Achieving Energy Independence: The Critical Role of Solar Battery Storage

Evolve Renewables - Solar Baterry Storage

In an era where energy independence and sustainability are becoming increasingly important, the role of solar battery storage cannot be overstated. As we move towards a future powered by renewable energy, understanding how solar photovoltaic (PV) systems and battery storage work together is crucial.

This comprehensive guide will walk you through everything you need to know about solar battery storage, from the basics of how it works to the installation process and the benefits you can expect.

Why Solar Battery Storage?

Solar battery storage is a game-changer in the renewable energy sector. It allows homeowners and businesses to store excess solar energy generated during the day and use it when the sun isn’t shining, such as during the night or on cloudy days. This not only maximises the use of renewable energy but also provides a reliable backup power source.

Benefits of Solar Battery Storage


  1. Energy Independence

    With a solar battery system, you are less dependent on the grid, which can be particularly beneficial during power outages or in areas with unreliable electricity supply. When you have your own battery storage, you have the peace of mind that comes from knowing that your home or business will have power even when the grid goes down. This is especially crucial in regions prone to blackouts or natural disasters. Moreover, energy independence also shields you from rising electricity prices and fluctuations in energy supply.

  2. Cost Savings

    By storing and using your solar energy, you can reduce your electricity bills. You can also take advantage of time-of-use rates by using stored energy during peak hours when electricity prices are higher. Over time, these savings can add up significantly. For instance, homes with solar battery storage can save an average of 15-20% on their electricity bills annually.

    The upfront investment in solar battery storage can be offset by various government incentives and rebates aimed at promoting renewable energy adoption.

  3. Environmental Impact

    Solar battery storage reduces reliance on fossil fuels, contributing to lower greenhouse gas emissions and a smaller carbon footprint. By using clean, renewable energy stored in batteries, you are directly reducing the amount of CO2 and other harmful emissions released into the atmosphere.

    Battery storage can reduce a household’s carbon emissions by up to 30%, making it a vital component in the fight against climate change. This also aligns with global efforts to transition to a more sustainable and eco-friendly energy infrastructure.

  4. Grid Stabilisation

    By using stored energy, you can help stabilise the grid by reducing demand during peak times. This is particularly important as more renewable energy sources are integrated into the grid, which can sometimes be intermittent. By smoothing out demand and supply fluctuations, battery storage helps in maintaining a stable and reliable electricity grid. This not only benefits you but also contributes to the overall efficiency and resilience of the energy system.

How Solar Battery Storage Works

Understanding the mechanics of solar battery storage can help you appreciate its value and operation. Here’s a detailed look at how it works.

Components of a Solar Battery Storage System


  1. Solar Panels

    These are the primary components that capture sunlight and convert it into electricity. Made from semiconductor materials, typically silicon, solar panels use the photovoltaic effect to generate direct current (DC) electricity from sunlight.

  2. Inverter

    Since most home appliances run on alternating current (AC), the inverter’s job is to convert the DC electricity generated by the solar panels into AC electricity . This conversion is essential for the efficient operation of household and business electrical systems.

  3. Battery Storage

    This component stores excess solar energy for later use. Batteries come in various types, with lithium-ion batteries being the most common due to their high energy density and long life.

  4. Battery Management System (BMS)

    Ensures the battery operates safely and efficiently. The BMS monitors the battery’s state of charge, temperature, and overall health, ensuring it operates within safe parameters and prolongs its lifespan.

  5. Monitoring System

    Allows you to track your energy production and usage. These systems provide real-time data on how much energy your solar panels are generating, how much is being stored, and how much is being used. This transparency helps you manage your energy consumption more effectively.

The Process

  1. Solar Energy Generation

    Solar panels generate electricity from sunlight. They capture photons from sunlight and convert them into electrical energy through the photovoltaic effect.

  2. Energy Conversion

    The solar inverter converts the DC electricity into AC electricity. This process is crucial as it makes the electricity compatible with your home’s electrical system.

