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

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

TCL Zhonghuan
HSM-ND66-GK725
725 Wp 23.30 % N-type Bifacial
Open panel page Datasheet PDF
VS
TCL Zhonghuan
HSM-BD54-WA475
475 Wp 23.80 % Back Contact
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 ND66-GK725 BD54-WA475 Difference
Rated power 725 Wp 475 Wp 250 W more power
Module efficiency 23.30 % 23.80 % 0.50 pp more efficient
Weight 38.2 kg 21.5 kg 16.7 kg lighter
Product warranty 15 yrs 25 yrs 10 yrs longer
Weight per kWp 52.7 kg/kWp 45.3 kg/kWp 7.4 kg/kWp lighter
Temperature coefficient -0.280 %/°C -0.260 %/°C 0.020 %/°C better in heat
Open-circuit voltage 49.36 V 41.24 V 8.12 V apart
Short-circuit current 18.60 A 14.35 A 4.25 A apart
Module area 3.106 m² 1.992 m² 1.114 m² apart
Power density 233.4 Wp/m² 238.4 Wp/m² 5.0 Wp/m² higher
Cell technology N-type Back Contact N-type vs Back Contact
Annual degradation 0.40 %/yr 0.35 %/yr 0.05 %/yr slower
Voltage at max power 41.27 V 34.80 V 6.47 V apart
Current at max power 17.57 A 13.66 A 3.91 A apart
Cell count 132 108 24 cells apart
Bifacial Yes No Yes vs No
Dimensions 2384x1303x33 mm 1757x1134x30 mm 2384x1303x33 mm vs 1757x1134x30 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
BD54-WA475
16,061 kWh
Lifetime gap
8,264 kWh
Output when it is hot
Rated power carried across the range a module actually sees
Scenario ND66-GK725 BD54-WA475
Standard test conditions 25 °C 100.0% of rated power 725 W 475 W
Cool, bright day 40 °C 95.8% of rated power 695 W 456 W
Typical summer roof 55 °C 91.6% of rated power 664 W 438 W
Hot roof 70 °C 87.4% of rated power 634 W 419 W
03

Full specification

Parameter ND66-GK725 BD54-WA475 Difference
Power and efficiency
Rated power 725 Wp 475 Wp +250 W for ND66-GK725
Module efficiency 23.30 % 23.80 % +0.50 pp for BD54-WA475
Power density 233.4 Wp/m² 238.4 Wp/m² +5.0 Wp/m² for BD54-WA475
Open-circuit voltage 49.36 V 41.24 V 8.12 V apart
Voltage at max power 41.27 V 34.80 V 6.47 V apart
Short-circuit current 18.60 A 14.35 A 4.25 A apart
Current at max power 17.57 A 13.66 A 3.91 A apart
Temperature
Temperature coefficient -0.280 %/°C -0.260 %/°C +0.020 %/°C for BD54-WA475
Mechanical
Dimensions 2384x1303x33 mm 1757x1134x30 mm 2384x1303x33 mm vs 1757x1134x30 mm
Module area 3.106 m² 1.992 m² 1.114 m² apart
Weight 38.2 kg 21.5 kg -16.7 kg for BD54-WA475
Weight per kWp 52.7 kg/kWp 45.3 kg/kWp -7.4 kg/kWp for BD54-WA475
Warranty and degradation
Product warranty 15 yrs 25 yrs +10 yrs for BD54-WA475
Performance warranty 30 yrs 30 yrs Same
Annual degradation 0.40 %/yr 0.35 %/yr -0.05 %/yr for BD54-WA475
Technology
Cell technology N-type Back Contact N-type vs Back Contact
Cell type Monocrystalline Monocrystalline Same
Cell count 132 108 24 cells apart
Bifacial Yes No Yes vs No
04

Against the whole database

14,005 panels
Efficiency
#1,017 vs #433
BD54-WA475 leads by 584 places
Power density
#936 vs #417
BD54-WA475 leads by 519 places
Heat behaviour
#1,309 vs #511
BD54-WA475 leads by 798 places
Weight
#6,337 vs #669
BD54-WA475 leads by 5,668 places
Warranty
#21 vs #21
Tied - the same position in the database
Overall
#266 vs #3,753
ND66-GK725 leads by 3,487 places
05

More useful comparisons

Open the full database
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The same specification on paper
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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-BD54-WA475 vs TCL Zhonghuan HSM-BD54-WA470
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-BD54-WA475?
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-ND66-GK725 and TCL Zhonghuan HSM-BD54-WA475?
TCL Zhonghuan HSM-ND66-GK725 has a module efficiency of 23.30%, while TCL Zhonghuan HSM-BD54-WA475 is 23.80%. 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-BD54-WA475?
TCL Zhonghuan HSM-ND66-GK725 uses N-type cells; TCL Zhonghuan HSM-BD54-WA475 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 and TCL Zhonghuan HSM-BD54-WA475?
TCL Zhonghuan HSM-ND66-GK725 has a 30 years power warranty; TCL Zhonghuan HSM-BD54-WA475 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-BD54-WA475 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.