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Working through UK home energy questions in public: what pays back, what does not, and where the numbers come from.
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What solar panels costWhat a domestic solar system costs, what sits inside the quote, and why two quotes for the same roof can differ by thousands.7 articles
Payback: is it worth it?How long a system takes to pay for itself, how to work it out from your own bill, and the cases where the honest answer is no.9 articles
Home battery storageWhat storage costs per usable kilowatt hour, how to size one to your evening use, and when a battery earns its keep without solar.8 articles
Tariffs and exportWhat the Smart Export Guarantee pays, why export rates vary so widely, and why the tariff often matters more than the hardware.7 articles
Grants and fundingWhich solar funding schemes genuinely exist in each UK nation, who qualifies, and how to tell information from lead generation.7 articles
Buying and installingHow to read a solar quote, check an installer, handle planning rules, and get panels on a roof without overpaying.7 articles
How solar worksPanels, inverters and the rest of the kit, explained in terms of what each component does to the numbers on your bill.5 articles
EV charging at homeWhat charging at home really costs against public rapid charging, and what an electric car does to the case for solar and a battery.5 articles
Latest
comparisonChoosing a home EV charger
Scheduling and solar-matching are the two features that change what you pay. The rest is styling.
comparisonSolar roof tiles against conventional panels
Better looking, more expensive, less efficient per square metre. When that trade is worth making.
referenceThe network operator application, explained
G98 notification against G99 permission, which applies to you, and what a refusal looks like.
antipatternRent-a-roof solar: reading the deal properly
Free panels, someone else's asset. What the arrangement does when you come to sell.
referenceIntelligent Octopus Go: the EV tariff that schedules your car
A cheap overnight window plus supplier-controlled charging. What you give up for the rate.
referenceHow long does a solar battery last?
Cycle life against calendar life, and how to work out which one your usage will reach first.
conceptDo solar panels work at night?
No, and the question people are really asking is about storage. What actually covers your evening.
comparisonWhat a 6kW solar system costs, and who it suits
A larger array priced against the 4kW default, and the consumption pattern that justifies the step up.
referenceInstalling a home EV charger: cost and requirements
Supply capacity, notification and the survey question that decides whether it is straightforward.
patternSolar diverters: turning surplus into hot water
A cheap way to raise self-consumption without a battery, and when it beats one.
patternHow to choose a solar installer
Six checks that separate a surveyed quote from a templated one, none of which are about price.
antipatternSolar panel finance: what the monthly figure hides
Compare total repayable against the cash price, not the monthly payment against your bill.
referenceOctopus Agile explained
Half-hourly pricing that follows the wholesale market, and what that means when you also export.
calculationWhat a 10kWh battery actually covers
A larger unit against a typical overnight load, and the point where extra capacity stops cycling.
referenceDo solar panels work on cloudy days?
Diffuse light still generates. How much, and why a British climate is not the obstacle people assume.
calculationCost per kWp: the only figure that compares two quotes
Why the headline total tells you almost nothing, and how one division makes three quotes comparable.
calculationWhich EV tariff is cheapest for your mileage
The cheap window is only worth what you put through it. Work it out from your own annual miles.
comparisonSolar hot water against solar electricity
Two different technologies sold with one word. Which one suits a British house now.
referenceWhat happens on installation day
A scaffold, a roof crew and an electrician, in the order they arrive and what each needs from you.
referenceVAT on solar panels and batteries
Zero-rated in the quote rather than reclaimed by you, and what the relief actually covers.
referenceOctopus Flux explained: who it actually suits
A tariff built around a battery. What the three periods do and the setup that makes it pay.
calculationIs a 5kWh battery big enough?
The smallest common size, measured against a real evening's consumption rather than a spec sheet.
referenceDo solar panels work in winter?
Yes, and much less. What the seasonal curve actually looks like and what it means for a battery.
calculationHow many solar panels do I need?
Sized from your own consumption and usable roof area, not from bedroom count or a salesperson's default.
patternCharging your EV from solar: how much you can actually use
Why a 7kW charger and a 4kW array rarely meet, and the three things that close the gap between generation and when the car is plugged in.
calculationWhat charging an EV at home actually costs
Pence per mile on each common tariff, against public rapid charging, worked from figures you can read off your own car and bill.
referenceSolar panel maintenance: what it actually needs
Cleaning, monitoring and inverter replacement, with realistic lifetime costs and the checks worth doing yourself each year.
conceptSolar inverters explained: string, hybrid and micro
What the inverter decides, when paying more for one changes the return, and the question that settles which type your roof needs.
calculationSolar panel installation cost breakdown
Where the money actually goes: hardware, labour, scaffolding, certification and margin, and which of those scale with system size.
referenceDo solar panels need planning permission?
