Frequently Asked Questions
- How the PV module is made?
Typical crystalline photovoltaic module is made of serial and parallel interconnected photovoltaic cells. A set of photovoltaic cells (matrix) is placed between the layers of PET and EVA foil and tempered glass from the top. The module is hermetically laminated and framed with a stiff and lightweight, usually aluminum frame. The frame provides mechanical strength of the modules and facilitate its mounting. The module design must ensure high protection to weather conditions throughout the lifetime (usually minimum 25 years).
- What are the different types of PV modules?
1. Monocyrstalline – made from photovoltaic cells created by cutting thin wafers from single silicon crystal ingot. Monocrystalline modules are typically marginally more efficient than polycrystalline and suffer a little less loss of power when the module becomes hot (typically losing 12-15% at 50°C as opposed to 14-23% for polycrystalline modules).
2. Polycrystalline (Multicrystalline) – made from cells created by cutting thin slices from multiple crystal silicon block. Polycrystalline modules remain typically slightly less efficient and historically been significantly cheaper than moncrystalline modules. Although advances in production single silicone crystal means that the costs are now largely similar for both.
3. Thin film – made by depositing a thin layer of very finely powdered silicon (amorphous silicon) or other photovoltaic material, on a substrate. These are much lower in efficiency that crystalline modules, and somewhat cheaper per watt. Their low efficiency makes them undesirable for commercial and residential applications because they consume a large amount of roof space compared to mono or poly modules.
- What is the difference between a solar (photovoltaic) module and a solar collector?
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About us
Although SELFA GE was not offering PV modules back then, renewable energy sources issues were always close to both – company’s management and employees. SELFA GE became a consultant for investors interested in photovoltaic systems. As more inquiries for PV systems and PV modules were yet to come, SELFA GE started cooperation with European PV modules producer. PV modules and systems expanded SELFA’s range od offered products and services.
