Off-grid Solar System Buying Guide

When to Use an Off-Grid Solar Panel System?

Using an off-grid solar plant for homes makes most sense in areas where the grid supply is unreliable or unavailable. In both cases, your home will rely on battery backup for 24/7 power.

Here are the most common use cases where off-grid solar power systems are highly recommended:

• Remote and rural areas with no utility grid
• Urban and semi-urban areas that face extreme power cuts, making the grid unreliable

On the flip side, if you live in an area with a reliable grid connection, an on-grid solar system is the better choice as it’s cheaper!

What Are the Components of an Off-Grid Solar System?

Now, let’s break down the entire off-grid solar system component by component so you can understand the role of each individual component in electricity generation.

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).
• When they have solar panels on both the front and the rear, the resulting panel is bifacial.

• Off-grid solar panels trap sunlight and convert it into DC electricity. The one thing that should be taken care of during off-grid solar installation is to ensure that shadows do not block the panels.

2. Off-grid PV inverter

The inverter does the heavy lifting in any solar system. It converts DC power from the panels and battery into AC power your home can use, manages the flow of energy between solar, battery, and load, and determines how efficiently each unit of generated electricity reaches your appliances. A weak solar inverter can easily lower the performance of an otherwise good system.

For this reason, we use grid-connected (hybrid) inverters in our off-grid solar products and installations. The reasoning is that hybrid inverters are built on newer technology, handle lithium batteries, and give you the option to connect to the grid later without replacing equipment.

Here’s why grid-compatible inverters are the better fit for off-grid power packs:

• Lithium-optimized: Direct integration with the battery management system (BMS) extends battery life to 15-20 years or more.
• 97%+ efficiency: Dual MPPT (Maximum Power Point Tracking) captures more solar across varying sunlight conditions and cuts conversion losses by 5 to 10%.
• Rugged performance: Handles voltage surges and high-load appliances like water pumps reliably, which matters in conditions where grid quality and load patterns are unpredictable.

• Future-proof: If you decide to connect to the grid or add battery energy storage (BESS) later, the same inverter supports it. You will not need rewiring or an equipment swap.

The off-grid solar inverter price is about 20-30% of the entire setup’s cost. 50-60% is the lithium-ion battery cost, and the remainder is the cost of all other solar components.

3. Batteries

An off-grid system functions on batteries. 

• During sunshine hours, the electricity the panels produce 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 solar panel charge controller in an off-grid solar system manages charging. 

• The panels produce electricity 
• The electricity then goes into the charge controller 
• The charge controller feeds power into the inverter, as well as uses the extra units to charge the batteries

A charge controller is usually built into modern solar inverters rather than being a separate component.

5. Mounting structures

You have the panels and the inverter, but the system cannot be set up without proper mounting structures. The mounting structures should be at a proper tilt angle (near-perpendicular to the sun for as long as possible), so they receive maximum sunlight.

6. Solar accessories

You know the major components of an off-grid solar system, but there are other accessories that are essential for the system to 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

What’s the Off-Grid Solar System Price in India in 2026?

The off-grid solar system price in India varies based on factors such as:

• The system capacity
• The type of solar panels 
• The type of solar inverter 
• Types of batteries (12 volt, 24 volt, or 48 volt)

Before we walk you through the prices based on multiple factors, let’s address the matter of the off-grid solar subsidy in India in the section below!

What about the Off-Grid Solar System Subsidy?

To clear the air once and for all, the Indian government does not offer a subsidy on off-grid solar systems under the PM Surya Ghar Muft Bijli Yojana. You need to install a grid-connected solar system to receive the central government’s subsidy.

That said, let’s check out the off-grid solar system price based on system capacity:

*Please note: *The above-mentioned off-grid solar energy system prices are indicative and exclusively for lithium-ion batteries (LFP). The final prices may vary from the stated range depending on the type of solar batteries, panels, brand, and inverter type you choose. SolarSquare installs rooftop solar systems for housing societies, homes, commercial buildings, and industrial facilities, using high-efficiency solar panels. We sell off-grid and hybrid solar systems in a select few cities.

How to Size a Battery for Off-Grid Solar Products?

The battery is the largest line item in off-grid solar power systems, and four design inputs drive its size:

• Autonomy for 1 full day: The battery is sized to cover your entire 24-hour load, including the next morning’s usage before the sun comes back up.
• Depth of Discharge (DoD) is 90%: The system uses 90% of the battery’s total capacity in each cycle. The remaining 10% is held back to protect battery health and extend lifespan.
• Round-Trip Efficiency (RTE) of 85%: Roughly 15% of the energy stored in the battery is lost during the charge-discharge cycle. The battery is sized accordingly so the usable output matches your actual load.
• Day-night load split: About 70% of a home’s energy consumption happens during daylight hours and 30% at night. The battery is sized to cover the full night load plus a buffer for cloudy days when daytime solar is weak.

This is why the battery in off-grid solar products is 3 to 4 times larger than the battery in a hybrid system of the same inverter size. Since the off-grid system has no grid to fall back on, the battery is the single biggest cost, right after the inverter.

Advantages and Disadvantages of Installing Off-Grid Solar Systems in India?

Here’s a clear breakdown of the benefits of installing off-grid solar electric systems in India:

• Power where you need it: An off-grid solar system is the only option in rural areas without grid power.
• Zero-emission energy source: Off-grid solar power is clean and green. Not only does it power homes where there’s no grid available, but it also ensures no pollution is generated during electricity generation.

That said, let’s now walk you through a few limitations of off-grid solar electric systems! 

• The off-grid solar system price breaks even in about 6-7 years. For an on-grid solar system, the payback period is 3-4 years.
• Repeated investment in batteries since they have to be replaced after their life is over.
• There’s no subsidy to reduce the cost of installing off-grid solar systems.

Difference Between Off-Grid and On-Grid Solar Systems

The main difference between off-grid and on-grid solar systems is their connection to the grid and batteries. While an on-grid solar system is connected to the grid, not to batteries, an off-grid solar PV system is standalone. It’s not connected to the grid but to lead-acid or lithium batteries that can store solar energy generated by the panels during the day for later use. 

Here’s a tabulated snapshot of the key differences between the two system types:

Conclusion

Installing an off-grid solar system in India is the best way to light homes in areas without (or with unreliable) power grids. The electricity generated can light up homes without causing pollution.

While off-grid solar systems cost more than on-grid systems in India, investing in an off-grid system is worth it when the power grid is unavailable or unreliable. In fact, off-grid solar power systems are a great option in industrial setups. For any further information about installing rooftop solar, you can book a free solar consultation call with SolarSquare now.