On-Grid vs Off-Grid Solar Under PM Surya Ghar 2026
Compare subsidy eligibility, outage behaviour, battery requirements, metering, installation cost, maintenance and long-term savings before choosing an on-grid, grid-connected hybrid or fully off-grid home solar system.
Last Updated: July 25, 2026
First choose the required capacity using the home solar system-size guide and confirm safe space through the rooftop-area planning guide .
System-Choice Questions Covered Here
- On-grid vs hybrid vs off-grid table
- How an on-grid system works
- How an off-grid system works
- How a hybrid system works
- Which system receives subsidy?
- Interactive system selector
- What happens during a power cut?
- Battery sizing and cost factors
- Metering and zero-export systems
- Installation-cost comparison
- Savings and payback
- Maintenance comparison
- Best use case for each type
- Can the system be changed later?
- Vendor quotation checklist
- Common selection mistakes
- Frequently asked questions
On-Grid vs Hybrid vs Off-Grid Solar: Quick Comparison
| Feature | Standard on-grid | Grid-connected hybrid | Fully off-grid |
|---|---|---|---|
| DISCOM grid connection | Required | Required | Not used for system operation |
| Normal battery requirement | No | Yes when backup/storage is included | Usually essential |
| PM Surya Ghar household CFA | Eligible | Conditional | Not eligible |
| Export to grid | Normally possible under approved arrangement | May export or operate as zero-export, depending on design and rules | No grid export |
| Power during grid outage | Normally shuts down for anti-islanding safety | Selected backup loads may operate when correctly designed | Can operate from solar and battery within design limits |
| Initial cost | Usually lowest | Higher because of hybrid inverter, battery and controls | Often highest for comparable reliable energy supply |
| Maintenance | Lower | Higher than on-grid | Highest battery dependence and energy management |
| Best suited to | Reliable-grid homes focused on bill savings | Homes needing limited backup plus grid savings | Remote sites without a practical grid connection |
How a Standard On-Grid Solar System Works
Solar modules produce DC electricity, and a grid-tied inverter converts it into grid-compatible AC electricity. Home loads use available solar power first according to the electrical arrangement. Any shortfall comes from the grid, while surplus can flow through the approved metering arrangement.
Lower Equipment Cost
No large battery bank is required for normal bill-saving operation.
Higher Conversion Efficiency
Energy can serve loads or export without repeated battery charging and discharging.
Grid as Balancing Source
The grid supplies demand when solar output is insufficient.
No Normal Outage Backup
The inverter generally shuts down when the grid fails to protect line workers and equipment.
The complete installation and billing path is explained in the PM Surya Ghar net-meter process guide .
How a Fully Off-Grid Solar System Works
A fully off-grid system operates independently of the DISCOM grid. Solar power supplies loads and charges batteries; stored energy supports demand when sunlight is unavailable. A generator may be added for prolonged low-solar periods.
- Useful where no dependable grid connection is available
- Can provide local power during grid absence
- Requires careful daily-energy and peak-load calculation
- Needs enough storage for night and low-solar periods
- May require load prioritisation and backup generation
- Battery replacement materially affects lifetime cost
How a Grid-Connected Hybrid Solar System Works
A grid-connected hybrid system combines solar, the DISCOM grid and battery storage. Depending on the inverter and approved wiring, it may supply selected backup circuits during an outage, store excess solar, restrict export or export under an approved arrangement.
Solar + Grid + Battery
The system can use multiple energy sources according to programmed priorities.
Backup Load Panel
Only designated essential loads may remain live during an outage.
Export or Zero Export
Operation depends on system design, protection and State or DISCOM approval.
Which Solar Type Is Eligible for PM Surya Ghar Subsidy?
| System configuration | CFA position | Important condition |
|---|---|---|
| Grid-connected system with approved net metering | Eligible | Residential connection, registered vendor, DCR modules and successful DISCOM process |
| Grid-connected system under net billing, gross, virtual or group metering | Eligible when approved | The arrangement must be approved by the relevant State/UT regulator |
| Grid-connected battery hybrid that does not export | Conditional | Regulatory approval, DISCOM inspection and reverse-power-relay protection |
| Behind-the-meter grid-connected zero-export system | Conditional | Must remain grid connected and satisfy the applicable approval process |
| Fully off-grid system | Not eligible | No residential CFA under this component |
| Battery added to an eligible grid-connected system | Solar modules may remain eligible | Battery capacity does not increase CFA |
Check the exact amount through the PM Surya Ghar subsidy calculation guide .
Interactive Home Solar Type Selector
This selector provides an educational shortlist. It does not replace a DISCOM, regulatory, electrical or structural approval.
What Happens During a Power Cut?
| Situation | On-grid system | Hybrid system | Off-grid system |
|---|---|---|---|
| Grid fails in daytime | Normally shuts down because of anti-islanding | May continue selected backup loads when designed for islanded backup | Continues within available solar, battery and inverter limits |
| Grid fails at night | No solar supply | Battery may support selected loads | Battery supports loads until reserve is depleted |
| Battery becomes empty | Not applicable | Backup stops unless grid or another source returns | Loads stop unless solar or generator is available |
| High-load appliance starts | Grid can normally support it when available | Backup output may trip if the selected circuit exceeds inverter limits | Requires sufficient inverter surge and battery output |
Battery Sizing and Cost Factors
Battery selection should begin with essential backup loads and required backup hours—not with solar-panel capacity alone.
