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Fundamentals

Core concepts and essential knowledge for understanding home solar systems, from panels to inverters.

Fundamentals

Home Battery Degradation: 3.5 Years of Real Data

Home batteries lose about 2 to 3% of capacity a year: a study of 21 German home batteries measured 2.2% a year for LFP. My three packs show 3.3% a year on their screens.
After 3.5 years my packs show 87 to 89 Ah of a rated 100 Ah: fourteen readings from three packs sit on one straight line against the cycle count.
The capacity on a battery screen is an estimate: at the same 52.4 V, my three packs showed 39%, 40% and 50% charge. Read the screen as a trend.
Read battery life in years, not cycles: at my pace, 4,000 cycles take 22 years, but my screens reach 80% in about six years.
My battery does more work every winter: its winter output grew from 6.1 to 10.2 kWh a day in three winters.
Buy about double the storage you think you need: wear and a 20% reserve both take a slice, and home use keeps growing.

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Fundamentals

Is Your Home Suitable for Plug-in Solar? The RCD Check

Not every home is suitable for plug-in solar, and the RCD decides it: a Type AC RCD on the socket circuit rules a home out; Type A, F or B passes if bidirectional.
You can read the type off the label in five minutes: a sine wave alone means Type AC; extra pulsed, ripple or DC marks mean A, F or B. Bidirectional rating usually needs an electrician to confirm.
A fuse box with no RCD is not damaged by a kit, but it gives you no shock protection: Electrical Safety First says inspect first.
Socket circuit only, no extension leads or adaptors: and above 960 W of panels, which some two-panel kits exceed, the maker must tell you to consider a professional check.
One device per household and under 3.68 kW across the property: both confirmed in the August 2026 G98 amendment, which says a second plug-in device “is not allowed”.
Ten lines decide it: if the first two fail, the right first purchase is an electrician’s visit, not a kit.

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Fundamentals

Can Your Energy Supplier Control Your Home Battery?

No UK rule lets a supplier control your home battery without your agreement, and no rule forces a battery to be remotely controllable at all.
The draft 2027 smart mandate covers electric heating, not batteries: the government explicitly declined a battery mandate, keeping only a reserve power.
Nothing applies to kit already on your wall: the draft rules bind manufacturers at the point of sale, with replacements exempt to end-2029.
Real control today is contractual: Zero Bills makes battery control a condition of the £0 guarantee, and Charge Pack has no per-session opt-out.
You can always leave, at the scheme’s price: per published terms, quitting costs the guarantee, the £12 floor or the cheap rate; check your contract for notice and fees.

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Fundamentals

V2H vs Home Battery: Should You Wait or Buy Now?

You cannot practically buy V2H in the UK in mid-2026: the only announced route is Octopus’s V2G lease, reservations open from ~£299 a month.
The car’s 40-80 kWh pack is usually the absent one: Power Pack assumes 12 hours plugged in a day, 20 days a month, while a 5-15 kWh wall battery never leaves.
Measured AC V2G loses far more energy than a wall battery: 53-84% round-trip against 90-95% for stationary storage.
The warranty risk is paperwork, not physics: shallow V2G cycling adds minimal wear, but only Nissan explicitly approves named bidirectional chargers.
Buy the battery if storage solves a 2026 problem: 0% VAT ends 31 March 2027, and the V2X standards consultation only starts by end-2026.

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Fundamentals

Sodium-Ion Home Batteries UK: Wait, or Buy LFP Now?

One sodium-ion home battery is actually on sale in the UK: Eleven Energy’s. The CATL headlines are EV and grid products, not home ones.
Sodium costs 2-3x more per kWh than LiFePO4 today: about £304/kWh against £109-137/kWh for a Fogstar rack, at 22 July 2026 retail prices.
The cold-weather edge barely matters in Britain: sodium keeps ~90% capacity at -20°C, but UK LiFePO4 packs now ship with built-in heaters.
You cannot drop sodium cells into an LFP rack: the 1.5-4.0V cell swing needs a sodium-aware BMS and a wide-window or vendor-matched inverter.
The 0% VAT window closes 31 March 2027 for both chemistries: an installed system bought after a hoped-for sodium price crossover carries 5% VAT.

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Fundamentals

What Can an 800W Plug-In Solar Kit Actually Power?