  3. Powering Your Home

    The AC electricity powers your home or business. Any electricity not used immediately is then directed to the battery storage.

  4. Storing Excess Energy

    Any excess energy not immediately used is stored in the battery. This stored energy can be used later when the solar panels are not producing electricity, such as during the night or on cloudy days.

  5. Using Stored Energy

    During the night or when the solar panels aren’t generating electricity, the stored energy can be used. This ensures a continuous supply of electricity and maximises the use of generated solar power.

Evolve Renewables-Solar Inverter and Battery Storage

Cost Breakdown of Solar Battery Storage Installation in the South East of the UK

The cost of installing a solar battery storage system in the South East of the UK can vary based on several factors, including the size of the system, the type of battery, and the specific requirements of the property. Here’s a detailed cost breakdown:



  1. Solar Panels

    The cost of solar panels can range from £4,000 to £8,000 for a typical 4kW system. The price varies depending on the quality and efficiency of the panels.

  2. Inverter

    A good quality inverter costs between £800 and £1,500. Inverters are crucial for converting the electricity generated into a usable form.

  3. Battery Storage

    The price of battery storage depends on capacity. A 5kWh battery can cost around £4,000 to £6,000, while a 10kWh battery can range from £7,000 to £10,000. Lithium-ion batteries are popular for their efficiency and longevity.

  4. Battery Management System (BMS)

    Typically included in the battery cost but may add an additional £500 to £1,000 if purchased separately. The BMS is essential for maintaining the health and safety of the battery.

  5. Monitoring System

    Basic monitoring systems can start at £100, with more advanced systems costing up to £500. These systems help you keep track of your energy production and consumption.

Installation Costs


  1. Labour

    Installation labour costs can range from £1,000 to £2,500 depending on the complexity of the installation and local labour rates. Professional installation ensures that the system is set up correctly and safely.

  2. Permits and Inspections

    These can add an additional £200 to £500. Local authorities may require permits and inspections to ensure the installation meets safety and building codes.

Total Estimated Costs

For a typical home in the South East of the UK, the total cost of a solar battery storage system can range from £11,600 to £19,000. Here’s a detailed table:

Component Cost Range
Solar Panels (4kW system) £4,000 - £8,000
Inverter £800 - £1,500
Battery Storage (5-10kWh) £4,000 - £10,000
Battery Management System £500 - £1,000
Monitoring System £100 - £500
Labour £1,000 - £2,500
Permits and Inspections £200 - £500
Total Estimated Cost £11,600 - £19,000

The Installation Process


A Step-by-Step Guide


  1. Assessment and Planning

    A professional installer will assess your energy needs and the suitability of your property for solar panels and battery storage. This includes analysing your current electricity usage and potential energy generation from solar panels. This assessment helps in designing a system that meets your energy requirements and fits your budget.

  2. Designing the System

    Based on the assessment, the installer will design a system tailored to your needs. This includes choosing the right size and type of solar panels, inverter, and battery. Customised design ensures optimal performance and efficiency of your solar battery storage system.

  3. Obtaining Permits

    The installer will help you obtain the necessary permits and approvals from local authorities. Navigating through the permitting process can be complex, but professional installers usually handle this to ensure compliance with local regulations.

  4. Installation

    The solar panels, inverter, and battery storage system will be installed. This usually takes a few days. Proper installation is crucial for the long-term performance and safety of the system.

  5. Connecting to the Grid

    The system will be connected to the grid, allowing you to sell excess energy back to the utility company. Grid connection enables you to take advantage of net metering and other financial incentives.

  6. Testing and Monitoring

    The system will be tested to ensure it is working correctly. You’ll also be shown how to monitor your energy production and usage. This step is essential to ensure that your system is operating efficiently and to help you understand how to get the most out of your investment.

What to Expect After Installation


Immediate Benefits


  1. Reduced Electricity Bills

    You should notice a reduction in your electricity bills as you start using the solar energy generated and stored. The savings can be significant, particularly if you live in an area with high electricity rates. Over time, these savings can offset the initial installation costs.