Essential load in watts × desired backup hours ÷ 1,000 = required usable battery energy in kWh
| Battery input | Why it matters |
|---|---|
| Essential-load watts | Sets continuous inverter and battery demand |
| Motor or compressor surge | Pumps and refrigerators can need higher starting power |
| Required backup hours | Directly increases storage requirement |
| Usable depth of discharge | Not all nameplate capacity should be treated as usable |
| Inverter and battery efficiency | Energy is lost during conversion and storage |
| Battery chemistry and cycle life | Affects safety, usable energy, maintenance and replacement timing |
| Temperature and installation location | Can materially affect life and performance |
| Warranty terms | Years alone do not describe cycle or throughput coverage |
Metering, Export and Zero-Export Protection
The official residential guidelines cover State-approved net metering, gross metering, net billing, virtual net metering and group net metering. For a grid-connected system that does not export, the DISCOM may inspect the installation and verify reverse-power-relay protection.
- Confirm whether the system will export electricity.
- Identify the approved State metering mechanism.
- Ask who supplies and installs the meter.
- Confirm zero-export or reverse-power-relay requirements.
- Obtain a single-line electrical diagram.
- Identify the backup-load distribution board.
- Confirm inverter anti-islanding compliance.
- Complete the appropriate DISCOM agreement and inspection.
Connection and approval stages are explained in the feasibility and DISCOM approval guide .
On-Grid, Hybrid and Off-Grid Cost Comparison
There is no universal package price. The same solar-module capacity can produce very different quotations because storage, inverter architecture, control equipment and backup wiring differ.
| Cost category | On-grid | Hybrid | Off-grid |
|---|---|---|---|
| Solar modules and structure | Required | Required | Required |
| Inverter | Standard grid-tied | Hybrid or multimode, usually more expensive | Off-grid inverter or inverter-charger |
| Battery | Normally none | Required for backup/storage function | Normally essential |
| Backup distribution board | Not normally required | Often required for selected loads | Load distribution is designed around inverter supply |
| Metering and DISCOM work | Required | Required when grid connected | Not part of the off-grid energy system |
| Replacement reserve | Mainly inverter and general components | Inverter plus battery | Battery is a major recurring cost |
| PM Surya Ghar CFA | Eligible when compliant | Conditional grid-connected eligibility | No CFA |
Compare actual system prices through the 1kW cost guide , 2kW cost guide and 3kW cost guide .
Which System Usually Gives Better Savings and Payback?
On-Grid
Usually best bill-saving economicsLower initial cost and no battery replacement often produce a shorter payback where the grid is reliable and export treatment is reasonable.
Hybrid
Backup plus savingsThe battery adds resilience but can lengthen financial payback. Value backup separately from electricity savings.
Off-Grid
Energy access, not subsidy paybackOften justified where grid connection is unavailable or extremely unreliable, rather than by the shortest financial return.
Run project-specific numbers with the PM Surya Ghar savings calculator .
Maintenance and Replacement Comparison
| Maintenance item | On-grid | Hybrid | Off-grid |
|---|---|---|---|
| Module cleaning and inspection | Required | Required | Required |
| Inverter monitoring | Required | More settings and operating modes | Critical for energy availability |
| Battery health | Not applicable | Regular monitoring required | Central to system reliability |
| Load management | Minimal | Required during backup mode | Required every day during limited-energy periods |
| Replacement planning | Inverter and protection components | Inverter, battery and controls | Battery, inverter and possible generator |
Registered vendors must provide the applicable five-year comprehensive maintenance support for scheme installations. Keep every warranty and serial record using the PM Surya Ghar documents checklist .
Best Use Case for Each Solar Type
Choose On-Grid When
- A reliable electricity connection exists
- Bill reduction is the main goal
- Outage backup is not essential
- Lower upfront cost is important
- PM Surya Ghar CFA is a priority
Consider Hybrid When
- Selected critical loads need backup
- Power cuts are frequent or costly
- Battery replacement is affordable
- Local regulations permit the design
- The vendor can obtain DISCOM acceptance
Consider Off-Grid When
- No practical DISCOM supply exists
- Energy access is more important than CFA
- Loads can be strictly managed
- Battery and generator costs are acceptable
- The user understands there is no scheme CFA
Can You Add a Battery or Change the System Later?
Modification may be technically possible, but it should not be treated as a simple plug-in purchase. Inverter compatibility, protection, backup wiring, warranties, DISCOM approval and portal records may be affected.
- Check whether the existing inverter is battery-compatible.
- Identify which loads need backup and their surge requirements.
- Obtain a revised electrical single-line diagram.
- Confirm whether the change affects metering or zero-export protection.
- Seek DISCOM or regulatory confirmation where required.
