The package includes a new sub-board with the necessary re-wiring of the critical load to the EPS output of the inverter for power during outages.

Critical Load Sub-Board for Backup Power

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

A critical load sub-board (also known as a critical load panel) is a dedicated electrical panel that supplies power only to your essential circuits during an outage. Instead of backing up your entire property, it prioritises vital appliances such as refrigerators, lighting, Wi-Fi, medical equipment, and communication devices, making your backup power system more efficient and cost-effective.

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How EPS Setup Works with a Critical Load Sub-Board

• Separate Critical Load Panel Installation – Essential circuits are transferred from your main consumer unit to a dedicated critical load panel, ensuring backup power is directed only where needed.

• Power Source Switching – A manual or automatic transfer switch (ATS) controls the supply. In normal operation, the panel runs from the grid. During a power cut, it disconnects from the grid and connects to your battery inverter or generator.

• Battery & Inverter Integration – Solar batteries store energy and the inverter converts DC to AC power, supplying only the critical load panel during an outage. Batteries recharge from solar panels, the grid, or a generator.

• Load and System Sizing – You select which circuits are critical based on the battery and inverter capacity. Typical loads include refrigeration, Wi-Fi, lighting, and medical devices. This targeted setup reduces battery size and cost compared to whole-home backup.

• Smart Load Control (Optional) – Advanced systems may include smart load panels (e.g., Span, Lumin) for real-time monitoring and control, allowing you to manage loads directly from your phone or computer.

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Advantages of a Critical Load Sub-Board

• Cost Efficiency – Only powers essential circuits, reducing battery and inverter size requirements.

• Longer Battery Runtime – Fewer loads mean extended backup duration.

• Simplified Installation – Clear separation of critical loads makes system design and operation easier.

• Seamless Power Transfer – Automatic transfer switches ensure safe and quick switching during outages.

• Future Expandability – Easily upgrade by adding more circuits or expanding storage capacity.