Advancing a zero-carbon footprint house.
Solar Heat Pump Energy Management System for a Low-Carbon Home
As homeowners seek to improve energy efficiency and reduce their carbon footprint, many are integrating renewable energy technologies into a single smart home energy system. Combining an air-to-water heat pump, a hot water tank and an Energy Storage System (ESS) battery with an existing solar photovoltaic (PV) system creates an efficient and environmentally responsible solution.
This integrated solar heat pump energy management system, also known as an EMS (Energy Management System), coordinates energy generation, storage and consumption throughout the home. It can help reduce electricity costs, increase the use of renewable energy and provide households with greater energy independence.
Using Solar Energy Throughout the Home
During daylight hours, solar PV panels convert sunlight into clean, renewable electricity. This electricity can power household appliances, including the dishwasher, oven, heat pump and electric vehicle charger.
When solar electricity production exceeds immediate household demand, the surplus energy does not need to be wasted. Depending on the system configuration, it can be:
- Stored in an ESS battery for later use
- Used by the heat pump to produce heating or domestic hot water
- Stored as thermal energy in a hot water tank
- Supplied to an electric vehicle charger
- Exported to the electricity grid, subject to local regulations and tariffs
By managing these different energy flows, the EMS helps the household maximise self-consumption of locally generated solar electricity.
Integrating a Heat Pump and Water Tank
The integration of a heat pump and hot water tank plays an important role in the system. An air-to-water heat pump extracts thermal energy from the outdoor air and transfers it to the home’s water-based heating system. This energy can be used for space heating and domestic hot water production.
When surplus solar electricity is available, the EMS can operate the heat pump and store the resulting thermal energy as hot water. Instead of exporting all excess electricity immediately, the household can use part of it to meet future heating and hot water demand.
This makes the water tank a practical form of thermal energy storage and helps increase the amount of solar energy used directly within the home.
Using Stored Energy After Sunset
Once the sun sets and the solar panels stop generating electricity, the home can use the energy stored during the day. Hot water stored in the tank can support domestic hot water requirements and, where the system is designed accordingly, space heating.
For example, a suitable system may heat a 300-litre water tank to a specified temperature during periods of high solar production. The available storage temperature and volume must always be configured according to household demand, system design, safety requirements and manufacturer recommendations.
At the same time, electricity stored in the ESS battery can power household appliances, operate the heat pump or support electric vehicle charging when solar generation is unavailable.
Reducing Grid Reliance and Energy Costs
A solar heat pump energy management system enables homeowners to use renewable electricity more strategically. By deciding when to operate the heat pump, charge the battery, heat the water tank or export electricity, the EMS can reduce unnecessary grid consumption.
Where permitted by the local electricity market, surplus solar electricity may also be exported to the grid. This allows the household to become both an energy consumer and a small-scale energy producer.
Actual savings and export opportunities depend on electricity prices, tariffs, local regulations, system size and household consumption patterns.
Towards a More Energy-Independent Home
Integrating solar PV panels, an air-to-water heat pump, a hot water tank and an ESS battery through an EMS can help homeowners:
- Increase solar self-consumption
- Reduce reliance on non-renewable energy
- Lower household carbon emissions
- Improve energy independence
- Reduce electricity and heating costs
- Use stored energy when solar generation is low
Tongyi’s solar heat pump energy management system brings these technologies together to support more intelligent and efficient household energy use. By coordinating renewable generation, heating and energy storage, the EMS provides a practical route towards a more sustainable, flexible and low-carbon home.
