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BD54-WA475 vs ND66-GK725 2 of 19 identical Swap Change panels

TCL Zhonghuan HSM-BD54-WA475 vs TCL Zhonghuan HSM-ND66-GK725

TCL Zhonghuan
HSM-BD54-WA475
475 Wp 23.80 % 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-WA475 leads on the differences that matter

The largest is rated power: 250 W more power. 2 of 19 comparable parameters are identical.

See all 17 differences
How alike are they
2 of 19 comparable
parameters are identical
identical differs
01

What actually differs

17 of 19 parameters
Parameter BD54-WA475 ND66-GK725 Difference
Rated power 475 Wp 725 Wp 250 W more power
Module efficiency 23.80 % 23.30 % 0.50 pp more efficient
Weight 21.5 kg 38.2 kg 16.7 kg lighter
Product warranty 25 yrs 15 yrs 10 yrs longer
Weight per kWp 45.3 kg/kWp 52.7 kg/kWp 7.4 kg/kWp lighter
Temperature coefficient -0.260 %/°C -0.280 %/°C 0.020 %/°C better in heat
Open-circuit voltage 41.24 V 49.36 V 8.12 V apart
Short-circuit current 14.35 A 18.60 A 4.25 A apart
Module area 1.992 m² 3.106 m² 1.114 m² apart
Power density 238.4 Wp/m² 233.4 Wp/m² 5.0 Wp/m² higher
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 34.80 V 41.27 V 6.47 V apart
Current at max power 13.66 A 17.57 A 3.91 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-WA475
16,061 kWh
ND66-GK725
24,325 kWh
Lifetime gap
8,264 kWh
Output when it is hot
Rated power carried across the range a module actually sees
Scenario BD54-WA475 ND66-GK725
Standard test conditions 25 °C 100.0% of rated power 475 W 725 W
Cool, bright day 40 °C 95.8% of rated power 456 W 695 W
Typical summer roof 55 °C 91.6% of rated power 438 W 664 W
Hot roof 70 °C 87.4% of rated power 419 W 634 W
03

Full specification

Parameter BD54-WA475 ND66-GK725 Difference
Power and efficiency
Rated power 475 Wp 725 Wp +250 W for ND66-GK725
Module efficiency 23.80 % 23.30 % +0.50 pp for BD54-WA475
Power density 238.4 Wp/m² 233.4 Wp/m² +5.0 Wp/m² for BD54-WA475
Open-circuit voltage 41.24 V 49.36 V 8.12 V apart
Voltage at max power 34.80 V 41.27 V 6.47 V apart
Short-circuit current 14.35 A 18.60 A 4.25 A apart
Current at max power 13.66 A 17.57 A 3.91 A apart
Temperature
Temperature coefficient -0.260 %/°C -0.280 %/°C +0.020 %/°C for BD54-WA475
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-WA475
Weight per kWp 45.3 kg/kWp 52.7 kg/kWp -7.4 kg/kWp for BD54-WA475
Warranty and degradation
Product warranty 25 yrs 15 yrs +10 yrs for BD54-WA475
Performance warranty 30 yrs 30 yrs Same
Annual degradation 0.35 %/yr 0.40 %/yr -0.05 %/yr for BD54-WA475
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
#433 vs #1,017
BD54-WA475 leads by 584 places
Power density
#417 vs #936
BD54-WA475 leads by 519 places
Heat behaviour
#511 vs #1,309
BD54-WA475 leads by 798 places
Weight
#669 vs #6,337
BD54-WA475 leads by 5,668 places
Warranty
#21 vs #21
Tied - the same position in the database
Overall
#3,753 vs #266
ND66-GK725 leads by 3,487 places
05

More useful comparisons

Open the full database
Same series, other bin
TCL Zhonghuan
TCL Zhonghuan HSM-BD54-WA475 vs TCL Zhonghuan HSM-BD54-WA470
One difference: module efficiency
Same series, other bin
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TCL Zhonghuan HSM-BD54-WA475 vs TCL Zhonghuan HSM-BD54-WA465
3 differences, the largest is module efficiency
Same series, other bin
TCL Zhonghuan
TCL Zhonghuan HSM-BD54-WA475 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-WA475 or TCL Zhonghuan HSM-ND66-GK725?
According to our database: TCL Zhonghuan HSM-BD54-WA475 has higher module efficiency (23.80% vs 23.30%); TCL Zhonghuan HSM-BD54-WA475 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-WA475 and TCL Zhonghuan HSM-ND66-GK725?
TCL Zhonghuan HSM-BD54-WA475 has a module efficiency of 23.80%, 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-WA475 use vs TCL Zhonghuan HSM-ND66-GK725?
TCL Zhonghuan HSM-BD54-WA475 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-WA475 and TCL Zhonghuan HSM-ND66-GK725?
TCL Zhonghuan HSM-BD54-WA475 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-WA475 and TCL Zhonghuan HSM-ND66-GK725 bifacial panels?
TCL Zhonghuan HSM-ND66-GK725 is bifacial (captures light from both faces); TCL Zhonghuan HSM-BD54-WA475 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.