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  • What is Energy Storage and how does it work?

    Energy Storage is designed to maximise the self-use of onsite generated power, like solar, to benefit from multi-tariff differences or for energy trading and grid services. Preferably all of these can be used together to provide revenue, energy security and independence, lower bills and the knowledge you are maximising your opportunity to generate clean energy for your home, business or community.

    What's the best Energy Storage for me?

    The main type of Energy Storage is known as AC-coupled. In other words, it's just another circuit on your consumer unit (distribution board). It can be installed with or without renewables and when co-located with solar can be retro-fitted universally. DC-coupled systems, known as Hybrid, make use of an all-in-one solar inverter-battery charger. It's more efficient and can be a good idea installed with solar, but has limitations compared to the AC-coupled flexibilty.

    The Modular Storage Option

    2.4kWh complete kit from £1495.00

    These can be either AC or DC coupled depending on the site and requirements. It's the best value option, has basic functionality, such as timed charging, but will really boost solar self-use. These are tried-and-tested units that have been used in the telecoms and IT industry. They come in 2.4kWh to 3.5Kwh modules. The main advantage of these is the lowest cost per kWh and the option to 'grow' the capacity.

    Installation costs tend to be quite low, starting around £395 but it will depend on the electrical installation and distances for cable runs.

    Modular but higher power

    Complete kits from £3495

    Similar to the above arrangement, there are more powerful and higher capacity options priced in a higher bracket. These tend to be AC-coupled but there are a variety of products and sizes available. They also tend to have considered the aesthetics.

    Some are specialised for aggregate trading, some are aimed to compete with Tesla, and others are targeting niche markets, with second life vehicle batteries.

    Hybrid Systems

    Inverter/charger with batteries from £2995

    Combining the solar and battery inverter into one device has some advantages, such as higher efficiency DC-DC conversion and slightly lower costs to install. It's less flexible than AC-coupled, can't usually provide powerful emergency back-up and generally is best suited to a garage, not a loft.

    There is a wide choice here, overlapping with the above modular options.

    The Tesla Powerwall

    13.5kWh for £7750

    For high power, high capacity and the best engineered and supported storage available, the Tesla Powerwall has no competition. It is the King of Storage...miles ahead of the rest. It has 5kW of continuous power and 13.5kWh of usable capacity. They can be stacked for higher power still and provide responsive power on demand. With the new Gateway2 interfacing with the grid, it will give emergency back-up power safely and quickly.

    Installation costs can start from as low as £495 for the most conveniently located systems. Typically its around twice this but it really depends on the site and circumstances.


    The engineering is superb, matching the aesthetic and unrivalled support