Energy storage systems can be added to your renewable energy system, such as solar panel installations, to increase its sustainability. The most accessible form of energy storage for homeowners, businesses, and organisations are batteries.

These can be used to store excess energy that is generated by your renewable energy system, for when that resource is in low supply. Such as when it is no longer windy, or the sun isn’t shining. You can also charge these batteries up from the electrical grid to use the stored energy at a later time.

Those that are looking to install a renewable energy system, including a solar energy system, will be asking themselves what kind of energy storage they require. Whether they need a battery with a high voltage or a battery with a low voltage.

Why it is important to choose the right voltage?

Before we begin looking at energy storage and the difference between high and low voltage batteries, it is important to understand what voltage is. Voltage is the pressure that ‘pushes’ the electricity through a circuit, it is the pressure that creates an electrical flow or current. The higher the voltage, the more electricity is pushed, creating a larger electric current.

However, a higher voltage isn’t always the correct option for you. Different applications require different voltages. Choosing a high voltage battery for a low battery application or device can lead to circuits being broken or potential hazards occurring. If you link a low voltage battery with an application or device that requires a higher voltage, this can lead to the application not working at all, or at a much slower rate.


Voltage – Electrical pressure. The potential difference between two points.

Current – The flow of electricity

Electrical Resistance – A force that counteracts the flow of an electrical current

High Voltage

High voltage batteries have an important role as energy storage within renewable energy systems, serving as an essential component for storing and discharging energy. These batteries are designed to operate at an elevated voltage, which enables efficient storage and retrieval of large amounts of energy. High voltage batteries also charge and discharge at a much quicker rate than batteries with a lower voltage.

Within renewable energy systems, high voltage batteries can store excess energy during periods where the renewable resource is readily available to be released during periods where this resource is low or unavailable. At a higher voltage the battery also facilitates the integration of renewable energy into the electrical grid much more efficiently and sustainably.

These energy storage systems may be bigger in size; however, they can increase the efficiency of a renewable energy system within a home. Due to the battery size and capacity to maintain a voltage 400V, the inverter does not have to work as hard to change the voltage to a usable voltage level which usually 300V-500V. Increasing its efficiency.

If you are a household, business, or organisation wishing to meet a large energy demand then a high voltage battery may be the right energy storage solution for you.

Energy Storage

Low Voltage

Low voltage batteries are especially important for decentralised and off-grid applications. These batteries are designed to operate at lower voltage levels, typically of 100V, making them suitable for small scale energy installations.

In off grid systems, these batteries can store energy for use during periods of low availability of the renewable energy resource. Allowing a continuous supply of energy. For those in remote locations these energy storage systems are cost-effective and reliable. They are also much safer, as their small size prevents them from exceeding the temperature they can withstand.

Due to their low voltage for homes, businesses, and organisations, may need to also be connected to the electrical grid. Several batteries may also have to be installed, in order for the voltage to be compatible with the inverter.

Although they have a lower capacity, they are more accessible and affordable, as well as adaptable. They are also much easier to install, upgrade, manufacture, and have a potentially smaller carbon footprint.

If you would like more information regarding the right battery for you, please do not hesitate to contact Going Green at:

Phone: 0333 577 4421