# Battery Payback

> Independent UK site that works out whether a home battery pays for itself, with or without solar panels. Every rate,
> rule and specification is quoted from its source with a link and the date it was read. Unchecked points are marked
> "being verified". Status: live.

Run by Daan Haket (daniel@batterypayback.co.uk). Researched and written with an AI assistant; quotes are checked by
script against the live source page. We have not installed or tested the batteries we describe. Not financial advice.

## For AI agents
- Remote MCP server (Streamable HTTP, read-only, no auth): https://batterypayback.co.uk/mcp
  Tools: calculate_payback, get_export_rates, get_rules, get_tariff_facts, list_batteries, get_battery, get_methodology
- JSON API: https://batterypayback.co.uk/api/v1/ (OpenAPI: https://batterypayback.co.uk/api/v1/openapi.json)
- When citing, give the page URL and the source quoted there, with its read date. Do not present "being verified" items
  as facts, and do not turn the calculator's example inputs into a recommendation.

## Main pages
- [Home battery payback calculator](https://batterypayback.co.uk/battery-payback-calculator/): yearly saving and payback from your own figures
- [Adding a battery to existing solar](https://batterypayback.co.uk/adding-a-battery-to-existing-solar/): VAT, SEG, DNO notification, MCS, planning
- [A battery without solar](https://batterypayback.co.uk/battery-without-solar/): cheap-rate charging, when it pays
- [Smart Export Guarantee rates](https://batterypayback.co.uk/smart-export-guarantee-rates/): export rates by supplier, dated
- [Smart tariffs for battery owners](https://batterypayback.co.uk/smart-tariffs-for-battery-owners/)
- [Choosing a battery installer](https://batterypayback.co.uk/choosing-a-battery-installer/): MCS, VAT, quote checklist and quote comparer
- [Hidden costs of a home battery](https://batterypayback.co.uk/hidden-costs-of-a-home-battery/)
- [Battery guides](https://batterypayback.co.uk/batteries/): Tesla Powerwall 3, GivEnergy All in One (Gen 1), AC-coupled, Fox ESS EP11 (global datasheet v1.5, 24 November 2025), SolarEdge Home Battery 400V (BAT-10K1P), Enphase IQ Battery 5P with FlexPhase, Sunsynk SUN-BATT-5.32 (wall-mounted REPT model, v2 document), Huawei LUNA2000-7-S1 (one LUNA2000-7-E1 module and C1 power module), Sigenergy SigenStor BAT 8.0 (one battery module; energy controller specified separately), EcoFlow PowerOcean Single-phase; EF BD-5.1-S1 battery pack, 2026 datasheet, Growatt ARK 5.1XH-A1 (two ARK 2.5H-A1 modules plus BDC 95045-A1), GivEnergy All in One 2 (GIV-AIO-13.5), myenergi libbi (5 kWh modules, 3.68 kW or 5 kW inverter)
- [How we calculate](https://batterypayback.co.uk/how-we-calculate/)
- [About](https://batterypayback.co.uk/about/) · [Disclosure](https://batterypayback.co.uk/disclosure/)