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Practical and DIY

Hands-on guides, real installation projects, and practical tips from lived DIY solar experience.

Practical and DIY

DIY Home Battery UK: What You Can Do Yourself

A DIY home battery is legal in the UK, but not a plug-in job: you can size, source and configure it. Fixed wiring and grid connection need an installer.
There are four rungs, and assisted DIY is the useful one: you choose the battery and inverter and keep control, while a professional designs, connects and certifies the fixed installation.
Fogstar rack batteries came to £109-121 per usable kWh on 24 July 2026: the only UK brand I can price first-party, against roughly £189 for reseller-reported Pylontech.
My own 15kWh Fogstar and Sunsynk system shows both sides: I control monitoring and automation, yet Solar Assistant still reports the wrong capacity register for these packs.
Do not DIY a closed premium system: approved commissioning, the gateway, app access and warranty responsibility are the product, not accessories around it.
Separate the rules from the commercial consequences: Building Regulations, the DNO route, MCS, SEG, VAT, warranty and insurance are related but decided separately.

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Practical and DIY

Storm-Damaged Solar Panels UK: Claims & Safe Checks

Roof panels sit under buildings insurance: tell your insurer about the array, or a related claim can be reduced or refused.
A storm has a working definition: gusts of 55mph, 25mm of rain in an hour, or a foot of snow in 24 hours. Insurers check local wind data against it.
Every useful check happens at ground level: zoomed photos, a screenshot of the generation drop, and inverter fault codes. Damaged panels can remain live, so stay off the roof.
“Wear and tear” is the classic refusal and independent evidence of pre-storm condition is your strongest counter, so keep dated photos and monitoring history.
Defective fitting is not a storm claim: absent extreme wind, clamp and mount faults go to the installer’s minimum 2-year workmanship warranty.

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Practical and DIY

Why Is My Solar Panel Output Lower Than Expected? A UK Diagnostic Guide

Benchmark against PVGIS, not hope: a good south roof yields roughly 850 to 1,150 kWh per kWp per year depending on where you live; within 5 percent of the estimate is noise.
The winter expectation gap causes most false alarms: December produces roughly a quarter to a third of June, and that is normal.
Verify the monitoring before blaming the roof: backwards CT clamps, dead comms dongles and kW versus kWh confusion all mimic faults.
A flat-topped sunny-day curve is usually design, not damage: UK systems deliberately pair more panel capacity than inverter rating.
High grid voltage mimics a failing inverter: a supply that breaches the 253 V statutory ceiling is a complaint to your network operator, and they must respond.
Sudden drops are faults, slow fade is ageing: panels lose about half a percent a year; one dead panel or a halved output has a hardware cause worth repairing.

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Practical and DIY

Solar Panel Repairs UK: What Actually Breaks and Who Will Fix It

Electronics interrupt generation, connections cause the safety risks: BRE traced around 30 percent of investigated PV fire incidents to DC isolators, with poor installation the leading root cause.
Check the app, error codes and breakers, never the DC side: panel wiring stays live in daylight and cannot be switched off.
Repairs do not require an MCS installer: any competent PV-aware electrician can legally do the work, and most repairs are not even notifiable.
Tell your DNO when an inverter is replaced: even a like-for-like swap is a standing notification duty under G98 and G99.
Access often costs more than the part: scaffolding is the line that surprises people, so ground-level faults are usually cheaper to fix than roof-level ones.
Match the fault to the right warranty layer: product, performance, workmanship, insurance-backed guarantee and consumer rights each cover different failures.

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Practical and DIY

Retrospective Building Regulations Approval for Solar Panels (UK)

Retrospective Building Regulations approval for solar panels is a regularisation certificate: apply to local authority Building Control, do not buy one after the fact.
The notifiable part was the electrical connection: “no building regs for the panels” almost always means the consumer-unit connection was never certified.
Regularisation is an inspection, not a purchase: the council can open up the work and require alterations before it issues the certificate.
Some evidence only a professional can produce now: an EICR from a registered electrician feeds the application; you cannot self-certify Part P work after the fact.
Doing nothing bites at sale: since October 2023 a section 36 notice can be served up to 10 years after the work was completed, and indemnity insurance is usually voided if you approach the council first.

