MonocrystallineBifacialN-type
Tongwei Solar (TW Solar) undefined TWMND-78HD645W

Tongwei Solar (TW Solar) • tnc twmnd 78hd 625-645w

TWMND-78HD645W645W

BifacialN-type
Region:China
Region shows where the seller or factory is located. Most ship globally, and all listed suppliers should be able to ship to your current location.
645W
Power Output
23.1%
Efficiency
2465 x 1134
Dimensions (mm)
12 Yrs
Product Warranty
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Key Features

  • 12-year product warranty
  • 30-year linear power output warranty

Tongwei Solar (TW Solar) TWMND-78HD645W Panels: What Your System Looks Like

Based on a standard 10kW residential installation

10kW System Size
16 Panels
Estimated Roof Area
484 sq.ft. (45 m²)
Avg. Yearly Production
11,500 kWh
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Electrical Data (STC)

Maximum Power (Pmax)645 W
Module Efficiency23.1 %
Voltage at Pmax (Vmp)48.36 V
Current at Pmax (Imp)13.34 A
Open Circuit Voltage (Voc)57.6 V
Short Circuit Current (Isc)14.05 A

Mechanical Data

Dimensions2465 x 1134 x 30 mm
Weight33.8 kg
Cell TypeMonocrystalline
Number of Cells156
Front Glass2 mm
FrameAnodized Aluminium

Temperature Ratings

Temperature Coefficient of Pmax-0.28 %/°C
Temperature Coefficient of Voc-0.28 %/°C
Temperature Coefficient of Isc0.05 %/°C
Operating Temperature Range-40 - 85 °C

Similar Products

1134 x 2465 mm
Roof Fit Tool

Will These Panels Fit Your Roof?

Don’t guess your solar potential. Our Roof Layout Designer uses the exact dimensions of the Tongwei Solar (TW Solar) TWMND-78HD645W (645W modules) to map out your system. Visually plan your array to see exactly how many modules your roof can support based on its specific footprint.

Precision Layout Preview: See exactly how the 645W modules sit on your roof.
Accurate Technical Spacing: Factors in real-world gaps and mounting rails.
Instant System Sizing: Automatically calculates total kW output for this specific panel.
Optimization Tips: Suggestions to maximize your roof’s energy density.
Map This Panel on My Roof

Ideal Use Case

The Tongwei Solar (TW Solar) TWMND-78HD645W is designed for specific solar energy applications. This panel is an excellent choice if you:

Need premium 645W panels for maximum power density
Maximize energy output in limited space (23.1% efficiency)
Can benefit from ground-reflected light (bifacial design)
Install on commercial buildings with ample roof space
Install in hot climates (low temperature coefficient)
Install commercial or utility-scale systems

Don’t guess your solar setup — calculate it first!

Take our Solar Quiz to get a personalized recommendation for panels, inverter, battery capacity, and system size — before you spend money on the wrong setup.

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Product FAQ

How many Tongwei Solar (TW Solar) TWMND-78HD645W panels do I need for my home?

The number of panels depends on your energy consumption and roof area. At 645W per panel, a typical 10kW residential system requires about 16 modules. Use our Solar Roof Calculator to get a precise layout based on your actual roof dimensions.

What is the efficiency of Tongwei Solar (TW Solar) TWMND-78HD645W?

This panel has an efficiency of 23.1%, using Bifacial, N-type cell technology. Higher efficiency means more electricity per square meter, which is especially valuable when roof space is limited.

Can I get more power from the bifacial Tongwei Solar (TW Solar) TWMND-78HD645W?

Yes. Since this is a Bifacial module, it can capture sunlight from both sides. Depending on the reflectivity (albedo) of your roof surface, you can see a gain of 5% to 25% in total energy yield.

What are the dimensions of the Tongwei Solar (TW Solar) TWMND-78HD645W?

The module dimensions are 2465mm × 1134mm × 30mm. Always account for these measurements plus fire setbacks and mounting clearances when planning your solar layout.

Is Tongwei Solar (TW Solar) TWMND-78HD645W compatible with standard inverters?

Yes, these panels work with most string and hybrid inverters. However, you must check the Voc (Open Circuit Voltage) and Imp (Current at Max Power) against your inverter's MPPT specs.

What warranty does the Tongwei Solar (TW Solar) TWMND-78HD645W come with?

This panel includes a 12-year product warranty from Tongwei Solar (TW Solar). Solar panels typically degrade about 0.4–0.5% per year, meaning this module should retain over 87% of its original output after 30 years.