Usually not, under permitted development. The exceptions are listed buildings, conservation areas, flat roofs and ground mounted arrays.
referenceMCS certification: what it means and why it matters
What certification does and does not guarantee, why export payments depend on it, and how to check a registration properly.
patternHow to read a solar panel quote
Line by line, with the questions that expose an inflated generation estimate and the exclusions that turn up after you have signed.
referenceSolar panel grants in Northern Ireland
A different regulatory picture from Great Britain, and what it means for support, export payments and how you should model the return.
referenceSolar panel grants in Wales
What Welsh households can access, how the schemes are structured, and the eligibility conditions most easily misread from an English summary.
referenceSolar panel grants in Scotland
What Home Energy Scotland currently funds, what quietly closed for solar, and the supports every Scottish household still gets.
referenceSolar panel grants in the UK: what actually exists in 2026
Separating live schemes from expired ones and from lead generation, and the checks that tell you which you are looking at.
antipatternWhy your export rate matters less than your self-consumption
A unit you use is worth several times a unit you sell. Everything sensible about running a solar system follows from that one fact.
referenceOctopus Energy solar tariffs: what the numbers mean
How the outgoing, tracking and time of use options differ, and which generation and consumption patterns each one actually suits.
comparisonSmart Export Guarantee rates compared
What suppliers pay, the conditions attached to the headline numbers, and how to work out which offer is actually best for your household.
referenceSmart Export Guarantee explained: what you actually get paid
How the SEG works, who has to offer it, what you need in place to qualify, and why the rates on offer differ so enormously.
conceptBattery degradation: what you lose each year
Cycle life, depth of discharge and calendar ageing, and why storage warranties are written the particular way they are.
calculation10 solar panels and a battery: what it costs and what it returns
A worked end to end example with every assumption stated, so you can swap in your own figures and see which one carries the result.
calculationWhat size battery for your solar array
Size to your evening use, not to your array. A method using half hourly data, and why oversizing is the more expensive mistake.
patternHome battery storage without solar: does it pay?
Tariff arbitrage alone can justify a battery. When the spread between cheap and expensive rates makes the sums work, and when it does not.
calculationWhat home battery storage costs in the UK
Cost per usable kilowatt hour is the only figure that compares batteries fairly, and it is the one quotes are least likely to give you.
calculationHow to calculate your solar savings without a salesperson
A repeatable method using your own bill and meter readings, so the number belongs to you rather than to whoever wants the sale.
comparisonAre solar panels worth it in Scotland?
Less sunlight than the south of England, but not as much less as people assume, and installation prices that are genuinely lower per kilowatt.
calculationSolar panel payback period: how to calculate it properly
Why the headline figure on a quote is usually optimistic, and the arithmetic that corrects it without pretending to more precision than exists.
antipatternWhy solar panels are not worth it: five honest cases
North roofs, empty houses, short stays, cheap tariffs and expensive finance. The situations where the sums genuinely do not work.
patternAre solar panels worth it in the UK? Run your own numbers
The honest answer is conditional. Four inputs decide it for your home, and you can check all four from your own bill in about twenty minutes.
antipatternWhy two solar quotes for the same roof differ by thousands
Panel count, inverter class and margin you cannot see. How to normalise two quotes so the remaining difference means something.
comparisonSolar panel cost by house size: 2, 3 and 4 bedrooms
Bedrooms are a poor proxy for both roof area and electricity use. Here is what to size on instead, and how to get there from your own bill.
referenceThe cost of fitting solar panels: what is in the quote and what is not
Scaffolding, network applications, bird proofing, isolators. The line items that turn up late, and the ones a good quote states up front.
calculationWhat a 4kW solar system actually costs in 2026
The most common domestic size, priced from government installation data, with a worked savings example and the reasons the price band is wide.
conceptWhat the solar ROI calculator actually models
A plain description of what goes into the payback figure, what it leaves out, and why a single headline number is never the whole story.