Mana Solar

Commercial, Industrial Battery Storage (BESS)

A Commercial battery energy storage system (BESS) uses a group of batteries to store electrical energy. Battery storage is the fastest responding dispatchable source of power on electric grids, and it is used to stabilise those grids, as battery storage can transition from standby to full power in under a second to deal with grid contingencies.

Organisations can utilise BESS in isolation with grid supply or as part of a hybrid renewable installation.


Batteries give your business flexibility and protection from rising energy costs, black and brown outs by helping you become more self-sufficient. In addition, depending on your energy needs, modest additional revenue can be realised from selling excess generation back to the grid.

We’ll connect your storage system to your existing energy infrastructure. The battery will sit between a power source, whether it’s one of the varieties of renewable energy solutions or your grid connection, and your site’s operations.

The battery can be used to store energy as a back-up power supply or to deliver power to the local grid. You could also trade your stored energy in the wholesale energy market, or use it for your own on-site applications to save money.

If you are installing renewables such as Solar PV we will integrate BESS at the time of installation. The two systems will work in collaboration. In fact, renewable energy without storage is clean energy lost to the site. Many PV systems generate more energy than they need so storing that energy for later use can bring significant advantages to a business.

The batteries can be programmed to charge up when there is excess generation available and then used later to provide power either during peak energy use on site or at times of the day when the sun stops shining or the wind stops blowing.

Owing to long term chronic underinvestment by the UK government and the utility companies the national grid may not be able to cope at times with the demands placed on it by the growing population and renewable energy being fed back into the system.

Battery energy storage systems use batteries to store and provide power as and when it is needed. Importantly, for EV charging infrastructure, BESS can deliver the additional energy needed to manage peak demand or avoid the need for expensive local infrastructure upgrades.

No. Although many of our customers have introduced a battery energy storage system alongside other clean energy measures, it does not have to be the case.

Battery energy systems can be charged using electricity from the grid. There are two key benefits to this: to store energy when tariffs are cheaper (to use when it’s not) or to solve a problem of peak loads on site by storing energy to support spikes in demand when capacity is an issue.

However, given the UK Government’s commitments to the Net Zero Strategy it would be prudent for organisations to consider renewable energy systems to be invested in at the same time as a BESS system.

Any customer could use their BESS to provide grid balancing services. This is basically the storing and discharging of the grid to ensure an uninterrupted national supply. The National Grid pays customers for this service.

The key component that can cause delays is liaison with the DNO (Distribution Network Operator), particularly at present as they are inundated with applications. Any site seeking to potentially feed electricity back to the grid is required to comply with G99 regulations – this is to ensure that if the grid goes down the generator doesn’t try to feed into the network connector, as this is a safety requirement. This assessment and approval process can take some time – depending on the DNO.

This application process is part of the service Mana provides, we will keep you updated throughout.

BESS come in varying sizes, from small residential systems to large utility-scale projects over 100MW/100MWh in size that connect directly to the transmission network. Typically 1MW to 5MW are the size we have been seeing in the market.

We estimate each individual battery will last seven to nine years. We install a rack system, so if we identify any performance issues, we can easily swap and replace them for another.

Our battery management system gives us data on the battery’s health throughout the day, meaning you are always aware of how your system is performing. Mana can assist with this monitoring, via a remote management system.

“Depth of discharge”    is the proportion of the battery’s nominal capacity available to use e.g. a battery may have a nominal value of 5kWh but if the Depth of Discharge is 80% then the amount charge that can actually be used is only 4kWh. 

“Usable Capacity” – is the number of kilowatt-hours (kWh) of energy that a fully charged battery will provide before the battery management system stops any more charge being taken. This is measured as the number of kilowatt-hours to charge the battery so the amount of energy actually available for you to use in your home is typically about 95% of this value, because of small efficiency losses as the battery is charged and discharged.


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