Suntech STP510S-H54-Nkh+ vs Suntech STP725S-D66-Nsh+
VS
The verdict
15 differences, and they point both ways
The largest is rated power: 215 W more power. 4 of 19 comparable parameters are identical.
See all 15 differencesHow alike are they
4
of 19 comparable
parameters are identical
parameters are identical
identical
differs
01
15 of 19 parameters
What actually differs
Parameter
STP510S-H54-Nkh+
STP725S-D66-Nsh+
Difference
Rated power
510 Wp
725 Wp
215 W more power
Weight
23.5 kg
37.5 kg
14.0 kg lighter
Product warranty
25 yrs
15 yrs
10 yrs longer
Module efficiency
22.90 %
23.30 %
0.40 pp more efficient
Weight per kWp
46.1 kg/kWp
51.7 kg/kWp
5.6 kg/kWp lighter
Open-circuit voltage
40.72 V
49.46 V
8.74 V apart
Short-circuit current
15.73 A
18.50 A
2.77 A apart
Module area
2.224 m²
3.106 m²
0.883 m² apart
Power density
229.3 Wp/m²
233.4 Wp/m²
4.1 Wp/m² higher
Temperature coefficient
-0.290 %/°C
-0.280 %/°C
0.010 %/°C better in heat
Voltage at max power
34.39 V
41.07 V
6.68 V apart
Current at max power
14.83 A
17.66 A
2.83 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
STP510S-H54-Nkh+
17,112 kWh
STP725S-D66-Nsh+
24,325 kWh
Lifetime gap
7,213 kWh
Output when it is hot
Rated power carried across the range a module actually sees
Scenario
STP510S-H54-Nkh+
STP725S-D66-Nsh+
Standard test conditions
25 °C
100.0% of rated power
510 W
725 W
Cool, bright day
40 °C
95.7% of rated power
488 W
695 W
Typical summer roof
55 °C
91.3% of rated power
466 W
664 W
Hot roof
70 °C
87.0% of rated power
443 W
634 W
03
Full specification
Parameter
STP510S-H54-Nkh+
STP725S-D66-Nsh+
Difference
Power and efficiency
Rated power
510 Wp
725 Wp
+215 W for STP725S-D66-Nsh+
Module efficiency
22.90 %
23.30 %
+0.40 pp for STP725S-D66-Nsh+
Power density
229.3 Wp/m²
233.4 Wp/m²
+4.1 Wp/m² for STP725S-D66-Nsh+
Open-circuit voltage
40.72 V
49.46 V
8.74 V apart
Voltage at max power
34.39 V
41.07 V
6.68 V apart
Short-circuit current
15.73 A
18.50 A
2.77 A apart
Current at max power
14.83 A
17.66 A
2.83 A apart
Temperature
Temperature coefficient
-0.290 %/°C
-0.280 %/°C
+0.010 %/°C for STP725S-D66-Nsh+
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 STP510S-H54-Nkh+
Weight per kWp
46.1 kg/kWp
51.7 kg/kWp
-5.6 kg/kWp for STP510S-H54-Nkh+
Warranty and degradation
Product warranty
25 yrs
15 yrs
+10 yrs for STP510S-H54-Nkh+
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
14,129 panels
Against the whole database
Efficiency
#2,412
vs
#1,057
STP725S-D66-Nsh+ leads by 1,355 places
Power density
#2,397
vs
#974
STP725S-D66-Nsh+ leads by 1,423 places
Heat behaviour
#2,220
vs
#1,347
STP725S-D66-Nsh+ leads by 873 places
Weight
#979
vs
#5,114
STP510S-H54-Nkh+ leads by 4,135 places
Warranty
#21
vs
#21
Tied - the same position in the database
Overall
#3,646
vs
#264
STP725S-D66-Nsh+ leads by 3,382 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 STP510S-H54-Nkh+ or Suntech STP725S-D66-Nsh+?
According to our database: Suntech STP725S-D66-Nsh+ has higher module efficiency (23.30% vs 22.90%); Suntech STP725S-D66-Nsh+ tolerates heat better (temp coeff -0.280%/°C vs -0.290%/°C). See the full spec comparison and 30-year energy simulation above for a complete picture.
What is the efficiency of Suntech STP510S-H54-Nkh+ and Suntech STP725S-D66-Nsh+?
Suntech STP510S-H54-Nkh+ has a module efficiency of 22.90%, while Suntech STP725S-D66-Nsh+ is 23.30%. Higher efficiency means more electricity from the same roof area - useful when space is limited.
What cell technology does Suntech STP510S-H54-Nkh+ use vs Suntech STP725S-D66-Nsh+?
Suntech STP510S-H54-Nkh+ uses TOPCon cells; Suntech STP725S-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 STP510S-H54-Nkh+ and Suntech STP725S-D66-Nsh+?
Suntech STP510S-H54-Nkh+ has a 30 years power warranty; Suntech STP725S-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 STP510S-H54-Nkh+ and Suntech STP725S-D66-Nsh+ bifacial panels?
Suntech STP725S-D66-Nsh+ is bifacial (captures light from both faces); Suntech STP510S-H54-Nkh+ is monofacial. Bifacial panels work best on ground mounts or raised structures with a light-coloured surface underneath.
Shop prices: See 16 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.