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BD54-WA470 vs ND66-GK725 3 of 19 identical Swap Change panels

TCL Zhonghuan HSM-BD54-WA470 vs TCL Zhonghuan HSM-ND66-GK725

TCL Zhonghuan
HSM-BD54-WA470
470 Wp 23.60 % Back Contact
Open panel page Datasheet PDF
VS
TCL Zhonghuan
HSM-ND66-GK725
725 Wp 23.30 % N-type Bifacial
Open panel page Datasheet PDF
The verdict

BD54-WA470 leads on the differences that matter

The largest is rated power: 255 W more power. 3 of 19 comparable parameters are identical.

See all 16 differences
How alike are they
3 of 19 comparable
parameters are identical
identical differs
01

What actually differs

16 of 19 parameters
Parameter BD54-WA470 ND66-GK725 Difference
Rated power 470 Wp 725 Wp 255 W more power
Weight 21.5 kg 38.2 kg 16.7 kg lighter
Product warranty 25 yrs 15 yrs 10 yrs longer
Weight per kWp 45.7 kg/kWp 52.7 kg/kWp 6.9 kg/kWp lighter
Temperature coefficient -0.260 %/°C -0.280 %/°C 0.020 %/°C better in heat
Open-circuit voltage 41.18 V 49.36 V 8.18 V apart
Short-circuit current 14.32 A 18.60 A 4.28 A apart
Module area 1.992 m² 3.106 m² 1.114 m² apart
Module efficiency 23.60 % 23.30 % 0.30 pp more efficient
Cell technology Back Contact N-type Back Contact vs N-type
Annual degradation 0.35 %/yr 0.40 %/yr 0.05 %/yr slower
Voltage at max power 34.74 V 41.27 V 6.53 V apart
Current at max power 13.54 A 17.57 A 4.03 A apart
Cell count 108 132 24 cells apart
Bifacial No Yes No vs Yes
Dimensions 1757x1134x30 mm 2384x1303x33 mm 1757x1134x30 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
BD54-WA470
15,892 kWh
ND66-GK725
24,325 kWh
Lifetime gap
8,433 kWh
Output when it is hot
Rated power carried across the range a module actually sees
Scenario BD54-WA470 ND66-GK725
Standard test conditions 25 °C 100.0% of rated power 470 W 725 W
Cool, bright day 40 °C 95.8% of rated power 452 W 695 W
Typical summer roof 55 °C 91.6% of rated power 433 W 664 W
Hot roof 70 °C 87.4% of rated power 415 W 634 W
03

Full specification

Parameter BD54-WA470 ND66-GK725 Difference
Power and efficiency
Rated power 470 Wp 725 Wp +255 W for ND66-GK725
Module efficiency 23.60 % 23.30 % +0.30 pp for BD54-WA470
Power density 235.9 Wp/m² 233.4 Wp/m² Effectively the same
Open-circuit voltage 41.18 V 49.36 V 8.18 V apart
Voltage at max power 34.74 V 41.27 V 6.53 V apart
Short-circuit current 14.32 A 18.60 A 4.28 A apart
Current at max power 13.54 A 17.57 A 4.03 A apart
Temperature
Temperature coefficient -0.260 %/°C -0.280 %/°C +0.020 %/°C for BD54-WA470
Mechanical
Dimensions 1757x1134x30 mm 2384x1303x33 mm 1757x1134x30 mm vs 2384x1303x33 mm
Module area 1.992 m² 3.106 m² 1.114 m² apart
Weight 21.5 kg 38.2 kg -16.7 kg for BD54-WA470
Weight per kWp 45.7 kg/kWp 52.7 kg/kWp -6.9 kg/kWp for BD54-WA470
Warranty and degradation
Product warranty 25 yrs 15 yrs +10 yrs for BD54-WA470
Performance warranty 30 yrs 30 yrs Same
Annual degradation 0.35 %/yr 0.40 %/yr -0.05 %/yr for BD54-WA470
Technology
Cell technology Back Contact N-type Back Contact vs N-type
Cell type Monocrystalline Monocrystalline Same
Cell count 108 132 24 cells apart
Bifacial No Yes No vs Yes
04

Against the whole database

14,005 panels
Efficiency
#627 vs #1,017
BD54-WA470 leads by 390 places
Power density
#657 vs #936
BD54-WA470 leads by 279 places
Heat behaviour
#511 vs #1,309
BD54-WA470 leads by 798 places
Weight
#860 vs #6,337
BD54-WA470 leads by 5,477 places
Warranty
#21 vs #21
Tied - the same position in the database
Overall
#4,119 vs #266
ND66-GK725 leads by 3,853 places
05

More useful comparisons

Open the full database
Same series, other bin
TCL Zhonghuan
TCL Zhonghuan HSM-BD54-WA470 vs TCL Zhonghuan HSM-BD54-WA475
One difference: module efficiency
Same series, other bin
TCL Zhonghuan
TCL Zhonghuan HSM-BD54-WA470 vs TCL Zhonghuan HSM-BD54-WA465
One difference: module efficiency
Same series, other bin
TCL Zhonghuan
TCL Zhonghuan HSM-BD54-WA470 vs TCL Zhonghuan HSM-BD54-WA460
3 differences, the largest is module efficiency
Same series, other bin
TCL Zhonghuan
TCL Zhonghuan HSM-ND66-GK725 vs TCL Zhonghuan HSM-ND66-GK720
The same specification on paper
Same series, other bin
TCL Zhonghuan
TCL Zhonghuan HSM-ND66-GK725 vs TCL Zhonghuan HSM-ND66-GK715
3 differences, the largest is module efficiency
Same series, other bin
TCL Zhonghuan
TCL Zhonghuan HSM-ND66-GK725 vs TCL Zhonghuan HSM-ND66-GK710
3 differences, the largest is module efficiency
06

Written summary

07

Questions about this pairing

Which panel is better: TCL Zhonghuan HSM-BD54-WA470 or TCL Zhonghuan HSM-ND66-GK725?
According to our database: TCL Zhonghuan HSM-BD54-WA470 has higher module efficiency (23.60% vs 23.30%); TCL Zhonghuan HSM-BD54-WA470 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-BD54-WA470 and TCL Zhonghuan HSM-ND66-GK725?
TCL Zhonghuan HSM-BD54-WA470 has a module efficiency of 23.60%, while TCL Zhonghuan HSM-ND66-GK725 is 23.30%. Higher efficiency means more electricity from the same roof area - useful when space is limited.
What cell technology does TCL Zhonghuan HSM-BD54-WA470 use vs TCL Zhonghuan HSM-ND66-GK725?
TCL Zhonghuan HSM-BD54-WA470 uses Back Contact cells; TCL Zhonghuan HSM-ND66-GK725 uses N-type. 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-BD54-WA470 and TCL Zhonghuan HSM-ND66-GK725?
TCL Zhonghuan HSM-BD54-WA470 has a 30 years power warranty; TCL Zhonghuan HSM-ND66-GK725 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-BD54-WA470 and TCL Zhonghuan HSM-ND66-GK725 bifacial panels?
TCL Zhonghuan HSM-ND66-GK725 is bifacial (captures light from both faces); TCL Zhonghuan HSM-BD54-WA470 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.