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Practical and DIY

Selling a House with DIY Solar Panels: The Documents You Need

You can sell a house with DIY solar panels without MCS: hand over the electrical certificate, Building Regulations evidence, the DNO letter and any export agreement instead.
The electrical sign-off is the document that matters most: an EIC plus a Part P Building Regulations or Building Control certificate for the consumer-unit connection.
If it was never certified, fix it before you list: get an electrician to certify the work, apply for a regularisation certificate, or fall back to indemnity insurance.
The TA6 form asks about solar at question 5.6: you answer “owned outright” and attach the export agreement; no MCS number exists for a self-build.
The conveyancer and lender decide, not this checklist: a complete folder turns a sale-blocking enquiry into a five-minute one.

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Practical and DIY

Solar Panel Removal and Reinstallation Cost UK: What It Costs and Who Does What

Solar panel removal and reinstallation is three costs plus parts: access, panel handling and recommissioning, usually high hundreds to low four figures.
A re-roof with panels needs a roofer and a competent solar electrician: the mounting-to-roof interface is where leaks start if nobody clearly owns the weatherproofing.
Photograph and list every serial number before removal: it protects your warranty claim and proves the same hardware went back on.
A like-for-like lift is not a new installation: keep the original MCS certificate, and FIT or SEG payments follow it unless you change capacity, which needs an amendment through your installer.
Do not assume 0% VAT on removal and refit: the relief is written for installing panels, and roofing work is standard-rated, so get the treatment confirmed in writing.
Take a seven-question checklist to every quote: itemised costs, who holds BS 7671 competence, and who weatherproofs each roof anchor when the panels go back.

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Practical and DIY

Solar Panels on a Flat Garage Roof UK: Weight, Wind and Waterproofing Checks

Solar on a flat garage roof is usually possible, but it is a structural job first: the ballast holding the array down, not the panels, is what loads the roof.
Panels add about 15kg per square metre, ballast adds 30 to 60kg or more: the ballast is set by a site wind calculation, not a fixed rule, and is the load that grows on exposed plots.
Wind uplift is worst at the roof edges, so a small garage roof is nearly all edge; a low 10 to 15 degree tilt cuts the ballast a flat-roof array needs.
MCS MIS 3002 requires a structural engineer to assess the load on a ballasted flat-roof array: the panel-plus-ballast load can rival the roof’s entire code-minimum allowance, so do not judge it by eye.
Protect the membrane: seal every penetration to the EPDM, felt or single-ply type, and keep ballast clear of the drainage paths so water still reaches the outlets.
The checks are cheap next to the array: the ballast calculation usually comes free with the mounting kit, and a structural engineer’s assessment is typically a few hundred pounds.

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Practical and DIY

Solis OV-G-V01 Error: What a Grid Overvoltage Trip Means in the UK

Solis OV-G-V01 means the grid voltage crossed the inverter’s first overvoltage stage, about 262.2 V under UK G98/G99, so it shut down to protect the grid. The 253 V ceiling is the sustained statutory limit.
The number tells you the cause: OV-G-V01 is a breach of the first stage-one limit, OV-G-V03 is a sustained 10-minute average overvoltage.
Your inverter reads higher than the grid: exporting raises voltage across your own cable, which is why trips cluster at midday.
Check the voltage at rest to place the fault: high before you generate is the DNO’s duty to fix; high only under export points at your cabling.
Do not raise the protection thresholds: they are fixed by G98 or G99, and widening them lets you push an already-overloaded network higher.