An 800W solar kit covers a typical UK home’s 200-400W base load: fridge, router, TV and lighting, while kettles and ovens stay on the grid.
High-power appliances stay grid-fed: kettles, ovens and showers draw far beyond 800W, so the kit only ever pays for its share while they run.
Expect £40-85 a year without a battery: 650-800 kWh of annual generation at 25-40% self-consumption, priced at 26.32p/kWh, the price cap rate from 1 October to 31 December 2026.
It gives you nothing in a power cut: anti-islanding shuts the inverter down within a fraction of a second of losing the grid, by design.
Socket connection is legal in Great Britain: it has been since 27 August 2026, the exact model must be listed as Compliant on the ENA register, and one device per household is the rule.

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Fundamentals

What Does a Solar Panel Warranty Actually Cover in the UK?

Every panel carries two different promises: a product warranty of roughly 10 to 25 years for physical defects and a performance warranty of 25 to 30 years guaranteeing a power floor, not your actual yield.
The exclusions decide real claims: improper installation, moved panels, tampered serial numbers and storm damage all sit outside the cover.
Labour, removal and scaffolding are yours to pay: manufacturers replace the panel but the documents consistently push removal and reinstallation costs onto the customer.
Performance claims need laboratory proof: a monitoring screenshot is not the contractual test, and several brands make you pay for testing up front.
Warranties survive a failed installer but not a failed manufacturer: insurance-backed guarantees cover workmanship for up to about ten years, not panel performance.
Consumer law runs in parallel: the Consumer Rights Act gives you up to six years against the seller in England and Wales, five in Scotland, and no warranty can remove it.

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Fundamentals

Is Home Battery Storage Zero VAT Without Solar? UK 2026

An installed standalone home battery is 0% VAT without solar until 31 March 2027: supply-only batteries you fit yourself stay at 20%.
The 0% is on the installation, not the box: buy a battery to fit yourself and the hardware still carries 20% VAT you cannot reclaim.
Retrofitting a battery to existing solar also qualifies: the same zero rate covers a battery added by an installer to panels you already own.
Zero rating is worth roughly £900 on a £4,500 installed battery: against the old 20% treatment, and about £225 against the 5% rate scheduled from April 2027.
The zero rate is scheduled to end on 31 March 2027: after which HMRC guidance reverts battery storage to the 5% reduced rate, not the old 20%.

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Fundamentals

Will My Solar Battery Work in a Power Cut? (UK)

A grid-tied solar battery shuts down in a power cut: you keep power only if a backup output was installed, wired and earthed for safety.
Check your own system in minutes: look for an EPS or backup output, a backed-up circuit, an earth rod, and a reserve setting in the app.
Backup needs several parts at once: a backup-capable inverter or battery system, a charged battery, safe grid isolation, and your chosen circuits wired to the output.
Three designs, rising in cost: a single backup circuit, an essential-circuits board, or a whole-home gateway that runs the house automatically.
Runtime is roughly usable kWh divided by load: a 0.3 kW essentials load runs about 15 hours on 5 kWh, but a few-kilowatt backup output cannot run an electric shower.
A backup output is not a UPS: the switchover gap can reboot computers and some routers, so add a UPS for anything that cannot blink.

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Fundamentals

Does an Outdoor Socket Make Plug-in Solar Legal?

An outdoor socket does not make plug-in solar legal: the weather rating was never the rule. Since 27 August 2026 the kit decides it.
The new rules allow socket circuits only, and ban extension leads: a fixed outdoor socket spurred off a ring circuit fits that. A lead run out of a window does not.
Three rulebooks get blurred into one: Part P covers installing the socket, the wiring standard and SI 2026/848 cover the backfeed, and G98 covers notification. Only the first is a socket question.
One device per household, not one per circuit: G98 Amendment 1 confirmed that in August 2026. Adding 800 W to an existing 3 kW array pushes the whole property from G98 into a G99 application.
120 kits were listed Compliant on 10 October 2026: City Plumbing, Argos, Wilko, Homebase, Very and Screwfix all range listed kits, from £336. The Amazon look-alikes and the battery kits are still not covered.
Do the slow part first: have the outdoor socket fitted on a socket circuit, check the RCD type on that circuit, then buy a kit whose exact model is listed Compliant on the ENA register.

