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BD60-LA505 vs ND66-GK725 (IEC1500V) 2 of 18 identical Swap Change panels

TCL Zhonghuan HSM-BD60-LA505 vs TCL Zhonghuan HSM-ND66-GK725 (IEC1500V)

TCL Zhonghuan
HSM-BD60-LA505
505 Wp 22.80 % Back Contact
Open panel page Datasheet PDF
VS
TCL Zhonghuan
HSM-ND66-GK725 (IEC1500V)
725 Wp 23.30 % TOPCon Bifacial Incomplete
Open panel page Datasheet PDF
The verdict

16 differences, and they point both ways

The largest is rated power: 220 W more power. 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 BD60-LA505 ND66-GK725 (IEC1500V) Difference
Rated power 505 Wp 725 Wp 220 W more power
Module efficiency 22.80 % 23.30 % 0.50 pp more efficient
Weight 23.5 kg 38.2 kg 14.7 kg lighter
Product warranty 25 yrs 15 yrs 10 yrs longer
Temperature coefficient -0.260 %/°C -0.280 %/°C 0.020 %/°C better in heat
Weight per kWp 46.5 kg/kWp 52.7 kg/kWp 6.2 kg/kWp lighter
Open-circuit voltage 45.12 V 49.36 V 4.24 V apart
Short-circuit current 14.11 A 18.60 A 4.49 A apart
Module area 2.216 m² 3.106 m² 0.891 m² apart
Power density 227.9 Wp/m² 233.4 Wp/m² 5.5 Wp/m² higher
Cell technology Back Contact TOPCon Back Contact vs TOPCon
Current at max power 13.30 A 17.57 A 4.27 A apart
Cell count 120 132 12 cells apart
Voltage at max power 38.00 V 41.27 V 3.27 V apart
Bifacial No Yes No vs Yes
Dimensions 1954x1134x30 mm 2384x1303x33 mm 1954x1134x30 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
BD60-LA505
16,944 kWh
ND66-GK725 (IEC1500V)
24,325 kWh
Lifetime gap
7,381 kWh
Output when it is hot
Rated power carried across the range a module actually sees
Scenario BD60-LA505 ND66-GK725 (IEC1500V)
Standard test conditions 25 °C 100.0% of rated power 505 W 725 W
Cool, bright day 40 °C 95.8% of rated power 485 W 695 W
Typical summer roof 55 °C 91.6% of rated power 466 W 664 W
Hot roof 70 °C 87.4% of rated power 446 W 634 W
03

Full specification

Parameter BD60-LA505 ND66-GK725 (IEC1500V) Difference
Power and efficiency
Rated power 505 Wp 725 Wp +220 W for ND66-GK725 (IEC1500V)
Module efficiency 22.80 % 23.30 % +0.50 pp for ND66-GK725 (IEC1500V)
Power density 227.9 Wp/m² 233.4 Wp/m² +5.5 Wp/m² for ND66-GK725 (IEC1500V)
Open-circuit voltage 45.12 V 49.36 V 4.24 V apart
Voltage at max power 38.00 V 41.27 V 3.27 V apart
Short-circuit current 14.11 A 18.60 A 4.49 A apart
Current at max power 13.30 A 17.57 A 4.27 A apart
Temperature
Temperature coefficient -0.260 %/°C -0.280 %/°C +0.020 %/°C for BD60-LA505
Mechanical
Dimensions 1954x1134x30 mm 2384x1303x33 mm 1954x1134x30 mm vs 2384x1303x33 mm
Module area 2.216 m² 3.106 m² 0.891 m² apart
Weight 23.5 kg 38.2 kg -14.7 kg for BD60-LA505
Weight per kWp 46.5 kg/kWp 52.7 kg/kWp -6.2 kg/kWp for BD60-LA505
Warranty and degradation
Product warranty 25 yrs 15 yrs +10 yrs for BD60-LA505
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 120 132 12 cells apart
Bifacial No Yes No vs Yes
04

Against the whole database

14,005 panels
Efficiency
#2,714 vs #1,017
ND66-GK725 (IEC1500V) leads by 1,697 places
Power density
#2,788 vs #936
ND66-GK725 (IEC1500V) leads by 1,852 places
Heat behaviour
#511 vs #1,309
BD60-LA505 leads by 798 places
Weight
#1,199 vs #6,337
BD60-LA505 leads by 5,138 places
Warranty
#21 vs #21
Tied - the same position in the database
Overall
#3,916 vs #266
ND66-GK725 (IEC1500V) leads by 3,650 places
05

More useful comparisons

Open the full database
Same series, other bin
TCL Zhonghuan
TCL Zhonghuan HSM-BD60-LA505 vs TCL Zhonghuan HSM-BD60-LA520
3 differences, the largest is module efficiency
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TCL Zhonghuan HSM-BD60-LA505 vs TCL Zhonghuan HSM-BD60-LA515
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TCL Zhonghuan HSM-BD60-LA505 vs TCL Zhonghuan HSM-BD60-LA510
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TCL Zhonghuan HSM-BD60-LA505 vs TCL Zhonghuan HSM-BD60-LA500
One difference: module efficiency
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
06

Written summary

07

Questions about this pairing

Which panel is better: TCL Zhonghuan HSM-BD60-LA505 or TCL Zhonghuan HSM-ND66-GK725 (IEC1500V)?
According to our database: TCL Zhonghuan HSM-ND66-GK725 (IEC1500V) has higher module efficiency (23.30% vs 22.80%); TCL Zhonghuan HSM-BD60-LA505 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-BD60-LA505 and TCL Zhonghuan HSM-ND66-GK725 (IEC1500V)?
TCL Zhonghuan HSM-BD60-LA505 has a module efficiency of 22.80%, while TCL Zhonghuan HSM-ND66-GK725 (IEC1500V) 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-BD60-LA505 use vs TCL Zhonghuan HSM-ND66-GK725 (IEC1500V)?
TCL Zhonghuan HSM-BD60-LA505 uses Back Contact cells; TCL Zhonghuan HSM-ND66-GK725 (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-BD60-LA505 and TCL Zhonghuan HSM-ND66-GK725 (IEC1500V)?
TCL Zhonghuan HSM-BD60-LA505 has a 30 years power warranty; TCL Zhonghuan HSM-ND66-GK725 (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-BD60-LA505 and TCL Zhonghuan HSM-ND66-GK725 (IEC1500V) bifacial panels?
TCL Zhonghuan HSM-ND66-GK725 (IEC1500V) is bifacial (captures light from both faces); TCL Zhonghuan HSM-BD60-LA505 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.