Green home upgrade

Solar Panel Loans —
Finance Your PV Installation

A 3.5 kW solar system can slash your electricity bills by £500–£900 a year — but the upfront cost of £5,000–£9,000 puts it out of reach for many households. Cash Train offers fixed-rate personal loans up to £5,000 to help bridge the gap, with a decision in minutes and no early repayment penalty.

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Unregulated lender • Apply online — decision in minutes • Subject to status and affordability

Warning: Late repayment can cause you serious money problems. For help, go to moneyhelper.org.uk

UK installation costs

What does a solar panel system typically cost?

Solar PV prices have fallen significantly over the past decade, but a full installation remains a substantial household investment. Costs depend on system size, panel brand, roof complexity, and whether you add battery storage. The figures below reflect typical UK market rates in 2024–2025.

3.5 kW system (standard)

£5,000–£7,000

The most popular residential size in the UK. Covers most of the electricity needs of a 2–4 bedroom household. Includes 10–14 panels, inverter, mounting hardware, and installation.

4–5 kW system (larger)

£7,000–£9,000

Suitable for homes with higher energy use — tumble dryers, EVs, hot tubs. More panels means more roof space required and a higher scaffold cost.

Battery storage (add-on)

£2,500–£5,000

A home battery (e.g. Tesla Powerwall, Givenergy, Puredrive) stores surplus daytime generation for evening use. Maximises self-consumption and reduces grid import. Often installed alongside panels.

Inverter replacement

£500–£1,500

Inverters typically last 10–15 years — shorter than panels. If you’re adding a battery to an older system, a new hybrid inverter is usually required.

Scaffold hire

£200–£600

For most pitched roofs, a scaffold tower is required by law for safe installation. Usually included in the installer quote, but worth confirming.

EV charger add-on

£800–£1,200

Many installers offer a bundled home EV charger (OZEV-compliant) at the same time. Charging your car on solar-generated electricity delivers the biggest combined saving.

Smart Export Guarantee (SEG): Since January 2020 the old Feed-in Tariff has been replaced by the SEG. Energy suppliers with 150,000+ customers must offer a tariff for surplus electricity you export to the grid. Typical SEG rates run at 5–15p/kWh. On a 3.5 kW system you might export 700–1,200 kWh per year, generating a modest £35–£180 in annual export payments.

Cost estimates are approximate UK market averages for 2024–2025. Actual quotes depend on installer, region, roof orientation, and panel brand. Always obtain at least three quotes from MCS-certified installers.

Affordability considerations

Is a personal loan right for solar panels?

Solar panels are an investment that pays back over years, not months. Before committing to any form of finance, it’s worth understanding the payback timeline and whether a loan is the right tool for your situation.

When a loan can work well

You want panels now but don’t have the full upfront cost saved — a loan lets you start saving on bills immediately while spreading the purchase cost
Your annual electricity bill is high (over £1,200/year) — payback is faster and loan interest may be partially offset by bill savings
You’re covering a shortfall after using savings or a grant — borrowing a smaller top-up amount minimises total interest paid
You have stable employment income and the fixed monthly repayment comfortably fits within your budget
You plan to stay in the property long-term — solar adds value and payback is typically 7–10 years on a fully self-funded system

Alternatives and grants to explore first

Great British Insulation Scheme / ECO4: low-income households may qualify for fully-funded solar via energy suppliers under ECO4 obligations. Check via gov.uk.
Local authority grants: some councils offer interest-free or subsidised solar loans. Search your council website for “solar panel grant” or “renewable energy scheme”.
Installer finance: most MCS-certified installers offer 0% finance for 12–24 months. Compare total cost carefully — setup fees can offset the headline rate.
Green mortgages / further advance: some lenders offer preferential rates for energy-efficient home improvements. If you have equity, this can be lower-cost than a personal loan.
Free advice: MoneyHelper provides impartial guidance on borrowing for home improvements at no cost.

Payback reality check: A 3.5 kW system costing £6,000 and saving £700/year in electricity takes around 8.5 years to pay back at current energy prices — before factoring in loan interest. If you borrow the full amount over 3 years, total interest charges reduce the net saving. The economics are strongest when you contribute savings and use a loan only to top up.

All loans are subject to status and affordability assessment. Cash Train only lends where repayments are assessed as affordable for you. Indicative figures only.

How Cash Train works

How Cash Train can help fund your solar installation

Cash Train offers personal loans from £100 to £5,000. For solar panels, we’re particularly suited to covering a top-up shortfall after savings or grants — or funding a smaller system or battery-only installation. Here’s what to expect.

£1,000–£2,000

Battery or partial top-up

Ideal for adding a home battery to an existing system, covering your shortfall after a grant, or funding a partial upfront deposit with your installer.

£2,000–£3,500

Small system contribution

Contributes a significant portion of a standard 3.5 kW installation. Works well alongside savings, SEG payments, or installer’s own 0% promotional period.

