If you are planning solar panel installation in Bihar, the system capacity is one of the biggest factors affecting your investment. Among residential and small commercial projects, 3kW, 5kW and 10kW solar systems are commonly considered for homes, offices, shops, institutions and larger properties.
But the actual solar system price in Bihar depends on several factors, including the type of system, solar panel technology, inverter, mounting structure, installation requirements, roof condition, electrical work, warranty and applicable government incentives.
As a broad 2026 planning range, a residential on-grid system may cost approximately ₹1.6–₹2.4 lakh for 3kW, ₹2.5–₹3.5 lakh for 5kW, and around ₹5–₹7 lakh or more for 10kW, depending on equipment and project specifications. Current market listings show considerable variation between suppliers, so these figures should be treated as indicative rather than fixed prices.
For eligible residential consumers, the PM Surya Ghar Muft Bijli Yojana can substantially reduce the effective cost. The central subsidy reaches a maximum of ₹78,000 for systems of 3kW and above under the current structure.
This guide explains the expected 3kW, 5kW and 10kW solar system prices in Bihar, subsidy considerations, installation costs, differences between system types and how to choose the right capacity.
What Is the Solar System Price in Bihar in 2026?
There is no single government-fixed retail price for every solar system.
An indicative price range for installed on-grid residential systems is:
| Solar System | Approx. Gross Price | Central PM Surya Ghar CFA* | Approx. Balance After CFA* |
|---|---|---|---|
| 3kW | ₹1.60–₹2.40 lakh | Up to ₹78,000 | ₹82,000–₹1.62 lakh |
| 5kW | ₹2.50–₹3.50 lakh | Up to ₹78,000 | ₹1.72–₹2.72 lakh |
| 10kW | ₹5.00–₹7.00 lakh+ | Up to ₹78,000** | ₹4.22–₹6.22 lakh+ |
*Indicative figures only. Actual quotations depend on equipment, installation conditions, taxes and project scope.
**The residential central subsidy is capped at ₹78,000 under the current PM Surya Ghar structure, so installing a 10kW system does not produce a proportionally larger central CFA.
A recent Bihar report also indicates that the state has announced an additional ₹20,000 incentive alongside the central scheme, potentially bringing the combined benefit to ₹98,000 for eligible consumers. Because state incentives can have specific eligibility and implementation conditions, consumers should verify the latest Bihar government/BREDA rules before including this amount in a project calculation.
How Much Does a 3kW Solar System Cost in Bihar?
A 3kW solar system is one of the most popular choices for residential rooftop installations.
In 2026, a reasonable planning range for a complete 3kW on-grid system is approximately ₹1.60 lakh to ₹2.40 lakh, although quotations vary according to panel brand, inverter, structure and installation scope. Current market listings similarly show 3kW prices around this range.
3kW Solar Subsidy
For eligible residential consumers, the current PM Surya Ghar structure provides:
- ₹30,000 per kW for the first 2kW
- ₹18,000 for the third kW
- Maximum central CFA: ₹78,000
Therefore, a 3kW eligible system can receive up to ₹78,000 in central subsidy.
For example, if your complete installation quotation is ₹2,00,000:
₹2,00,000 − ₹78,000 = ₹1,22,000
This is an illustration rather than a guaranteed final payable amount.
Who Should Consider a 3kW System?
A 3kW system may be suitable for a household with moderate electricity consumption and sufficient rooftop space.
It can be considered for homes using appliances such as:
- Fans
- Refrigerators
- TVs
- Washing machines
- Water pumps
- Computers
- Lighting
- Moderate air-conditioning loads
The correct capacity should be based on actual electricity consumption rather than simply selecting the system that offers the maximum subsidy.
What Is the Cost of a 5kW Solar System in Bihar?
A 5kW solar system generally requires more panels, a larger inverter, additional mounting structure and more electrical equipment than a 3kW system.
Current 2026 market pricing for an on-grid 5kW system is broadly around ₹2.50–₹3.50 lakh before subsidy, depending on equipment and installation specifications.
After the maximum central CFA of ₹78,000, an indicative balance could therefore range from approximately ₹1.72 lakh to ₹2.72 lakh.
For example:
₹3,00,000 − ₹78,000 = ₹2,22,000
Again, this calculation assumes the project qualifies for the applicable CFA and that the quoted price represents the complete eligible installation.
Who Should Consider a 5kW System?
