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Su-Kam: Off Grid – Solar Power System

Introduction: Solar Power System

Solar power is a free source of energy. You can use this free and unlimited energy source to run electrical appliances in your house. You can charge your battery at the same time as well. You also save money by not using the electricity from the grid. To use solar power, you need to install a solar power system in your house. There are three types of solar system – DC system, off-grid and on-grid solar system. In this video, we will understand how off-grid solar power system works.


Off Grid Solar Power System

Off-grid solar system is an independent system that uses the electricity coming from the solar power station. It converts the solar energy into electricity for usage while charging the battery. Mains and Solar charge controller are built inside an off grid solar system. With the help of solar charge controller, you can charge the battery and run the load in your house at the same time. When solar power is not available, you can run the appliances with the help of mains.

Brainy Eco: Solar Power System

Brainy-Eco can run with both mains and solar power. It offers smart working conditions to run the load in your house and charge the battery. For example, we have connected 300 W panel in parallel with the system. Along with this, you can also install 150 AH or 1800 W battery. Let’s assume that you have connected household appliances with Brainy Eco. This smart solar home UPS will run all appliances very easily and can intelligently charge the battery as well.

Brainy Eco: First Example

Let us assume that the solar off-grid system is getting 300W solar power from 300W solar panel and the electrical appliances in your house that you want to run through solar energy will require 200W power. In this example, the system will use 200W out of 300W to run the load and the remaining 100W will be used to charge the battery. Off-grid solar system will first focus on running the appliances with free solar energy and then will focus on using the remaining energy to charge the battery. That is why this smart off-grid system does not use mains supply which helps you save on electricity bill.

Brainy Eco: Second and Third Example

300W solar panel is only producing 200W power and you are still running 200W appliances. The off-grid system will use the entire energy to run these appliances. In this condition, the battery will not get charged but will also not get discharged. In the third example, 300W solar panel is generating 100W solar power and you are running 200W appliances. Off-grid system will take remaining 100W from battery mains and run the load.


In all three example scenarios, we would not use the Mains supply. Off-grid solar system utilizes solar power to the maximum and uses it to run free solar power. It charge the battery effectively and hence saves your electricity bill.

Exceptions for Mains Connection

In an off-grid system, how and when the mains system gets connected has different conditions. As you can see in the third example, the 1800W battery connected to the system slowly gets discharged by 100W.

Mains Connection Example

In the default scenario when the battery’s reserve come down to 70%, the mains will get connected to the system. This condition is very beneficial for those who want to keep more reserve in their battery so that when solar and mains both are unavailable. Places with frequent power cut can run the appliances with the reserve battery for a longer time. You can also choose to bring down the battery reserve to 50% or 30%.

How Mains Connection Works

As soon as the mains get connected in the off-grid solar power system, the load in your house will bypass Solar and would run with Mains power. During this time if solar power is available, then this system will utilise solar power to charge the battery.

Gist Points

Off-grid solar power system uses just one power source at a time to run the load.

If solar energy is available, then the load will run through solar power and the mains will disconnect the power.

If less power is generated through Solar panel, then the remaining power will be taken
from the battery to run the load. In this condition also, the system disconnects the mains.

Intelligent Sharing of Charge

You can also choose mains power to charge the battery along with Solar Power System. Ideally 180W power is required to charge 1800W battery. If 100W is available through Solar Power System, Intelligent Sharing of Charge will allow 80W from Mains

You will not get this feature in any normal off-grid solar UPS. If you want, you can switch off the mains charging with the help of a switch in this off-grid solar power system. This can help you save on your electricity bill.