£3,500–£5,000

Larger top-up

Covers the majority of a small residential system, or funds panels plus a modest battery upgrade on a well-priced installer quote.

Apply online (2 minutes)

Tell us how much you need. No hard credit search at this stage.

Fast decision

Our affordability technology reviews your application in under 2 minutes. We look at your income and outgoings — not just a score.

Clear agreement, before you sign

You see the exact amount borrowed, monthly repayment, total cost of credit, and APR before committing. No surprises.

Funds to your bank, same day

Once signed, the money transfers straight to your current account — ready to pay your installer’s deposit or final invoice.

Fixed repayments — pay off early anytime

One fixed monthly payment, no variable rates, no early repayment fee. Settle in full whenever you choose — only pay interest for the time you borrow.

Unregulated lender • Apply online — decision in minutes

Buying guide

Tips for buying solar panels in the UK

Solar is one of the bigger home purchases you’ll make. These practical tips will help you get the best system at the best price — and avoid common pitfalls.

Only use MCS-certified installers

Microgeneration Certification Scheme (MCS) certification is required to register for the Smart Export Guarantee. Only MCS-certified installers can provide the certificate you need. Search at mcscertified.com.

Get three independent quotes

Solar prices vary by up to 40% for the same system. Always compare at least three quotes. Be wary of high-pressure same-day signing tactics — a good installer will give you time to decide.

Check your roof orientation first

South-facing roofs at 30–40° pitch generate the most electricity. East/west-facing roofs generate around 80% of a south-facing equivalent. North-facing roofs are generally not viable. A reputable installer will assess this before quoting.

Panel efficiency matters more than panel count

A 400W panel from a tier-1 brand (JA Solar, LONGi, Jinko) often outperforms a cheaper 380W panel over 25 years. Ask for the manufacturer’s performance warranty — top panels guarantee 80–90% output after 25 years.

Time battery storage carefully

Batteries add £2,500–£5,000 but deliver most value when electricity prices are high (currently 24–29p/kWh). If your budget is tight, panels first — batteries can be retrofitted later with most modern inverters.

Check warranty cover

You want a 10-year product warranty on panels, 5–10 years on the inverter, and a 2-year workmanship warranty from the installer. Confirm all three in writing before signing any contract.

Common questions

Solar panel loan FAQs

Cash Train will offer personal loans from £100 to £5,000. A 3.5 kW solar system typically costs £5,000–£7,000, so our lending range is best suited to covering a top-up shortfall after savings, a grant, or installer finance — rather than the full system cost. The exact amount you can borrow depends on your affordability assessment. All figures are indicative and subject to status.

Yes — there are no restrictions on how you use a Cash Train personal loan once funds are in your account. A home battery on its own typically costs £2,500–£5,000, which overlaps with our lending range. If you already have panels and want to add storage, a loan specifically for the battery is a common approach.

A personal loan is separate from your mortgage and does not put your home at risk. However, lenders will see the loan on your credit file, and any existing credit commitments are considered when assessing future mortgage applications. If you are planning to remortgage or move within the next 1–2 years, it's worth discussing the timing with a mortgage adviser before taking additional credit.

The Smart Export Guarantee (SEG) replaced the Feed-in Tariff in January 2020. Energy suppliers with 150,000 or more customers must offer at least one export tariff for electricity you send back to the grid. Typical SEG rates in 2024–2025 range from 5p to 15p per kWh. A well-placed 3.5 kW system might export 700–1,200 kWh per year, generating around £35–£180 in annual export payments — useful but not transformative. The bigger saving comes from reducing your grid import.

We carry out a credit and affordability check on every application, but we consider your full financial picture — income, outgoings, and affordability — not just a credit score in isolation. We are designed for everyday borrowers, not only those with clean credit histories. Applying does not affect your credit file at the registration stage.

Research from Rightmove and the Energy Saving Trust suggests solar panels can add 1–4% to property value, and improve your EPC rating by one or two bands — which is increasingly relevant under proposed EPC requirements for landlords and mortgage lenders. The precise uplift depends heavily on location, buyer type, and the property market at the time of sale.

No. You have a contractual right to repay early at any time — there are no early settlement fees on any Cash Train loan. Cash Train is an unregulated lender and the Consumer Credit Act 1974 does not apply to your agreement, but we provide this right contractually. You only pay interest for the period you actually borrow.

Need impartial money advice? Visit MoneyHelper (moneyhelper.org.uk) — a free, government-backed service that can help you compare borrowing options and access free debt advice if needed.

Cash Train is not authorised or regulated by the Financial Conduct Authority. All loans subject to status, affordability assessment, and our responsible lending criteria. Indicative figures only. Representative examples are provided voluntarily for transparency; FCA advertising rules do not apply to Cash Train loan agreements.

Ready to go solar?

Apply online now — get a fast decision with fixed monthly payments. Fixed-rate personal loans from £100 to £5,000, subject to status and affordability.

Apply now →

Warning: Late repayment can cause you serious money problems. For help, go to moneyhelper.org.uk

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