  2. Energy Independence

    You’ll have a backup power source during outages. This is especially beneficial in areas with unreliable grid supply or frequent power cuts. Having your own power source ensures that your essential appliances and systems remain operational even during grid failures.

  3. Environmental Impact

    You’ll be contributing to a greener planet by reducing your reliance on fossil fuels. Using renewable energy helps in reducing greenhouse gas emissions and promotes a more sustainable way of living. Your actions contribute to global efforts to combat climate change and preserve natural resources for future generations.

Long-Term Benefits


  1. Return on Investment (ROI)

    Over time, the savings on your electricity bills can cover the initial investment in the solar battery storage system. Typically, homeowners can see a return on investment within 5-10 years, depending on various factors such as energy prices and system efficiency. This makes solar battery storage a financially sound investment.

  2. Increased Property Value

    Homes with solar battery storage systems are often more attractive to buyers and can have a higher property value. Energy-efficient homes with lower utility costs are in high demand, and potential buyers are willing to pay a premium for homes equipped with renewable energy systems.

  3. Sustainability

    You’ll be part of the solution to combat climate change by using renewable energy. Sustainable living practices not only benefit the environment but also contribute to the overall well-being of communities. By adopting solar battery storage, you are setting an example for others and encouraging broader adoption of renewable energy technologies.

Selling Energy Back to the Grid


How It Works


  1. Net Metering

    Many utility companies offer net metering programmes, which allow you to sell excess energy back to the grid. This is usually done through a bi-directional meter that measures the energy you use from the grid and the energy you send back. Net metering can significantly reduce your electricity bills and provide additional income.

  2. Feed-in Tariffs

    In some areas, you can earn money through feed-in tariffs, which pay you for the energy you generate and feed into the grid. These tariffs are often higher than the cost of electricity you buy from the grid, providing a financial incentive to generate more solar power than you consume.

Setting Up for Energy Sales


  1. Check Local Regulations

    Make sure to check the regulations and incentives available in your area. Local policies can vary, and it is important to understand the specific requirements and benefits applicable to your location.

  2. Grid Connection

    Ensure your system is connected to the grid and configured for net metering or feed-in tariffs. This involves technical configurations and agreements with your utility company to ensure proper measurement and compensation for the energy you export.

  3. Monitoring

    Keep track of the energy you produce and sell back to the grid using your monitoring system. Regular monitoring helps you optimise your energy production and identify any issues that may affect the performance of your system.

Accurate and Relevant Statistics


Solar Energy in the UK


  • The UK government aims to have 40GW of solar capacity by 2030, up from around 13GW in 2021. This ambitious target underscores the growing importance of solar energy in the UK’s energy mix. By adopting solar battery storage, you can be part of this national effort towards renewable energy adoption.
  • Solar energy accounted for 4.1% of the UK’s electricity generation in 2020. This percentage is expected to rise significantly as more solar installations come online and technological advancements make solar energy more efficient and cost-effective.

Case Study: Evolve Renewables


Evolve Renewables has successfully installed numerous solar PV and battery storage systems across Kent and London. Their installations have helped homeowners and businesses achieve energy independence and significant cost savings. Here are a few examples:

Residential Installation in Kent: A school teacher in Chislehurst, Bromely installed a solar battery storage system and reduced her electricity bills by 50%. Mrs Clark now has a reliable backup power source during potential outages. This installation has not only provided financial savings but also enhanced her family’s energy security.

Read more about the solar installation in bromley.

Did you know that the team at Evolve host renewable energy seminars and workshops in their Kent showroom?

Located at 63 Homesdale Road, Bromley BR2 9LB.

Evolve Renewables - 63 Homesdale Rd, Bromley BR2 9LB

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Government Grants

If you live in England or Wales, your installer can apply for a £7,500 grant through the Boiler Upgrade Scheme to cut the cost of installing your air source heat pump. We will apply for the grant on your behalf! The scheme covers heat pump installations that take place before the end of March 2028

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