How Much Does a Solar Panel Battery Cost?

By Cormac Breen

Content Manager

Cormac is Selectra.ie's energy expert along with being the chief content and editorial manager for the website. His aim is to help find the best deal for you and your home energy needs so that you save money on your annual bills. His knowledge and experience of the Irish energy market allows him to offer the best advice and insight into current prices, emerging trends and overall energy saving tips.

A solar panel battery can cost between €1,500 to €7,000. The main factor that influences the cost of a solar battery is its capacity with 5kW batteries costing between €2,000 to €3,500, while larger, 10kW batteries costing between €4,500 to €7,000. Unlike solar panel installation, there are no SEAI grants available for the purchase of solar batteries.

How Much Does a Solar Panel Battery Cost?

Solar panel storage batteries cost between €2,000 to €7,000 to purchase and install.

There are several factors that will affect your final price including:

1. Capacity
   The capacity of your solar panel battery will most likely be the biggest factor in determining the final cost. You should make sure you get the capacity your house and family might need in order to match your usage.
2. Warranty
   Solar panel battery warranties can usually last up to 10 years based on the number of charging cycles you have.
3. Battery Type
   Your solar battery type will not only affect its longevity but also its cost. The cheapest solar power batteries will typically be lead acid ones as lithium-ion can be a little more expensive.
4. Maintenance Cost
   Maintenance will be a long-term ongoing cost for your solar power battery over time. You want to perform maintenance on your battery every year to make sure everything is working properly and so boost its lifespan.

The table below outlines the estimated cost of a 5kw and 10kw solar battery:

Where Can I Buy a Solar Panel Battery?

You should be able to get a solar panel battery from the same solar panel company that you've bought your solar panels from.

Here are some of the main solar panel companies in Ireland:

• Electric Ireland
• Solartricity
• Solar Electric
• Alternative Energy Ireland
• NRG Panel
• Green House Renewable Energy
• LVP Renewables
• Thermasol
• PureVolt Solar

Which Is the Best Solar Panel Battery?

Choosing the best solar panel battery will heavily depend on individuals needs, priorities and budget.

The main factors to consider are:

• Capacity: How much energy can the battery store?
• Power Output: How much power can the battery deliver at once?
• Depth of Discharge (DoD): What percentage of the battery's capacity can be used?
• Cycle Life: How many times can the battery be charged and discharged?
• Warranty: What is the manufacturer's warranty?
• Safety: What safety features does the battery have?
• Cost: What is the overall cost, including installation?
• Compatibility: How well does the battery integrate with your solar system?

Below you will find an overview table of some of the leading solar panel batteries available on the Irish market:

What Size Solar Battery Should I Buy?

Choosing the correct battery capacity (measured in kilowatt-hours or kWh) is crucial. It must cover your evening and overnight usage.

The ideal size is based on your average daily consumption and your highest-load appliances (like an EV charger or a heat pump).

Step 1: Find Your Daily Energy Usage

The most accurate way to do this is to check your annual energy bill and find your total kWh consumption.

Divide that figure by 365 to get your daily average.

Example: 4,200 kWh per year 365 days = approx 11.5 kWh per day.

Step 2: Match Usage to Capacity

Use the table below as a guideline for common Irish households.

Most modern solar batteries are modular, meaning you can start small and add capacity later if needed:

Technical Considerations: AC vs. DC Coupling

The technical setup determines the efficiency and cost of adding a battery.

The main choice is how the battery "couples" with the solar panels and the inverter.

What Are the Financial Benefits of a Solar Battery?

The Irish energy landscape—characterised by high electricity prices and Time-of-Use (ToU) tariffs—means a solar battery is no longer just a luxury; it is a fundamental financial tool.

Its main purpose is twofold:

1. Maximising Solar Self-Consumption

On a sunny day in Ireland, your solar panels often generate far more power than you can use instantly.

Without a battery, this excess energy is exported to the grid in exchange for a Clean Export Guarantee (CEG) payment (currently averaging €0.20 - €0.25 per kWh).

However, the power you import from the grid in the evening is significantly more expensive (often €0.35 - €0.45 per kWh).

A battery changes this equation entirely:

1. Without a Battery: You might only use 30-40% of the solar energy you generate.
2. With a Battery: You capture and store that surplus, increasing your self-consumption to 70-80% or more, directly offsetting the most expensive power you would otherwise buy in the evening.

2. Time-of-Use (ToU) Arbitrage Strategy

For homeowners with a smart meter on a Time-of-Use tariff (like an EV Night Boost plan), the battery allows for a massive year-round saving strategy, regardless of the weather.

1. The Strategy: Use the energy management system (the inverter) to charge the battery from the grid during the ultra-cheap overnight hours, often between 2 a.m. and 5 a.m. (rates can be as low as €0.09 per kWh).
2. The Saving: You then discharge this cheap, grid-charged power to run your home during the expensive evening peak (e.g., 5 p.m. to 8 p.m.).

This strategy effectively eliminates the need to buy peak-rate electricity, providing significant, consistent savings that dramatically shorten the overall payback period for the entire system.

Are There Grants Available For Solar Batteries?

Unfortunately there are no SEAI grants available for solar batteries and the cost must be covered 100% by the homeowner.

Despite this, you can avail of SEAI grants for solar panel installation and DIY solar panel kits. The savings made from the grant could be reinvested into a solar battery to maximise the savings potential of your new solar panal system.

What Is a Solar Panel Battery?

