Solar Energy Concepts

DIY Solar for UK Homes. Real guides from a real install.

Step-by-step practical guides, component lessons, and hard-earned fixes from a real UK DIY solar setup.

7.15kWpinstalled 6,072kWhgenerated 2025 £1,668/yrmodelled value

Latest field notes

Fundamentals

Germany has over 1.2 million registered plug-in solar systems, built on an 800 watt output cap, a single online registration form, and a safety standard that took nine years to publish.
The UK has decided to legalise plug-in solar, but the only lawful way to connect solar generation today is still a hardwired installation by a registered electrician notified to your network operator.
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 is published and lands where Germany did: 800 VA limit, up to 2,000 W of panels, BS 1363 plug with 5 A fuse. The consultation closed 30 June 2026; a government response is expected around 22 July. No kit can be plugged into a UK socket legally today.

Updated 1 Jul 2026 Read Entry →

My Components

Best DIY inverter in the UK — hybrid, 3.6kW AC, dual MPPT, battery-ready, G98 compliant. Around £750.
Owner since May 2023 — running two strings + 16.1kWh Fogstar battery + Solar Assistant automation.
Generator port trick: my system has processed 6.3kW of solar power at once by combining both PV strings with an extra inverter on the generator port.
Drawbacks: app data refreshes every 5 min (use Solar Assistant instead), CT clamp inaccurate beyond 15m, SOC reporting quirks with parallel batteries.

Updated 1 Jul 2026 Read Entry →

Fundamentals

Wall-mounted solar is viable where roof space, orientation, or structure is limiting.
Yield depends heavily on angle, shading, and seasonal sun path — design decisions matter more than aesthetics.
Use robust mounting and waterproofing standards to avoid long-term maintenance pain.

Updated 1 Jul 2026 Read Entry →

Fundamentals

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.

Updated 1 Jul 2026 Read Entry →

Fundamentals

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.

Updated 1 Jul 2026 Read Entry →

Practical and DIY

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.

Updated 1 Jul 2026 Read Entry →

Fundamentals

The inverter is the control centre that converts PV output into usable household power.
Hybrid vs string vs microinverter is a design decision, not just a brand choice.
Choosing correctly up front avoids expensive rework when adding batteries or expanding later.

Updated 1 Jul 2026 Read Entry →

Fundamentals

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.

Updated 1 Jul 2026 Read Entry →

Fundamentals

Hybrid inverters are the safest default for most UK homes because they keep battery, solar, and tariff optimisation options open.
String inverters are simplest and cheapest when the roof is clean, unshaded, and unlikely to need battery storage later.
Microinverters earn their keep on awkward roofs with shading, mixed orientations, small extensions, or panel-level monitoring needs.
Check DNO limits, MPPT voltage/current, battery compatibility, and export controls before buying, because the wrong inverter is expensive to unwind.

Updated 1 Jul 2026 Read Entry →