UI apps

SunSpec Explorer

Connect to a SunSpec inverter, meter or battery and see every model it exposes fully decoded. Read once or poll, record and export, without ever writing to the device.

View on GitHub Download a release

SunSpec Explorer connected to a three-phase inverter, showing model 103 with every point decoded: label, value with units, type, scale factor, raw value and register address. — Model 103 of a three-phase inverter, every point decoded with units, scale factors, raw values and register addresses.

What it does

Every point of every model decoded: value with units, scale factor, enum and bitfield names, raw value and register address. Not-implemented points are labeled as such, never shown as 65535.
Repeating and nested groups shown as instances, and raw registers for models without a known schema.
Poll at whole-second intervals with stale values marked, and record samples as JSON Lines or CSV.
Export a JSON snapshot, the points as CSV, or a device file that sunspecctl serve turns back into the same device.
Modbus/TCP, RTU over TCP, Modbus/TCP Security (TLS) and serial RS-485. Read-only: only function codes 3 and 4 reach the wire.
A desktop application for macOS, Windows and Linux, or a daemon on a gateway with the same interface in any browser over an SSH tunnel.

See it in action

One minute with SunSpec Explorer: connect, browse decoded models, poll, record and export, against a device simulated with sunspecctl serve.

Protocols

Modbus: The most widely deployed protocol in industrial automation: meters, inverters, batteries, drives and PLCs.
SunSpec: Standard register maps for solar inverters, meters, batteries and other DER equipment, read and served over Modbus.

The README on GitHub has the full feature list, examples and changelog.

go-modbus

Modbus client and server: TCP, RTU, ASCII, TLS and UDP, typed register codecs, pooling and retries.

go get github.com/otfabric/go-modbus

go-sunspec

SunSpec over Modbus, both sides: discovers and decodes 112 built-in models into typed, scaled values, and serves simulated or real SunSpec devices.

go get github.com/otfabric/go-sunspec

modbus-simulator

Deterministic, stateful Modbus TCP and TLS device simulator driven by JSON fixtures, with fault injection, request traces and CI assertions.

modbusctl

Identify, fingerprint, scan, poll, decode and write Modbus devices. Record to MCAP and replay as a simulator.

sunspecctl

Detect, list, read and poll SunSpec inverters, meters and batteries, and serve a simulated device from a JSON file or a capture of a real one.

go-serial

Cross-platform serial ports for RS-232 and RS-485, with a Modbus RTU preset.

go get github.com/otfabric/go-serial

modbus-interop

Modbus TCP reference stacks: libmodbus, PyModbus, digitalpetri, NModbus and tokio-modbus.

SunSpec Explorer

What it does

See it in action

Protocols

Related projects