A solar panel battery is a home storage device that allows you to store excess solar energy produced by your solar panels or other sources.

They work in a similar way to the rechargeable battery in your mobile phone and are made of the same lithium-ion material.

Given there are times when your solar panels will produce more energy, it is a convenient and cost effective way to maximise thier output by storing energy for later use.

Solar batteries can be charged by either:

1. Surplus solar power energy - any excess energy produced by the panels can be stored in the batteries for later use in the home.
2. Electricity from your supplier - you can take advantage of cheap night time rates to charge your solar batteries to use during the day time hours when rates are higher.

Most homes won't use all of the electricity generated by their solar panels so having solar batteries installed is a great way to make sure you maximise the output, and savings, offered by your solar panels.

Are There Different Types of Solar Panel Batteries?

Our homes and electricity grid use AC (alternating) current, while solar panels and batteries produce and store DC (direct) current. Therefore, the energy produced by the panels must first be converted to AC before we can use it in our homes.

There are two types of solar battery systems that allow for the energy produced by the panels to be used in the home:

1. AC-Coupled System
   In an AC-coupled system, the electricity from the solar panels passes through an inverter in order to convert it to AC (alternating current) before it powers your home.
   The excess then needs to be converted back into DC before it can be stored in your solar panel battery.
   The stored electricity in your battery will need to be converted back into AC in order to use it for your home.
2. DC-Coupled System
   A DC-coupled system uses a direct current (DC) where the electricity generated by the solar panels flowing directly in the solar panel battery is stored for later use. This is more efficient than the AC-coupled system but takes more time to install.

What Is the Lifespan of a Solar Panel Battery?

The lifespan of a solar panel battery depends on a number of factors. Overall, most solar panel batteries will last between 5 to 15 years so you can expect to need to replace it around then.

However, some high-end systems or specific types can last around 20 to 30 years and also habits you can incorporate to make sure they last longer.

How Does the Solar Panel Battery Type Affect the Lifespan?

Crucially, one of the most important determinants will be the material your battery is made of since you can have two different types of solar panel batteries: lithium-ion, lead acid.

1. Lithium-ion
   A lithium-ion solar panel battery is most agreed to be the best type to get. Lithium-ion batteries usually have the longest lifespan and are the most compact. They also have a higher Depth of Discharge (DoD) meaning they can be more depleted before needing to be recharged.
2. Lead Acid
   A lead acid solar panel battery has been the standard for a long time now but they are slowly being phased out due to their lower DoD. They also don’t last as long as lithium-ion batteries. However they are still much cheaper than the other options available.

What Other Factors Affect a Solar Panel Battery Lifespan?

There are also other factors that can affect the lifespan and are worth considering when looking at buying a solar panel battery and while looking after it:

1. Usage
   The frequency in which you use your solar panel battery to store electricity will affect how long it will last. If it’s been regularly used then it’s likely that the battery will lose efficiency over a shorter period of time.
2. Temperature
   Keeping your solar panel battery at an optimal temperature will affect its efficiency. You want to make sure that the battery is neither overheating or too cold. Your solar panel battery installer will usually recommend where you should have it installed to maximise its lifespan.
3. Maintenance
   Regular annual solar panel maintenance is critical for making sure your solar panel battery is working well and as efficiently as possible. It can cost a little more, but it’s worth it for extending your solar panel battery’s life.

What Are the Pros and Cons of a Solar Panel Battery?

Overall, there are lots of advantages and disadvantages to using solar panels.

If you’re considering having solar panels installed, you should definitely consider having a solar panel battery to go with it and factor its costs into your calculations.

Here’s a quick breakdown of the advantages and disadvantages of a solar panel battery:

Advantages of a Solar Panel Battery

• Better for the Environment
  Having a solar power battery means you’ll be able to take even more advantage of reducing your carbon footprint and Ireland's greenhouse gas emissions to hit our Paris Agreement targets. Solar panel batteries will also ensure you don’t have to rely on the grid as much and therefore reduce your impact on the environment.
• Less Wasted Power
  With a solar power battery, you will be able to maximise the output of your solar panels by being able to store the excess energy for later. This is important since you won’t let as much renewable electricity go to waste.
• Less Reliance on Energy Suppliers
  A solar panel battery will also reduce the amount of energy you use from your energy supplier. While you won’t go off the national grid completely, you can still use the solar panel battery to reduce your electricity bills.
• Backup Against Power Cuts
  Not needing to worry in the event of a blackout is another big plus to having a solar panel battery. Since you’ll have the excess electricity stored in your solar panel battery, the power will start flowing from here in the case that you have a power cut in your area.

Disadvantages of a Solar Panel Battery

• High Costs
  The high upfront costs to a solar panel battery is the greatest barrier to having one installed. You should really consider if you really want one or you can make do with just the solar panels.
• Tricky Installations
  Especially DC-coupled solar panel batteries, you might find that it’s trickier to install than originally planned depending on the type of solar panel components you have.
• No SEAI Grant Available
  Although you can get an SEAI grant for photovoltaic solar panels, there’s no such option for a solar power battery meaning you’ll most likely need to fund the battery yourself.

By Cormac Breen

Content Manager

Cormac is Selectra.ie's energy expert along with being the chief content and editorial manager for the website. His aim is to help find the best deal for you and your home energy needs so that you save money on your annual bills. His knowledge and experience of the Irish energy market allows him to offer the best advice and insight into current prices, emerging trends and overall energy saving tips.