How to Reduce Winter Heating Costs with Solar Energy, Home Batteries and Heat Pumps

As winter approaches and temperatures drop, household energy consumption rises: heating systems run for longer, hot water demand increases, and electricity bills can climb accordingly. For households using heat pumps, winter can be an especially energy-intensive season.

But what if more of the electricity needed for home heating could come from your own solar system?

By integrating a heat pump with a solar-plus-storage system, homeowners can make better use of available solar energy, reduce reliance on grid electricity and manage household energy consumption more intelligently.

With the Hoymiles HiOne all-in-one home energy storage system, an integrated Energy Management System (EMS) helps coordinate solar generation, battery storage and compatible heat pumps to make the most of available energy throughout the day.

Why Combine Solar Energy, Battery Storage and a Heat Pump?

Heat pumps are an energy-efficient way to heat homes. Rather than generating heat directly from electricity, they transfer heat from the outdoor air or another heat source into the home. This allows them to deliver more heat energy than the electrical energy they consume.

However, operating a heat pump still requires electricity, particularly during colder months when heating demand increases and outdoor temperatures may affect its efficiency.

Solar energy offers a way to offset part of this electricity consumption. While rooftop solar panels can generate clean electricity during the day, household heating demand does not always coincide with peak solar production. Without an effective energy management strategy, surplus solar power may be exported to the grid, while the household continues to draw electricity from the grid when the heat pump operates later.

This is where battery storage and intelligent energy management come into play.

A home battery stores surplus solar electricity for later use, while an EMS coordinates how energy is distributed among household appliances, the battery and the grid. When integrated with a compatible heat pump, the system can also use available solar energy to support home heating.

Together, these technologies help households increase solar self-consumption and make better use of their own renewable electricity, even during the heating season.

How Does HiOne Work with a Heat Pump?

The Hoymiles HiOne is an all-in-one home energy storage system designed to bring solar generation, battery storage and household energy management together.

When connected to a compatible heat pump, HiOne's EMS can coordinate the operation of the heating system with the household's overall energy status (HiBox gateway is needed for the connection of a heat pump). Rather than treating the heat pump as an independent electricity consumer, the system considers available solar generation and battery charge levels when managing energy use.

Here's how the coordination works:

1. Use surplus solar energy to power the heat pump

When solar panels generate more electricity than the household currently consumes, the EMS detects the available energy surplus. It can then automatically activate the compatible heat pump, allowing surplus solar electricity to support home heating instead of being exported to the grid.

2. Coordinate heat pump operation with battery SOC

Solar generation and household electricity demand change throughout the day. Battery State of Charge (SOC) provides an important reference for energy management.

HiOne's EMS can refer to grid power consumption and battery SOC to determine when the heat pump should start or stop. When sufficient energy is available, the system can enable heat pump operation. When battery SOC reaches the configured threshold, it can adjust or stop operation to help preserve stored energy for other household needs. 

When a short blackout occurs, the HiOne system can still sustain the heat pump thanks to its capacity to support high-power inductive loads.

This intelligent coordination helps balance heating demand with household energy availability.

3. Make better use of stored energy

When solar generation decreases, particularly in the late afternoon or evening, the battery can supply stored electricity to household loads. This gives homeowners more flexibility in using solar energy beyond daylight hours.

Why Does This Matter More in Winter?

Winter presents a different energy management challenge from summer.

Shorter daylight hours and lower solar irradiation can reduce daily PV generation, while heating demand typically increases. This makes it especially important to manage available electricity carefully.

A solar-plus-storage system with heat pump integration offers several advantages:

• More solar energy for heating: Surplus PV electricity can be directed to a compatible heat pump, helping reduce the amount of solar power exported to the grid.

• Better use of battery capacity: Intelligent SOC-based control helps coordinate heating operation with available stored energy.

• Reduced grid dependence: Using solar generation and stored electricity to support heating can lower the amount of electricity purchased from the grid.

• Smarter household energy management: Solar panels, batteries and heating equipment work together based on real-time household energy conditions.

Heat Pumps Are Not Just for Cold Climates

Heat pumps are often associated with winter heating, but their applications extend well beyond cold regions. Even in tropical and subtropical climates, where space heating is rarely needed, heat pumps can deliver significant energy savings through everyday applications.

Efficient domestic hot water production

Hot water is a year-round necessity for households, hotels, gyms and other facilities. Heat pump water heaters extract heat from the surrounding air to heat water, rather than relying entirely on direct electric heating. In warm climates, higher ambient temperatures can create favorable operating conditions, allowing heat pumps to produce hot water efficiently throughout the year.

Cooling and hot water from recovered heat

In regions where air conditioning operates for much of the year, heat recovery offers another opportunity. Instead of simply releasing the heat removed from indoor spaces into the outdoor environment, specialized heat recovery systems can capture and reuse it to produce domestic hot water or heat swimming pools. This allows cooling and water heating needs to be addressed more efficiently.

Swimming pool and spa heating

Swimming pools and spas are common in residential properties, hotels and resorts across tropical regions. Heat pumps provide an energy-efficient way to maintain comfortable water temperatures without relying solely on conventional electric resistance heating.

These applications demonstrate that heat pumps are not limited to winter heating. In warmer climates, they can serve as an efficient solution for year-round hot water and other thermal needs.

Hoymiles HiOne is now compatible with heat pumps from MyPV and Powerworld.

How European Policies Are Driving Solar, Storage and Heat Pump Integration

Across Europe, policy developments are increasingly encouraging the integration of renewable energy, home storage and intelligent energy management.

In the Netherlands, the government has put forward plans to introduce standards for smart heat pumps and EV chargers from 2029, encouraging these devices to respond to grid conditions and make better use of surplus renewable electricity.

Meanwhile, the UK's £15 billion Warm Homes Plan is supporting the wider adoption of solar panels, home batteries and heat pumps to improve residential energy efficiency and reduce household energy costs. The plan aims to help up to 5 million households out or fuel poverty by 2030.

These developments point to a broader shift in residential energy: the value of a home energy system lies not only in how much electricity it generates or stores, but also in how intelligently that energy is managed and used.

HiOne: Bringing Home Energy Management Together

A well-integrated home energy system needs more than solar panels and a battery. It also needs intelligent control to coordinate different energy sources and household loads

Hoymiles HiOne brings these functions together in an all-in-one residential energy storage solution.

With stackable 8 kWh battery capacity, a maximum system efficiency of 98.5% and an integrated EMS, HiOne helps homeowners manage solar generation, battery storage and household electricity consumption within one system.

Its energy management capabilities support coordinated operation with compatible heating equipment, helping households make better use of surplus solar energy and balance battery reserves against heating needs.

Make every unit of solar energy count. Discover how Hoymiles HiOne can help you build a smarter, more energy-efficient home.