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Solar System Savings and Load Guide

How to calculate your optimum solar system load before installation for roof top system? 

grid-tied-solar-systemSolar system can be implemented in two ways – either on grid or off grid system. Off grid roof top system is best suited for locations with inconsistent power supply. On grid system is most suitable for areas where there is continuous power supply and power generated during sunlight can be used and extra energy can be sent back to grid. 

List of components needed for 

Off grid system – solar panels , batteries , charge controllers , wires , connectors and inverter 

On grid system – solar panels ,wires , connectors and inverter 

Advantages 

Off grid system – no need of power supply from grid , ability to work in anywhere 

On grid system – lowers electricity bills , cheaper than off grid  

off-grid-solar-systemDisadvantages 

Off grid system – expensive , need to change batteries , need more space , doesn’t work during prolonged period of darkness such as rainy and foggy season. 

On grid system – dependency on grid – doesn’t work when there is no electricity. 

Off grid system is 50% more expensive due to additional battery cost. Over longer period of time ( 25 years) , cost is as much 150% more than on grid system. 

solar-cost-calculator1On grid system calculation 

Let’s say your load is 10 kw 

Based on your location , you can install maximum 80 to 100% of your demand load. 

Space needed for 1 kw – 110 square feet

Units generated per hour of sunshine – 1

Units generated per day per kw – 5 ( assuming yearly average – 1000 irradiance sunlight ) 

So 10 kw will need 

1100 square feet of shade free area

Units generated per year – 320*5*10 = 16000 units 

Let’s suppose price per units is Rs 7 

So total saving per year – 16000*7 = Rs 1,12,000 

Initial Investment – 10 kw * 75000 = 7,50,000 

Pay back period – 6.7 years 

Life of solar system – 25 years minimum , add 25% more after 25 years and you are again good to go. 

Going solar is all about benefits. Solar pv modules prices are going lower. Solar energy is a sustainable way. it helps your pocket and environment. Best way to give your contribution to Mother Earth.