Solar Panel Finance Explained

A clearer way to think about paying for solar

Solar panels have moved from niche upgrade to mainstream home improvement across Great Britain, helped by rising electricity prices and more visible success stories on local streets. But the buying decision is rarely just about the technology. It is about cash flow: what you pay upfront, what you repay monthly, and what you might save on bills over time.

For many households, the biggest immediate lever is a simple one: residential solar installations can qualify for 0% VAT when supplied and installed by a single contractor, reducing the upfront cost compared with the standard VAT rate. That relief is currently due to run until March 2027, so timing can affect the total project price. Alongside this, households with eligible systems can earn money for surplus electricity exported to the grid through the Smart Export Guarantee, with rates set by suppliers.

Understanding APR is not just about percentages - it is about knowing what you will pay in real terms.

Who this is most useful for

This guide is for UK homeowners who want solar panels (often with a battery) but would rather spread the cost than pay a large lump sum. It is also relevant if you are comparing a secured home-improvement loan with an unsecured personal loan, or if you are trying to sense-check whether the monthly repayments are likely to be covered by bill savings and export payments. If you are remortgaging soon, or you are cautious about borrowing against your home, you will also benefit from understanding the trade-offs before you request quotes.

What solar finance usually means in the UK

In the UK, “solar finance” typically means borrowing to pay an installer, then repaying the lender over an agreed term. Unlike some overseas markets, it is commonly structured as a secured home-improvement loan or second charge mortgage, where the borrowing is backed against your property. That structure can make larger projects more accessible and can bring fixed, predictable repayments, but it also introduces property-backed risk.

Solar finance is increasingly presented as a package because today’s quotes often include more than panels. Many installers now bundle battery storage and, in some cases, an EV charger. This reflects how households increasingly think in terms of a whole-home energy system: generate, store, and use more of your own electricity.

One more point that affects affordability: in Great Britain, residential solar installs can qualify for 0% VAT when supplied and installed by one contractor, potentially lowering the amount you need to fund.

How the money flows: bills, repayments, and export income

A simple way to model solar finance is to follow the monthly money flows. You pay your loan repayment each month. In return, you may reduce the amount of electricity you buy from the grid because you use solar generation during the day. If your system produces more than you use, you can export surplus power and receive an export payment through the Smart Export Guarantee, provided you have an eligible installation and meter set-up.

Adding a battery changes the balance. Rather than exporting everything you do not use immediately, you can store electricity and use it later, often in the evening. That can increase self-consumption and reduce how much your savings depend on export tariff rates, but it also increases the upfront cost and therefore potentially the borrowing amount.

Your best indicator of whether finance stacks up is not a generic payback headline. It is your household usage pattern: daytime consumption, evening consumption, and how much energy you realistically expect to export.

Why the details matter (and where people trip up)

Solar can be an excellent long-term home upgrade, but the financial outcome depends on the fine print. Export payments under the Smart Export Guarantee vary by supplier and tariff type, so “income from export” is not a single fixed number. Similarly, expected bill savings depend on how much of your generation you use on-site, which is influenced by occupancy patterns, appliance use, and whether you add a battery.

Finance can improve accessibility by spreading a cost that would otherwise be out of reach. However, borrowing can also turn a “good value” install into a poor deal if the APR is high, the term is too long, or the system is oversized for your actual usage. If the borrowing is secured against your property, you must be comfortable with the added risk that comes with secured lending.

Standout line: Aim for a plan where savings and export earnings support repayments, rather than hoping they will.

Pros and cons at a glance

Things to look out for before you sign

Treat the quote and the finance as two separate decisions. First, make sure the system specification fits your roof and usage, particularly if a battery is included. Then scrutinise the finance: check the APR, the total amount repayable, the term length, and whether fees are added to the balance. If you are offered a secured home-improvement loan or second charge lending, be clear on what happens if you miss payments and how that could affect your home.

Be cautious with payback claims. In Great Britain, winter generation is lower, and export tariff rates can vary across suppliers, so projections should show assumptions. Ask for scenarios: with and without a battery, and with different export rates. Finally, confirm the VAT position in writing. The 0% VAT relief can make a meaningful difference, but it typically relies on the supply and installation being provided together by a single contractor.

Alternatives to financing solar panels

1. Paying upfront from savings (often cheapest overall if it does not compromise your emergency fund).

2. Unsecured personal loan from a bank or building society.

3. Remortgaging to release equity (may be cheaper, but involves mortgage fees and longer-term implications).

4. Local or community renewable-energy loans, where available and subject to eligibility.

5. Phased approach: panels now, battery later, if your budget is tight and your usage supports it.

FAQs

Is solar panel VAT really 0% in Great Britain?

For eligible residential installations in Great Britain, 0% VAT can apply when the supply and installation are carried out by a single contractor. It reduces the upfront price compared with the standard VAT rate and is currently set to run until March 2027.

How does the Smart Export Guarantee work?

The Smart Export Guarantee requires licensed electricity suppliers to offer export tariffs to eligible small-scale generators. You are paid for surplus electricity you export to the grid, but the rate depends on the supplier and tariff you choose.

Will my repayments be covered by bill savings?

Sometimes, but not always. It depends on your borrowing costs, your daytime electricity use, how much you export, the export tariff rate, and whether you add a battery. A realistic comparison is monthly repayment versus likely monthly savings across seasons.

Is a battery worth financing too?

A battery can increase self-consumption by storing daytime generation for later use, which can reduce reliance on export payments. The trade-off is a higher upfront cost and potentially more borrowing, so it is worth running numbers both with and without it.

What is the difference between secured and unsecured solar finance?

Unsecured borrowing is not backed by your home, but rates can be higher and amounts may be limited. Secured home-improvement lending or second charge borrowing can offer larger amounts and structured repayments, but it comes with property-backed risk.

How Kandoo can help

Kandoo is a UK-based retail finance broker. If you are exploring solar, battery storage, or a broader home-energy package, we can help you compare finance options in a clear, structured way and connect you with lenders that match what you are looking for. We focus on making the costs and terms easy to understand so you can weigh monthly repayments against realistic savings before you commit.

Disclaimer

This article is for general information only and does not constitute financial advice. Solar savings and export earnings vary by home, usage, tariffs, and system design. Always review a lender’s terms, risks and total costs, and consider independent advice if you are unsure, particularly for secured borrowing.