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Practical and DIY

Sunsynk Octopus Flux Settings: The Windows That Actually Matter

Sunsynk Octopus Flux settings start with two windows: grid charge 02:00 to 05:00, then export across the 16:00 to 19:00 peak, both set by hand on the timer.
Force charge is a permission chain: enable grid charge on the 02:00 to 05:00 row, set the target state of charge, and keep it coordinated with the Low Batt protection floor.
Sunsynk’s live-price Flux feature is still beta: the Connect app can schedule Flux for you, but Sunsynk advises using it at your own risk.
Beta export blinds your load reading: Selling First mode disables the CT coil, so you cannot see house consumption while exporting until the firmware fix ships.
Deye uses the same platform: set the same two windows through Time of Use, since a Deye may not expose Sunsynk’s one-click Flux button.

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Practical and DIY

Add a Battery to Solar Panels Without Losing Your Feed-in Tariff

You can add a battery and keep your Feed-in Tariff if the generation meter, and any metered export, still records eligible solar correctly.
AC-coupled after the generation meter is the low-risk route: it leaves your certified PV system and its meter untouched, where a hybrid swap re-wires the generating side and has to be re-proven.
Deemed export stays at 50% of generation: solar PV up to 30kW keeps the 50% deemed rate even with a battery and a smart meter, because it is read off the generation meter.
Grid charging is allowed but must be metered cleanly: if a meter cannot separate exported solar from exported grid electricity, you lose the export payment.
Report the change to your Feed-in Tariff licensee: notifying co-located storage with a wiring diagram and battery details is a scheme requirement, not a courtesy.

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Practical and DIY

Can a DNO Refuse a G99 Application? Your Options

A DNO can refuse a G99, but only on narrow grounds: its duty to connect means most “no” answers arrive as a capped export offer, not a flat rejection.
Sort the decision into five outcomes: returned for fixes, offered as applied, capped on export, subject to works, or the requested arrangement declined.
An export cap only limits the surplus you send back: accepting it and self-consuming more is usually cheaper than lifting it, and it does not block a later application.
As a final demand site your home rarely pays wider reinforcement: Ofgem’s April 2023 Access SCR moved those costs onto DNOs, below a £1,720/kVA high-cost cap.
Three dispute routes if you think it is wrong: a DNO complaint, the free Energy Ombudsman, then a statutory Ofgem determination under the Electricity Act 1989.

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Practical and DIY

DNO Offered a Lower Export Limit: What to Do Next

A lower DNO export limit caps the kW you push to the grid at once, not by itself your array or inverter size, which the offer may cap separately.
Keep the three numbers separate: array kWp, inverter kW and export limit are different, and only the export limit was reduced.
Accept the cap and self-consume: a battery or well-timed loads soak the midday surplus a low limit would otherwise clip.
Model the cost before you fight it: for a 6 kWp array behind a 3.68 kW cap the clipped export is often only 100-200 kWh, roughly £15-30 a year.
Or ask the DNO for more: reinforcement, three-phase or a flexible connection can lift the limit, each with a cost or a wait.

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Practical and DIY

Where Can a Home Battery Go in a UK House?

A home battery belongs in a garage, outside or a fire-separated utility room, not a loft, bedroom or escape route: PAS 63100:2024 and BS 7671 Amendment 4 set the rules.
A loft is expressly excluded: PAS 63100 rules out lofts, roof spaces and voids, and joist loading and summer heat make the case worse.
Outside is the preferred spot: it keeps a fire off the living space, but the enclosure must sit 1 m from windows and doors, 2 m from stored fuel, and cope with winter cold.
Indoors needs fire separation, ventilation and detection: a utility room with about 30 minutes of fire separation works; a sealed cupboard, bedroom or hallway does not.
Make the installer justify the location in writing: the exact spot, its fire separation in minutes, ventilation, Grade D2 detection and the manufacturer temperature limits, before you sign.

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Practical and DIY

Solar Panel Bird Proofing: Is Mesh Worth It in the UK?

Solar panel bird proofing is usually worth fitting: clip-on mesh around the array stops pigeons nesting in the gap, often advertised around £300 to £900 fitted.
Fit it at install time if you can: it is cheapest while the scaffold is already up, so ask for it as a written line item on a new install.
Keep it clip-on, not drilled: mesh that grips the frame leaves no roof damage; drilling the panel frame voids the warranty and needs a roofer.
Check for an active nest first: intentionally sealing mesh over a nest in use is an offence under the Wildlife and Countryside Act 1981.
Access is the real cost: materials are cheap; the price is driven by roof height and safe access, not the mesh itself.