- Update warranties and vendor responsibility in writing.
- Do not claim additional CFA merely because a battery is added.
Track any official project update through the application-status guide .
Vendor Quotation Checklist for On-Grid, Hybrid or Off-Grid
- Exact system type and operating modes
- Solar-module make, model, wattage, quantity and DCR status
- Inverter make, model, capacity and grid or backup certification
- Whether the inverter shuts down or supports backup during outages
- Backup-load list and maximum continuous and surge output
- Battery chemistry, gross and usable kWh
- Battery cycle, throughput and replacement warranty
- Export, zero-export and reverse-power-relay design
- Metering and DISCOM approval responsibility
- Single-line electrical diagram
- Separate prices for solar, battery and backup wiring
- Eligible CFA amount based only on solar-module capacity
- Five-year maintenance scope
- Payment milestones and correction responsibility
Select only an eligible installer through the registered-vendor guide .
Common On-Grid, Hybrid and Off-Grid Selection Mistakes
Expecting Outage Power From On-Grid
A standard grid-tied inverter normally shuts down when the grid fails.
Assuming Battery Gets Extra CFA
Subsidy is calculated from eligible module DC capacity.
Calling Off-Grid “Hybrid”
A fully independent system does not become CFA-eligible because of a product label.
Backing Up the Whole House
Air conditioners, pumps and heaters can make battery cost impractical.
Ignoring State Approval
Zero-export or hybrid eligibility can depend on the regulator and DISCOM.
Comparing Only Purchase Price
Battery replacement and maintenance can dominate lifetime cost.
No Essential-Load List
Battery sizing without load watts and backup hours is unreliable.
Full Payment Before Approval
Use milestones tied to accepted design, installation and commissioning.
Frequently Asked Questions
Is on-grid solar eligible for PM Surya Ghar subsidy?
Yes, an eligible grid-connected residential rooftop system can receive CFA after meeting the portal, vendor, DCR, metering and DISCOM requirements.
Is a fully off-grid solar system eligible for subsidy?
No. The residential CFA guidelines state that off-grid installations are not eligible.
Can a hybrid solar system receive PM Surya Ghar subsidy?
A grid-connected battery-hybrid or behind-the-meter system may be eligible subject to State regulatory approval and the required DISCOM inspection and protection.
Does battery capacity receive a separate subsidy?
No. CFA is calculated from eligible solar-module DC capacity, not battery storage.
Does an on-grid solar system work during a power cut?
A standard grid-tied system normally shuts down during an outage because of anti-islanding safety requirements.
Can a hybrid system run the whole home during an outage?
Only when the inverter, battery and backup wiring are sized for the complete load. Most economical designs support selected essential circuits.
What is a zero-export solar system?
It is a grid-connected system designed not to send power into the grid, typically using approved control and reverse-power protection.
Can zero-export solar receive CFA?
It may be eligible when it remains grid connected and the respective Electricity Regulatory Commission approves the arrangement.
Which system has the lowest installation cost?
A standard on-grid system usually has the lowest cost for the same solar-module capacity because it does not require a large battery bank.
Which system has the shortest payback?
On-grid frequently has the strongest bill-saving payback, but the result depends on project cost, generation, self-use and local export rules.
Is off-grid better for an area with daily power cuts?
A grid-connected hybrid system may be more practical where a grid connection exists. Fully off-grid is normally considered where grid supply is unavailable or unsuitable.
Can I add a battery to an existing on-grid system?
It may be possible, but inverter compatibility, wiring, protection, warranty and DISCOM requirements must be checked first.
How large should the battery be?
Size it from essential load watts, required backup hours, surge power, usable depth of discharge and system losses.
Does inverter capacity decide CFA?
No. CFA is calculated using eligible installed solar-module DC capacity.
Can an off-grid vendor register the system as on-grid for subsidy?
No legitimate vendor should misrepresent the configuration. DISCOM inspection, metering and portal records must match the actual installation.
Should I choose hybrid only for backup?
Choose it after valuing the backup need, battery replacement, extra maintenance, State approval and effect on payback.
Choose the Electrical Architecture Before Signing the Quotation
On-grid, grid-connected hybrid and fully off-grid systems are not interchangeable packages. Confirm whether the proposed system exports, supports outage loads, needs battery storage and qualifies under the State regulatory and DISCOM process.
Before proceeding, review the complete PM Surya Ghar guide , confirm scheme eligibility , follow the online application process , and track the final CFA payment .
Financing should be reviewed separately through the PM Surya Ghar solar-loan guide .
Official Sources
Disclaimer
Wikisia is an independent informational website and is not affiliated with the Ministry of New and Renewable Energy, PM Surya Ghar Muft Bijli Yojana, any DISCOM, regulator, bank, vendor, inverter company or battery manufacturer.
Hybrid and zero-export eligibility depends on the current State/UT regulatory and DISCOM process. System cost, backup time, battery life, generation, export value, CFA and loan terms vary. Obtain a written electrical design, current regulatory confirmation, itemised quotation and professional installation before purchasing, modifying circuits or relying on backup and savings claims.