I want to install a solar system to support heating and hot water preparation. I have contacted several companies and obtained various quotes, but I basically have no idea what to look for when buying solar panels. Simply put: How can I distinguish good panels from bad ones? It would be great if someone here could provide a few pointers.
[h=3]Hello KuK,
you have the option to choose between crystalline cells and thin-film cells...
Power crystals provide high output[/h] The thicker the glass in crystalline solar cells, the more durable the cells are. A larger edge clearance protects the cells. Additionally, the edges of the modules tend to accumulate dirt more easily – which is another reason why a larger edge clearance is beneficial. When selecting modules with junction boxes, make sure these are as small as possible, since the cells near the attachment point warm up, which can reduce the solar panel’s performance.
[h=3]Thin-film modules ideal for large areas[/h] Thin-film cells absorb light more effectively. They perform better under diffuse light conditions, and shading has less impact compared to crystalline cells. They are cheaper to manufacture and therefore less expensive. The layer can also be deposited onto flexible substrates. Their production uses fewer raw materials and less energy – the energy payback time is about two to three years. Downsides include lower efficiency, limited long-term experience, and partially unresolved recycling issues.
Good quality is recognized by...
- Module has certification marking (CE) --> IEC 61215 for crystalline modules; EC 61646 for amorphous modules
- Power tolerance (usually specified by manufacturers as about ± 3 to 5 percent) --> a rating of +5 to 0 percent is advantageous (but rather rare)
you have the option to choose between crystalline cells and thin-film cells...
Power crystals provide high output[/h] The thicker the glass in crystalline solar cells, the more durable the cells are. A larger edge clearance protects the cells. Additionally, the edges of the modules tend to accumulate dirt more easily – which is another reason why a larger edge clearance is beneficial. When selecting modules with junction boxes, make sure these are as small as possible, since the cells near the attachment point warm up, which can reduce the solar panel’s performance.
[h=3]Thin-film modules ideal for large areas[/h] Thin-film cells absorb light more effectively. They perform better under diffuse light conditions, and shading has less impact compared to crystalline cells. They are cheaper to manufacture and therefore less expensive. The layer can also be deposited onto flexible substrates. Their production uses fewer raw materials and less energy – the energy payback time is about two to three years. Downsides include lower efficiency, limited long-term experience, and partially unresolved recycling issues.
Good quality is recognized by...
- Module has certification marking (CE) --> IEC 61215 for crystalline modules; EC 61646 for amorphous modules
- Power tolerance (usually specified by manufacturers as about ± 3 to 5 percent) --> a rating of +5 to 0 percent is advantageous (but rather rare)
M
MODERATOR10 Sep 2012 22:44Maryam has provided good advice, but it relates to the assessment of photovoltaic systems, which generate electrical energy from solar power. For heating support, solar thermal collectors are required, as they produce thermal energy.
There are two types of solar thermal collectors: flat-plate collectors and evacuated tube collectors. Flat-plate collectors are more cost-effective but have a lower heat output. As a rough estimate, plan for about 1.5m² (16 ft²) of collector area per person for domestic hot water production. Evacuated tube collectors have a higher efficiency, so less collector area is needed, approximately 1.0m² (11 ft²) per person for hot water production.
The so-called solar storage tank has a significant impact on the overall system performance, as it keeps the hot water warm until it is used.
An analysis of the heat demand, available surface area, and usable solar radiation should precede any decisions. This means you should consult an energy advisor. They are knowledgeable about the collectors and storage tanks commonly available on the market and can recommend the best system for your specific needs.
There are two types of solar thermal collectors: flat-plate collectors and evacuated tube collectors. Flat-plate collectors are more cost-effective but have a lower heat output. As a rough estimate, plan for about 1.5m² (16 ft²) of collector area per person for domestic hot water production. Evacuated tube collectors have a higher efficiency, so less collector area is needed, approximately 1.0m² (11 ft²) per person for hot water production.
The so-called solar storage tank has a significant impact on the overall system performance, as it keeps the hot water warm until it is used.
An analysis of the heat demand, available surface area, and usable solar radiation should precede any decisions. This means you should consult an energy advisor. They are knowledgeable about the collectors and storage tanks commonly available on the market and can recommend the best system for your specific needs.
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