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ND66-GK725 (IEC1500V) vs BD60-LA520 3 of 18 identical Swap Change panels

TCL Zhonghuan HSM-ND66-GK725 (IEC1500V) vs TCL Zhonghuan HSM-BD60-LA520

TCL Zhonghuan
HSM-ND66-GK725 (IEC1500V)
725 Wp 23.30 % TOPCon Bifacial Incomplete
Open panel page Datasheet PDF
VS
TCL Zhonghuan
HSM-BD60-LA520
520 Wp 23.50 % Back Contact
Open panel page Datasheet PDF
The verdict

BD60-LA520 leads on the differences that matter

The largest is rated power: 205 W more power. 3 of 18 comparable parameters are identical, with 1 more left out because at least one datasheet does not publish it.

See all 15 differences
How alike are they
3 of 18 comparable
parameters are identical
identical differs not published
01

What actually differs

15 of 18 parameters
Parameter ND66-GK725 (IEC1500V) BD60-LA520 Difference
Rated power 725 Wp 520 Wp 205 W more power
Weight 38.2 kg 23.5 kg 14.7 kg lighter
Product warranty 15 yrs 25 yrs 10 yrs longer
Weight per kWp 52.7 kg/kWp 45.2 kg/kWp 7.5 kg/kWp lighter
Temperature coefficient -0.280 %/°C -0.260 %/°C 0.020 %/°C better in heat
Short-circuit current 18.60 A 14.29 A 4.31 A apart
Module area 3.106 m² 2.216 m² 0.891 m² apart
Open-circuit voltage 49.36 V 45.42 V 3.94 V apart
Cell technology TOPCon Back Contact TOPCon vs Back Contact
Module efficiency 23.30 % 23.50 % 0.20 pp more efficient
Current at max power 17.57 A 13.58 A 3.99 A apart
Cell count 132 120 12 cells apart
Bifacial Yes No Yes vs No
Voltage at max power 41.27 V 38.30 V 2.97 V apart
Dimensions 2384x1303x33 mm 1954x1134x30 mm 2384x1303x33 mm vs 1954x1134x30 mm
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
ND66-GK725 (IEC1500V)
24,325 kWh
BD60-LA520
17,447 kWh
Lifetime gap
6,878 kWh
Output when it is hot
Rated power carried across the range a module actually sees
Scenario ND66-GK725 (IEC1500V) BD60-LA520
Standard test conditions 25 °C 100.0% of rated power 725 W 520 W
Cool, bright day 40 °C 95.8% of rated power 695 W 500 W
Typical summer roof 55 °C 91.6% of rated power 664 W 479 W
Hot roof 70 °C 87.4% of rated power 634 W 459 W
03

Full specification

Parameter ND66-GK725 (IEC1500V) BD60-LA520 Difference
Power and efficiency
Rated power 725 Wp 520 Wp +205 W for ND66-GK725 (IEC1500V)
Module efficiency 23.30 % 23.50 % +0.20 pp for BD60-LA520
Power density 233.4 Wp/m² 234.7 Wp/m² Effectively the same
Open-circuit voltage 49.36 V 45.42 V 3.94 V apart
Voltage at max power 41.27 V 38.30 V 2.97 V apart
Short-circuit current 18.60 A 14.29 A 4.31 A apart
Current at max power 17.57 A 13.58 A 3.99 A apart
Temperature
Temperature coefficient -0.280 %/°C -0.260 %/°C +0.020 %/°C for BD60-LA520
Mechanical
Dimensions 2384x1303x33 mm 1954x1134x30 mm 2384x1303x33 mm vs 1954x1134x30 mm
Module area 3.106 m² 2.216 m² 0.891 m² apart
Weight 38.2 kg 23.5 kg -14.7 kg for BD60-LA520
Weight per kWp 52.7 kg/kWp 45.2 kg/kWp -7.5 kg/kWp for BD60-LA520
Warranty and degradation
Product warranty 15 yrs 25 yrs +10 yrs for BD60-LA520
Performance warranty 30 yrs 30 yrs Same
Annual degradation - 0.35 %/yr Not published by TCL Zhonghuan
Technology
Cell technology TOPCon Back Contact TOPCon vs Back Contact
Cell type Monocrystalline Monocrystalline Same
Cell count 132 120 12 cells apart
Bifacial Yes No Yes vs No
04

