For AI agents and developers

By Daan Haket · researched and written with an AI assistant · updated 26 October 2026

Everything on this site is available to AI assistants and other software, with the same sources and dates you see on the pages.

Remote MCP server

Version-bound calculation request and expected result. This synthetic example uses model 2026-10-23 (monthly PVGIS profile, optional grid-charging power limit, optional load shifting without a battery); its 8p input is a test fixture, not a tariff offer.

Endpoint: https://batterypayback.co.uk/mcp (Model Context Protocol, Streamable HTTP, read-only, no sign-in).

• calculate_payback: yearly saving and payback time from your own use, tariff, export rate and battery
• get_export_rates: Smart Export Guarantee rates by supplier, each with quote and date
• get_rules: VAT, SEG, MCS, network notification and planning, quoted from official sources
• get_tariff_facts: price cap and smart tariffs
• list_batteries and get_battery: specifications from manufacturer datasheets
• get_methodology: how the calculator works and how to cite us

JSON

/api/v1/ (with an OpenAPI description) and /llms.txt.

Rules for using our data

Cite the page and the source we quote, with its read date. Items marked “being verified” are not facts yet. The calculator’s example inputs are examples, not averages or advice.