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Fundamentals

Octopus Nook: What the Plug-in Home Battery Actually Is

Octopus Nook is a plug-in home battery range: the 2 kWh Cube needs no installer, the Colossus stacks to 30 kWh; UK launch 2027, price not announced.
Compared with hardwired, DIY rack and Powerwall options: the Cube is the only announced plug-in path; capacity, install and backup differ sharply.
Charging from a socket is legal today; the Cube’s discharge method is not disclosed: a battery draws power out of a socket like any appliance, but Octopus has not said how the Cube feeds power back, so the full method cannot be checked yet. Plug-in solar, which pushes generation into a socket, became legal in Great Britain on 27 August 2026 for kits listed Compliant on the ENA register.
The “two or three years” payback is a launch claim, not a fact: a fully cycled Cube saves £100 to £120 a year depending on your tariff, implying a £200 to £360 price that no finished battery currently sells for.
2 kWh covers an evening baseload, not a home: about 1.3 to 2 hours at a typical 1 to 1.5 kW evening baseload, which is why the Cube stacks to 10.5 kWh.
Price, full specs, and the manufacturer are undisclosed: Octopus has not said who builds the Nook hardware or what month in early 2027 it arrives.

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Fundamentals

Plug-in Solar Rules Across Europe (and What the UK Is Copying)

Plug-in solar is legal across much of Europe: Germany alone has 1.2 million registered systems, on an 800 W inverter cap and one online form.
The UK legalised socket connection on 27 August 2026: that covers Great Britain, not Northern Ireland. On 10 October 2026 the ENA register listed 120 compliant kits, and the limit is one plug-in device per household.
Every country where plug-in solar actually took off shares three things: an official product safety standard, a one-step registration process, and (in the stronger examples) a legal right for renters to fit one.
The details vary sharply across Europe, from France’s no-export promise and Belgium’s approved-kit list to Switzerland’s stricter 600 watt cap and Lithuania’s flat cash subsidy for installing one.
The UK spec lands where Germany did: 800 VA limit, up to 2,000 W of panels, BS 1363 plug with 5 A fuse. The government confirmed that specification on 16 July 2026 and the law has been in force since 27 August 2026. Only a kit listed as Compliant on the ENA register may go into a socket.
German 2-year payback posts usually include free export: UK DIY plug-in kits should assume £0 export income.

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Fundamentals

Do Solar Panels Work Well in the Heat?

Heat reduces output; light raises it: about 0.26-0.30% power loss per °C above 25°C cell temperature.
A hot UK day costs about 8-10%: cells can reach ~56°C while summer irradiance still delivers the year’s best kWh.
Summer still wins: daylight dominates the heat tax; see monthly output.
Cold and bright is best: my own peak moments came on cool clear May mornings, not heatwaves.

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Fundamentals

Is Plug-in Solar Legal in the UK? Rules, Kits & Limits (2026)

Plug-in solar is legal in Great Britain since 27 August 2026: 120 kits are listed Compliant on the ENA register, and City Plumbing, Argos, Wilko, Homebase and Very all sell them, from £336.
Only listed models count: the Amazon kits with a UK plug are unlisted or Non-compliant, and battery kits are excluded by the law itself.
Not every home is suitable: the IET and Electrical Safety First say a Type AC RCD rules a home out, and only 25% of adults know which type they have.
One device per household is now written into G98: the August 2026 amendment says connecting more than one “is not allowed”, so the per-circuit relaxation did not happen.
Realistic savings are £43 to £84 a year, not the government’s “up to £110”: 650 to 800 kWh, 25 to 40% self-consumed, £0 export. Payback 5 to 10 years on the £444 two-panel kit. Octopus kit buyers can export at 9p, worth about £35 to £55 more.
Already have roof solar? The 3.68 kW limit is cumulative per property, and G98 now says so for plug-in kits in terms.
England sets planning limits too: a kit on a wooden balcony, wall or fence, or on a listed building, gets no automatic planning permission.

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Fundamentals

Myths About Solar Debunked: Solar Energy Facts vs Fiction

Plug-in solar has been legal in Great Britain since 27 August 2026: 120 kits were listed Compliant on the ENA register on 10 October 2026, and City Plumbing, Argos, Wilko, Homebase and Very all sell them, from £336, but the Amazon look-alikes are not covered and a Type AC RCD rules a home out.
Cloudy days do not switch panels off: they still produce 10-25% of rated output, and cloudier Germany got about 12% of its electricity from solar in 2023.
Modern panels lose about 0.4% of output a year: leading manufacturers now guarantee 87-90% of original capacity at year 25.
You no longer need £5,000 to start: a listed plug-in kit costs from £336, and it has been legal to plug into a socket since 27 August 2026.

