An on-grid solar system generates electricity from rooftop solar panels while remaining connected to the electricity distribution grid. For many households and businesses, it is an effective way to reduce electricity purchased from the utility. Net metering, where applicable under current rules, accounts for electricity imported from and exported to the grid.
What Is an On-Grid Solar System?
An on-grid or grid-connected solar photovoltaic (PV) system consists of rooftop solar panels, a grid-tied inverter, electrical protection equipment and a utility connection. Solar panels produce DC electricity, which the inverter converts into AC electricity for household or commercial loads.
When solar generation is less than your demand, the grid supplies the difference. When generation exceeds your immediate demand, eligible systems may export surplus electricity to the grid, subject to approved interconnection and metering arrangements.
Unlike a battery-backed hybrid system, a standard on-grid system normally shuts down during a power outage for safety. It does not provide backup power simply because sunlight is available.
How On-Grid Solar and Net Metering Work
- Solar generation: Rooftop panels convert sunlight into DC power.
- Power conversion: The inverter converts DC into grid-compatible AC electricity.
- Self-consumption: Appliances use available solar energy first, according to the installation's electrical configuration.
- Grid import: If demand exceeds solar generation, electricity is drawn from the grid.
- Grid export: Excess solar electricity can flow to the grid if export is permitted and the installation is approved.
- Metering and billing: The utility measures import and export and applies the relevant billing or settlement mechanism.
Benefits of On-Grid Solar in Kerala
- Lower grid purchases: Daytime solar production can offset part of your electricity consumption.
- No battery required: Standard on-grid systems avoid the initial cost and maintenance considerations of battery storage.
- Suitable for different properties: Homes, offices, shops and commercial buildings may benefit when the roof and electrical connection are suitable.
- Monitoring: Many inverters provide generation and performance information through a display or mobile application.
- Long-term planning: A properly sized system can help manage future electricity expenses, although savings depend on consumption, tariff, system output and rules.
Net Metering in Kerala: What You Need to Know
Net metering is a billing arrangement that accounts for electricity imported from the grid and surplus solar electricity exported to it. The exact method of crediting exports, carry-forward treatment, billing period and settlement may change under regulatory orders.
Before installing rooftop solar, ask the installer to verify the current KSEB application procedure, approved system capacity, applicable metering arrangement, required documents, inspection process and any charges.
For current official information, consult KSEB and the Kerala State Electricity Regulatory Commission.
On-Grid Solar Installation Process
- Electricity-bill assessment: Review recent bills and consumption patterns.
- Roof survey: Check usable space, shading, structural suitability and access.
- System design: Select panel capacity, inverter rating, mounting arrangement and safety components.
- Utility application: Complete the current approval process as applicable.
- Installation: Fit the mounting structure, panels, inverter, cabling and protective devices.
- Inspection and metering: Complete required testing, inspection and meter arrangements.
- Commissioning: Verify safe operation, monitoring and handover documentation.
Read our related guide: KSEB Net Metering: Complete Step-by-Step Process.
Choosing the Right Solar System Size
The appropriate system size depends on electricity consumption, roof area, shading, sanctioned load, available budget and applicable interconnection rules. A system should not be sized using the electricity bill alone; the timing of daytime use also matters.
| Assessment | Why It Matters |
|---|---|
| Monthly electricity use (kWh) | Helps estimate required annual generation |
| Daytime consumption | Influences how much solar electricity is used directly |
| Usable roof area and shading | Limits practical panel capacity and output |
| Roof structure and orientation | Affects installation method and generation |
| Utility rules and connection | Determines applicable approvals and metering arrangements |
Explore our Solar Panel Cost in Kerala guide for the factors that influence installation budgets.
On-Grid Solar vs Hybrid Solar
| Feature | On-Grid Solar | Hybrid Solar |
|---|---|---|
| Grid connection | Yes | Usually yes |
| Battery storage | Not normally included | Typically included |
| Power during outages | Normally no | Possible for configured backup loads |
| Upfront cost | Generally lower without batteries | Generally higher with storage |
| Best fit | Reducing grid electricity purchases | Solar generation plus backup requirements |
Learn more about Hybrid vs On-Grid Solar and Hybrid Solar with Battery Backup.
Are Government Solar Subsidies Available?
Eligible residential consumers may be able to apply for rooftop solar support through the PM Surya Ghar programme, subject to the scheme's current conditions, technical requirements and approval process. Subsidies should never be assumed to apply automatically to every property or system type. Check the official portal and utility guidance for current eligibility and amounts.
Why Choose B&B Green Energy?
B&B Green Energy helps customers plan rooftop solar installations around their actual electricity needs, site conditions and system goals. Our approach emphasizes suitable system sizing, installation planning and guidance through the relevant process.
Whether you are considering solar panels for your home or exploring a commercial rooftop system, start with a proper site assessment and a clear itemized proposal.
Frequently Asked Questions
Does an on-grid solar system work during a power cut?
A conventional grid-tied solar inverter normally shuts down when the grid fails. Backup requires suitable additional equipment and wiring.
Does net metering mean my electricity bill will be zero?
Not necessarily. Your bill depends on imports, exports, tariffs, fixed charges, applicable fees and the current settlement rules.
Can I install on-grid solar without a battery?
Yes. Standard on-grid systems are designed to operate without battery storage while the utility grid is available.
How much roof space is required?
It depends on the panel dimensions, layout, shading, setbacks and roof conditions. A site survey is the best way to establish usable capacity.
Who handles net metering approval in Kerala?
Applications and interconnection arrangements involve the relevant distribution utility, commonly KSEB in its service area, under applicable regulations.
Is on-grid solar suitable for a business?
It can be, especially where electricity use aligns with daytime generation. A business-specific financial and technical assessment is recommended.
Plan Your On-Grid Solar Installation with B&B Green Energy
Share your latest electricity bill, property location and roof details. Our team can help you discuss a suitable rooftop solar system and the next steps.
Get a Free Solar Quote →Information is general and does not replace current utility regulations or a site-specific technical assessment. Verify all approvals, incentives and billing terms before installation.