Wiring Diagram Mcp By Voltplan
About
Generate wiring diagrams and electrical calculators for campers, boats, and off-grid setups.
Details
- Author
- YUZU-Hub
- Downloads
- 179
- Categories
- Other, Developer Tools
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Setting up with Highlight
This MCP is not yet compatible with Highlight’s one-click setup. However, you can still use it with Highlight by following these steps:
- Download and install Highlight from highlightai.com/download
- Navigate to the plugins tab and select "Add Custom Plugin"
-
Configure the plugin with the settings below
Plugin Name
Wiring Diagram Mcp By VoltplanCommand (node, npx, python, etc.)Please refer to the README for specific instructions on how to obtain API keys or other required environment variables.
- Enable "Start Automatically" if you want the plugin to start when Highlight launches
From the repository
{
"mcpServers": {
"wiring-diagram": {
"url": "https://mcp.voltplan.app/mcp"
}
}
}
generate_wiring_diagram
Generate an electrical wiring diagram for campers, boats, or off-grid setups. Returns a complete schematic with batteries, chargers, protection components, and loads. Protection components (shunt, main switch, low-voltage cutoff) are auto-generated when both batteries and loads are provided.
list_component_types
List all available component types and example configurations for building wiring diagrams. Use this to understand what parameters are needed before calling generate_wiring_diagram.
calculate_wire_gauge
Calculate the recommended wire gauge / cable cross-section for a DC circuit. Considers both ampacity (current carrying capacity) and voltage drop to recommend the optimal cable size. Also returns total resistance, power loss, and a fuse recommendation. Supports copper conductors from 0.75 mm² (18 AWG) to 240 mm² (300 MCM).
calculate_power_budget
Calculate total daily energy consumption from a list of electrical loads. Each load specifies its power draw, how many hours per day it runs, and quantity. Returns total daily energy (Wh and Ah), peak power draw, and average power. This is typically the first step in sizing a battery bank and solar system.
calculate_battery_bank
Calculate the recommended battery bank size based on daily energy consumption. Accounts for days of autonomy (how many days without charging) and depth of discharge. Returns required capacity, number of batteries, and wiring configuration.
calculate_solar_size
Calculate the required solar panel wattage to cover daily energy consumption. Accounts for peak sun hours at the location and system efficiency losses (MPPT conversion, wiring, temperature derating). Returns required wattage and common panel configurations.
calculate_charging_time
Estimate how long it takes to charge a battery bank from a given state of charge to a target level. Accounts for the bulk charging phase (constant current, up to ~80% SoC) and the slower absorption phase (tapering current, 80-100% SoC). Works for any charging source: solar, shore power, alternator.
calculate_inverter_size
Calculate the recommended inverter size for running AC loads from a DC battery system. Accounts for continuous power, startup surge power (motors typically surge 2-3x), and includes a 25% headroom for the continuous rating. Returns the recommended inverter wattage and the DC current draw at system voltage.
calculate_battery_config
Determine how to arrange batteries in series and/or parallel to achieve a target voltage and capacity. Returns the number of batteries needed, the wiring configuration (e.g. 2S3P), and step-by-step wiring instructions.
Claude Desktop / Cursor
Paste into your MCP client config file to install this server.
{
"mcpServers": {
"wiring diagram mcp by voltplan": {
"wiring-diagram": {
"url": "https://mcp.voltplan.app/mcp"
}
}
}
}McpServers
{
"wiring-diagram": {
"url": "https://mcp.voltplan.app/mcp"
}
}I refit my boat with Claude as the electrician. Here's the MCP that made it possible.
{ "mcpServers": { "wiring-diagram": { "url": "https://mcp.voltplan.app/mcp" } } }
Drop that into yourclaude_desktop_config.json, restart Claude, ask:"Plan a 400 Ah lithium house bank for a 30 ft sailboat with 2 days of autonomy."Done.
Built while refittingLargo, a 1996 Maxum, in Roermond. The math kept getting in the way of the work — sizing the bank, then the gauge, then the fuse, then redoing all of it after one load changed. So I gave Claude the math. Now it sizes the bank, picks the gauge, and generates the diagram. I'd rather just do the cabling.
