For homeowners with solar panels installed, or who are considering having solar PV added to their home, then having a battery installed alongside your array could help to further reduce your energy bills.

Having a battery storage system added to your solar PV system can add to the cost, but will ultimately deliver additional savings by allowing homeowners to make full use of the power generated by their panels.

excess electricity is diverted to your battery to charge it to capacity

What Is a Home Storage Battery

A home energy storage battery system is a simple concept. They store excess electricity generated by solar PV panels in a battery so that it can be used at a later time.

With many solar brands now offering integrated solutions for solar panel, inverter, and battery storage system products they are becoming increasingly popular as a way to make use of surplus electricity instead of letting it go to waste and monitor your energy usage.

How Does a Battery Storage System Work?

During the height of the day your solar panels will likely be generating more electricity than you are using at any given moment. In a standard setup, that excess electricity will simply be pumped back into the national grid.

With a battery installed as part of your solar PV system, that excess electricity is instead diverted to charge it for later use.

At night time, when your panels are no longer generating electricity and you would otherwise be drawing from the grid, the energy in the battery is used.

save additional money on your electricity bills with solar batteries

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Benefits of Having a Solar Battery Installed

There are multiple benefits of having a solar storage battery installed with your PV system including saving you additional money on your energy bills from home electricity usage, charging an electric vehicle, and ensuring solar power does not go to waste.

Reducing reliance on energy from the national grid will also make your home or business more environmentally friendly.

benefits of smart meters

Electricity Bills Savings

While a battery can have a significant up front cost to install, it will ultimately save you money over the course of its lifespan by increasing the amount of free electricity from your solar panels which can be used in your home.

Reduce your Carbon Footprint

Having battery storage installed will reduce the amount of electricity which you draw from the national grid. This means less fossil fuels burned to provide energy for your home.

solar power as a backup for some essential systems during a blackout

Blackout Protection

Battery storage in Ireland will not typically come with blackout protection in the event that of power outages. That is because your power inverter is required to automatically cut off power during a blackout to prevent any electricity being unexpectedly dumped into the grid while repairs are being made.

However, it is possible to have some dedicated circuits installed which are not connected to the main grid at additional cost. This could allow you to continue using your solar power as a backup for some essential systems during a blackout.

Future proofing Against Changing Electricity Prices

Achieving greater energy independence through renewable energy storage can help future proof against further swings in the price of electricity from the grid.

Main Uses of Battery Storage

Cheaper Electricity

The main goal of having a battery storage system installed in your home is to reduce energy bills by using less or cheaper electricity from the grid to power your home.

Avoid Peak Rates

For homeowners with smart meters installed, electricity providers offer smart plans which offer much cheaper electricity at night, but which costs more during the day. Often there will be a Peak period where rates are at their highest. This is typically somewhere from 5pm – 7pm.

Using stored energy from your battery in a calculated way can help to avoid electricity from peak tariffs.

Night Storage Rates

Some home battery storage systems can allow you to charge from the grid using far cheaper night rates. Rates as low as 10c per kWh in many cases. This power can then be used during the day. However, you are typically unable

EV Charging

The majority of EV charging is done at home during the evening or night time. Having a battery to soak up power during the day to charge your EV at night can help to reduce the cost of an electric car even further.

7 Years

A typical solar installation is fully paid back within 7 years. All solar panels we recommend are under warranty for 25 years, so you will enjoy at least 17 years of free energy generation.

0% VAT

As of 10 May 2023, the government has removed all VAT on solar installation and solar panel supply. This means solar has never been more affordable!

Government Grants

There is a range of government grants available for all new solar installations. Our team will guide you through the application process.

Different Types of Battery Technology

How specific batteries works depends on the type of technology which is being used in your home system. There are two common types of battery storage systems used for home solar, Lead Acid and Lithium-Ion.

Lead Acid batteries have the advantage of still being cheaper, but with technology prices falling all the time, Lithium-Ion have taken over as the main technology in most modern battery storage system.

Lead-Acid Batteries

These batteries are a well known technology, commonly used in cars and other vehicle applications. They have a lower energy density than most other battery types. But, being an established field, they also tend to be cheaper.

Lithium-Ion Batteries

Lithium-Ion batteries tend to be smaller and lighter than their counterparts due to their high energy density. They also tend to have a better depth-of-discharge than their older counterparts. The newer technology also tends to make them the more expensive option, however.

What Size Battery Do I Need for My Home?

The size of battery which would be suitable for you depends on your electricity consumption, along with the number of panels in your solar PV system and its power output.

Ideally, you would like to have a battery system that can handle all of your evening energy consumption, when your solar panels are no longer producing energy.

The average household in Ireland used 3,177kWh of electricity in 2022, which averages out at 8.7kWh per day (Source).

Buying a battery with a storage capacity which exceeds your daily consumption would be pointless. Ideally your solar panels should be supplying most of your electricity in the day, and the battery takes over for the evening time consumption.

Things to Consider When Picking a Solar Battery System

There are multiple technical factors to take into consider when picking a solar battery beyond just its capacity. The battery material, lifespan, storage capacity, depth of discharge, and efficiency can vary greatly between brands and models.

Many of these considerations may also factor into the cost of the battery storage system.

Battery Type

As spoken about above, the choice of technology for your battery system is an important factor in its performance and cost. The newer Lithium-Ion batteries are more compact and efficient, but cost more, whereas Lead-Acid batteries are less costly, but older technology.


