Off Grid Solar System - Solar System for Home

As the demand and prices of electricity have kept on rising, the world looks at renewable energy sources for its power needs. In recent years, solar energy has become a popular renewable energy source because of its falling costs and improving efficiencies.

solar system is a setup that generates electricity by utilizing the solar energy system. A typical solar system consists of solar panels (which absorb sunlight), inverter (which converts DC into AC), mounting structure (that hold the panels in place), batteries (to store the extra power generated), grid box and balance of systems (wires, nuts etc.). A solar system comes in various sizes like 1 kWh, 2 kWh 3kW, 5kW, 7.5 kW, and 10kW.

A solar system which has battery storage and a backup is called an off grid solar system that generates electricity after power cut or during the night hours.  It has the four major components, such as solar panelsinverterbattery and balancing of system. This solar system is more popular and comes with a power backup and it works independently of the grid.

They are solar pv system which are not connected to the national grid.

  • Completely independent from the grid

  • Also called Stand-Alone PV systems

Energy can be Consumed at same time of production or stores in batteries.

How does an off grid solar system work?

An off-Grid solar system has four main components, a solar panel, solar inverter, battery, and balancing of the system. Solar panels generate DC Current in sunlight and store it in batteries. If you want to run DC applications (12V), such as Fans, Lights, you need a charge controller. Whereas, if you want to run AC appliances (220V), you need an inverter that converts DC Voltage to AC Voltage. Nowadays, all inverters work automatically, that is the electricity generated by the solar system charges batteries and runs appliances directly. Also, batteries run appliances directly in case of power failure.

The 3-Blocks in every Off-Grid System:

Off-Grid Overview/Components 

  • Production Block: Solar PV Modules

  • Storage Block: Charge Controller & Battery Bank

  • Usage Block: Solar Inverter & Switchboard

  • Off-Grid Inverter for Current Conversion

  • PV Modules for energy production

  • Battery Bank for energy storage

  • Charge Controller for battery protection

How can I calculate off grid solar system?

Most home appliances such as Fans, TV, Cooler, AC, Water Pump, etc. can work through this system. For instance, a 1 kW off-grid solar system is sufficient for a 2-4 BHK house. But if you also want to run 1HP Water Pump in your home you could use a 3 kW off-grid solar system. If you are planning to run an AC then you should use a 5 kW solar system. For commercial setups like a shop, clinic or small mill, petrol pump a 10 kW off-grid solar system should be used.

It is the most common type of solar power system with backup. It works in day and night both, during the day, solar panel charges the battery and runs the home appliances such as Air Conditioners, Cooler, Television and submersible pump. At night, when the sun is not available, Inverter runs your home appliances using the battery power.

Advantages & Disadvantages

Off-Grid Systems – Be Your Own Judge of this technology.

The Top Advantages:

  • Totally independent from the Power-Grid

  • Installed anywhere were energy is needed

  • Many applanations

  • Big savings in Power-Bills

The Top DISADVANTAGES

  • High costs associated with energy Storage! Batteries represent 70% of total cost.

  • Low efficiencies (14%-19%) of PV Modules

  • Short Battery Lifespan, these need to be replaces at least 4-6 times in the lifetime of the PV system.

What is the difference between on grid and off grid solar system?

The main differences between a grid-connected solar system (on-grid) and a stand alone solar system (off-grid) are:

  • An Off-Grid solar system will work even after a power cut, whereas an On-Grid won't work.

  • Off-Grid solar system is more expensive than a grid-connected solar system.