Educational Guide
Understanding On-Grid Solar
Grid-tied solar systems are the most popular, cost-effective, and efficient way to power your home or business in Tamil Nadu. Learn how they work, the components involved, and how they virtually eliminate your electricity bills.
The Basics
What is an On-Grid System?
An on-grid (or grid-tied) solar system is directly connected to the local utility grid (TANGEDCO). It does not use expensive, maintenance-heavy batteries for storage.
Instead, it uses the electricity grid as a virtual battery. When your panels generate more power than you need, the excess is exported to the grid. When you need more power than your panels are generating (like at night), you draw from the grid.
Key Advantages
- • Lowest Setup Cost: No expensive battery banks required.
- • Highest ROI: Fastest payback period (typically 3-4 years).
- • Zero Maintenance: Without batteries, system maintenance is limited to just washing the panels.
- • Government Subsidies: Eligible for PM Surya Ghar and other state subsidies.
The Process
How It Works
The flow of electricity in a grid-tied system is seamless and completely automatic.
1. Generation
Solar panels convert sunlight into Direct Current (DC) electricity during the day.
2. Conversion
The solar inverter converts the DC electricity into grid-compliant Alternating Current (AC).
3. Consumption
The AC power flows to your distribution board, immediately powering active loads in your building.
4. Net Metering
Excess power is exported to the grid. A bi-directional meter records both imported and exported units.
Hardware Overview
Core Components
A high-quality on-grid plant consists of four primary sub-systems.
Solar PV Modules
We use Tier-1 Monocrystalline Half-Cut panels (e.g., Vikram Solar) that offer high efficiency even in low-light and high-temperature conditions.
Grid-Tied Inverter
The brain of the system. We deploy smart inverters (e.g., Growatt) equipped with MPPT technology and remote Wi-Fi monitoring capabilities.
Mounting Structure
Hot-dip galvanized steel or anodized aluminum frameworks designed to withstand cyclonic wind speeds up to 150 km/h.
Balance of System (BOS)
DC/AC cables, isolation breakers, junction boxes, lightning arresters (LA), and chemical earthing pits for total electrical safety.
Net Metering Example
Assume a billing cycle (2 months):
- Grid Import (Night time): 400 Units
- Solar Export (Day time): 350 Units
- Net Billed Units: 50 Units
*If exports exceed imports, the surplus units are carried forward to the next billing cycle.
TNEB Integration
Understanding Net Metering
Net metering is a billing mechanism that credits solar energy system owners for the electricity they add to the grid.
When your TNEB meter is replaced with a bi-directional net meter, it spins forward when you draw power from the grid and backward when you export power. You are only billed for the "net" difference.
Take the Next Step
Request a Quotation
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