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BD54-WA475 vs ND66-GK720 (IEC1500V) 2 of 18 identical Swap Change panels

TCL Zhonghuan HSM-BD54-WA475 vs TCL Zhonghuan HSM-ND66-GK720 (IEC1500V)

TCL Zhonghuan
HSM-BD54-WA475
475 Wp 23.80 % Back Contact
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

BD54-WA475 leads on the differences that matter

The largest is module efficiency: 0.80 pp more efficient. 2 of 18 comparable parameters are identical, with 1 more left out because at least one datasheet does not publish it.

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

What actually differs

16 of 18 parameters
Parameter BD54-WA475 ND66-GK720 (IEC1500V) Difference
Module efficiency 23.80 % 23.00 % 0.80 pp more efficient
Rated power 475 Wp 720 Wp 245 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 45.3 kg/kWp 53.1 kg/kWp 7.8 kg/kWp lighter
Temperature coefficient -0.260 %/°C -0.280 %/°C 0.020 %/°C better in heat
Power density 238.4 Wp/m² 231.8 Wp/m² 6.6 Wp/m² higher
Open-circuit voltage 41.24 V 49.14 V 7.90 V apart
Short-circuit current 14.35 A 18.56 A 4.21 A apart
Module area 1.992 m² 3.106 m² 1.114 m² apart
Cell technology Back Contact TOPCon Back Contact vs TOPCon
Voltage at max power 34.80 V 41.08 V 6.28 V apart
Current at max power 13.66 A 17.53 A 3.87 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
Declared first-year losses, with 0.40% a year afterwards assumed for both panels, at 1,200 kWh/kWp a year
BD54-WA475
15,937 kWh
ND66-GK720 (IEC1500V)
24,157 kWh
Lifetime gap
8,220 kWh
Output when it is hot
Rated power carried across the range a module actually sees
Scenario BD54-WA475 ND66-GK720 (IEC1500V)
Standard test conditions 25 °C 100.0% of rated power 475 W 720 W
Cool, bright day 40 °C 95.8% of rated power 456 W 690 W
Typical summer roof 55 °C 91.6% of rated power 438 W 660 W
Hot roof 70 °C 87.4% of rated power 419 W 629 W
03

Full specification

Parameter BD54-WA475 ND66-GK720 (IEC1500V) Difference
Power and efficiency
Rated power 475 Wp 720 Wp +245 W for ND66-GK720 (IEC1500V)
Module efficiency 23.80 % 23.00 % +0.80 pp for BD54-WA475
Power density 238.4 Wp/m² 231.8 Wp/m² +6.6 Wp/m² for BD54-WA475
Open-circuit voltage 41.24 V 49.14 V 7.90 V apart
Voltage at max power 34.80 V 41.08 V 6.28 V apart
Short-circuit current 14.35 A 18.56 A 4.21 A apart
Current at max power 13.66 A 17.53 A 3.87 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 53.1 kg/kWp -7.8 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 - Not published by TCL Zhonghuan
Technology
Cell technology Back Contact TOPCon Back Contact vs TOPCon
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 #1,919
BD54-WA475 leads by 1,486 places
Power density
#417 vs #1,347
BD54-WA475 leads by 930 places
Heat behaviour
#511 vs #1,309
BD54-WA475 leads by 798 places
Weight
#669 vs #6,810
BD54-WA475 leads by 6,141 places
Warranty
#21 vs #21
Tied - the same position in the database
Overall
#3,753 vs #391
ND66-GK720 (IEC1500V) leads by 3,362 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
TCL Zhonghuan
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-GK720 (IEC1500V) vs TCL Zhonghuan HSM-ND66-GK725 (IEC1500V)
One difference: module efficiency
Same series, other bin
TCL Zhonghuan
TCL Zhonghuan HSM-ND66-GK720 (IEC1500V) vs TCL Zhonghuan HSM-ND66-GK725
2 differences, the largest is module efficiency
Same series, other bin
TCL Zhonghuan
TCL Zhonghuan HSM-ND66-GK720 (IEC1500V) vs TCL Zhonghuan HSM-ND66-GK720
2 differences, the largest is cell technology
06

Written summary

07

Questions about this pairing

Which panel is better: TCL Zhonghuan HSM-BD54-WA475 or TCL Zhonghuan HSM-ND66-GK720 (IEC1500V)?
According to our database: TCL Zhonghuan HSM-BD54-WA475 has higher module efficiency (23.80% vs 23.00%); 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-GK720 (IEC1500V)?
TCL Zhonghuan HSM-BD54-WA475 has a module efficiency of 23.80%, 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-BD54-WA475 use vs TCL Zhonghuan HSM-ND66-GK720 (IEC1500V)?
TCL Zhonghuan HSM-BD54-WA475 uses Back Contact 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-BD54-WA475 and TCL Zhonghuan HSM-ND66-GK720 (IEC1500V)?
TCL Zhonghuan HSM-BD54-WA475 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-BD54-WA475 and TCL Zhonghuan HSM-ND66-GK720 (IEC1500V) bifacial panels?
TCL Zhonghuan HSM-ND66-GK720 (IEC1500V) 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.

Shop prices: See 25 TCL Zhonghuan offers

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.