How much do solar panels cost in 2026?

In the UK (May 2026), a 4 kWp residential PV system costs £6,000–£8,500 fully installed; 6 kWp £8,500–£11,500; 8 kWp £11,000–£14,500. Battery storage adds £4,000–£7,000 for a 5–10 kWh unit. US prices: roughly $2.60–$3.30 per watt installed, so an 8 kW system is $20K–$26K before the 30% federal tax credit.

How many kWh will my panels produce?

As a rule, 1 kWp of south-facing panels in the UK produces ~850–1,000 kWh/year. In the US southwest it's 1,500–1,800 kWh/yr. Multiply your system size by your local kWh-per-kWp factor. East/west facing reduces output ~15%, shading or sub-optimal pitch can knock another 10–25% off.

What is the typical payback period?

At UK 2026 prices and 28p/kWh electricity: 6–10 years for a system without a battery, 7–12 years with a battery. The 25-year panel warranty means most systems generate free electricity for 13–18 years after payback. US payback with 30% tax credit and net metering is typically 7–9 years.

How does the Smart Export Guarantee (SEG) work?

In the UK, the SEG (replaced the Feed-in Tariff in 2020) requires licensed energy suppliers to pay you for excess solar exported to the grid. Rates vary by supplier — Octopus Outgoing Fixed offers ~15p/kWh as of 2026, EDF/E.ON typically 5–7p/kWh. You need a smart meter and an MCS-certified install to claim.

Should I add a battery?

Batteries store daytime solar for evening/night use, raising self-consumption from ~30% to 70%+. They also enable cheap-overnight grid charging on tariffs like Octopus Go (7p/kWh) for arbitrage. Financially, batteries add 1–3 years to payback but significantly raise lifetime ROI for households with high evening usage and EV charging.

☀️ Solpanel Payback Lommeregner

Estimat residential solar PV cost, annual generation, savings, export income, payback period and 25-year ROI.

Region

Systemstørrelse (kWp)

Systemomkostning (installeret)

Grant / Tax CreditUK: 0% VAT (already in price). US: enter 30% of cost.

Generation (kWh per kWp/year)

Self-Consumption (%)No battery ~30%; with battery 65–80%.

Årlig Degradation (%)

Elpris (per kWh)

Export Tariff / SEG (per kWh)

⚠️ Estimat only. Real generation depends on roof orientation, pitch, shading, panel quality and weather. Inverter typically needs replacement at year 12–15 (~£800). Insurance and roof structure not modelled. Get 3 MCS / NABCEP-certified quotes before committing. Not financial advice.

Er sol det værd i 2026?

For de fleste UK-husholdninger med et sydvendt tag yes. Faldende panelpriser, stigende elomkostninger og en fungerende Smart Export Guarantee betyder, at tilbagebetalingstider nu er 6–10 år — efterlader 15+ år med effektivt gratis strøm fra et 25-årsgaranteret system. I USA holder 30% føderale skattefradrag (Inflation Reduction Act, løber til 2032) tilbagebetalingen under 9 år i de fleste stater.

Omkostninger (UK, maj 2026 — fuldt installeret, MCS-certificeret)

4 kWp: £6,000–£8,500
6 kWp: £8.500–£11.500
8 kWp: £11,000–£14,500
10 kWp: £14,000–£18,000
+ Battery (5–10 kWh): £4.000–£7.000

VAT på private solcelleanlæg er 0% i UK (til og med marts 2027). Det billige kinesiske panel + billige inverter-end af markedet starter ~£1.000/kWp installeret; premium-udstyr (LG, REC, SunPower, Tesla Powerwall) koster £1.800–£2.200/kWp.

How Much Will It Generate?

Tommelfingerregel for UK: 1 kWp = ~850–1,000 kWh/year (sydvendt, 30–40° hældning, ingen skygge). For et 6 kWp-system er det 5.100–6.000 kWh/år — ca. halvdelen til to tredjedele af en typisk UK-husholdnings 4.000 kWh forbrug.

Selvforbrug er multiplikatoren

The economics swing massively on what fraction of generation you use yourself versus export:

Use it yourself: fortrænger 28p/kWh import — fuld detailværdi
Export to grid: earns SEG ~15p/kWh (Octopus Outgoing Fixed, 2026)

Uden batteri vil en typisk husstand selvforbruge ca. 30% af produktionen; med batteri 65–80%. Ejere af elbiler og varmepumpehusholdninger kan ramme 50%+ selv uden batteri ved at flytte fleksible laster til daglys.

Smart Export Guarantee (SEG) — Bedste tariffer (UK maj 2026)

Octopus Outgoing Fixed: 15p/kWh (bedste generelle fast sats)
Octopus Outgoing Agile: half-hourly market price (averages ~12p, peaks at 30p+ in evenings)
Good Energy: ~5,5 øre/kWh
EDF Energy: ~5.6p/kWh
OVO: 4,0 øre/kWh

Du kan skifte SEG-udbyder uafhængigt af din importleverandør — det er værd at gøre.

Ting denne lommeregner ikke modellerer

Inverter replacement at year 12–15 (~£800)
Batteriudskiftning ved år 10–15 hvis installeret
Roof scaffolding / re-wiring if needed
Ejendomsværdistigning (typisk +1–4% for ejerboliger)
Indkomstskat på SEG-betalinger (HMRC behandler i øjeblikket domestisk SEG som ikke-skattepligtig for ejerbeboere)

⚠️

Vigtig bemærkning: Indhent altid tre tilbud fra MCS-certificerede installatører (UK) eller NABCEP-certificerede (US). Kontrollér garantierne for paneler (25 år), inverter (10–12 år) og udførelse (5–10 år). Bekræft, at dit tag kan bære lasten (ca. 18 kg/m²), og at dit sikringsskab/fordelerboks er kompatibelt. Godkendelse fra DNO (UK) eller forsyningsselskab (US) er påkrævet.

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