A 5kW system may be appropriate for:
- Larger homes
- Independent houses with higher consumption
- Villas
- Small offices
- Shops
- Clinics
- Schools
- Small commercial properties
It can be especially useful when the property has substantial daytime electricity consumption.
Before installing 5kW, however, review your electricity bills and available roof area.
How Much Does a 10kW Solar System Cost in Bihar?
A 10kW solar system is substantially larger and may be suitable for high-consumption homes, institutions, offices, commercial facilities or other properties with appropriate electrical infrastructure.
A broad 2026 planning range for an installed on-grid system is approximately ₹5 lakh to ₹7 lakh or more.
The actual price can change depending on:
- Number and type of solar panels
- Inverter configuration
- Mounting structure
- Roof or ground installation
- Cable length
- Electrical protection
- Transformer requirements
- Civil work
- Monitoring
- Installation complexity
The maximum central residential PM Surya Ghar CFA remains ₹78,000, rather than increasing proportionally with system size.
Therefore, a 10kW project requires considerably more customer investment after the central subsidy.
3kW vs 5kW vs 10kW Solar System
The right system depends primarily on electricity consumption and available installation space.
| Factor | 3kW | 5kW | 10kW |
|---|---|---|---|
| Suitable for | Moderate homes | Larger homes/businesses | High-consumption properties |
| Approx. gross price | ₹1.6–₹2.4 lakh | ₹2.5–₹3.5 lakh | ₹5–₹7 lakh+ |
| Central CFA ceiling | ₹78,000 | ₹78,000 | ₹78,000* |
| Roof requirement | Lower | Medium | Higher |
| Electricity generation | Moderate | Higher | Much higher |
| Investment | Lower | Medium | Higher |
*Residential subsidy eligibility and capacity rules should always be verified through the current official programme.
What Determines Solar Panel Installation Cost in Bihar?
The system capacity is only one part of the total cost.
Solar Panel Quality
Higher-efficiency modules or particular technology and manufacturer specifications can affect the overall price.
Inverter
The inverter is a major component of the system. Its capacity, efficiency, monitoring features and warranty can influence cost.
Mounting Structure
The structure must be appropriate for the roof and installation environment.
Roof Condition
A simple RCC roof may be easier to install on than a sloping, elevated or structurally complex roof.
Electrical Work
Additional cabling, earthing, protection devices and electrical modifications can increase the project price.
Installation Height
A rooftop located several floors above ground may require additional labour and safety arrangements.
Battery Storage
An ordinary on-grid system generally does not require batteries. Hybrid systems with battery backup cost considerably more.
What Is Included in a Complete Solar System?
When comparing a quotation, check whether the price includes:
- Solar PV modules
- Solar inverter
- Mounting structure
- DC cables
- AC cables
- Connectors
- Earthing
- Surge protection
- Electrical protection
- Monitoring system
- Installation labour
- Transportation
- Testing and commissioning
Some quotations may exclude certain civil or electrical works.
Always ask for a detailed bill of materials.
On-Grid vs Hybrid Solar System: Does the Price Change?
Yes.
On-Grid System
An on-grid solar system connects to the electricity grid and is generally the most economical option for reducing grid electricity consumption.
For many residential customers, this is the first option to evaluate.
Hybrid System
An off-grid system operates independently from the utility grid and generally requires battery storage.
It may be appropriate where grid electricity is unavailable or unreliable, but its initial investment can be higher.
Therefore, when someone asks for a “5kW solar system price,” always clarify whether they mean on-grid, hybrid or off-grid.
How Much Roof Space Is Needed?
The exact roof requirement depends on the panel wattage and layout.
As a general planning concept:
- 3kW requires moderate rooftop space
- 5kW requires more space
- 10kW requires substantially more space
The installer should consider maintenance pathways, shading, orientation and safe access instead of covering every available square metre with panels.
A professional solar site survey is therefore important before finalizing the system size.
How Much Electricity Can These Systems Generate?
Actual generation depends on location, weather, shading, panel orientation, system losses and equipment efficiency.
A 10kW system will generally have a greater annual generation potential than a 5kW system, while a 5kW system can generate more than a 3kW system under comparable conditions.
However, don’t select a system solely based on theoretical generation.
Your installer should provide a realistic generation estimate based on the property’s specific conditions.
How to Choose the Right Solar System Size?
Start with your electricity bills.
Review:
- Monthly units consumed
- Average electricity bill
- Daytime consumption
- Seasonal variations
- Future electricity requirements
- Available roof space
For example, if your electricity consumption is relatively moderate, installing 10kW simply because it produces more electricity may not be financially optimal.
