Top News

Planning to install a battery-based solar system? Here's how much different off-grid setups cost, what appliances they can power, and whether they can run an air conditioner.

As electricity prices continue to rise and power outages remain common in many regions, more homeowners are turning to solar energy. While on-grid solar systems are suitable for areas with a stable electricity supply, off-grid solar systems are designed for locations where frequent or prolonged power cuts make battery backup essential.

Unlike on-grid systems, off-grid installations include batteries to store electricity generated during the day. This increases the overall installation cost and, in most cases, these systems are not eligible for direct government rooftop solar subsidies.

If you're considering an off-grid setup, here's a comparison of the estimated cost, battery requirement, appliance support, and space needed for 1kW, 3kW, and 5kW systems.

1kW Off-Grid Solar System

Estimated Cost

A 1kW off-grid solar system typically costs between ₹85,000 and ₹1,05,000, depending on the brand, battery type, inverter, and installation charges.

Battery Requirement

Most 1kW systems use:

• 2 batteries of approximately 150Ah each.

Appliances It Can Run

A 1kW setup is suitable for basic household needs, including:

• 3–4 LED lights

• 2–3 ceiling fans

• One television

• Laptop and mobile charging

High-power appliances such as air conditioners, water heaters, and large water pumps are generally not recommended with this capacity.

Best For

• Small families

• One or two-room homes

• Small shops

• Rural areas with frequent power cuts

3kW Off-Grid Solar System

Estimated Cost

A 3kW battery-based solar system generally costs around ₹2.4 lakh to ₹2.8 lakh.

Battery Requirement

Typical configurations include:

• Four 150Ah lead-acid batteries

Alternatively, homeowners can choose a 48V lithium battery pack, which is more expensive but offers:

• Longer service life (around 10–12 years)

• Faster charging

• Lower maintenance

• Less installation space

Appliances It Can Run

A 3kW system can comfortably support:

• LED lights

• Fans

• Refrigerator

• Television

• Desktop computer

• Mixer grinder

• Up to a 1 HP water pump

Running heavy loads such as large air conditioners or electric geysers continuously may not be practical, especially when operating only on battery backup.

Best For

• Medium-sized households

• Three to four-bedroom homes

• Families looking for greater energy independence

5kW Off-Grid Solar System

Estimated Cost

Installing a 5kW off-grid solar system can cost approximately ₹3.8 lakh to ₹4.5 lakh, depending on system specifications.

Battery Requirement

Most installations require:

• 4 to 8 batteries of around 150Ah each

Battery requirements vary depending on the desired backup duration and battery technology.

Appliances It Can Run

A 5kW system can support most household appliances, including:

• Refrigerator

• Washing machine

• Water pump

• Microwave or electric oven

• Lighting and fans

• Multiple electronic devices

Under suitable sunlight conditions, it may also operate one 1.5-ton inverter air conditioner during daytime. However, using an AC extensively on battery power can drain stored energy quickly.

For better efficiency, heavy appliances are generally recommended during daylight hours when solar panels are actively generating electricity.

Best For

• Large homes

• Villas

• Farmhouses

• Small offices

• Locations with little or no reliable grid power

Factors That Affect the Cost

The final installation cost depends on several factors, including:

• Type of solar panels (Mono PERC, Bifacial, etc.)

• Battery technology (Lead-acid or Lithium-ion)

• Inverter capacity

• Backup duration required

• Brand selection

• Installation and wiring costs

Lithium batteries usually increase the upfront cost but require less maintenance and generally last much longer than conventional lead-acid batteries.

Roof Space Required

Approximate roof area needed:

System Capacity	Roof Space Required
1kW	Around 100 sq. ft.
3kW	Around 300 sq. ft.
5kW	Around 500 sq. ft.

Adequate sunlight exposure is equally important to achieve optimum performance.

Are Off-Grid Systems Eligible for Subsidy?

Government rooftop solar subsidy programs are primarily designed for eligible grid-connected residential solar systems. Since off-grid systems rely on battery storage and operate differently, they generally do not qualify for the same direct subsidy benefits. Homeowners should check the latest central and state government policies before making a purchase.

Final Thoughts

Off-grid solar systems are an effective solution for homes and businesses facing unreliable electricity supply. While the addition of batteries significantly increases the initial investment, these systems provide backup power and greater energy independence. Choosing between a 1kW, 3kW, or 5kW system depends on your electricity consumption, appliance requirements, available roof space, and budget.

---