Against the whole database

14,005 panels
Efficiency
#1,017 vs #716
BD60-LA520 leads by 301 places
Power density
#936 vs #854
BD60-LA520 leads by 82 places
Heat behaviour
#1,309 vs #511
BD60-LA520 leads by 798 places
Weight
#6,337 vs #635
BD60-LA520 leads by 5,702 places
Warranty
#21 vs #21
Tied - the same position in the database
Overall
#266 vs #2,566
ND66-GK725 (IEC1500V) leads by 2,300 places
05

More useful comparisons

Open the full database
Same series, other bin
TCL Zhonghuan
TCL Zhonghuan HSM-ND66-GK725 (IEC1500V) vs TCL Zhonghuan HSM-ND66-GK725
One difference: cell technology
Same series, other bin
TCL Zhonghuan
TCL Zhonghuan HSM-ND66-GK725 (IEC1500V) vs TCL Zhonghuan HSM-ND66-GK720 (IEC1500V)
One difference: module efficiency
Same series, other bin
TCL Zhonghuan
TCL Zhonghuan HSM-ND66-GK725 (IEC1500V) vs TCL Zhonghuan HSM-ND66-GK720
One difference: cell technology
Same series, other bin
TCL Zhonghuan
TCL Zhonghuan HSM-ND66-GK725 (IEC1500V) vs TCL Zhonghuan HSM-ND66-GK715 (IEC1500V)
3 differences, the largest is module efficiency
Same series, other bin
TCL Zhonghuan
TCL Zhonghuan HSM-ND66-GK725 (IEC1500V) vs TCL Zhonghuan HSM-ND66-GK715
4 differences, the largest is module efficiency
Same series, other bin
TCL Zhonghuan
TCL Zhonghuan HSM-ND66-GK725 (IEC1500V) vs TCL Zhonghuan HSM-ND66-GK710
4 differences, the largest is module efficiency
06

Written summary

07

Questions about this pairing

Which panel is better: TCL Zhonghuan HSM-ND66-GK725 (IEC1500V) or TCL Zhonghuan HSM-BD60-LA520?
According to our database: TCL Zhonghuan HSM-BD60-LA520 has higher module efficiency (23.50% vs 23.30%); TCL Zhonghuan HSM-BD60-LA520 tolerates heat better (temp coeff -0.260%/°C vs -0.280%/°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 (IEC1500V) and TCL Zhonghuan HSM-BD60-LA520?
TCL Zhonghuan HSM-ND66-GK725 (IEC1500V) has a module efficiency of 23.30%, while TCL Zhonghuan HSM-BD60-LA520 is 23.50%. Higher efficiency means more electricity from the same roof area - useful when space is limited.
What cell technology does TCL Zhonghuan HSM-ND66-GK725 (IEC1500V) use vs TCL Zhonghuan HSM-BD60-LA520?
TCL Zhonghuan HSM-ND66-GK725 (IEC1500V) uses TOPCon cells; TCL Zhonghuan HSM-BD60-LA520 uses Back Contact. 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 (IEC1500V) and TCL Zhonghuan HSM-BD60-LA520?
TCL Zhonghuan HSM-ND66-GK725 (IEC1500V) has a 30 years power warranty; TCL Zhonghuan HSM-BD60-LA520 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 (IEC1500V) and TCL Zhonghuan HSM-BD60-LA520 bifacial panels?
TCL Zhonghuan HSM-ND66-GK725 (IEC1500V) is bifacial (captures light from both faces); TCL Zhonghuan HSM-BD60-LA520 is monofacial. Bifacial panels work best on ground mounts or raised structures with a light-coloured surface underneath.

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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.