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How to Connect Inverter to Distribution Board


How to Connect Inverter to Distribution Board with Battery

Introduction to Automatic Inverter / UPS Wiring

Power failures and emergency breakdowns can occur at any time, leading to disruptions in electric supply. In critical situations such as hospitals, military installations, intelligence systems, and offices, restoring power promptly is essential. To address these challenges, generators and Inverter/UPS (Uninterruptible Power Supply) systems come into play, utilizing backup batteries and inverters.

This article focuses on the process of connecting an inverter to a distribution board, ensuring a seamless power supply during outages or in off-grid situations. We’ll cover the necessary steps, considerations, and troubleshooting tips to empower readers to make this connection with confidence.

Why & Where we Need Auto UPS / Inverter System?

Power outages can result from various reasons, including short circuits, damage to electric transmission lines, storms, or adverse weather conditions. In critical scenarios like hospitals’ ICUs, military installations, and security systems, an uninterrupted power supply is crucial. In everyday situations, facing load-shedding, unavailability of secondary power sources, or low voltage issues, having an automatic UPS/Inverter wiring connection becomes vital for homes, offices, PCs, or specific rooms and load points.

How to Connect a UPS / Inverter to the Home Supply System

Disconnecting Live Wires from the Main Distribution Board

  1. Begin by disconnecting the live wires of specific rooms from the main distribution board.
  2. Connect these live wires to the output of the UPS through two single-pole MCBs, separated from the main panel board.

Note: Only the connected MCBs and their related load will receive continuous power during a blackout. To charge the battery via the inverter, connect it to the main double pole MCB through a 3 Pin Power Plug and 3 Pin Power socket.

Wiring Color Code

Ensure proper wiring color codes are followed, with red for live or phase, black for neutral, and green for the earth wire in a single-phase system. Adhering to specific area codes, such as IEC or NEC, is essential for safety and compliance.

Working Principle & Operation of Automatic UPS / Inverter

  1. When utility power supply is not available:
    • Power flows to specific rooms, offices, and appliances connected to the UPS system and battery.
    • The inverter converts 12V DC to Single Phase 230V AC (UK & EU) or 120V AC (US & Canada) according to specifications.
  2. When power supply restores from the power house:
    • Main electric lines supply power to home appliances in connected rooms.
    • The UPS/Inverter starts to charge the battery by converting main Single Phase AC voltages into 12V DC.

Factors to Consider Before Connecting an Inverter to a DB Board

Assess the Power Requirements

  • Identify the appliances you want to power using the inverter.
  • Calculate the total power consumption to match with or exceed the inverter’s capacity.

Understand the Inverter Specifications

  • Pay attention to input and output voltage ratings.
  • Ensure compatibility with the grid and connected devices.
  • Consider efficiency and additional features like surge protection.

Evaluate the DB Board Capacity

  • Ensure the DB board has sufficient space for inverter components.
  • Check available slots for circuit breakers and assess capacity.
  • Follow safety regulations and standards during installation.

Safety Considerations

  • Install manual cut-over switches and fuse boxes for protection.
  • Proper grounding is crucial for safe operation.
  • Adhere to safety regulations and standards.
  1. Manual Cut-Over Switches:
    • Facilitate switching between grid power and inverter power.
  2. Fuse Boxes:
    • Protect electrical circuits from overloading and short circuits.
  3. Surge Protection Devices:
    • Safeguard equipment from power surges and voltage spikes.
  4. Separate Circuit Breakers for Input and Output:
    • Ensure safety by using separate breakers for inverter input and output.
  5. Battery Fuses:
    • Protect batteries from excessive current flow.
  6. Compliance with SANS Specifications:
    • Adhere to South African National Standards for safety and reliability.

Step-by-Step Guide to Connecting an Inverter to a DB Board

Preparing the DB board

  1. Turn off the main power supply.
  2. Identify a suitable location for inverter components.
  3. Ensure sufficient space and capacity.

Installing manual cut-over switches and fuse boxes

  1. Choose appropriate switches and boxes.
  2. Install switches securely on the DB board.
  3. Connect input and output wires to the inverter.
  4. Install fuse boxes according to manufacturer’s instructions.
  5. Connect fuses for additional protection.

Wiring the inverter to the DB board

  1. Refer to the manufacturer’s instructions or wiring diagram.
  2. Identify and connect wires to the inverter terminals.
  3. Ensure secure and tight connections.

Connecting the batteries

  1. Follow manufacturer’s instructions for battery connection.
  2. Connect positive and negative terminals securely.

Ensuring proper grounding

  1. Consult a qualified electrician for appropriate grounding methods.
  2. Install a grounding rod or use an existing grounding point.

Testing the system

  1. Turn on the main power supply.
  2. Switch on the inverter and verify power supply from batteries.
  3. Check DB board for connected loads receiving power.
  4. Test switches, fuse boxes, and monitor for abnormalities.

