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GK725 vs GK720 (IEC1500V) 16 of 18 identical Swap Change panels

TCL Zhonghuan HSM-ND66-GK725 vs TCL Zhonghuan HSM-ND66-GK720 (IEC1500V)

TCL Zhonghuan
HSM-ND66-GK725
725 Wp 23.30 % N-type Bifacial
Open panel page Datasheet PDF
VS
TCL Zhonghuan
HSM-ND66-GK720 (IEC1500V)
720 Wp 23.00 % TOPCon Bifacial Incomplete
Open panel page Datasheet PDF
The verdict

GK725 leads on the differences that matter

The largest is module efficiency: 0.30 pp more efficient. 16 of 18 comparable parameters are identical, with 1 more left out because at least one datasheet does not publish it.

See all 2 differences
How alike are they
16 of 18 comparable
parameters are identical
identical differs not published
01

What actually differs

2 of 18 parameters
Parameter GK725 GK720 (IEC1500V) Difference
Module efficiency 23.30 % 23.00 % 0.30 pp more efficient
Cell technology N-type TOPCon N-type vs TOPCon
02

What it means on a roof

Thirty years of production
Declared first-year losses, with 0.40% a year afterwards assumed for both panels, 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.
GK725
24,325 kWh
GK720 (IEC1500V)
24,157 kWh
Lifetime gap
168 kWh
Output when it is hot
Rated power carried across the range a module actually sees
Scenario GK725 GK720 (IEC1500V)
Standard test conditions 25 °C 100.0% of rated power 725 W 720 W
Cool, bright day 40 °C 95.8% of rated power 695 W 690 W
Typical summer roof 55 °C 91.6% of rated power 664 W 660 W
Hot roof 70 °C 87.4% of rated power 634 W 629 W
03

Full specification

Parameter GK725 GK720 (IEC1500V) Difference
Power and efficiency
Rated power 725 Wp 720 Wp Effectively the same
Module efficiency 23.30 % 23.00 % +0.30 pp for GK725
Power density 233.4 Wp/m² 231.8 Wp/m² Effectively the same
Open-circuit voltage 49.36 V 49.14 V Effectively the same
Voltage at max power 41.27 V 41.08 V Effectively the same
Short-circuit current 18.60 A 18.56 A Effectively the same
Current at max power 17.57 A 17.53 A Effectively the same
Temperature
Temperature coefficient -0.280 %/°C -0.280 %/°C Same
Mechanical
Dimensions 2384x1303x33 mm 2384x1303x33 mm Same
Module area 3.106 m² 3.106 m² Same
Weight 38.2 kg 38.2 kg Same
Weight per kWp 52.7 kg/kWp 53.1 kg/kWp Effectively the same
Warranty and degradation
Product warranty 15 yrs 15 yrs Same
Performance warranty 30 yrs 30 yrs Same
Annual degradation 0.40 %/yr - Not published by TCL Zhonghuan
Technology
Cell technology N-type TOPCon N-type vs TOPCon
Cell type Monocrystalline Monocrystalline Same
Cell count 132 132 Same
Bifacial Yes Yes Same
04

Against the whole database

14,005 panels
Efficiency
#1,017 vs #1,919
GK725 leads by 902 places
Power density
#936 vs #1,347
GK725 leads by 411 places
Heat behaviour
#1,309 vs #1,309
Tied - the same position in the database
Weight
#6,337 vs #6,810
GK725 leads by 473 places
Warranty
#21 vs #21
Tied - the same position in the database
Overall
#266 vs #391
GK725 leads by 125 places
05

More useful comparisons

Open the full database
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TCL Zhonghuan HSM-ND66-GK725 vs TCL Zhonghuan HSM-ND66-GK720
The same specification on paper
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TCL Zhonghuan HSM-ND66-GK725 vs TCL Zhonghuan HSM-ND66-GK715
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TCL Zhonghuan HSM-ND66-GK725 vs TCL Zhonghuan HSM-ND66-GK710
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TCL Zhonghuan HSM-ND66-GK725 vs TCL Zhonghuan HSM-ND66-GK705
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TCL Zhonghuan HSM-ND66-GK725 vs TCL Zhonghuan HSM-ND66-GK700
4 differences, the largest is module efficiency
Same series, other bin
TCL Zhonghuan
TCL Zhonghuan HSM-ND66-GK720 (IEC1500V) vs TCL Zhonghuan HSM-ND66-GK725 (IEC1500V)
One difference: module efficiency
06

Written summary

07

Questions about this pairing

Which panel is better: TCL Zhonghuan HSM-ND66-GK725 or TCL Zhonghuan HSM-ND66-GK720 (IEC1500V)?
According to our database: TCL Zhonghuan HSM-ND66-GK725 has higher module efficiency (23.30% vs 23.00%). 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-ND66-GK720 (IEC1500V)?
TCL Zhonghuan HSM-ND66-GK725 has a module efficiency of 23.30%, while TCL Zhonghuan HSM-ND66-GK720 (IEC1500V) is 23.00%. 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-ND66-GK720 (IEC1500V)?
TCL Zhonghuan HSM-ND66-GK725 uses N-type cells; TCL Zhonghuan HSM-ND66-GK720 (IEC1500V) 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-ND66-GK720 (IEC1500V)?
TCL Zhonghuan HSM-ND66-GK725 has a 30 years power warranty; TCL Zhonghuan HSM-ND66-GK720 (IEC1500V) 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-ND66-GK720 (IEC1500V) bifacial panels?
Both TCL Zhonghuan HSM-ND66-GK725 and TCL Zhonghuan HSM-ND66-GK720 (IEC1500V) 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.