The calculations are the same ones any cruiser or vanlifer ends up doing on graph paper at 11pm. This server makes them a one-sentence prompt.
Nine tools, all callable by name from any MCP client:
"Plan a 400 Ah lithium house bank for a 30 ft sailboat. Loads: 12V fridge 24/7 (60W), LED nav and cabin lights (25W, 4h/day), USB chargers (30W, 2h/day), occasional inverter for a laptop (90W, 3h/day). 2 days of autonomy without solar, LiFePO4 with 80% DoD."
Claude callscalculate_power_budgetthencalculate_battery_bank:
Total daily energy: 1,870 Wh/day (155.8 Ah/day at 12V) Peak load: 205 W (17.1 A) Required capacity (2 days × 80% DoD): 4,675 Wh / 389.6 Ah Recommended bank: 4 × 100 Ah / 12.8 V LiFePO4 in parallel (4P) Total / usable: 400 Ah / 5,120 Wh → 4,096 Wh usable ≈ 2.2 days of autonomy
"What gauge wire for a 50A inverter run, 3 meters one-way, 12V, marine environment, max 3% drop?"
Recommended cable: 16 mm² (6 AWG) — rated 65 A Voltage drop: 0.34 V (2.80%) ✓ within target Total resistance: 6.7 mΩ Power lost as heat: 16.8 W Fuse: 70 A ANL bolt-down, within 18 cm of battery+ Status: OK — wire size meets all requirements.
(Ampacity alone would allow 10 mm² / 8 AWG, but voltage drop drives the choice up at this length.)
"Generate a wiring diagram for: 2 × 100W solar → MPPT → 200 Ah LiFePO4 → BMV-712 monitor → main 12V bus → fridge, lights, USB."
Claude callsgenerate_wiring_diagramand returns an SVG: batteries with terminals, MPPT charger, auto-generated shunt, main switch, low-voltage cutoff, and fused load lines in red/black with computed gauges.
Editclaude_desktop_config.json(Settings → Developer → Edit Config):
{ "mcpServers": { "wiring-diagram": { "url": "https://mcp.voltplan.app/mcp" } } }
Restart Claude. The hammer icon in the chat input means tools are active.
{ "mcpServers": { "wiring-diagram": { "command": "npx", "args": ["wiring-diagram-mcp"] } } }
# hosted claude mcp add wiring-diagram --transport http https://mcp.voltplan.app/mcp # local claude mcp add wiring-diagram -- npx wiring-diagram-mcp
Edit~/.cursor/mcp.json(or.cursor/mcp.jsonper-project):
{ "mcpServers": { "wiring-diagram": { "url": "https://mcp.voltplan.app/mcp" } } }
Open the Cline panel → MCP Servers → Edit MCP Settings, then:
{ "mcpServers": { "wiring-diagram": { "url": "https://mcp.voltplan.app/mcp" } } }
npm install npm run build npm run start:http # listens on http://localhost:3001/mcp
docker build -t wiring-diagram-mcp . docker run -p 3001:3001 wiring-diagram-mcp
Calculations run locally inside the MCP server (deterministic, no network). Diagram rendering hits the VoltPlan API and returns an SVG or PNG that the AI client embeds in the chat.
- Sailboat refit (30 ft, cruising)
- Sprinter van conversion
- Off-grid cabin
- Day sailer (minimal)
- Live-aboard (heavy loads, AC galley)
- AC-side calculations: shore power inlet, breaker panel sizing, isolation transformer
- More battery chemistries: AGM/Gel sizing curves, lead-carbon
- Multi-bank topologies: starter + house with combiner / DC-DC charger
- Wire run optimization: shared trunks, terminal block placement
- VoltPlan— web app for visual electrical system design
- VoltPlan Wire Gauge Calculator— free, no signup
Built by Stefan Lange-Hegermann (yuzuhub.com). Powered byVoltPlan.
Issues, ideas, and pull requests welcome onGitHub.
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