Power storage battery for home
Domestic battery storage is a rapidly evolving technology that is typically used alongside solar PV. (It can also be used with a domestic wi...
Domestic battery storage is a rapidly evolving technology that is typically used alongside solar PV. (It can also be used with a domestic wind turbine, but we’re focusing on solar in this guide.) It allows surplus electricity generated by solar panels to be stored for later use rather than exported to the National Grid.
If you have solar PV you can generate plenty of electricity when the sun is shining. But on overcast days you’ll make less, and you’ll make none at all at night. This generation pattern often doesn’t match up with when households want to use electricity - it’s at night when you want the lights on and to use appliances like a dishwasher or TV.
If your solar panels generate electricity and you don’t use it, it ends up being fed into the National Grid. You may get paid for it, but not as much as you save if you use the power yourself.
This is where battery storage comes in. If you can store the electricity generated during the day, there is less need to consume electricity – e.g. run your washing machine – when the sun is shining and you’ll use more of the power you generate and save money.
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In addition, some batteries can now export and import electricity directly into the grid, helping to balance national demand and supply issues, and also reducing carbon emissions at peak times. New methods to engage in energy trading are emerging, like selling electricity locally to neighbours or to a micro grid, or being part of an international ‘battery community’.
Is battery storage for me?
If you are a low electricity user and expect to recoup an investment quickly, battery storage probably isn’t for you. But it might be something to explore in more depth if:
- You want to maximise your self-generated electricity but can’t adapt household behaviour to achieve this. (i.e. you can’t use most of your electricity during the day, or produce significantly more electricity than you use).
- You want to play a proactive role in the future energy system and reduce carbon emissions.
- You want to be off grid or as energy self-sufficient as possible.
To assess the financial investment, you will need to know your annual household electricity usage, and the annual generation capacity - actual or expected - of your solar panels. Next you’ll need to consider likely installation costs based on the type of battery you want, and also any potential export payments.
What to look for ...
First off, the battery itself. Once you know your electricity usage and generation capacity you can think about the types of battery storage system that suits you. The points below are designed to help you do this.
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It’s worth bearing in mind that battery storage is developing fast. By 2022 storage capacity in the UK (domestic and non-domestic) is expected to be 50 times what is was just two years ago, and such growth is likely to bring down the costs. Plus the technology itself - and associated services - is changing too, becoming more sophisticated and offering more options to those seeking to become more actively engaged in an increasingly decentralised electricity network.
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