Path-Q Solar

What appliances usually need to be excluded from a limited solar backup system?

Answer

Limited backup systems commonly exclude high-power, high-surge, heat-producing, or continuous loads unless they are specifically sized for them. Examples can include electric resistance heating, central air conditioning, electric water heating, ovens, clothes dryers, large pumps, and EV charging, but the correct decision depends on the system rating and the home's equipment.

Key points

  • Evaluate both running energy and startup surge.
  • Prioritize refrigeration, essential lighting, communications, medical equipment, and selected pumps where appropriate.
  • Use a critical-load panel or documented load controls when the system is not whole-home.
  • Do not assume an appliance is suitable merely because its average energy use is low.

What it depends on

  • Battery and inverter continuous and surge ratings
  • Appliance nameplate and startup requirements
  • Desired runtime
  • Backup wiring and load-control design

Risks and trade-offs

  • Excluding too few loads can overload the inverter or shorten runtime.
  • Excluding heating, cooling, pumps, or medical equipment may create safety or habitability concerns.
  • Automatic load shedding can improve coverage but adds equipment and complexity.

Information you may need

  • Whole-home appliance list
  • Running and startup power data
  • Critical-load priorities
  • Proposed backed-up circuits

Your next step

What to do next

Have the installer produce a circuit-by-circuit backup schedule and explain which loads are excluded and why.

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