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Battery + Heat Pump: The Electrification Power Duo

Heat pumps are the biggest new electric load in many homes. Pairing a battery with a heat pump shifts that load to solar and off-peak power.

WaterFuelAndSolarEnergy.com Editorial Team Updated January 2025 7 min read

Electrifying heating adds a big, steady load to your home. A heat pump, like an EV, becomes far cheaper to run when a battery lets it draw on solar or off-peak power rather than paying peak grid rates.

How they work together

  • Solar charges the battery during the day
  • The heat pump draws overnight/evening from the battery
  • A battery smooths the heat pump’s large startup draw
  • Pair with off-peak rates for even lower running cost
What size battery for a heat pump?
A heat pump can use 15–40+ kWh on a heavy heating day. A 10–13 kWh battery covers a meaningful share of daytime/evening use; whole-day coverage for big loads may need more — size from your real usage.