12kW Solar System in the UK: Costs, Batteries + Pros & Cons

Switching to solar power is a wise decision for homeowners who want to reduce their carbon footprint and save money. For growing households with high energy demands, a large 12kW solar system is absolutely needed. 

If a 12kW solar system fits your home requirements, you will need an installer you can trust. Yet finding an experienced professional on your own can drag on for days if done alone. A busy homeowner like you doesn't have that much precious free time to spare.

Fortunately, Household Quotes can help you skip frustrating searches. By filling out a 30-second form, you can receive up to 4 free solar panel quotes from local solar panel installers. Just compare the prices and rest assured – you have no hidden fees to pay and no obligation to place any orders. Click below to begin!

In the UK, a 12kW solar system with battery storage has the capacity to generate 900–2,000kWh monthly or 10,200–24,000kWh annually. That's a lot of electricity and therefore, such a large system caters to 5-6 room households with 5+ occupants.

A photovoltaic solar panel is the essential type for generating electricity, distinct from solar thermal panels serving the purpose of providing hot water. The diagram below shows how solar panels for homes produce electricity.

A typical solar energy system requires:

A typical 12kW solar power system typically requires either 26 450W panels or 32 350W panels. But this number heavily depends on the specific wattage of the panels you choose. 

A general rule of thumb, the higher the efficiency of the panels, the fewer actual items you need. 

The two most common solar battery storage system choices are lead-acid batteries and lithium-ion batteries. Lithium-ion batteries, like Tesla Powerwall and Powervault 3, are the most popular choice for residential installations in the UK.

Usually, a 12kW system goes with a lead-acid battery size of 60kWh–78kWh and a lithium-ion battery sized between 31kWh and 41kWh. 

When choosing a battery, you should opt for its capacity rather than number. The more storage you need, the more powerful your solar battery storage system should be. 

For an accurate estimate of which battery suits you best, it's highly advisable to consult an experienced solar installer. Apart from batteries, they can recommend the best solar panels in the UK based on your energy consumption patterns, local electricity rates, and your budget. 

Click below to get 4 free, non-binding quotes from local installers!

The average cost of a 12kW solar system usually stretches between £12,000 - £13,000.

There are several factors that influence the cost of a 12kW solar system:

To save up on the cost of solar panels, it's best if you compare quotes from various installers in your area or search whether you are eligible for any available grants or solar panel incentives.

Depending on the sunlight hours, a 12kW solar system in the UK produces around 30–66kWh per day, 900-2,000kWh of energy monthly which translates to an average of 10,200kWh per year.

The amount of power a 12kW solar system can produce heavily depends on the amount of sunlight it receives. 

To achieve the best result, make sure your roof faces south and the angle is typically around 30 to 45 degrees in the UK. This angle helps capture sunlight more effectively throughout the year, maximising the energy output of your 12kW system.

The amount of sunlight received in the UK varies depending on the region. Here's a breakdown of the average daily sunlight hours in the UK:

For example, a 12kW system that receives 4 sunlight hours on average daily during the year, produces around 975kWh per month. 

If you think your household doesn't require this much electricity, you can switch to solar systems with lower capacities:

On average, solar panels typically last for 25 to 30 years. Yet the solar panel size influences the break-even point greatly. 

Generally, you have to consider the cost of your 12kW solar system, the cost of electricity in your area, and the amount of sunlight in your area.

Let's say you install a 12kW solar panel system for £14,000. 

The average cost of electricity is 24p/kWh (Ofgem) and the system's annual production is 10,200 kWh. By multiplying the annual energy production by the energy costs we find out the annual savings, £2,703 for our situation. 

By dividing the system cost of £12,000 - £13,000 by the amount of annual savings we received, we get an approximate break-even point of 4 - 5 years.

So, there are approximate break-even periods for a 12kW solar panel system:

Yet these are just rough estimates and you should contact a professional for more tailored information. 

Are you already dreading the thought of spending your weekend searching for an installer instead of time out with friends? Indeed, googling the quotes and reading customer reviews might take hours of your time with no guarantee of successful finds. 

Household Quotes is here to help you avoid time-consuming browsing. Complete our 30-second form and receive up to 4 free quotes from trusted solar panel installers near you. Our service is free and non-binding – just compare the offered quotes with no pressure to place any orders. Click below to get hassle-free solar panel quotes.

Solar panel advantages and disadvantages can vary based on factors such as location, individual energy needs, or availability of local regulations. 

While there's a list of benefits, large solar panel systems come with some drawbacks. 

Are solar panels worth it in the UK? Determining whether a 12kW solar system with batteries is worth it depends on various factors and individual circumstances. There are several factors you should consider:

12kW solar systems are an optimal solution for households with higher energy demands. Yet, the initial investment and roof requirements can be too costly for some homeowners. 

If you're still in doubt whether your home will benefit from a 12kW system, it's best if you seek professional advice. This way, you get a recommendation tailored to your particular housing situation and heating requirements.

Household Quotes can help you find your dream installer without monotonous searches. Simply complete our 30-second form and we'll provide you with 4 quotes from installers near you. Our service is free and non-binding. Click below to begin!