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Fundamentals

Plug-in Solar Kits UK: Cost & Buying Checklist (2026)

You can buy a compliant plug-in solar kit now: 129 were listed on the ENA register on 6 November 2026, and City Plumbing, Argos, Wilko, Homebase and Very range them, from £336.
The cheap Amazon look-alikes are the trap: apart from Modular Solar’s own units, none I found was listed Compliant on 22 September 2026, and battery kits sit outside the law’s own definition of a plug-in microgenerator.
Compliance is a register listing plus six limits: 800 VA and 3.5 A from the inverter, 2,000 W of panels at STC, a moulded plug with a 5 A fuse, no extension lead, and no battery.
Budget £43-84 a year and a 5 to 10 year payback on the £444 two-panel kit: 650-800 kWh at 25-40% self-consumption and 26.32p/kWh, the price cap rate to 31 December 2026. Export income is £0 unless you have the Octopus kit and Octopus supply.
A Type AC RCD rules your home out until an electrician changes it: Electrical Safety First lists Type A, F and B as suitable, and the device also has to work with power flowing both ways.
City Plumbing, Argos, Wilko, Homebase and Very range listed kits: Lidl, Aldi, B&Q and IKEA had none on 10 October 2026.

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Fundamentals

How Plug-in Solar Panels Work in UK Homes

Plug-in solar feeds 230V AC into a socket: your appliances use it first, so self-consumption decides what you actually save.
Your breaker cannot see the solar current: a kit injects power downstream of it, so a cable can carry more than its rating while the breaker sits under its trip point. That, not shock risk, is why the law caps plug-in solar at 800 VA (3.5 A) and one device per home.
If you already have solar, adding 800W is not a plug-in job: the 3.68 kW G98 limit is cumulative across the property, so a 3 kW array plus a kit drops the whole house into G99 and a formal application.
Legal in Great Britain since 27 August 2026: the ENA register listed 120 compliant kits on 10 October 2026, the rule is one device per household, and not every home is suitable because the RCD in your consumer unit decides it.
800W covers a home’s 200-400W daytime base load: a clipped kit makes roughly 650-800 kWh a year, worth about £40-85 without a battery.
The plug pins go dead in a fraction of a second: the specification requires them below 34V within 100 milliseconds of losing the grid, which is why nothing works in a power cut.

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Illustration 16:9: A stylish living room setting with a prominent home energy battery subtly integrated into the design. The background transitions from a deep hue to a lighter shade. Abstract art motifs symbolizing energy and efficiency are present, along with subtle icons representing cost savings.

Fundamentals

Home Battery Storage Without Solar UK: Costs, Savings & Payback

Home battery storage without solar pays about £730 a year on Octopus Go: a £3,300 system back in about 4.5 years modelled, nearer 5.5 to 6 in practice.
On a single-rate tariff a battery LOSES about £127 a year: there is no cheap window to charge in, so you buy at 26.11p and lose a tenth of it to round-trip losses.
Octopus Go pays 9.5p between 00:30 and 05:30: Intelligent Go is cheaper at 8p over six hours but needs a compatible EV or charger to qualify.
Plan on 80% of the modelled saving: 300 to 330 real cycles a year, not 365, and winter days that overflow a 12.9 kWh usable pack.
GivEnergy went into administration on 9 April 2026: warranties and app support will not be honoured, so route any issue through your original installer.

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Fundamentals

Solar Panel Prices UK 2026: Panel, System & DIY Costs

Mainstream N-Type panels cost roughly £62-79 ex VAT in mid-July 2026: current JA Solar, Jinko and LONGi listings sit around 12.9-15.8p per watt.
A 4kW system costs £6,000-8,000 installed, or £1,500-1,800 in DIY parts: the official 2025/26 installed median fell to £1,780 per kW, a real-terms record low.
Installed systems pay 0% VAT, DIY buyers pay 20%: the zero rate only applies when one company supplies and fits, and it runs until 31 March 2027.
Matched mainstream panel prices fell 3.6% from April to July: the fixed six-panel median moved from 14.88p/W to 14.35p/W.

