How Do Batteries for Solar Panel Storage Work

A man struggling to installing solar panels on to a roof

Harnessing the sun’s power has never been more accessible or efficient, thanks to the advances in solar panel technology and the advent of solar panel battery storage. By pairing your solar panels with an efficient battery storage system, you can take full advantage of the solar energy you generate, irrespective of when you need it. However, many homeowners are asking how batteries for solar panel storage work. Read on to find out.

How Do Solar Panel Storage Batteries Work

Solar panel storage batteries are a middleman between your solar panels and your home’s electrical system. When solar panels produce more power than your home can consume during the day, the excess energy is directed to charge the battery. Then, as night falls or during increased demand, your home taps into this stored energy, minimising the need for grid-based electricity.

Selecting Your Solar Panel Battery Storage: Factors to Consider

There are various factors you’ll need to consider when selecting a solar panel battery storage system for your home:


Capacity relates to the total amount of electricity a battery can store, measured in kilowatt-hours (kWh). The suitable capacity for you depends on your household’s energy consumption and the output of your solar panel system.

Depth of Discharge (DoD)

DoD indicates the percentage of a battery’s energy discharged relative to the overall capacity. Batteries last longer when not regularly discharged, so a higher DoD means you can utilise more of your battery’s capacity.


The lifespan of a battery storage system varies depending on the model and how frequently it’s cycled (charged and discharged). Therefore, it’s essential to understand how many cycles a battery will last and whether the manufacturer offers a warranty for a certain number of years or cycles.

Round-Trip Efficiency

Round-trip efficiency represents the amount of energy consumed as a percentage of the amount of energy it took to store it. The higher the round-trip efficiency, the more economic value you’ll get from your battery.

Types of Solar Panel Storage Batteries

Several types of solar storage batteries are available, each with its benefits and drawbacks. The most common found in the UK are:

Lead Acid Batteries

Lead-acid batteries are a tried-and-true technology, long-used in cars and for off-grid power systems. While these batteries are bulkier and have a shorter lifespan than other types, they are also typically more affordable.

Lithium-Ion Batteries

Lithium-ion batteries are the same technology in most modern electronics, including mobile phones and electric cars. These batteries are popular due to their long lifespan, compact size, and high efficiency. Notably, the Tesla Powerwall, one of the most popular solar batteries, uses lithium-ion cells.

Saltwater Batteries

A more recent innovation, saltwater batteries offer an environmentally friendly alternative to lead-acid and lithium-ion. Instead of using heavy metals, these batteries use saltwater electrolytes. While the technology is still maturing, it presents a promising future direction for renewable energy storage.

Solar Panel Battery Storage: Installation and Maintenance

Just as essential as the type and capacity of your battery storage system is the quality of its installation and maintenance.


A certified professional should always perform the installation. While some homeowners become tempted to cut costs by undertaking a DIY installation, it’s crucial to remember that poorly installed systems can be inefficient, unsafe and may void warranty protections.

The location of the battery is another critical factor to consider. Installation of batteries should be in a clean, dry, and ventilated space. Outdoor installations may require weatherproof casing to protect the system from the elements.


Depending on your battery type, some routine maintenance may be necessary. For instance, flooded lead-acid batteries require regular topping up with distilled water. On the other hand, sealed batteries (like most lithium-ion and saltwater models) are generally maintenance-free, but periodic inspections and cleaning are advisable to ensure optimal performance.

The Financial and Sustainable Benefits of Solar Panel Storage Batteries

Installing a solar panel storage battery is an investment in your home and the environment. Using a cleaner and renewable energy source helps reduce your carbon footprint and contributes to a sustainable future by utilising a renewable energy source.

Moreover, these batteries can provide significant financial savings over time. While the upfront cost can be considerable, using solar power to meet your energy needs can drastically reduce your electricity bills.

The Future of Solar Panel Storage Batteries

As technology advances and the push towards renewable energy gains momentum, the future of solar panel storage batteries looks incredibly bright. Improvements in efficiency, lifespan, and affordability are on the horizon, making solar power a viable and attractive option for an ever-increasing number of households.

In conclusion, the rise of solar panel storage batteries marks a new era in renewable energy. By storing and maximising solar-generated electricity, they offer the potential for more sustainable, self-sufficient homes and a cleaner, greener future. With such potential at our fingertips, it’s clear that these batteries aren’t just powering our homes – they’re powering a revolution.

Are you interested in using solar energy in your home? In that case, we recommend getting solar panel and battery installation quotes from at least two trusted installers to ensure you get the best price for your project.

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