Critical Load Sub-Board – Reliable Backup Power for Essential Circuits

Ensure uninterrupted power to your most important household appliances and devices during outages with a Critical Load Sub-Board. This package includes a new sub-board with all necessary re-wiring of critical circuits to the EPS (Emergency Power Supply) output of your inverter, keeping essential systems running when the grid goes down.

Please note: This product is only available to purchase together with our installed systems.

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What is a Critical Load Sub-Board?

A critical load sub-board (or panel) is a dedicated electrical panel installed downstream from your main consumer unit. It contains only the essential circuits you want to keep powered during a blackout.

Typical critical loads include:

• Refrigerators & freezers

• Medical equipment

• Lighting circuits

• Wi-Fi & communication devices

• HVAC fans or other essential appliances

By isolating and prioritising these circuits, you can maximise battery efficiency without needing to back up your entire home.

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How the EPS Setup Works

🔌 Separate Critical Load Panel Installation

• Critical load breakers are transferred from the main panel to the new sub-board.

• Ensures backup power is focused only on essential circuits.

⚡ Automatic or Manual Power Source Switching

• Equipped with a transfer switch (ATS).

• During normal operation, power flows from the grid.

• In a power cut, the switch automatically transfers to the inverter/battery supply.

🔋 Battery & Inverter Integration

• Batteries store energy, while the inverter supplies AC power to the sub-board.

• Critical loads are seamlessly powered during outages.

📊 Load & System Sizing

• Circuits are selected based on your inverter and battery capacity.

• Prioritises energy efficiency and backup duration.

📱 Smart Load Control (Optional)

• Advanced systems allow real-time monitoring and control of each circuit from your phone.

• Manage loads flexibly during outages.

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Advantages of a Critical Load Sub-Board

• 💰 Cost Efficiency – Reduces need for larger, more expensive batteries.

• ⏳ Longer Backup Runtime – Only powers selected essential circuits.

• 🔧 Simplified Installation – Easy to manage and expand.

• ⚡ Seamless Transfer – Quick, safe switch to backup power during outages.

• 🔄 Future-Proof – Add more critical loads or expand storage later.

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Why Choose a Critical Load Sub-Board?

Installing a dedicated sub-board for critical loads ensures peace of mind, knowing your most important devices remain powered when you need them most. Whether for homeowners, businesses, or medical reliance, it provides a smart, efficient, and scalable backup solution.