Frequently asked questions

 

What is a "Solar heating device"?

 
 
Solar heating devices: make use of the heat energy available in the sunlight, for heating mediums like water, air etc.     
 
 

What is a solar water heater?

 
 

A solar water heating system is an integration of a collector, an insulated storage tank and inter connecting pipelines. The collector of SWH collects the sunlight with its black absorber. The solar radiation falls on the absorber heats the water flowing through the tubes connected to the absorber. The heated water is collected and stored in the storage tank. The storage tank is well insulated that the water remains hot and can be used later the same day or even the following. The built in electrical backup for the solar water heater shall provide hot water during less or non sunny days, ensures hot water for all 365 days and one can totally eliminate the usage of regular electrical water heaters.    

 
  Why should one go for solar water heating?  
 

Because:-

  • Solar water heaters save electricity and thus money
  • Electricity is becoming more and more expensive
  • They could even turnout to be more reliable than electric power supply
  • Eco friendly and reflect one's commitment for environment
  • Safer than electric geysers
  • If well designed, even look good on the housetop.
 
  Expected life of a solar water heater?  
 

Typical Flat plate solar water heaters made using materials as per BIS specifications could last for 15 -20 years depending upon the general upkeep. Enter into AMC for periodical system maintenance.

 
 

What is the maintenance required for SWH systems?

 
 

Solar Water Heaters once installed requires very little maintenance. Maintenance involves wiping the dust deposited on the glass surface periodically to maintain the efficiency of the system. It is also required to flush the tank. If outside exposed surfaces are painted, the paint may have to be redone every 2-3 years to prevent corrosion of the surfaces.

The main cold water tank must be always filled up to the level to ensure continuous supply of cold water to the solar tank. Use of an Automatic Level Controller can help in maintaining an optimum level of water.  
 
  What are the minimum requirements for installing a Solar Water Heater?  
 
  • A shadow free area on the rooftop with enough of Sunlight..
  • The location must be ideal for facing the collector towards south.
  • A cold-water tank at a height of 6- 7 ft (10ft in case of non-domestic) from the terrace level where the system is installed.
  • Pressurized solar water heating system installation do not require water overhead.
 
  What are the requirements for installing an SPV system?  
 
  • A shadow free area ideally on the rooftop with enough of Sunlight.
  • The location must be ideal for facing the SPV modules towards south.
  • A moisture free area for keeping battery.
 
  What is the maintenance required for SPV systems?  
 

SPV systems once installed require very little maintenance. Maintenance involves wiping the dust deposited on the glass surface periodically to maintain the efficiency of the system. It is also required to top up the battery (in case of tubular batteries).