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ND66-GK725 vs ND54-GR505 5 of 19 identical Swap Change panels

TCL Zhonghuan HSM-ND66-GK725 vs TCL Zhonghuan HSM-ND54-GR505

TCL Zhonghuan
HSM-ND66-GK725
725 Wp 23.30 % N-type Bifacial
Open panel page Datasheet PDF
VS
TCL Zhonghuan
HSM-ND54-GR505
505 Wp 22.70 % TOPCon Bifacial
Open panel page Datasheet PDF
The verdict

ND66-GK725 leads on the differences that matter

The largest is rated power: 220 W more power. 5 of 19 comparable parameters are identical.

See all 14 differences
How alike are they
5 of 19 comparable
parameters are identical
identical differs
01

What actually differs

14 of 19 parameters
Parameter ND66-GK725 ND54-GR505 Difference
Rated power 725 Wp 505 Wp 220 W more power
Module efficiency 23.30 % 22.70 % 0.60 pp more efficient
Weight 38.2 kg 27.0 kg 11.2 kg lighter
Product warranty 15 yrs 25 yrs 10 yrs longer
Power density 233.4 Wp/m² 227.1 Wp/m² 6.3 Wp/m² higher
Open-circuit voltage 49.36 V 40.14 V 9.22 V apart
Short-circuit current 18.60 A 15.88 A 2.72 A apart
Module area 3.106 m² 2.224 m² 0.883 m² apart
Cell technology N-type TOPCon N-type vs TOPCon
Temperature coefficient -0.280 %/°C -0.290 %/°C 0.010 %/°C better in heat
Voltage at max power 41.27 V 33.90 V 7.37 V apart
Current at max power 17.57 A 14.90 A 2.67 A apart
Cell count 132 108 24 cells apart
Dimensions 2384x1303x33 mm 1961x1134x30 mm 2384x1303x33 mm vs 1961x1134x30 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
ND66-GK725
24,325 kWh
ND54-GR505
16,944 kWh
Lifetime gap
7,381 kWh
Output when it is hot
Rated power carried across the range a module actually sees
Scenario ND66-GK725 ND54-GR505
Standard test conditions 25 °C 100.0% of rated power 725 W 505 W
Cool, bright day 40 °C 95.7% of rated power 695 W 483 W
Typical summer roof 55 °C 91.3% of rated power 664 W 461 W
Hot roof 70 °C 87.0% of rated power 634 W 439 W
03

Full specification

Parameter ND66-GK725 ND54-GR505 Difference
Power and efficiency
Rated power 725 Wp 505 Wp +220 W for ND66-GK725
Module efficiency 23.30 % 22.70 % +0.60 pp for ND66-GK725
Power density 233.4 Wp/m² 227.1 Wp/m² +6.3 Wp/m² for ND66-GK725
Open-circuit voltage 49.36 V 40.14 V 9.22 V apart
Voltage at max power 41.27 V 33.90 V 7.37 V apart
Short-circuit current 18.60 A 15.88 A 2.72 A apart
Current at max power 17.57 A 14.90 A 2.67 A apart
Temperature
Temperature coefficient -0.280 %/°C -0.290 %/°C +0.010 %/°C for ND66-GK725
Mechanical
Dimensions 2384x1303x33 mm 1961x1134x30 mm 2384x1303x33 mm vs 1961x1134x30 mm
Module area 3.106 m² 2.224 m² 0.883 m² apart
Weight 38.2 kg 27.0 kg -11.2 kg for ND54-GR505
Weight per kWp 52.7 kg/kWp 53.5 kg/kWp Effectively the same
Warranty and degradation
Product warranty 15 yrs 25 yrs +10 yrs for ND54-GR505
Performance warranty 30 yrs 30 yrs Same
Annual degradation 0.40 %/yr 0.40 %/yr Same
Technology
Cell technology N-type TOPCon N-type vs TOPCon
Cell type Monocrystalline Monocrystalline Same
Cell count 132 108 24 cells apart
Bifacial Yes Yes Same
04

Against the whole database

14,005 panels
Efficiency
#1,017 vs #3,307
ND66-GK725 leads by 2,290 places
Power density
#936 vs #3,312
ND66-GK725 leads by 2,376 places
Heat behaviour
#1,309 vs #2,165
ND66-GK725 leads by 856 places
Weight
#6,337 vs #7,409
ND66-GK725 leads by 1,072 places
Warranty
#21 vs #21
Tied - the same position in the database
Overall
#266 vs #4,152
ND66-GK725 leads by 3,886 places
05

More useful comparisons

Open the full database
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06

Written summary

07

Questions about this pairing

Which panel is better: TCL Zhonghuan HSM-ND66-GK725 or TCL Zhonghuan HSM-ND54-GR505?
According to our database: TCL Zhonghuan HSM-ND66-GK725 has higher module efficiency (23.30% vs 22.70%); TCL Zhonghuan HSM-ND66-GK725 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 TCL Zhonghuan HSM-ND66-GK725 and TCL Zhonghuan HSM-ND54-GR505?
TCL Zhonghuan HSM-ND66-GK725 has a module efficiency of 23.30%, while TCL Zhonghuan HSM-ND54-GR505 is 22.70%. Higher efficiency means more electricity from the same roof area - useful when space is limited.
What cell technology does TCL Zhonghuan HSM-ND66-GK725 use vs TCL Zhonghuan HSM-ND54-GR505?
TCL Zhonghuan HSM-ND66-GK725 uses N-type cells; TCL Zhonghuan HSM-ND54-GR505 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 TCL Zhonghuan HSM-ND66-GK725 and TCL Zhonghuan HSM-ND54-GR505?
TCL Zhonghuan HSM-ND66-GK725 has a 30 years power warranty; TCL Zhonghuan HSM-ND54-GR505 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 TCL Zhonghuan HSM-ND66-GK725 and TCL Zhonghuan HSM-ND54-GR505 bifacial panels?
Both TCL Zhonghuan HSM-ND66-GK725 and TCL Zhonghuan HSM-ND54-GR505 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.

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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.