This refers to how much of a battery’s total capacity is used up before it is recharged. Having a deeper depth-of-discharge typically results in a battery with a shorter lifespan. If your battery states that it has an 80% DoD, then you should keep it above 20% capacity before recharging.


Solar batteries are not 100% efficient when it comes to transferring and storing the energy generated by your solar panels. The higher the efficiency of your battery, the less electricity that is lost in transition.

AC v DC Coupling

The electricity produced by a solar panel and that which is stored in a battery is in the form of Direct Current (DC). The electricity used in your house, however, is Alternating Current (AC).

This means that the electricity created by a solar panel cannot be directly used in our homes and must be first converted to AC electricity. This is done by the inverter.

If installing a battery along with solar panels there then becomes a technical question of where the battery should be placed.

AC Coupling

The solar electricity goes first to the fusebox of the home grid and is converted to AC. This must then be converted back to DC before it can be stored in the battery.

DC Coupling

The battery is located between the solar panels and the fusebox, meaning that DC electricity from the panels is stored directly without needing to be converted.

AC Coupling DC Coupling
Loss of efficiency from multiple conversions between DC and AC More efficient as electricity does not need to be converted
Battery can be located anywhere in your property Battery needs to be placed in close proximity to the solar panels
Simpler to install if you already have solar panels Solar power goes to fill the battery first
Can also charge from the grid at night with some systems Battery cannot be charged from the grid
Solar power will be used first in the home before filling battery More complicated to add to existing solar PV system

How Much Can I Save With a Solar Battery?

The amount of money which you can save by having a battery installed is dependent on your electricity usage, and how much your electricity costs.

Electricity prices in Ireland have fallen recently, but are still well above 2020 levels, which could make it a more attractive investment to cut down on how much power you draw from the grid.

How much you save with a battery installed will depend on how you use it and your home electricity, the lifespan of the system, and the overall cost of the system.

The amount of money which you can save by having a solar battery installed is dependent on your electricity usage

How Much Do Solar Batteries Cost?

The average cost of having solar battery storage installed in your home can vary greatly depending on numerous factors.

These include the type of battery technology you go with; the size of the battery which could range anywhere from 1kW to 15kW for a home storage system, other aspects such as the battery’s Depth-of-Discharge and Efficiency, as well as the installation costs.

The average cost of having a 5kW solar battery installed in your home will be approximately €2,500. But it’s worth noting that this cost includes the installation process of connecting your battery to your home grid.

That includes getting a hybrid inverter, to connect both the solar panels and battery, which can be significantly more expensive than a string inverter.

It’s worth keeping in mind that your battery will likely to be replaced at least once in the lifetime of the solar panels on your home.

Replacing a battery will be far cheaper than the first installation, as things like the inverter, and electrical wiring have already been handled.

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Best Solar Battery Brands

There are many companies manufacturing solar batteries of different scale and technical quality, and it’s important to choose the brand and model that most closely fits your needs.

Some of the more well known brands of solar battery manufacturer include:

Solar Panel Manufacturer Panasonic
Huawei solar battery

These different companies offer a wide range of products each, batteries of different sizes, with state of the art monitoring systems, AC or DC systems, and the ability to use multiple batteries in sync.

Are Solar Batteries Worth It For You?

Whether solar batteries is right for you depends on multiple factors related to how much electricity you use around the home, the price of electricity, the cost of the system, and more.

With the cost of installing a solar battery, if your surplus electricity is being used for another purpose, it bears thinking about whether the investment is worthwhile.

If you have a power diverter installed to send your excess electricity to the immersion, that means less power which can go to the battery storage.

Selling Surplus Electricity

Since 2022, Ireland also now allows homeowners to sell electricity from solar panels back to the grid. This means that excess electricity being generated by your solar panels can either go to battery storage for later use, or you can be paid for it by your utility provider.

This can potentially help increase the return on investment of your solar PV system, and shorten the length of time before it has paid for itself.

The feed-in tariff, the rate paid for excess electricity, is set by your utility company, and is generally significantly less than what it costs you to buy electricity. So having a battery to alleviate the need to purchase electricity from the grid can be a better investment.


No, there are no specific grants available to reduce the cost of a battery. If you are having one installed at the same time as your solar PV system, there is still the €2,100 SEAI grant for solar panels.

Yes, depending on the number of solar panels installed in your array, they could supply electricity well in excess of what a single solar storage battery can hold.

In that case, it is possible to set up battery storage that links multiple units together in a battery bank.

The Huawei LUNA Smart String Battery comes with a modular design which starts at 5kW, but can easily be expanded to 10kW and 15kW.

Solar batteries tend to have an average lifespan of around 10 years, but can be more or less than that depending on the quality and brand you choose. Most warranties for batteries will also fall into that 10 year period.

While it is simplest to have your battery storage installed as part of the initial set-up of your solar system, you can also have an existing solar PV system retrofitted with a battery.

A battery system requires a hybrid inverter for your solar PV array, rather than the less expensive string array. It also requires a charge controller to ensure there is no voltage overload. In modern systems such as the Huawei Luna this is built into the module.

Batteries are most typically installed alongside solar panels. However, some systems allow for you to store electricity from the grid at cheaper night rates to use during the day.

The average household electricity usage in Ireland is 4,200kWh per year, which comes to 11.5kWh per day. A Huawei Luna battery storage module can stack up to 15kW in capacity. However, a larger issue will be charging it to full capacity with just the power from your solar panels.

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