The SunSums Playbook

Your energy bill, cut in half the smart way: the right tariff, solar, a battery and an EV, explained by someone who's actually done it.

Thinking about solar panels, a home battery or an electric car? Or you already have them and suspect you're not getting the most out of them?

Most advice comes from salespeople or forum threads that are years out of date. The SunSums Playbook is different: a plain-English, UK-only guide written by a homeowner who went through all of it in 2026. It covers the real numbers, the questions to ask, and the settings nobody tells you about.

Inside you'll learn:

• The free saving most people miss: the right tariff for your setup. An EV driver can go from about £565 a year to about £150 to charge at home.
• Why your export rate matters: moving from a 4p to a 12p export tariff is worth £150–£250 a year with solar, for 10 minutes' work.
• How big your solar and battery should really be, what they cost in 2026, and honest payback times, not brochure ones.
• Charging an EV for about 2p a mile instead of 23p at a rapid charger.
• 12 questions to ask every installer, plus the red flags that cost people thousands.
• The battery settings that make the difference, season by season. Most systems ship set up wrong for smart tariffs.
• Four real-world examples showing what each step saves, and a 30-day action plan.

Bonus: the SunSums Savings Planner spreadsheet

Put in your own numbers to see your saving and payback, compare installer quotes side by side, and track what your system really saves month by month.

Why now? Solar panels and batteries are 0% VAT until 31 March 2027. After that the rate is due to rise to 5%, which is about £500 on a £10,000 system.

📄 26-page PDF (easy to read on your phone) + Excel spreadsheet

✅ Prices and tariffs checked October 2026

⚡ Instant download

General guidance for planning, not financial advice. Always get several quotes.