# estimate-soc

`station__power-systems__estimate-soc` · external (needs EXECUTION_BACKEND_URL configured) · domain `power-systems` · pv-relevance `non-pv`

State-of-Charge estimator using fused EKF + OCV + coulomb counting. Routes by available sensor data quality. Handles thermal override (>60°C), cold deration (<0°C), heavy load, and regeneration modes.

> **Note:** This tool routes through an external execution backend. If `EXECUTION_BACKEND_URL` is unset on the server, calls return JSON-RPC error `-32603 "Tool execution backend not configured"`. Tools with `backend: native` execute in-process and are always callable.

## Agent metadata

- `idempotent`: unknown
- `read_only`: unknown
- `expected_latency_ms`: unknown (not yet contract-tested)
- `cost_tokens_estimate`: unknown

## Input schema

- `voltage_v` *number* (required) — Terminal voltage in volts
- `current_a` *number* — Instantaneous current in amps (positive = discharge)
- `temperature_c` *number* — Cell temperature in Celsius
- `previous_soc` *number* — Previous SoC estimate (0.0-1.0)
- `load_state` *string* — Current load: resting, light_load, moderate_load, heavy_load, regenerating

## Example call

```json
POST /api/mcp
Content-Type: application/json

{
  "jsonrpc": "2.0",
  "id": 1,
  "method": "tools/call",
  "params": {
    "name": "station__power-systems__estimate-soc",
    "arguments": {
      "voltage_v": 0
    }
  }
}
```

## Related

- [/tools](/tools) — all 3062 tools
- [/tools/power-systems__estimate-soc](/tools/power-systems__estimate-soc) — HTML page
- [/tools/power-systems__estimate-soc/json](/tools/power-systems__estimate-soc/json) — JSON form (agent-friendly)
- [/api/mcp](/api/mcp) — endpoint
- [/AGENTS.md](/AGENTS.md) — agent guide