MCP SERVER · OFFICIAL PROJECTSize a 12V battery bank, pick the cable gauge and fuse, and get a wiring schematic back — for a boat, a camper or an off-grid cabin.
LABSCO SUMMARY
The chain is what matters: loads give you daily consumption, consumption gives you the bank, the bank and the run length give you the gauge, and the gauge comes with the fuse — so changing one load re-derives the rest instead of invalidating a page of hand maths. The wire gauge tool checks both ampacity and voltage drop, which is the calculation people usually get wrong on long runs, and the diagram fills in the shunt, main switch and cutoff rather than waiting to be asked.
Domain arithmetic for low-voltage DC electrical systems, plus a schematic generator. Eight calculators run locally and deterministically; the ninth renders the diagram.
Nothing to authorize. The simplest route is the hosted endpoint https://mcp.voltplan.app/mcp over streamable HTTP — a URL in your client config and nothing installed. Locally, npx wiring-diagram-mcp runs it over stdio from the npm package wiring-diagram-mcp, currently 0.2.2, and a Docker image serves HTTP on port 3001. VOLTPLAN_API_URL points at a different API instance. The calculations run inside the server with no network call; the diagram rendering is the part that reaches the VoltPlan API and returns the SVG or PNG your client embeds.
One command — claude mcp add wiring-diagram --transport http https://mcp.voltplan.app/mcp
USE CASES
Total the daily draw from the load list, then size the bank for the autonomy and depth of discharge you want.
Give the current, run length and acceptable voltage drop; the gauge comes back with the fuse and the heat lost in the cable.
Convert the daily consumption into panel wattage for your peak sun hours and system losses.
Ask for the series and parallel configuration that hits your target voltage and capacity, with the wiring steps.
Pass the loads and system voltage — surge headroom and the DC draw come back with the rating.
Estimate the time from the current state of charge to the target, bulk and absorption phases accounted for.
Check the component reference, then generate the diagram with the protection components filled in.
Counted once with only startup setup. Other versions, modes or optional credentials may expose a different list.
calculate_battery_bankCalculate 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_battery_configDetermine 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.
calculate_charging_timeEstimate 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_sizeCalculate 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_power_budgetCalculate 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_solar_sizeCalculate 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_wire_gaugeCalculate 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).
generate_wiring_diagramGenerate 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_typesList all available component types and example configurations for building wiring diagrams. Use this to understand what parameters are needed before calling generate_wiring_diagram.
BEFORE YOU INSTALL
9 tools when we connected.
A client that can reach a remote MCP server over HTTP
CONTEXT COST
Rated by the size of the 9 tool definitions that ride along on every turn, not by how many there are
INSTALLATION
claude mcp add wiring-diagram --transport http https://mcp.voltplan.app/mcphttps://mcp.voltplan.app/mcpAdd this hosted endpoint to your MCP client.
{
"mcpServers": {
"wiring-diagram": {
"url": "https://mcp.voltplan.app/mcp"
}
}
}{
"mcpServers": {
"wiring-diagram": {
"type": "streamableHttp",
"url": "https://mcp.voltplan.app/mcp"
}
}
}{
"mcpServers": {
"wiring-diagram": {
"command": "npx",
"args": [
"wiring-diagram-mcp"
]
}
}
}claude mcp add wiring-diagram -- npx wiring-diagram-mcpClone the repository, then build and start the HTTP server:
git clone https://github.com/YUZU-Hub/wiring-diagram-mcp.git
cd wiring-diagram-mcp
npm install
npm run build
npm run start:httpIt listens on port 3001 (set PORT to change it). Point your client at the local address instead of the hosted one:
http://localhost:3001/mcpClone the repository and build the image:
git clone https://github.com/YUZU-Hub/wiring-diagram-mcp.git
cd wiring-diagram-mcp
docker build -t wiring-diagram-mcp .Run it. The container serves HTTP on port 3001:
docker run -p 3001:3001 wiring-diagram-mcpPoint your client at the local address instead of the hosted one:
http://localhost:3001/mcpMCP servers
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