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Practical and DIY

Do I Need Structural Calculations for Solar Panels? (UK Roof Load)

Do you need structural calculations for solar panels? Usually not for a sound standard pitched roof, but flat, hipped or damaged roofs need an engineer.
Using an MCS installer? The structural check is their job, not yours: Part A of the Building Regulations makes safe roof loading a legal duty, self-certified by a scheme-registered installer or proven through a Building Control application if you go DIY.
Calculations commonly cost £150 to £500 and take a couple of days: find a chartered structural engineer through the IStructE directory and agree a fixed fee before you commit.
A rail-mounted array commonly adds around 15 kg per square metre: but wind uplift and snow, not static weight alone, are what an engineer actually assesses.
Give the engineer the full pack up front: roof pitch, rafter size, span and spacing, covering, panel datasheet weight, mounting and postcode, to avoid a second visit.
Settle the roof evidence before you buy the panels: an engineer may cap the array or require strengthening you would rather know about first.

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Practical and DIY

Solar Assistant Setup for Sunsynk and Deye

Solar Assistant is local Pi monitoring, not a cloud app replacement for glances: real-time data and optional control on your LAN once the link is healthy.
Pick exactly one official connection method: RS485, RS232 where documented, or a supported logger path. Simultaneous methods can give partial or corrupted reads.
If the battery already owns the combined CAN/RS485 port, plan that before you buy: use a documented 2-in-1 or purpose-built split, not a random Ethernet splitter.
Commission by proving power, SOC and grid match: do not start automation until live values agree with the inverter display or app.
Route failures before rewriting settings: CRC and wiring go to the CRC guide; rules and tariffs go to the automation guide.

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Practical and DIY

Sunsynk and Deye Inverter Settings Explained

Sunsynk timer SOC depends on Grid Charge: with it selected the row can be a charge level; without it, discharge towards that level may be allowed.
Find the binding constraint: source-specific current, timer Power, BMS requests, equipment limits, available energy and time can all restrict battery power.
Priority Load and Priority Battery change where solar goes: a timer SOC is not a universal cap on solar charging.
Diagnose in a fixed order: identify the active row and source permissions before changing current limits or protection values.
Keep protection and compliance settings out of experiments: grid code, CT wiring, battery protocol and firmware need the exact manual or an installer.

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Practical and DIY

Scaffolding for Solar Panel Installation: When You Need It and UK Costs

Most pitched-roof solar installations need scaffolding: the decision depends on height, roof pitch, access and how long the work takes.
A simple domestic scaffold typically costs a few hundred pounds: complex access, extra elevations and longer hire periods can take the cost into four figures.
The law requires commercial roof work to be properly planned: the duty includes choosing equipment that prevents falls where reasonably practicable.
Towers and roof ladders have limited uses: neither automatically provides the protected working platform needed for a full solar installation.

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Practical and DIY

You Have Solar Panels – Now What? A UK Post-Installation Checklist

Confirm the DNO paperwork is complete: keep the G98 acknowledgement or G99 approval and commissioning records.
Register for a Smart Export Guarantee tariff: export payments do not start automatically after installation.
Set up generation and consumption monitoring: save an early baseline so you can recognise faults and changing usage.
Judge the system through its first winter: compare trends and alerts, not winter output against summer peaks.