The objective should be to select a system that provides a sensible balance between:
Electricity consumption + solar generation + investment + available roof area + expected savings.
What About Solar Subsidy in Bihar?
For eligible residential consumers, the PM Surya Ghar programme is a major factor when calculating the effective cost of rooftop solar.
The central structure provides up to ₹78,000 for eligible residential systems of 3kW or more.
Bihar has also recently announced an additional state incentive, according to current reporting, potentially increasing the combined benefit to ₹98,000 for eligible consumers.
Because subsidy programmes can change and eligibility conditions apply, homeowners should verify the latest information before signing a contract.
Does Subsidy Apply to Commercial Solar?
The residential CFA under PM Surya Ghar should not be treated as a general subsidy for commercial consumers.
Businesses planning commercial solar solutions should evaluate the applicable electricity regulations, project economics, financing, tax considerations and any relevant state incentives separately.
A commercial customer should obtain a project-specific financial analysis from an experienced solar EPC company in Bihar.
How to Compare Solar Quotations
Suppose one installer offers:
5kW = ₹2.60 lakh
and another offers:
5kW = ₹2.95 lakh
The first quotation is not necessarily better.
Compare:
- Panel brand
- Panel wattage
- Inverter model
- Structure quality
- Cable specifications
- Protection equipment
- Installation scope
- Warranty
- Monitoring
- Net-metering assistance
- After-sales service
A detailed quotation helps you understand what you are actually paying for.
How Can ZRN Solar Help With Solar Installation in Bihar?
If you are planning a residential or commercial solar project, ZRN Solar can be considered when evaluating solar system planning and installation requirements in Bihar.
The right approach is to begin with a site assessment and electricity-consumption analysis before deciding between a 3kW, 5kW or 10kW system.
Customers should compare equipment specifications, project scope, warranties and pricing before selecting an installer.
Conclusion
The cost of a 3kW, 5kW and 10kW solar system in Bihar depends on the system type, equipment quality, installation conditions and project requirements.
As a practical 2026 planning range, homeowners may encounter approximately ₹1.60–₹2.40 lakh for 3kW, ₹2.50–₹3.50 lakh for 5kW, and ₹5–₹7 lakh or more for 10kW on-grid systems. These are indicative figures rather than fixed market prices.
For eligible residential consumers, the current central PM Surya Ghar CFA can provide up to ₹78,000, while recent reporting indicates an additional Bihar state incentive may increase the combined benefit for eligible consumers. Always verify current eligibility and programme conditions before calculating your final investment.
The best system is not necessarily the largest one. Before choosing 3kW, 5kW or 10kW, evaluate your electricity consumption, roof area, daytime load, budget and expected solar generation.
For professional solar panel installation in Bihar, obtain a detailed site survey and compare complete quotations from qualified installers. ZRN Solar can be considered as one option when evaluating residential and solar project requirements in Bihar.
Frequently Asked Questions
What is the price of a 3kW solar system in Bihar?
A 3kW on-grid system may cost approximately ₹1.60–₹2.40 lakh before subsidy, depending on equipment and installation requirements.
What is the 5kW solar system price in Bihar?
A 5kW on-grid system may cost approximately ₹2.50–₹3.50 lakh before subsidy. Actual prices vary by brand, inverter, structure and installation scope.
How much does a 10kW solar system cost in Bihar?
A 10kW system may cost approximately ₹5–₹7 lakh or more, depending on the equipment, installation conditions and electrical requirements.
How much subsidy is available for a 3kW solar system?
Eligible residential consumers can receive up to ₹78,000 in central CFA under the current PM Surya Ghar structure.
Does a 5kW system receive more central subsidy than a 3kW system?
No. The central CFA reaches a maximum of ₹78,000 under the current residential structure, so increasing capacity beyond 3kW does not increase the central subsidy proportionally.
Which is better: 3kW or 5kW solar?
It depends on your electricity consumption, roof area and budget. A household with higher electricity usage may benefit from 5kW, while a smaller household may find 3kW more appropriate.
Is a 10kW solar system suitable for a home?
It can be suitable for a high-consumption home with sufficient roof area and appropriate electrical infrastructure. However, the system should be sized according to actual consumption.
Does a solar system price include installation?
Not always. Ask the installer to confirm whether panels, inverter, structure, cables, earthing, labour, transportation, commissioning and other services are included.