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The Month the Grid Paid Me to Fill the Battery
April 2026: 142 negative half-hours, 223 kWh imported at 3.91p — the most electricity I bought all year, and the least I paid for it.
battery
Start Here: the Solar & Battery Story
A battery, seven garden panels and a half-hourly tariff — the whole story, mapped: the build, the brain, the money, the scoreboards.
So, Am I Winning?
One-word answer, then the evidence: a 43% cheaper July in an 11% dearer market, a battery filling at 6.5p, and a paper trail that proves it.
Price Capture: the One Number That Judges My Charge Planner
A dearer market, a cheaper bill. One number — achieved price minus market average — isolates the charge planner's skill from weather, solar and luck.
The Days My Solar Beat the Grid — 2026
104 days in this year my ground-level garden panels beat the grid outright. The month-by-month breakdown.
The Night My Safety Net Fought Itself
A week ago I said my battery had never breached its floor. Last night it did — not because the safety net failed to fire, but because a second safety system was running month-old code and kept turning the charger back off. Two backstops at war, and a human at 2am.
One Year of Buying Electricity Cleverly — First by Hand, Then by Script
A year ago I put in a home battery and started timing my electricity buying — by hand at first, then a Python script I built. What the year added up to.
61% of my energy bill is now standing charges
The charge planner squeezed a month of energy down to £16.93 — so the fixed daily fees are now the bill.
Five Years of Energy Bills: Cheap, Crisis, Solar
Five years of monthly electricity and gas bills laid out side by side: pre-war calm, the Ukraine spike, the partial rebound, and what installing solar + battery + Octopus Agile did to the line ever since.
Why My Battery Busbar Was Always Too Hot — and What Fixed It
I swapped my undersized £12 Amazon battery busbar for a pair of Victron 250A 6P bars after temperature sensors flagged 76°C peaks. The busbar end now runs 24°C cooler under the same load. Better data made a better decision possible — instrument the wire, not just the cells.
Solar & Battery ROI: Agile vs the Price Cap
Live ROI tracker for my solar + battery setup: actual Agile spend vs what the Ofgem price cap would have cost, updated every 2 hours.
The Days My Solar Beat the Grid — 2025
In 2025, not once did my garden panels beat the grid — the honest baseline, month by month, before the year that changed it.