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By 2050, nearly 50% of the electricity fed into the grid will be generated from renewable sources. However, their intermittent nature means that solutions must be found to match electricity production with demand. In this respect BESS (Battery Energy Storage Systems) are highly effective. They use batteries (mostly lithium-ion) to store energy and then release it as needed. Here are a series of answers to the main questions about these devices. Home energy storage systems store generated electricity or heat, so that you can use the energy when you need it.
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Electricity can be stored in electrical batteries, or it can be converted into heat and stored in a heat battery. Heat can also be stored in heat batteries or in thermal storage, such as a hot water cylinder.
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Energy storage can be useful for people who generate their own renewable energy, as it allows them to use more of their low carbon energy.
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For example, electricity generated during the day by solar PV panels could be stored in an electric battery for you to use for boiling the kettle or watching TV in the evening when your solar PV panels are no longer generating electricity.
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The battery size and its cost depends on your current energy use and the size of any generation technologies you have installed. You may also want to plan around future electricity use if you are intending to purchase an electric vehicle (EV) or heat your home with a heat pump. In the UK, the average cost to install a home solar battery is around £5,000, with prices varying depending on the battery's capacity, brand, and installation factors; a typical 5kWh battery for a medium-sized home would fall within this range.