Can I add extra batteries to a solar system?

Batteries have long been used to store excess power from solar systems. However, due to their high cost and low efficiencies, they were previously not recommended for home buyers. However, batteries have improved both in price and efficiency, and are fast becoming an industry standard as part of a solar system.

If you're looking to add a battery to a solar system or add a new battery to an existing battery, find out more about your options.

solar batteries growatt tesla triple power lux power

Can you have more than one solar battery?

You can have multiple solar batteries. Those with especially high energy usage may install 2-3 batteries. Usually, however, the average UK home will only add one battery to their solar system.

How much does a battery cost?

A solar battery typically costs upwards of £3,000. The exact cost depends on its storage capacity, its brand, and the type it’s made from.

Can I add a battery to a battery?

Yes, you can add a battery to an existing battery. It’s best to have batteries of the same type when doing this. 

It depends on the compatibility of each brand. Check with a professional solar expert to find out which batteries you can use with your inverter.

Can you mix and match solar batteries?

It’s best not to mix and match solar battery brands. Using batteries of the same type will give you the best results and is a safer option. For example, pair a Growatt battery with a Growatt battery.

When the solar battery is installed, it must be compatible with an inverter. Whether your inverter is AC-coupled or DC-coupled will affect which type of battery you can add to the system.

If your solar panels have a microinverter, then the solar battery will have to be AC-coupled. 


What are the best battery storage systems?

Lithium-ion batteries are widely regarded to be the most efficient and safe batteries.

Generally, lithium-ion batteries can supply more cycles than lead-acid, and are therefore more efficient. Lithium-ion batteries have better power efficiency as one cell has longer charge retention than other battery types.

How does battery storage work with solar?

Solar panels and batteries are increasingly popular. Solar energy created by panels is stored in batteries for future use. You can then power appliances in the evening once the sun has gone down and your panels stop generating electricity. 

Installing multiple batteries to a solar system will allow you to power more appliances. If your household uses a lot of energy, you might benefit from installing more than one battery.

Can I charge a battery directly from a solar panel?

No, you can’t charge a battery directly from a solar panel. A charge controller is typically required to protect the battery by transforming the panel's output to one appropriate for the battery getting charged.

You also will an inverter to transform the electricity the DC (direct current) generated by the panels into AC (alternating current) to be used in the home. A battery stores DC current, so you will also need an inverter for the charging system to work.

How do Solar Batteries work?

Exactly how do batteries work in conjunction with a solar system?  When the sun shines, solar panels generate the energy and convert it to direct current (DC). The electricity is then routed to your inverter, which converts it to alternating current (AC), that you can use in your home and property. Your system generates energy, which is then used to power your lights, appliances, and devices.

But what if your system generates more electricity than you consume? This is where a battery would come in handy if you installed one. You can store this excess energy in the battery. When you use more electricity than your solar system produces, you can use energy stored in a battery rather than the grid.

Can I add a battery to my existing solar system?

In most cases, you should be able to easily add a battery to an existing solar system. You should be careful to make sure that the solar installer doesn’t invalidate the warranty of your solar system. 

To add a battery to an existing solar PV system, you’ll need to ensure that the battery works with your solar inverter. In this scenario, you’d have an AC coupled inverter. This means it is ready for the installation of a battery, and a battery can be added straight onto the system.

Do I need an inverter for each solar battery?

No, you don’t need a separate inverter for each battery. Instead, multiple batteries can be connected to the same system.

Which solar batteries are best to add to a solar system?

The Growatt battery UK is a top industry choice to pair with a solar system. 

The Lux power battery storage system works well for those looking for easy to install extra storage.

The SolaX triple power battery has great reviews that highly recommend this home storage battery.

To find out more about solar batteries, contact Smart Energy today.