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solar battery storage your guide to sustainable energy

Solar Battery Storage: Your Guide to Sustainable Energy

When installing a solar energy system, many opt for solar battery storage to maximise the benefits. Solar batteries store excess energy generated during the day, allowing you to use it once the sun goes down. Let's dive into why this is a smart addition to your renewable energy setup.

Why Consider Solar Battery Storage?

A solar battery can be a relatively inexpensive addition to any solar energy system, especially since you won’t pay 20% VAT on it due to UK government policy. This investment helps you save money in the long run by using renewable energy to power your home, regardless of the time of day.

Most systems produce more energy than you can use during daylight hours. If you’re home during the day, you can utilise that power immediately. However, if you’re out for large parts of the day, the power from your panels either goes to the grid for minimal financial return or isn't used at all. Hence, storing that energy for later use is a no-brainer for most people.

What is a Solar Battery?

Solar batteries enable you to use the energy you produce at any time, reducing your reliance on external energy sources. Without a battery, the energy generated must be used immediately or sold back to the grid, often for pennies. Using stored, clean energy to power your home instead of relying on fossil fuels has significant environmental benefits.

Most batteries come with battery management software to ensure they charge and discharge efficiently, which extends their lifespan and ensures safety. If a battery doesn’t have its own management system, the inverter will handle the charging process. Currently, most residential solar installations use Lithium-Ion batteries.

Why Lithium-Ion Batteries?

Lithium-Ion batteries are popular for several reasons:

  • Low Maintenance: With a good battery management system, even a cheap Lithium-Ion battery will last over 6,000 charging cycles.
  • Cost-Effective: The cost of Lithium-Ion batteries has dropped significantly due to the rise of electric vehicles.
  • High Energy Density: They can store more energy compared to traditional lead-acid batteries.
  • High Efficiency: They have a high depth of discharge, meaning you can use a significant portion of the stored energy before needing to recharge.
  • Long Lifespan: Most companies guarantee them for at least 10 years.

Do You Need Solar Battery Storage?

While not necessary for your solar panels to work, having a battery storage system is highly beneficial. It allows you to use self-generated solar energy in the evening, reducing waste and maximising your investment. Without batteries, excess energy generated during the day can only be sold back to the grid at low rates.

What Size Solar Battery Do You Need?

The size of the battery you need depends on your home and electricity usage. Here’s a rough guide:

One-bedroom flat or bungalow: 2 kWh

Two-bedroom terrace house: 4 kWh

Three-bedroom semi-detached house: 8 kWh

Four-bedroom detached house: 9.5 kWh

Some companies recommend having twice as much storage as your solar power generation capacity, but this isn't always necessary. A balanced approach ensures efficient energy use and cost-effectiveness.

How Much Does Solar Battery Storage Cost?

Costs vary based on brand, materials, and build quality. On average, prices range from £400 to £500 per kWh of storage capacity. For example, a Greenlinx 3.2 kWh battery is around £1500, while a Tesla Powerwall 2 (13.5 kWh) is approximately £9500.

Key Considerations for Choosing a Solar Battery

Energy Usage: Consider how and when you use your power. If your home experiences peak usage in the morning and evening, a battery can help you utilises stored energy during these times.

Cost: Evaluate whether the savings from reduced energy bills justify the initial investment in battery storage.

Space: Ensure you have adequate space to store the battery, either inside your home or in an outdoor cabinet.

Understanding Solar Battery Specifications

  • Depth of Discharge: Indicates the percentage of the battery’s capacity that can be used.
  • Operating Temperature: Lithium-Ion batteries operate well in both high and low temperatures, though extreme conditions can affect performance.
  • Lifespan: Measured in charge/discharge cycles, with most batteries lasting between 6,000 to 10,000 cycles.

Can You Have Multiple Solar Batteries?

Yes, you can have multiple batteries to increase storage capacity. Some systems allow for easy expansion by adding more units as needed.

Maintenance and Longevity

Solar batteries require minimal maintenance but should be kept at optimal temperatures and checked regularly for damage or loose connections.

Financial and Environmental Benefits

Using solar battery storage can significantly reduce your electricity bills and reliance on the grid. Additionally, it contributes to a reduction in carbon emissions by utilising clean energy.

At Fusion Solar UK, we're here to help you navigate the world of renewable energy and make informed decisions about your solar and battery storage needs. If you have any specific questions, feel free to reach out to us!

For more detailed information on battery options and pricing, contact us at Fusion Solar UK.

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