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Fundamentals

Solar Energy and Heat Pumps: A Strategic Home Investment

Energy Efficiency
Financial Incentives
Future-Proofing

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Fundamentals

What Changes When You Install Home Solar

Solar changes how you use energy — you shift heavy loads (washing, cooking) to daytime when generation is free.
Real savings from behaviour change on top of the system’s automatic savings.
Battery makes it effortless — without one, you are constantly timing appliances around the sun.

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Fundamentals

What Is a Solar Inverter? How They Work, Types & Cost (UK)

A solar inverter turns the DC your panels make into the AC your home runs on: no inverter, no usable solar electricity.
Hybrid vs string vs microinverter is a design decision, not a brand choice: pick wrong and adding a battery later can mean replacing the inverter.
Hybrid prices have fallen hard: 3-8kW hybrids now retail at £770-£1,600 and 3-6kW strings from £282 (1 July 2026 supplier crawl).
Connecting an inverter is notifiable electrical work in the UK: budget £250-plus for the electrician and expect a type C RCBO on its own circuit.

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Fundamentals

Are Solar Panels Worth It in 2026? 12-13 Year Payback (Who Should Skip)

A 4kW system at about £7,000 pays back in about 13 years for high self-use homes, then delivers roughly nine years of much lower effective unit cost after payback.
Skip solar if heavy shade, a north roof, under 6kWh/day use, or a move inside 5 years stretch payback past the point of sense.
Self-consumption decides the result: using your own solar saves 26.11p/kWh on the cap to 30 September 2026; exporting it can earn as little as 5p.
A battery lifts self-consumption to 70-80% and usually beats panel-only setups on total returns.

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Fundamentals

Solar Panel Essentials: From Sunlight to Power Production

Solar panels convert sunlight to DC electricity via photovoltaic cells. An inverter converts this to usable AC.
UK-standard panels: 430–490W, N-type TOPCon or HPBC cells, 22–24.5% efficiency.
Direction matters: south-facing produces ~978 kWh/kWp/year. East/west produces ~81% of that.
Panels last 25+ years with minimal degradation. The inverter and battery are replaced first.

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Fundamentals

Solar Panel Grants UK 2026: No Free Solar for Most, VAT, SEG and Means-Tested Help

July 2026: there is no universal free solar grant for typical UK homeowners – self-fund with 0% VAT and SEG is the normal path.
Scheme map: VAT (near universal), SEG (export pay), ECO4 and Warm Homes (means-tested), group buy (discount only).
Free solar is rare: only where ECO4 / Warm Homes / Nest eligibility and delivery actually include PV.
Ignore lead-gen “free panels” ads that harvest details without naming a real qualifying scheme.

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Fundamentals

Batteries for Solar Panels: Types, Sizing and Costs (UK 2026)

Most UK homes need 5 to 10 kWh of battery storage: your daily use and how much you shift off peak decide the number, not your roof.
AC-coupled or DC-coupled decides what you can retrofit: AC-coupled bolts onto solar that already works and loses 10-15% round trip; DC-coupled is 95-97% efficient but needs a hybrid inverter.
Only one UK brand publishes a checkable price: Fogstar Energy at £109-121 per usable kWh (24 July 2026), against roughly £700-780 per kWh for an installed all-in-one. Everything between is inferred.
Check the C-rate before the capacity: a 5 kWh battery at 0.5C delivers 2.5 kW, which runs lights and a fridge but not an oven.
GivEnergy went into administration on 9 April 2026: warranties and app support are not being honoured, so treat any remaining stock as unwarranted.
The whole case is one spread: 26.11p/kWh to buy against 12p at best to export, so every stored kWh is worth the difference.

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Fundamentals

Choosing a Solar Inverter: Hybrid vs String vs Microinverter (2026 UK Guide)

Choosing a solar inverter comes down to three types: hybrid for most UK homes, string for the cheapest clean roof, microinverters for shade.
Hybrid is the default because it keeps the battery option open for around £200-300 more than a basic string unit, and it covers both G98 and G99 connections.
String inverters are simplest and cheapest on a clean unshaded roof, and only when you are certain you will never add storage, because you cannot upgrade an inverter later.
Microinverters earn their keep on awkward roofs with shading or three or more orientations, since one shaded panel no longer drags the whole string down.
Decide the type before the model: then check DNO limits, MPPT voltage window, battery compatibility and export control against your shortlist.

