Tongwei Solar (TW Solar) • tnc twmnd 78hd 625-645w
Based on a standard 10kW residential installation
Don’t guess your solar potential. Our Roof Layout Designer uses the exact dimensions of the Tongwei Solar (TW Solar) TWMND-78HD640W (640W 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.
The Tongwei Solar (TW Solar) TWMND-78HD640W is designed for specific solar energy applications. This panel is an excellent choice if you:
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The number of panels depends on your energy consumption and roof area. At 640W 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.
This panel has an efficiency of 22.9%, using Bifacial, N-type cell technology. Higher efficiency means more electricity per square meter, which is especially valuable when roof space is limited.
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.
The module dimensions are 2465mm × 1134mm × 30mm. Always account for these measurements plus fire setbacks and mounting clearances when planning your solar layout.
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.
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.