Off-Grid Solar System Buying Guide – SolarWiser
An off-grid solar system is a standalone power solution designed for homes,
farms, and facilities where grid electricity is unavailable or unreliable.
Unlike on-grid systems, off-grid setups store excess solar energy in batteries,
ensuring power availability even at night or during outages.
At SolarWiser, we help customers evaluate whether an off-grid or on-grid
system is technically and financially suitable. For most urban households,
on-grid systems are more cost-effective due to subsidy benefits and faster ROI.
However, off-grid systems are essential in remote or high-outage zones.
What is an Off-Grid Solar System?
An off-grid solar system generates electricity using solar panels and stores
it in batteries instead of exporting excess power to the utility grid.
The stored energy is later converted into AC electricity to run household
appliances.
Core Components of an Off-Grid Solar System
-
Solar Panels
(Mono / Poly / Bifacial)
-
Heavy-Duty
Mounting Structure (Wind resistance up to 170 km/h)
-
Battery Bank
(Lead-Acid or Lithium-Ion)
-
MPPT Charge
Controller
-
Off-Grid Solar
Inverter (Pure Sine Wave)
-
DC/AC Cables,
Combiner Boxes & Lightning Protection
How Does an Off-Grid Solar System Work?
1. Solar panels absorb sunlight and generate DC electricity.
2. The charge controller regulates voltage and optimizes power through MPPT
technology.
3. Excess electricity charges the battery bank.
4. The inverter converts stored DC power into AC electricity.
5. Power is supplied to your home distribution board.
Is There Any Subsidy for Off-Grid Solar?
Under the PM Surya Ghar Muft Bijli Yojana, the Government of India
provides subsidy only for on-grid rooftop solar systems.
Off-grid solar systems are currently not eligible for central subsidy.
Off-Grid Solar System Price in India (2025 Estimates)
| System Capacity |
Estimated Price Range (₹) |
| 1 kW |
₹85,000 – ₹1,00,000 |
| 2 kW |
₹1,70,000 – ₹2,00,000 |
| 3 kW |
₹2,55,000 – ₹3,00,000 |
| 4 kW |
₹3,40,000 – ₹4,00,000 |
| 5 kW |
₹4,25,000 – ₹5,00,000 |
| 10 kW |
₹6,00,000 onwards |
*Prices are indicative market estimates. Final cost depends on battery type,
inverter capacity, structure height, wiring distance, and load requirements.
Battery Requirement (Approximate)
| System Size |
Estimated Battery Requirement |
| 3 kW |
8–9 batteries (100 Ah each) |
| 5 kW |
10–12 batteries (150–200 Ah each) |
Advantages of Off-Grid Solar
-
Ideal for remote
locations without grid access
-
Complete energy
independence
-
Clean and
zero-emission energy
-
Suitable for
farms, rural homes & telecom sites
-
Works even during
grid failures
Limitations & ROI
Off-grid systems have a longer payback period (typically 6–7 years)
because batteries significantly increase the initial investment.
Batteries also require replacement every few years depending on usage.
In comparison, an on-grid system typically achieves ROI in 3–4 years
and benefits from government subsidy and net metering credits.
Off-Grid vs On-Grid: Which Should You Choose?
✔ Choose Off-Grid if your location has no grid connectivity or severe power
cuts.
✔ Choose On-Grid if you have a reliable connection and want lower investment,
subsidy benefits, and faster returns.
