Showing posts with label Wattage requirement. Show all posts
Showing posts with label Wattage requirement. Show all posts

Friday 23 May 2014

How to install solar panel at roof top and stay off the grid life chapter-2

How to select the type, Quality and quantity of Solar Panel for living a Grid free life. What are the total daily Wattage requirement for average household.


By: Alok kumar

How to select the best solar panel for home to enjoy grid free life, is the most popular question asked by the guys all around the world. To understand how to choose the solar panel array one should be familiar with certain electrical terminology which are ( if you simply know this basic thongs skip this paragraph):


  • Voltage
  • Amperage
  • wattage 

Voltage: The potential difference between two points. Is measured in Volts (V) and has the symbol                   ‘V’.

Current: The flow of electrons in a circuit. Is measured in Amps (A)and has the symbol ‘I’.

Resistance: A material’s opposition to an electrical current. Is measured in Ohms (Ω) and has the                          symbol ‘R’.

Power: The rate of doing work. Is measured in Watts and has thesymbol ‘P’.

Energy: The capacity for work, the product of power and time. Has the symbol ‘E’. The basic unit of              energy is the Joule, but electrical energy is normally expressed in Watt hours (Wh) or kilo                    Watt hours (kWh). One kWh is 1000 Wh.

The relationship between these units is:

                  P = VI
                  or V = P/I or I = P/V

                  V = IR
                  or I = V/R or V = I/R

                 P = I2R



Power equals voltage multiplied by current. This can also be expressed in the other two forms shown.

Voltage equals current multiplied by resistance. Again there are two other forms shown. This is known as ‘Ohm’s law’.

Power equals current squared multiplied by resistance.

Now we are prepared to start the above discussion that How to choose the optimum solar panel for home.

How to choose an optimum solar panel for homes.


We have to consider different points when choosing optimum solar panel array. These points are:
  • How much wattage we need daily.
  • Space we have and space required by solar panel for such daily power requirement.
  • How to calculate the actual daily power needed.