Wiring Diagram MCP

An MCP (Model Context Protocol) server that generates electrical wiring diagrams for campers, boats, and off-grid setups.

Features

Generate complete wiring schematics as SVG or PNG
Auto-generated protection components (shunt, main switch, low-voltage cutoff)
Auto-calculated fuse sizes and wire gauges
Support for solar, shore power, wind, generator, and alternator charging systems
Available as hosted remote MCP, local stdio, or self-hosted HTTP server

Usage

Hosted (easiest)

No setup needed. Use the public MCP server directly:

Claude Code:

claude mcp add wiring-diagram --transport http https://mcp.voltplan.app/mcp

Claude Desktop (claude_desktop_config.json):

{
  "mcpServers": {
    "wiring-diagram": {
      "url": "https://mcp.voltplan.app/mcp"
    }
  }
}

Local via npx

Run locally without installation:

Claude Code:

claude mcp add wiring-diagram -- npx wiring-diagram-mcp

Claude Desktop (claude_desktop_config.json):

{
  "mcpServers": {
    "wiring-diagram": {
      "command": "npx",
      "args": ["wiring-diagram-mcp"]
    }
  }
}

Self-hosted HTTP server

npm install
npm run build
npm run start:http

The MCP server starts on http://localhost:3001/mcp.

Configuration

Environment Variable	Default	Description
`VOLTPLAN_API_URL`	`https://voltplan.app`	URL of the VoltPlan instance
`PORT`	`3001`	Port for the HTTP server

MCP Tools

`generate_wiring_diagram`

Generate a complete electrical wiring diagram.

Parameters:

Parameter	Type	Required	Description
`systemName`	string	yes	Name of the electrical system
`batteries`	array	no	Battery specifications
`loads`	array	no	Electrical loads / consumers
`chargers`	array	no	Chargers with power source types
`format`	`"svg"` or `"png"`	no	Output format (default: `"png"`)

Example:

{
  "systemName": "Camper Van",
  "batteries": [
    { "name": "LiFePO4", "voltage": 12, "capacityAh": 100, "energyWh": 1280 }
  ],
  "loads": [
    { "name": "LED Lights", "power": 20, "voltage": 12, "current": 1.7 },
    { "name": "Fridge", "power": 60, "voltage": 12, "current": 5 }
  ],
  "chargers": [
    { "name": "Solar Charger", "inputVoltage": 48, "outputVoltage": 12, "power": 200, "sourceType": "solar" }
  ],
  "format": "png"
}

`list_component_types`

Returns all available component types with example configurations. Useful for understanding valid parameters before generating a diagram.

Docker

docker build -t wiring-diagram-mcp .
docker run -p 3001:3001 wiring-diagram-mcp

License

MIT

wiring-diagram-mcp

Quick Install