Suntech STP505S-H54-Nfb+ vs Suntech STP720S-D66-Nsh+
VS
The verdict
14 differences, and they point both ways
The largest is rated power: 215 W more power. 5 of 19 comparable parameters are identical.
See all 14 differencesHow alike are they
5
of 19 comparable
parameters are identical
parameters are identical
identical
differs
01
14 of 19 parameters
What actually differs
Parameter
STP505S-H54-Nfb+
STP720S-D66-Nsh+
Difference
Rated power
505 Wp
720 Wp
215 W more power
Module efficiency
22.70 %
23.20 %
0.50 pp more efficient
Weight
23.5 kg
37.5 kg
14.0 kg lighter
Product warranty
25 yrs
15 yrs
10 yrs longer
Weight per kWp
46.5 kg/kWp
52.1 kg/kWp
5.5 kg/kWp lighter
Open-circuit voltage
40.55 V
49.26 V
8.71 V apart
Short-circuit current
15.68 A
18.46 A
2.78 A apart
Module area
2.224 m²
3.106 m²
0.883 m² apart
Power density
227.1 Wp/m²
231.8 Wp/m²
4.7 Wp/m² higher
Voltage at max power
34.17 V
40.87 V
6.70 V apart
Current at max power
14.78 A
17.62 A
2.84 A apart
Cell count
108
132
24 cells apart
Bifacial
No
Yes
No vs Yes
Dimensions
1961x1134x30 mm
2384x1303x33 mm
1961x1134x30 mm vs 2384x1303x33 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 (-0.280 %/°C), so a warmer roof scales both curves by the same factor: the totals fall together and neither panel gains on the other.
STP505S-H54-Nfb+
16,944 kWh
STP720S-D66-Nsh+
24,157 kWh
Lifetime gap
7,213 kWh
Output when it is hot
Rated power carried across the range a module actually sees
Scenario
STP505S-H54-Nfb+
STP720S-D66-Nsh+
Standard test conditions
25 °C
100.0% of rated power
505 W
720 W
Cool, bright day
40 °C
95.8% of rated power
484 W
690 W
Typical summer roof
55 °C
91.6% of rated power
463 W
660 W
Hot roof
70 °C
87.4% of rated power
441 W
629 W
03
Full specification
Parameter
STP505S-H54-Nfb+
STP720S-D66-Nsh+
Difference
Power and efficiency
Rated power
505 Wp
720 Wp
+215 W for STP720S-D66-Nsh+
Module efficiency
22.70 %
23.20 %
+0.50 pp for STP720S-D66-Nsh+
Power density
227.1 Wp/m²
231.8 Wp/m²
+4.7 Wp/m² for STP720S-D66-Nsh+
Open-circuit voltage
40.55 V
49.26 V
8.71 V apart
Voltage at max power
34.17 V
40.87 V
6.70 V apart
Short-circuit current
15.68 A
18.46 A
2.78 A apart
Current at max power
14.78 A
17.62 A
2.84 A apart
Temperature
Temperature coefficient
-0.280 %/°C
-0.280 %/°C
Same
Mechanical
Dimensions
1961x1134x30 mm
2384x1303x33 mm
1961x1134x30 mm vs 2384x1303x33 mm
Module area
2.224 m²
3.106 m²
0.883 m² apart
Weight
23.5 kg
37.5 kg
-14.0 kg for STP505S-H54-Nfb+
Weight per kWp
46.5 kg/kWp
52.1 kg/kWp
-5.5 kg/kWp for STP505S-H54-Nfb+
Warranty and degradation
Product warranty
25 yrs
15 yrs
+10 yrs for STP505S-H54-Nfb+
Performance warranty
30 yrs
30 yrs
Same
Annual degradation
0.40 %/yr
0.40 %/yr
Same
Technology
Cell technology
TOPCon
TOPCon
Same
Cell type
Monocrystalline
Monocrystalline
Same
Cell count
108
132
24 cells apart
Bifacial
No
Yes
No vs Yes
04
14,005 panels
Against the whole database
Efficiency
#3,307
vs
#1,306
STP720S-D66-Nsh+ leads by 2,001 places
Power density
#3,312
vs
#1,347
STP720S-D66-Nsh+ leads by 1,965 places
Heat behaviour
#1,309
vs
#1,309
Tied - the same position in the database
Weight
#1,199
vs
#5,516
STP505S-H54-Nfb+ leads by 4,317 places
Warranty
#21
vs
#21
Tied - the same position in the database
Overall
#4,015
vs
#330
STP720S-D66-Nsh+ leads by 3,685 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 STP505S-H54-Nfb+ or Suntech STP720S-D66-Nsh+?
According to our database: Suntech STP720S-D66-Nsh+ has higher module efficiency (23.20% vs 22.70%). See the full spec comparison and 30-year energy simulation above for a complete picture.
What is the efficiency of Suntech STP505S-H54-Nfb+ and Suntech STP720S-D66-Nsh+?
Suntech STP505S-H54-Nfb+ has a module efficiency of 22.70%, while Suntech STP720S-D66-Nsh+ is 23.20%. Higher efficiency means more electricity from the same roof area - useful when space is limited.
What cell technology does Suntech STP505S-H54-Nfb+ use vs Suntech STP720S-D66-Nsh+?
Suntech STP505S-H54-Nfb+ uses TOPCon cells; Suntech STP720S-D66-Nsh+ 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 STP505S-H54-Nfb+ and Suntech STP720S-D66-Nsh+?
Suntech STP505S-H54-Nfb+ has a 30 years power warranty; Suntech STP720S-D66-Nsh+ 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 STP505S-H54-Nfb+ and Suntech STP720S-D66-Nsh+ bifacial panels?
Suntech STP720S-D66-Nsh+ is bifacial (captures light from both faces); Suntech STP505S-H54-Nfb+ is monofacial. Bifacial panels work best on ground mounts or raised structures with a light-coloured surface underneath.
Shop prices: See 30 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.