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Fundamentals

Your Guide to Home Solar Energy: DIY and Professional

Start with your goal, not the hardware: bill reduction, resilience, DIY learning, and export income lead to different system designs.
Roof direction and shading decide the first cut: a simple south-facing roof is easy; mixed, shaded, or small roofs need more design work.
Batteries change the economics by moving solar or cheap-rate electricity into expensive evening hours.
DIY can save money, but compliance still matters: inverter certification, DNO notification, isolation, and safe wiring are not optional.

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An image of a wall with solar panels from the ground up. On a nice sunny day.

Fundamentals

Wall Mounted Solar Panels UK: Vertical Mounting Guide (2026)

Vertical wall mounted solar produces about 290 kWh/year per 400W south-facing panel in the UK, roughly 30% less than an optimal roof mount.
Wall wins when the roof is full, shaded, or wrong-orientation, or when you want better winter sun on a vertical face.
DIY vs installer is a safety and compliance choice, not only a cost choice.

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Eco-Friendly Redbrick House with Solar Panels in Simplistic Design

Fundamentals

Guide to Optimal Solar Panels Wiring for Expanding Strings

Use the calculator to estimate your numbers based on your setup.
Series wiring adds voltage — use when panels face the same direction and have similar specs.
Parallel wiring adds current — use when panels face different directions or have mismatched specs.
Check your inverter limits: Voc per string must stay below max input voltage, Isc must stay below max input current.
Mixed panels? Match Imp (current at max power) for series, match Vmp (voltage at max power) for parallel.

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Fundamentals

Solar Panel Angle Calculator UK: Best Tilt, Direction & ROI

Use the calculator below to compare tilt, direction and 10-year ROI for your roof. It covers every UK region; the optimal angle barely changes across a postcode area.
The textbook optimum is 35-40° facing south, but east-west and even vertical setups beat it for many real households.
Flat roofs win summer, steep walls win winter. Match the angle to when you actually use power.

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Fundamentals

Overpaneling in the UK: DC/AC Ratio, Benefits, and Limits (2026)

Overpaneling increases UK annual yield, especially in winter and low-light conditions.
The key metric is DC/AC ratio — oversize within inverter and DNO limits.
Done correctly, it improves ROI without automatically requiring a bigger inverter.

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Fundamentals

Solar Cable Connectors: Safe PV Wiring Guide

MC4-type connectors are the usual solar DC joint: locking shells, polarised inserts, outdoor seals.
Common mistakes: unmating under load, mixed brands, bad crimps, non-UV cable, water in the shell.
Safety: isolate DC before disconnecting; DC arcs do not self-clear like AC.
Use genuine matching pairs rated for your string voltage and current, not just parts that click together.

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Fundamentals

Mounting Solar Panels On A Tiled Roof: All You Need To Know

Hooks + rails + clamps map the full tiled-roof mount; each part has a clear failure mode if wrong.
This is not a DIY licence: height, rafter fixings, and consumer-unit work still have hard safety boundaries.
Hook type must match tile profile: plain tile, slate, pantile, and concrete all need different hooks.
Not only roofs: see the wall guide and shed or garage guide when tiles are not the right surface.

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Fundamentals

Solar Batteries in Series & Parallel: Concept Guide

Series and parallel arithmetic explains ratings: it does not show whether a complete battery arrangement is approved.
Two hypothetical 50V, 100Ah modules store 10kWh: their 10kW figure is theoretical and the inverter can limit output.
A 48V pack can still prohibit series: Pylontech’s US5000 manual forbids series connection for US5000 and US5000-B.
Battery arithmetic cannot size protection or cables: the complete design depends on equipment, routing, ratings, and manufacturer rules.
Charge differences do not prove a wiring fix: use the exact manufacturer procedure and installer assessment.

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Fundamentals

Solar Panel Optimisers: How They Solve Shading and Mixed Angles (2026 UK Guide)

Physics page: how power optimisers recover mismatch losses from shade and mixed angles.
NREL-style gains are largest under moderate shade (about 15-18%), not on clean roofs.
Uniform cloud is weak: optimisers can even cost a little efficiency when every panel is equally dull.
Buy companion: best optimisers brand comparison.

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