Path-Q Solar
How should backup circuit selection change if my home has electric heating?
Answer
Electric heating should be treated as a major power and energy load, so it often requires either exclusion from backup, a separately controlled limited heating circuit, or substantially larger inverter and battery capacity. Decide first whether maintaining heat during an outage is essential and for how long.
Key points
- Heating can have high continuous demand and may operate for long periods in cold weather.
- Startup and auxiliary loads may add to the heating system's requirements.
- A small backup system may support a designated low-power heating zone or alternative heat source rather than whole-home heating.
What it depends on
- Heating type, capacity, and controls
- Climate and expected outage conditions
- Desired indoor temperature and backup duration
- Battery usable energy and inverter continuous and surge output
Risks and trade-offs
- Including heating can quickly exhaust the battery or require a much larger system.
- Excluding it may create safety or property risks in cold conditions, depending on the home and outage duration.
Information you may need
- Heating equipment nameplate and operating data
- Cold-weather load profile
- Required backup duration and minimum acceptable service
- Alternative heating and safety needs
Your next step
What to do next
Ask for a winter outage load calculation that shows heating included, excluded, and limited to a defined zone or operating mode.
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