Off Grid Solar System For Home: Prices, Subsidy, ROI & Working
SolarSquare is born out of the passion to de-escalate pollution and escalate the adoption of mass solar. Two like-minded environment pros from IIT Bombay started SolarSquare in 2015 as a two-member pack. Now, we’re the 3rd largest EPC contractor for residential installations in India. We’ve helped 6000+ homes go solar and have been helping our customers save up to 90% on their monthly electricity bills. We install both on-grid and hybrid solar systems. In the near future, we will start the installation of off-grid solar systems too. Some of the services that have set us apart from other vendors include the following.
- We use premium-quality prefabricated mounting structures that are resilient and durable enough to handle cyclonic wind speeds reaching up to 150 kmph
- We offer free solar consultation services
- Our solar consultants and design team procures a 3D model of how solar would look on your rooftop within 15 minutes of the site survey
- We offer easy, 10-minute loan approval
- We offer many EMI schemes; zero-cost being the most popular one
- We offer a 5-year AMC contract
We’re on a mission to build a legacy brand that values its customers the most.
Overview of an off grid solar system
An off-grid solar system is also known as a stand alone solar system. Why? Because it’s not connected to the grid. It works as an isolated island of its own. An off grid solar power plant is an intricate setup of the following components.
- Solar panels (modules)
- Mounting structures
- Solar charge controller
- Solar inverter
- Solar accessories
Off grid solar components and their working
#1. Solar panels
Solar panels are made up of solar cells. When they’re made of one single silicon crystal, the resulting panel is monocrystalline. When they’re made of multiple silicon crystals, the resulting panel is polycrystalline (multicrystalline).
The efficiency of both types differ but they work the same way.
Off grid solar panels trap sunlight and convert it into DC electricity. The one thing that should be taken care of at the time of installation is that the panels should not be clouded by shadows.
#2. Solar inverter
The power from solar panels is in the form of direct current. Home appliances run on AC power. This is where the solar inverter comes into the picture. It converts DC power into AC power. An off grid solar inverter, just like an on-grid inverter, is the heart of the solar system.
Off grid solar functions on batteries. During the sunshine hours, the electricity that the panels are producing is used to run the house. Whatever is extra is used to charge the batteries. That same power from the battery is then used to keep the house running at night.
#4. Charge controller
The charge controller in off grid solar controls the charge. It’s in parallel with the solar inverter. The panels produce electricity that goes into the charge controller. It’s the charge control that feeds power into the inverter as well as uses the extra units to charge the batteries.
#5. Mounting structures
You have the panels and the inverter, but without proper mounting structures, the system cannot be set up. The mounting structures should be at a proper tilt angle (near perpendicular to the sun for as long as possible) so that they receive maximum sunlight.
Hot-dipped zinc galvanized mounting structures by SolarSquare are unbeatable quality products.
#6. Solar accessories
You know the major components of an off grid solar system but there are other accessories without which the system will not be safe. Here are the accessories we’re talking about:
- DC cables and DC combiner box
- AC cables and AC combiner box
- MC4 connectors
- Earthing strips and conduit trays
- Lightning arrester
Working of an off grid solar system for home
The working of an off grid pv system isn’t super complex. We’ve simplified it for you. Have a look.
Off grid solar panels absorb and trap sunlight, converting it into direct current (DC)
The DC current goes into a combiner box
From the combiner box, it goes into the solar charge controller
The charge controller gives current to the batteries and charges them
The charge controller also communicates with the off grid solar inverter
The off grid inverter converts DC power into AC power
Most off grid solar inverters nowadays have built-in battery management systems
The solar inverter finally passes the AC current to run household appliances
Off grid solar system with different capacities
You know the components, you also know the functioning. So, it’s time that we walk you through the specifics of different types of off grid solar power plants. We’ve tabulated the details below.
|Capacity||Units generated / day||Units generated / year|
|1 kW off grid solar power system||4 units on average||1440 units on average|
|2 kW off grid solar power system||8 units on average||2880 units on average|
|3 kW off grid solar power system||12 units on average||4320 units on average|
|4 kW off grid solar power system||16 units on average||5760 units on average|
|5 kW off grid solar power system||20 units on average||7200 units on average|
|10 KW off grid solar power system||40 units on average||14400 units on average|
Needless to say, the higher the capacity of the off grid solar system, the more units it will generate. The one you choose should cover your power requirements.
Fun fact: Did you know that most houses in India install on-grid solar systems for homes? However, when there’s no grid nearby (in rural areas or for agricultural purposes), a stand alone solar system i.e. off grid solar system is the best option.
Cost of an off grid solar power system
When we talk about the off grid solar system price, we’re talking about everything ranging from procurement to installation and after-installation services.
Including everything, the off grid solar system price comes between ₹85-100/ watt peak including batteries. This price variation is because the end cost depends on the battery backup.
For instance, if somebody requires a backup for 30 minutes to an hour, smaller batteries will be able to cater to that need. On the other hand, if somebody requires a backup of 6-7 hours, the battery size increases; so will the cost.
Putting it out simply, the higher the battery’s capacity, the more will the off grid solar system price.
And we, at SolarSquare, have the right people, tools, and experience to handle installations from scratch.
ROI on an off grid system
ROI (return on investment) in the case of off grid solar takes more time than an on-grid system of the same capacity. Why? Well, because batteries are expensive. Usually, the off grid solar system price breaks even in about 6-7 years.
This is actually one of the limitations of an off grid solar system. Batteries are yet not that scalable due to their high cost. That’s why it takes time for the cost to break even.
Benefits of using a stand alone solar system
Yes, ROI is a limitation of having an off grid solar system, but off grid power has certain amazing benefits that make it a good investment. Have a look.
- A solar power off grid system is the only option in places where there’s no grid; mostly in rural areas.
- Off grid power is clean and green. Not only does it power homes where there’s no grid, but it also ensures that no pollution is being caused in lieu of generating electricity.
- The cost of fossil-fuel-based electricity from the grid is super expensive. So, even though the investment in an off grid solar system takes a little longer to break even, it is still more economical than having to pay for grid electricity.
A solar power off grid system aka a stand alone solar system is the perfect solution in places where there’s no grid.
Undoubtedly, the off grid solar system price breaks even in about 6-7 years, but when you look at it in a way that grid electricity from fossil fuels is extremely expensive, the cost of an off grid solar system for home will automatically be justified.
1. What is an off-grid solar system?
An off grid solar system is also known as a stand alone solar system. It works independently from the grid.
Solar panels turn sunlight into electricity and a charge controller distributes that electricity to run household appliances during the sunshine hours and simultaneously charges the batteries when there’s extra power.
The stored energy in the batteries is then used to keep the house running at night.
2. What is the drawback of off-grid system in solar electric power?
Its cost is its major drawback. The off grid solar system price with batteries is between ₹85-100/ watt peak. And the installation cost breaks even in about 6-7 years.
3. How does an off-grid solar system work?
Here’s the simplest explanation of how an off grid solar system for home works:
- Off grid solar panels absorb and trap sunlight, converting it into direct current (DC)
- The DC current goes into a combiner box
- From the combiner box, it goes into the solar charge controller
- The charge controller gives current to the batteries and charges them
- The charge controller also communicates with the off grid solar inverter
- The off grid inverter converts DC power into AC power
- Most off grid solar inverters nowadays have built-in battery management systems
- Finally, the solar inverter passes the AC current to the load