Introduction

Solar energy is an effective way to cut electricity costs while contributing to a sustainable future. This guide outlines the step-by-step installation process for a 3kW rooftop solar system using Vikram Solar’s Eldora Grand 1500V panels, ensuring maximum efficiency and long-term reliability.

Step 1: Site Assessment & Planning

Before proceeding with installation, it’s crucial to evaluate the site for optimal panel positioning and structural integrity.

Checklist for Site Assessment:

✅ Roof Space Required: ~18-20m²
✅ Orientation: South-facing (for India) or North-facing (Southern Hemisphere)
✅ Tilt Angle: 15°-30° for optimal solar capture
✅ Shading Analysis: Ensure no obstructions (e.g., buildings, trees) block sunlight
✅ Structural Strength: Confirm roof can support the panel weight of ~20.7kg per panel

Step 2: Selecting Components

1. Solar Panels

• Model: Eldora Grand 1500V
• Power Output: 325W – 330W
• Number of Panels: 9-10 panels required for a 3kW system
• Efficiency: 16.75% – 17.01%
• Technology: 72-cell Polycrystalline, 5BB Solar Cells
• Durability: Wind Load – 2400Pa, Snow Load – 5400Pa

2. Inverter Selection

A 3kW MPPT inverter is essential for converting DC to AC power.

• Recommended Models:
  • Fronius Primo 3.0-1
  • SMA Sunny Boy 3.0
  • Growatt 3000TL-X
  • Sungrow SG3K-S
• Input Voltage Range: 200-500V DC

3. Mounting Structure

• Material: Galvanized Steel / Aluminum
• Types: Fixed-tilt or adjustable-tilt for better efficiency
• Spacing Between Panels: ~50cm to prevent shading

4. Wiring & Protection Devices

• DC Cable: 4mm² – 6mm² PV-rated copper cable
• AC Cable: 4mm² – 6mm² copper wire
• DC Isolator: 1000V, 16A
• AC Isolator: 230V, 16A
• Surge Protection Devices (SPD):
  • DC: 600V-1500V
  • AC: 230V-415V
• Earthing Kit: 6mm² copper grounding wire

5. Net Metering System

A bi-directional net meter allows monitoring of exported and imported energy from the grid.

Step 3: Installation Process

1. Mounting the Solar Panels

🔹 Secure the mounting rails on the rooftop.
🔹 Adjust the tilt angle for optimum sun exposure.
🔹 Fix the solar panels using clamps and ensure firm positioning.

2. Connecting the Panels (DC Wiring)

🔹 Series or Parallel Configuration:

• Series: Higher voltage, lower current
• Parallel: Higher current, lower voltage 🔹 Use MC4 connectors for secure connections. 🔹 Route DC cables to the inverter through a DC Combiner Box.

3. Connecting to the Inverter

🔹 Connect DC output from panels to the MPPT inverter. 🔹 Ensure correct polarity to prevent damage. 🔹 Connect AC output from the inverter to the AC isolator.

4. AC Wiring & Grid Connection

🔹 Connect AC output → Main Distribution Board (DB). 🔹 Install AC Surge Protection Device (SPD). 🔹 Link Net Meter → Grid Connection. 🔹 Set up a separate circuit for home loads.

5. Earthing & Safety Measures

🔹 Connect all panels, inverter, and mounting structure to an earthing rod. 🔹 Install a Lightning Arrestor (if required). 🔹 Ensure grounding resistance is <5 ohms for optimal safety.

Step 4: System Testing & Commissioning

Testing the Solar System

✅ DC Voltage Check: Verify solar panel voltage before connecting to the inverter.
✅ Inverter Configuration: Adjust MPPT tracking, voltage limits, and settings.
✅ AC Load Testing: Ensure proper power conversion and grid synchronization.
✅ Net Metering Approval: Submit system details to DISCOM for inspection.
✅ Turn On the System: Activate both DC and AC connections.

Step 5: Monitoring & Maintenance

Monitoring the Solar System

• Real-time tracking: Use Fronius Solar.web, SMA Sunny Portal, or Growatt App
• Energy Data: Review net metering reports monthly.

Maintenance Routine

• Monthly: Clean panels to remove dust accumulation.
• Quarterly: Inspect for loose wires or inverter faults.
• Yearly: Perform an in-depth performance audit.

Step 6: Cost Breakdown

Final Thoughts

Installing a 3kW rooftop solar system using Eldora Grand 1500V panels is a smart investment that ensures long-term savings and a cleaner environment. By following this guide, you can successfully install, test, and maintain your solar power system with ease.

Need Help with Your Solar Installation?

💡 Looking for a customized solar plan? Drop your questions in the comments or reach out! 🚀