Solar Panels for Residential RooftopsA typical Roof Top solar panels PV system also contains a set of batteries and inverter along with the modules of Solar PV cells. The overall efficiency of the system will also depend on the type of battery and inverter used in the system. It is important to choose the right components for most effective use of Solar PV systems.Generally lead-acid are the best suited for a solar PV system. They last for 5 to 10 years and are 80% efficient (can reclaim 80% of energy stored in it). These batteries are also designed to provide electricity for long periods and can discharge up to 80% of their capacity repeatedly. Automotive batteries that are shallow cycle should not be used.
Electricity Units Generated from a Solar Panel PV Module systemAlthough we talked about wattage capacity of a solar PV system, but that does not mean that the wattage will be available 24 hours a day and all throughout the year. The units or kWH output of a solar panel will depend on the panel efficiency and availability of sunlight in a location. The factor that defines this output is called CUF (or Capacity Utility Factor). For India, it is typically taken as 19% and the calculation of units goes as: Units Generated Annually (in Kwh) = System Size in Kw * CUF * 365 * 24 So typically a 1kW capacity solar system will generate 1600-1700 kWH of electricity per year (please note that this is just a thumb rule as the CUF will vary in different cities in India). Please note that Mono is for Monocrystaline PV cell and Multi is for Multicrystaline (or Polycrystaline) PV cell. The difference between the two is that Monocrystaline is made of single silicon crystal whereas Multicrystaline PV is made up of multiple crystals. A monocrystaline is more efficient in converting solar energy into electricity per sq meter area than a multicrystaline PV. Thus the space required for the same amount of wattage is less in monocrystaline PV panel. Thus it is costlier than a Multicrystaline PV. The choice between the two depends on the area that you have for PV installation. Also the price increases as you decrease the panel wattage. So smaller the panel you buy, costlier it is. Solar Panels available from best companies like Su-Kam, deshmukh solar Panels from 10 Watt solar panels to 250 Watt solar panels:
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