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Solution · RBgrid · available

See your electricity as money

RBgrid is firmware for an ESP32 hub that reads rbAmp modules and shows what every measured circuit costs — right now, today and this month — on your own tariff zones. It runs on the hub in your panel: no account, no cloud, no subscription.

The rbAmp modules measure; RBgrid collects, computes and stores.

Open the live demoGet started on rbgrid.ioWhich modules do I need?

What it shows

  • Cost right now per line and for the whole house, in your currency
  • Today and month to date — energy and cost, with yesterday for comparison
  • Which tariff zone you are in and when the cheaper one starts
  • Where the money goes — share of today's cost by line
  • Import and export measured separately, exported energy valued at your own rates
  • History from hourly to yearly, kept on the hub, downloadable as CSV

Screens from the live demo, sample data.

RBgrid Overview in the live demo: cost per hour, today and month to date, and where the money goes by circuit.

Your own tariff, computed on the hub

Time-of-use zones with weekends, per-kWh energy tax, grid fee and levies, and VAT — each entered separately and all included in the costs. Export is valued at a per-zone sell price. The tariff engine runs on the device, and its code is in the source you can read and build.

RBgrid Tariffs in the live demo: a two-zone day/night plan with VAT, its zones on the week line and the buy price per zone.

Three ways to use it

I want it to just work

Flash the hub, install the web app, run the setup wizard and see your first costs. No code to write.

I run Home Assistant

Your Home Assistant stays as it is: the hub announces every point over MQTT and Home Assistant creates the sensors itself.

I want to build it my way

Full firmware source, an ESP-IDF build, and REST, WebSocket and MQTT APIs with a published schema.

What you need

An ESP32-WROVER board

With PSRAM and 16 MB flash — one you have or any you buy. You flash it once over USB.

rbAmp modules

BASIC on the circuits you want to see, STD on the supply where import and export must be counted on the device.

Which modules and how many

Supported modules, limits and wiring for the current release are listed on rbgrid.io.

rbgrid.io/hardware →

Examples

Each one is built step by step on rbgrid.io, and opens in the live demo with sample data.

A flat

The supply, five circuits and a day/night tariff.

On rbgrid.io →

A house with a heat pump and an EV charger

What the heat pump and the charger cost in each tariff zone.

On rbgrid.io →

A house that exports

Solar, a car charger, and export valued at your sell price.

On rbgrid.io →

A workshop

Which machine runs, what the compressor costs and how close the workshop is to its input limit.

On rbgrid.io →

A car park

EV chargers measured against the input's capacity.

On rbgrid.io →

Licence

RBgrid firmware is source-available under the PolyForm Noncommercial 1.0.0 licence — free to use, modify and build for personal and non-commercial use. Commercial use requires a licence: info@rbamp.com.

The rbAmp libraries and documentation are a separate product under the MIT licence.

RBgrid measures and computes costs; it does not switch loads.

Everything else is on rbgrid.io

Guides, releases, the web-app documentation and the source code.

Go to rbgrid.ioSource on GitHub