How to Save Energy

Solar Photovoltaic

Solar Photovoltaic (PV) panels convert energy from the sun into electricity. Typically installed on the roof of your home, PV generates your own renewable electricity to power your home. For most homes, it is only feasible to install solar panels where there is enough roof space available. 

An unshaded, south facing roof is ideal for maximum output from your panels, however east or west facing roofs could also be considered (but will typically yield around 15-20% less energy). Solar PV can be fitted on flat roofs; however, they will usually need to be mounted inside frames which allow them to be angled correctly. 

When installing your Solar PV, it is also worth discussing the option of installing a PV diverter with your installer. When your panels generate excess electricity above your own demand, this electricity is typically sent back to the grid (through the Smart Export Guarantee, explained here ). A PV diverter switch can send this electricity to power the immersion heater in your hot water tank to use later. This could mean that the amount of energy you need to meet your hot water demands reduces. 

It is important to make sure the roof structure of your building is in good condition and can sufficiently support any additional weight from the installation of a solar panel system. Your installer will need to survey your property to check the suitability of the roof structure and works may be required to upgrade the structure prior to installation. You can lower the cost of installation costs if you already have scaffolding up for roof repairs or if you’re building a new house.

Battery Storage

Domestic batteries are typically used alongside solar PV panels. If you can store electricity throughout the day when the sun is shining, you can then use this electricity at night when the solar PV panels are not generating any electricity. 

A domestic battery can also be used to store electricity bought from the grid at cheaper times of the day (depending on your tariff). This can reduce the amount of electricity you require at peak times and therefore lower your energy bills. 

As the purchase cost of domestic batteries is still very high, it is worth weighing up whether this is the best option for the budget you have available after you have reduced the energy demand from your home. Ask an installer to explain the lifespan and cost savings from a domestic battery based on energy consumption in your home. 

Solar Thermal Panels

Solar thermal panels use energy from the sun to warm water for storage in a water cylinder. Solar thermal systems use panels which are made up of a series of tubes which contain a mix of water and glycol. This fluid is pumped around a circuit which passes through your hot water cylinder, passing on any heat gains gathered from the sun into the water cylinder. Solar thermal systems won’t provide all of the hot water demand required throughout the year; however, they do increase the base temperature of the water - a conventional boiler or immersion heater is typically used to make up the difference in temperature.

You can find out more about solar panels on the Energy Saving Trust's website.

Kingston Retrofit Guidance for Households

To read more information about all these measures, Kingston Council has developed a Retrofit Guidance for Households to provide information on energy efficiency improvements which can help to reduce energy bills.