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Practical and DIY

Council Solar Group-Buying Schemes: The Full UK List

Council solar group buying is real and low-hassle: hundreds of households register together, installers compete in a reverse auction, and you get a vetted, fixed-price, MCS-certified install without chasing quotes yourself.
The MCS certificate is the real win, not just the discount: it’s what lets you sign up to a Smart Export Guarantee tariff and get paid for surplus power. A true DIY self-install without MCS can’t access SEG at all.
Budget six to nine months, not weeks: register, auction, personalised offer, a separate acceptance deadline, technical survey, then install. Real homeowner timelines on MoneySavingExpert show this spread.
You’ll pay roughly 20 to 40% off retail list prices, but that’s off full retail, not off a quote you’ve haggled down, so get one independent quote to benchmark.
The full UK list by region, plus the blank spots: Scotland, Northern Ireland and the North East have no scheme at all, so look at grants and loans instead.
Push for more panels and a bigger battery up front, and ask for a G99 connection if you’re sizing up. Retrofitting a battery later is fiddly, so get the spec right before you accept.

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Practical and DIY

Can You Legally Install Solar Panels Yourself in the UK?

DIY solar is legal in the UK, but the connection to your consumer unit is notifiable electrical work: a registered electrician certifies it, or Building Control inspects it.
Going DIY costs you MCS, which means no SEG export payments from most suppliers (Octopus Outgoing aside) and 20% VAT on parts instead of 0%.
You can still do plenty yourself: the panels, the racking, the DC side and your own G98 or G99 notification. This is my read of the rules, not legal advice.

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Practical and DIY

Garden Solar Panels UK: Shed, Garage, and Plug-in Options (2026)

Check G98 headroom first: a 4-panel garage array usually fits under 3.68kW AC if it is the only inverter on site.
Hardwire, do not plug in: shed solar needs its own breaker via a registered electrician. Socket kits are not legal yet.
Prefer AC cable runs from a local inverter to the house consumer unit over long DC strings.
With a battery, ROI can fall under 3 years on a well-used base load.
A summer house used as an office pays back faster because daytime load matches generation.

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Practical and DIY

How To Upgrade Your Solar from 3.6kW to 5.6kW

G98 covers up to 3.68kW. Beyond that, you need a G99 application to your DNO.
G99 is an application, not a notification — expect 30–60 days for approval depending on your DNO region.
You need a single-line diagram (SLD) showing your full system layout. Templates and examples included.
DIY systems can apply for G99 — you do not need an MCS installer for the application itself.

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Bar chart displaying electricity export data over time, with peaks indicating higher export volumes on certain dates.

Practical and DIY

How to Export DIY Solar Energy with Octopus (No MCS): UK Guide 2026

Yes, DIY solar can export without MCS via Octopus when you meet its evidence bar; most other suppliers still require MCS.
Register in order: DNO letter first, then Octopus form, fee, certificates, export MPAN, tariff live.
A DNO letter is not an export MPAN: generation registration and export metering are separate steps.
Documents that matter: G98/G99 confirmation, EIC, Building Regulations evidence, smart meter, system details.
Expect weeks, not days, for the export MPAN after documents clear (operational expectation as of July 2026, not a guaranteed SLA).
Common failures: missing DNO paperwork, certificate gaps, meter issues, and treating the beta route as guaranteed.

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Practical and DIY

Can You Add Microinverters to Older Solar Panels? UK 2026

Yes, you can add microinverters to older solar panels: if the cold-corrected voltage clears the 60V ceiling and an electrician certifies the AC side.
Check the old panel, do not assume it: a 60-cell panel near 38V keeps plenty of margin, but an older 72-cell panel at 45 to 46V can climb close to 60V once cold-corrected.
Compare micro add-on, second string, and hybrid replace before buying; consumer-unit space and aggregate G98/G99 capacity decide the route.
Aggregate capacity, not export, sets the grid route: cross 3.68kW per phase and you need a G99 application and the DNO’s written permission before you connect, not a notification.
Charge a battery from the new panels only through a hybrid AC input that accepts AC-coupled generation; otherwise the micros just offset daytime loads.
Micros cost most on a healthy unshaded array: eight panels means eight units plus a gateway, against a few hundred pounds for one AC-coupled string inverter, which is the route I took.

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Practical and DIY

The DIY Solar Panels System I Would Build in 2026

This is the exact DIY system I would build in 2026 based on real install experience.
Component picks are updated for current UK pricing, availability, and performance.
Includes inverter, panel, battery, and accessories with practical trade-offs.

