Quick Answer
During extended outages, critical backup loads include refrigeration, medical equipment, and communication devices to ensure basic needs and safety are met. These loads require a stable and reliable power source. A whole home battery backup system can provide this stability.
Critical Loads and Prioritization
When designing a backup system, it’s essential to prioritize critical loads based on their importance and the potential consequences of power loss. Refrigeration and medical equipment are often at the top of the list, as they require a stable power supply to maintain food safety and patient care. Communication devices such as cell phones and internet routers are also critical for emergency communication and remote work.
Automatic Transfer Switching
Automatic transfer switching (ATS) is a key component in ensuring a seamless transition between grid power and backup power. An ATS monitors the grid power availability and automatically switches to the backup power source when the grid goes down. This ensures that critical loads are always powered, even during extended outages. For example, a Powerwall Enphase EG4 can be paired with an ATS to provide backup power for a whole home.
System Design and Sizing
To ensure that critical loads are met during extended outages, it’s crucial to properly design and size the backup system. This includes calculating the total backup power requirements, selecting the right battery bank and inverter, and configuring the system settings for optimal performance. For instance, a typical 10-kW whole home battery backup system may require a 24-kWh battery bank, with the capacity to charge and discharge at a rate of 1-2 kW per hour.
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