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| All specification are subject to re-confirmation from our Principal Tata BP Solar. |
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FAQ |
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| Responses |
I have read again and again about PV modules and solar thermal collectors. What is the difference?
PV stands for photovoltaics, i.e. solar power. One usually speaks of modules only in this regard. The therm collector is used for thermal solar collectors for water heating.
What does kilowatt peak (kWp) or watt peak (Wp) mean?
The English term "peak" designates the rated power of the module under standard test conditions. This is stipulated with 1000 watt radiation power on a surface of one m², cell temperature of 25ºC and AM = 1.5x. The latter means that the sun radiation penetrates 1.5 times the atmosphere thickness (AM = Air Mass) of the earth on its path. All of these conditions are in reality rare; the real power therefore deviates from the rated values.
What does my roof need to be a solar power plant?
a) The free surface of your roof should be exposed to as little shadow as possible from features such as antennae, buildings, chimneys etc.
b) The sloping surface should ideally point in a southerly direction, but South-Easterly to South-Westerly is also good. An Easterly or Westerly direction is functional, but less substantial gains should be expected if this is the case. Flat roofs are also suitable for PV systems. A special mounting structure is used for such roofs.
How long does a solar power plant work?
We issue a 25 year power guarantee on our solar modules. The power inverters have a two-year factory warranty, which can be optionally extended to 10 years. Generally, the system has a lifespan of at least 25 years.
What should be done about any dirt on the modules?
The modules are self-cleans through rainfall when they are attached on a pitched roof or on a flat roof with a slope of at least 20°. However, leaves from nearby trees should always be removed as quickly as possible. This is because the shading of individual cells of a module can result in a considerable loss of earnings. Generally speaking, we recommend that the modules be checked every five years.
What level of maintenance does the solar power plant need?
Since no maintenance-intense component parts are included, generally speaking only very occasional maintenance is required. By means of the feed-in counter system or balancing with computer/data logger, you can regularly check the plausibility of the capitalized income values. Failures can be rapidly registered using this control.
Do hailstorms destroy the modules?
Not only is a special hardened glass used for the modules, they are also bombarded with ice spheres during our stringent testing procedures. These procedures are according to IEC standard, which are carried out with ice spheres from 12.5 mm to 35 mm diameter and the impact velocity has a peak value of 140 km/h. Hence, hailstorms tend to represent a very small danger for the modules.
What happens if lightening strikes?
A flash of lightning can destroy a solar power plant. The probability of a direct lightening strike is not increased through the system, although the solar energy plant could be destroyed by a flash of lightning nearby (overvoltage). An overload conductor is integrated into the power inverters to avoid this occurring.
Will a tracking system pay for itself?
You can receive up to 30% more earnings with a tracking system, because the system permanently follows the position of the sun. For roof-mounted systems, a tracking is not to be recommended. In the case of other plants, the financial benefit of the increased earnings is also to be set against the relatively high expenditure for the construction and static calculations of the tracking supply. |
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