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Practical and DIY

Forecast Solar and Battery Charging. Easy Win at Winter

Automate battery charging using Solar Assistant, PV forecasts, and overnight tariff rates to maximise winter savings.
Simplest setup: charge from grid overnight on Octopus Go at 9.5p/kWh between 00:30 and 05:30, discharge during peak hours.
Advanced: use Forecast.Solar API + Solar Assistant rules to decide whether to charge from grid or wait for solar.
Works with Sunsynk and Deye inverters via MQTT control through Solar Assistant.

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How to Extend a CT clamp for Sunsynk and Deye Inverters. Go beyond the 15m limit with this DIY hack!

Practical and DIY

The Little Known Sunsynk and Deye CT Clamp Extension Hack

Sunsynk CT clamp accuracy drops beyond 15 metres of cable — signal attenuates over distance.
Budget workaround: extend the cable and calibrate the offset in Solar Assistant config.
Proper fix: install a dedicated energy meter (e.g., Eastron SDM230) closer to the consumer unit.
Why it matters: inaccurate CT readings cause the inverter to export when it should not, or import when it has stored energy.

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Practical and DIY

Fix the Weird Solar Assistant CRC Error on Sunsynk and Deye

CRC errors on Solar Assistant usually mean the RS485 cable is too long, poorly terminated, or picking up interference.
Fix: shorten cable, add 120Ω termination resistor, use shielded twisted pair cable.
Affects Sunsynk and Deye inverters connected via Modbus RS485 to Solar Assistant.

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A person installing solar panels on the red-tiled roof of a brick garage, with two ladders propped against the side. The person is seated on the roof under a partly cloudy blue sky in a residential neighbourhood.

Practical and DIY

DIY Solar Installation: A Journey to Energy Independence

Accessibility
Cost-Effective
Sufficient Space
Solar Panels
Inverter

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Solar gazebo from the side on a sunny day

Practical and DIY

Solar Expansion With Added Value: DIY Solar Gazebo

Honest verdict: a solar gazebo is expansion with garden value, not a free lunch on yield per panel.
My build: about £2,018 including tools for 3.28 kWp on a ~6° flat roof structure.
Flatter tilt means more panels and more cleaning where water ponds on the frame edge.
Compare roof and ground first if height safety and planning allow a better tilt.

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Practical and DIY

DNO Registration for DIY Solar UK: G98 and G99 Step-by-Step (2026)

DNO registration is G98 or G99 for generation: export payments still need a supplier process and usually an export MPAN.
3.68 kW AC single-phase is the usual G98 boundary: above that, apply for G99 before you install.
Keep a clean document pack: MPAN, inverter type-test, single-line diagram, DNO letter, EIC and Building Regs evidence.
After the DNO letter, fork to export: Octopus DIY export without MCS.
Most delays are preventable: wrong MPAN, unlisted inverter, missing diagram, or treating DNO approval as an export tariff.

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4117W from a 3.6 inverter. How? Thumbnail.

Practical and DIY

Unlock Hidden Power: How Your Sunsynk 3.6 Inverter Can Process Double the Solar Energy

The Sunsynk 3.6kW can accept higher DC input than many owners realise, within limits.
Correct design and settings matter — otherwise potential yield is left on the table.
This guide explains practical configuration for better generation and export outcomes.

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Practical and DIY

Take Total Control of Your Sunsynk With Solar Assistant Rules

Solar Assistant + Sunsynk automation: Schedule charge and discharge current limits your inverter’s native app can’t handle.
Force solar export: Drop Max Charge Current to 2A during the day so surplus solar goes straight to the grid on Octopus Go.
Real UK export data: These rules helped double grid export from 1,766 kWh to 3,914 kWh year-on-year.
Crash-proof your setup: Never set amps to zero. Solar Assistant can crash and leave values stuck.
Home Assistant solar integration: Bridge Sunsynk data via MQTT for Octopus Agile pricing, solar forecasts, and EV diversion.

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