Solar water heaters are environment-friendly and utilize the energy from sunlight to heat water as they capture the heat energy coming from the Sun’s rays and transfer it to the water that needs to be heated and the resultant hot water is stored in an insulated tank for future use. Depending upon the materials used and the efficiency of specific models, water is heated up to 50-60 deg C.
Solar heaters are a reliable solution to meet our daily hot water requirements throughout the year. Companies have been selling Solar heaters in India for over two decades now and these products are increasingly becoming a preferred alternative to electric water heaters. There are basically two types of solar water heaters namely Flat Plate Collector (FPC) and Evacuated Tube Collector (ETC). In case of hard water applications, there are models available where the inner surface of the hot water storage tank is coated with special chemicals to withstand the corrosion due to hardness and in case of pressurized fittings like jet shower in your bathroom, there are specific models that can withstand the water pressure.
These products have a payback of between 2 to 3 years and a 100 ltrs per day capacity model that can meet the hot water requirements for a household of up to 4 members typically saves 1500 units of electricity per year and leads to a carbon footprint offset of around 1.5 tonnes per year.
During overcast days too, this system will work as it makes use of the diffused radiation in the atmosphere. It can also be integrated with an existing electric system that can act as a backup during the days when the overcast is long. With respect to maintenance of this product, the collectors may need frequent cleaning using acid and the frequency is decided by the hardness content in the water. Paint on the outside surface of the product may peel off and may need repainting once in every 2-3 years to prevent corrosion. Occasional leakages might happen in the system and local plumbers can repair it.
Solar inverters work on the principle of converting heat energy into electrical energy. The process begins with solar photovoltaic cells (PV) that capture the sun’s rays and converting them into raw electricity called direct current (DC). These inverters then modify this DC into alternating current (AC). This alternating current is used to power homes, electronic devices and other appliances like TV, Washing Machine, Refrigerator, Microwave, lights and bulbs that require electricity. Solar inverters are used in houses, hospitals, hotels, offices, commercial establishments and industries. Solar inverters play the role of an important source of alternate electricity at the time of power outages from government grids.
The various types of solar inverters are Stand-alone, Grid Tied and Hybrid Solar Inverters. Stand-alones are used in systems without a connection to the power grid and will have attached batteries. These are mainly used in off grid applications and in residential / commercial segments where there is no net metering available.
Grid Tied type are designed to a utility grid and will not operate when they do not detect the presence of a grid. They contain special circuitry to precisely match the voltage and frequency of the grid. Grid-tied solar inverters are designed to shut down automatically upon loss of utility supply, for safety reasons. They do not provide backup power during power outages and are always used in solar power plants connected to the grid. The hybrid models use solar power as long as it is available and automatically switches to the grid mode in the absence of solar energy.
Demoport lists a wide range of proven solar water heaters from popular brands in India like Honeywell, Havells, Su-kam, Racold, Anu Solar, Venus, Cascade and Solarizer that you can buy online. In Solar Inverters, products from brands like Su-kam, Borg, Microtek and Luminous can be bought online at Demoport.
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