Savings & payback
Solar panel finance: the ways people pay for solar
Most rooftop solar isn't bought with cash — it's financed. How you finance it changes the total you pay and whether the panels ever save you money overall, because interest quietly eats the electricity savings.This guide maps the options and the questions that protect you. It's general information, not financial advice. For what systems cost in the first place, see plug-in solar cost.
Written and edited by Christopher Panteli
Christopher is the founder and editor of MyPlugInSolar. He oversees the site’s research standards, data tools and editorial process. He is not an electrician or solar installer, and specialist technical claims are sourced from official documentation or reviewed by appropriately qualified professionals.
The main ways people pay
- Cash/savings: the cheapest total cost — no interest — at the price of locked-up capital.
- Personal (unsecured) loan: flexible and comparable across lenders; the rate decides everything.
- Installer finance: convenient point-of-sale credit; sometimes genuinely competitive, sometimes an expensive loan wrapped around an inflated system price.
- Mortgage top-up / secured borrowing: low headline rates, but stretched over decades the interest adds up, and your home secures the debt.
- Targeted support: limited grant routes exist for eligible households — see solar panel grants — and some councils run group-buying schemes that cut price rather than lend.
Reading the offers honestly
Two marketing patterns deserve care. 'Interest-free' deals exist, but lenders don't work for free — the cost is typically built into the system price, so compare the *cash price* of the same system elsewhere before deciding the credit is really free. 'No upfront cost' can mean point-of-sale credit (you owe the money), or — in older 'rent-a-roof' style arrangements — that a company keeps your roof's export value for decades. Always identify who owns the panels, who gets the export income, and what happens when you sell the house.
Not financial advice
The sum that matters — and the plug-in contrast
The honest comparison is: total amount repayable (price + all interest and fees) versus realistic lifetime savings (self-consumption, not headline generation). If interest pushes the total repayable beyond what the system will plausibly save, the finance has consumed the point of the purchase. Part of plug-in solar's appeal is dodging this entirely — a small enough outlay that financing isn't needed — though plug-in systems are not yet legal to use in the UK. Whatever you're weighing, anchor it with an independent estimate from the calculator.
Frequently asked questions
- Can you get solar panels on finance in the UK?
- Yes — through personal loans, installer point-of-sale finance, or secured borrowing such as a mortgage top-up. The route changes the total you repay, so compare the total amount repayable (not the monthly payment) against realistic savings.
- Are interest-free solar panels genuine?
- The credit can genuinely be interest-free, but the financing cost is often built into the system price. Compare the same system's cash price elsewhere; if 'interest-free' comes with a premium price, it isn't free.
- Can you really get solar panels with no upfront cost?
- Offers exist, but 'no upfront cost' means either you're borrowing the money (and repaying with interest) or a third party keeps part of the system's value, such as export income. Establish who owns the panels and who benefits before signing.
Sources
- 1. Financial Services Register — Financial Conduct Authority
- 2. Find ways to save energy in your home — GOV.UK
Estimate your solar potential
See how much electricity a small system could generate at your postcode, and the indicative bill saving.