %
0.20 pp more efficient
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.
STP665S-D66/Wmh
21,552 kWh
STP660S-D66/Wmh
21,390 kWh
Lifetime gap
162 kWh
Output when it is hot
Rated power carried across the range a module actually sees
Scenario
STP665S-D66/Wmh
STP660S-D66/Wmh
Standard test conditions
25 °C
100.0% of rated power
665 W
660 W
Cool, bright day
40 °C
94.9% of rated power
631 W
626 W
Typical summer roof
55 °C
89.8% of rated power
597 W
593 W
Hot roof
70 °C
84.7% of rated power
563 W
559 W
03
Full specification
Parameter
STP665S-D66/Wmh
STP660S-D66/Wmh
Difference
Power and efficiency
Rated power
665 Wp
660 Wp
Effectively the same
Module efficiency
21.40 %
21.20 %
+0.20 pp for STP665S-D66/Wmh
Power density
214.1 Wp/m²
212.5 Wp/m²
Effectively the same
Open-circuit voltage
46.25 V
46.05 V
Effectively the same
Voltage at max power
38.25 V
38.05 V
Effectively the same
Short-circuit current
18.39 A
18.35 A
Effectively the same
Current at max power
17.39 A
17.35 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
33.5 kg
33.5 kg
Same
Weight per kWp
50.4 kg/kWp
50.8 kg/kWp
Effectively the same
Warranty and degradation
Product warranty
12 yrs
12 yrs
Same
Performance warranty
25 yrs
25 yrs
Same
Annual degradation
0.55 %/yr
0.55 %/yr
Same
Technology
Cell technology
TOPCon
TOPCon
Same
Cell type
Monocrystalline
Monocrystalline
Same
Cell count
132
132
Same
Bifacial
No
No
Same
04
14,005 panels
Against the whole database
Efficiency
#8,323
vs
#9,076
STP665S-D66/Wmh leads by 753 places
Power density
#8,250
vs
#8,959
STP665S-D66/Wmh leads by 709 places
Heat behaviour
#8,778
vs
#8,778
Tied - the same position in the database
Weight
#3,742
vs
#4,172
STP665S-D66/Wmh leads by 430 places
Warranty
#9,798
vs
#9,798
Tied - the same position in the database
Overall
#3,792
vs
#4,193
STP665S-D66/Wmh leads by 401 places
05
Open the full database
More useful comparisons
Same series, other bin
Suntech STP665S-D66/Wmh vs Suntech STP700S-D66-Nsh+
12 differences, the largest is module efficiency
Same series, other bin
Suntech STP665S-D66/Wmh vs Suntech STP675S-D66/Wmh
3 differences, the largest is module efficiency
Same series, other bin
Suntech STP665S-D66/Wmh vs Suntech STP670S-D66/Wmh
One difference: module efficiency
Same series, other bin
Suntech STP665S-D66/Wmh vs Suntech STP670S-D66/Pmh+
7 differences, the largest is performance warranty
Same series, other bin
Suntech STP665S-D66/Wmh vs Suntech STP665S-D66/Pmh+
6 differences, the largest is performance warranty
Same series, other bin
Suntech STP665S-D66/Wmh vs Suntech STP660S-D66/Pmh+
7 differences, the largest is performance warranty
06
Written summary
Checking cache...
07
Questions about this pairing
Which panel is better: Suntech STP665S-D66/Wmh or Suntech STP660S-D66/Wmh?
According to our database: Suntech STP665S-D66/Wmh has higher module efficiency (21.40% vs 21.20%). See the full spec comparison and 30-year energy simulation above for a complete picture.
What is the efficiency of Suntech STP665S-D66/Wmh and Suntech STP660S-D66/Wmh?
Suntech STP665S-D66/Wmh has a module efficiency of 21.40%, while Suntech STP660S-D66/Wmh is 21.20%. Higher efficiency means more electricity from the same roof area - useful when space is limited.
What cell technology does Suntech STP665S-D66/Wmh use vs Suntech STP660S-D66/Wmh?
Suntech STP665S-D66/Wmh uses TOPCon cells; Suntech STP660S-D66/Wmh 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 STP665S-D66/Wmh and Suntech STP660S-D66/Wmh?
Suntech STP665S-D66/Wmh has a 25 years power warranty; Suntech STP660S-D66/Wmh 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 22 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.