A heat pump raises electrical demand, making tariff design and battery sizing more important.
The Short Answer
A battery can help shift part of a heat pump household’s consumption, but the heat pump may use more energy than the battery can reasonably supply. The aim is to reduce expensive imports, not to run all heating from the battery.
Heat pumps change the load profile
Space and water heating can create sustained electrical demand, particularly in colder weather when solar generation is also lower.
Battery size has limits
A typical home battery may only cover a portion of daily heat-pump demand. Oversizing storage solely to run heating can produce poor utilisation in milder months.
Use cheap periods strategically
A smart tariff can support both thermal and electrical storage. Some heat can be produced during lower-cost periods while the battery is also charged for later household loads.
Winter deserves its own settings
Cold weather increases heating demand and reduces solar output. Battery reserve, grid-charge targets and tariff schedules should reflect that seasonal change.
Key Takeaway
Battery economics depend on the complete energy flow: what electricity costs when you charge, what it would cost when you discharge, what solar export is worth, and how efficiently the battery is used.
Frequently Asked Questions
Can a battery run a heat pump?
It can supply household circuits including a heat pump where electrically configured to do so, but the high sustained load can drain a residential battery quickly.
Should I size the battery for the heat pump peak?
Usually the better approach is to model the full daily load profile and tariff rather than one peak appliance rating.
Can pre-heating help?
Potentially. Using lower-cost periods to pre-heat water or the building can reduce demand in expensive periods, subject to comfort and controls.
Assess Heat Pump + Battery Use
Model winter consumption and tariff periods before increasing battery capacity.
Tariffs, supplier terms and export payments change. Check the current plan details before making a purchasing or settings decision.