Common Challenges While Connecting Inverter to Distribution Board

Identifying and Resolving Wiring Issues

  • Double-check connections for security.
  • Inspect wiring for damage or loose connections.
  • Use a multimeter for continuity testing.
  • Consult user manuals or professionals if unsure.

Dealing with Compatibility Problems

  • Ensure inverter compatibility with the DB board and electrical system.
  • Check voltage and frequency requirements.
  • Consult manufacturers for compatibility guidelines.

Troubleshooting Common Errors

  • Check power supply if the inverter is not turning on.
  • Inspect battery connections for insufficient power.
  • Address excessive heat or unusual noises promptly.
  • Reduce load or consult an electrician for circuit breaker trips.

Seeking Professional Assistance When Needed

  • Consult an electrician for complex wiring or compatibility issues.
  • Seek professional help if unsure or uncomfortable with the installation process.


Connecting an inverter to a distribution board is a significant step towards ensuring a reliable power supply during outages or in off-grid scenarios. By following the proper steps, considering essential factors, and using recommended components, individuals can successfully make this connection themselves. However, safety should always be a priority, and seeking professional assistance is advisable in case of uncertainty or complexity.

FAQ Section

How to Connect Inverter to Distribution Board with Battery

To connect an inverter to a distribution board with a battery, follow these steps:

  1. Assess Power Requirements:
    • Identify appliances to power and calculate total consumption.
  2. Understand Inverter Specifications:
    • Pay attention to input/output voltage and efficiency.
  3. Evaluate DB Board Capacity:
    • Ensure sufficient space and assess available slots.
  4. Safety Considerations:
    • Install cut-over switches and fuse boxes for protection.
  5. Recommended Components:
    • Use manual cut-over switches, fuse boxes, surge protection devices, separate circuit breakers, and battery fuses.
  6. Step-by-Step Connection:
    • Prepare the DB board, install switches and boxes, wire the inverter, connect batteries, ensure proper grounding, and test the system.
  7. Troubleshooting Tips:
    • Address wiring, compatibility, and common errors.
  8. Professional Assistance:
    • Seek help if unsure or uncomfortable.

How to Connect Inverter to Distribution Board PDF

For a detailed guide on connecting an inverter to a distribution board with a battery, download this webpage as our PDF guide. It provides step-by-step instructions, safety considerations, recommended components, troubleshooting tips, and professional assistance guidelines.

How to Connect Inverter to Main Line

Connecting an inverter to the main line involves:

  1. Disconnecting Live Wires:
    • Disconnect live wires from specific rooms.
  2. Connecting to UPS:
    • Connect live wires to UPS output through MCBs.
  3. Charging the Battery:
    • Connect the UPS to the main double pole MCB for battery charging.
  4. Wiring Color Code:
    • Use red for live, black for neutral, and green for earth wire.
  5. Working Principle:
    • Understand the inverter’s operation during power outage and restoration.

Inverter Wiring in Board

Inverter wiring in a board involves:

  1. Installing Components:
    • Install manual cut-over switches, fuse boxes, and surge protection devices.
  2. Wiring Connection:
    • Follow the inverter’s wiring diagram for proper connections.
  3. Battery Connection:
    • Connect batteries to the inverter securely.
  4. Grounding:
    • Ensure proper grounding for safe operation.
  5. Testing:
    • Test the system for functionality and address any issues.

How to Connect Inverter to Battery?

Connecting an inverter to a battery involves:

  1. Understanding Battery Connection:
    • Refer to the inverter’s manual for the correct procedure.
  2. Identifying Battery Terminals:
    • Connect positive and negative terminals securely.
  3. Securing Connections:
    • Ensure all battery connections are tight for safety.
  4. Testing:
    • Test the system to verify proper battery functionality.

Do We Need Separate Wiring for Inverter?

Yes, separate wiring for the inverter is necessary to ensure a proper and safe connection. This includes:

  1. Separate Circuit Breakers:
    • Use separate circuit breakers for the inverter input and output to prevent overload.
  2. Compliance with Standards:
    • Adhere to safety standards and regulations for electrical installations.
  3. Proper Grounding:
    • Ensure the inverter is properly grounded for safe operation.

How Do I Put My Inverter to Mains?

To put your inverter to mains, follow these steps:

  1. Turn On Main Power Supply:
    • Turn on the main power supply to the distribution board.
  2. Switch On the Inverter:
    • Switch on the inverter to receive power from the batteries.
  3. Verify Power Supply:
    • Check the distribution board to ensure connected loads are receiving power from the inverter.
  4. Test the System:
    • Test manual cut-over switches and fuse boxes to ensure proper functionality.
  5. Monitor for Abnormalities:
    • Keep an eye on the system for any abnormal behavior and address issues promptly.

Where Should I Connect My Inverter?

Connect your inverter at a suitable location on the distribution board. Ensure there is enough space for components like manual cut-over switches, fuse boxes, and surge protection devices. Additionally, consider the capacity of the distribution board to accommodate the inverter and its associated components. If in doubt, consult with an electrician to assess the board’s capacity and make any necessary upgrades.

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