Fundamentals
Solar Energy Concepts
DIY Solar for UK Homes - Real Guides from a Real Installation
Step-by-step practical guides, component lessons, and hard-earned fixes from real UK DIY solar projects.
Latest Articles
Fundamentals
Plug-in Solar Buying Guide: What to Look For Before You Buy
- A £400 plug-in solar kit? You can build one for under £300 — two panels + G98-verified inverter, payback under 2 years.
- Use the kit builder to price your own system — only shows inverters confirmed on the ENA Type Test Register.
- Aldi and Lidl kits are coming — but you can build the same thing cheaper from UK suppliers today.
- Adding a £300 battery doubles your savings — capture 90% of generation instead of 40%.
Practical and DIY
Garden Solar Panels UK: Shed, Garage, and Plug-in Options (2026)
- Plug-in solar is the simplest shed option — one or two panels, a microinverter, plug into a socket. £300-500, ROI in 2-4 years.
- Full DIY gives more power — 4 panels + string inverter on a garage roof can cover your home base load.
- With a battery, ROI drops to under 3 years — store daytime generation for evening use.
- Part P applies: wiring a detached building still requires building regulations notification.
Fundamentals
Plug-in Solar Panels UK: What the New Rules Mean for You (2026)
- Plug-in solar is confirmed for the UK — the government announced legalisation in March 2026. Key dates: April 15 (wiring rules), July (product standard), October (transition ends).
- Balcony solar = plug-in solar — same technology, same rules. The UK term is plug-in solar; Europe calls it Balkonkraftwerk.
- 800W is the expected limit — the UK is expected to follow Europe’s 800W cap, but the BSI product standard is not yet finalised. How the three components work together.
- German kits are cheaper right now — but prices are rising after the China export rebate cut. What to check before buying.
- Vertical panels produce ~70% of optimal — placement and tilt matter more than brand. How angle affects your output.
- Use this guide before buying so your kit remains compliant and export-ready when the rules land.
My Components
Solar Panel Optimisers UK: Tigo vs SolarEdge vs Microinverters (2026)
- Three ways to optimise — DC optimisers (Tigo, SolarEdge) and microinverters (Enphase, Hoymiles) each suit different roofs and budgets.
- On clean unshaded roofs, optimisers may not help — independent research shows they can slightly reduce output when there is no shading to recover.
- Microinverters are a serious alternative — for complex or heavily shaded roofs, they often match or beat optimiser setups.
- Choose by your situation — retrofit = Tigo, new SolarEdge system = SolarEdge, complex new build = compare microinverter quotes.
My Components
Fogstar 15kWh Battery: 3-Year Owner’s Review
- ~10% capacity loss after 3 years and 600 cycles. Well within the 4,000-cycle warranty. At this rate, 80%+ capacity at the 10-year mark.
- You can add a pack later, even at different cycle count. The BMS recalibrates. I did it, and the readings have since converged.
- How I charge: Octopus Go + Solar Assistant automation. Saves £1,668/year. The setup details are in this article.
- Honest drawbacks included. Winter balancing drift, BMS firmware update, and how the fix works.
Energy Utilisation
Octopus Export Tariffs: Rates, Comparison, and Which to Choose (2026)
- Outgoing Fixed (12p/kWh) is simplest and suits most solar-only homes.
- Agile Outgoing can outperform Fixed if you shift export into high-price windows.
- Flux (28.60p peak export) is best for battery owners who can discharge during 4–7pm.
Fundamentals
How Do Plug-in Solar Panels Work? Simple Guide for UK Homes
- Plug-in solar is simple in concept: panels generate DC, microinverter converts to AC, home uses it first.
- Safety and compliance still matter even for small systems.
- Understanding the flow helps avoid bad purchases and unrealistic savings expectations.
Fundamentals
Home Battery Storage Without Solar UK: Is It Worth It? (2026)
- Use the calculator to estimate your numbers based on your setup.
- Yes, it’s worth it. A 16.1kWh battery on Octopus Go pays for itself in 3.2 years — no solar panels needed.
- Save £5,200–£7,700+ over 16 years using cheap overnight electricity and discharging during peak hours.
- System cost ~£3,300 (battery + inverter + electrician). 0% VAT until March 2027.
- New in April 2026: BS 7671 Amendment 4 introduces Chapter 702 — the first UK wiring standard for home batteries.
- Best tariff: Octopus Go (7.5p overnight → ~28.5p peak = 21p spread). Start with battery, add solar later.