Path-Q Solar
Which household circuits should be prioritized for battery backup?
Answer
Prioritize circuits needed for health, safety, water, communications, food preservation, and basic lighting, then add comfort loads only if capacity allows. Common priorities include medical equipment, refrigeration, internet or phone equipment, selected lights, a sump or well pump, security, garage access, and heating controls. The final list should reflect the home's hazards and occupants rather than a generic circuit list.
Key points
- Identify must-run loads, useful loads, and discretionary loads before sizing the system.
- Motors and compressors need starting power, so a circuit may be essential but still require special inverter capacity.
- Avoid backing up large heating, cooling, water-heating, cooking, or vehicle-charging loads unless the system is designed for them.
- A critical-load panel or load-management system can separate priority circuits from ordinary circuits.
What it depends on
- Occupant medical and accessibility needs
- Water, sewage, heating, and food-storage requirements
- Load wattage, duty cycles, and starting surges
- Battery and inverter capacity and outage duration
Risks and trade-offs
- Omitting a pump, medical device, or communications load can create safety problems.
- Including too many large loads can drain the battery quickly or overload the inverter.
- Manual load management may fail during a stressful or overnight outage.
Information you may need
- Household safety and medical requirements
- Circuit directory and measured load information
- Pump, compressor, heating, and appliance starting ratings
- Desired backup duration and automatic load-control preferences
Your next step
What to do next
Mark circuits as must-run, useful, or exclude, then have an electrician verify the circuit map and size the critical-load panel and inverter.
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SQ00815