# VoltPlan Wiring Diagrams (remote · mcp.voltplan.app)

Generate 12V/24V/48V wiring diagrams and size wires, fuses, batteries, solar, and inverters.

- Trust score: 66/100 (medium)
- Change this week: +4
- Registry status: active
- Liveness: live
- Owner verified: no
- Last scored: 2026-08-03

## Components

- remote · `mcp.voltplan.app`: 66/100 (this document), [markdown](https://verifymcp.io/servers/yuzu-hub-wiring-diagram-mcp/mcp.md), [page](https://verifymcp.io/servers/yuzu-hub-wiring-diagram-mcp/mcp)
- npm · `wiring-diagram-mcp`: 68/100, [markdown](https://verifymcp.io/servers/yuzu-hub-wiring-diagram-mcp/wiring-diagram-mcp.md), [page](https://verifymcp.io/servers/yuzu-hub-wiring-diagram-mcp/wiring-diagram-mcp)

## Channel facts

- Endpoint: `https://mcp.voltplan.app/mcp`
- Transports: `streamable-http`
- Auth: `none`
- Version: `0.2.2`

## Trust breakdown

How this component scores in each security and reliability category. Every signal is checked automatically against the live server, and we only credit what we can confirm. Scores are 0–100 per category. Scoring method: https://verifymcp.io/docs/scoring (what has changed: https://verifymcp.io/docs/scoring/changelog)

Scored 2026-08-03.

- **Endpoint Security**: 57/100
  - The endpoint's TLS certificate is valid, in date, and uses a strong key.
  - Authorisation not fully verified: no authorisation is required to call this server, and 9 tool(s) never declared a destructiveHint. The MCP spec treats an absent hint as destructive by default, so we cannot call this surface safe.
  - HTTPS is enforced; there's no plaintext access path.
  - HSTS check failed: the Strict-Transport-Security header is absent.
  - DNSSEC check failed: this domain isn't protected by DNSSEC.
- **Transport & Reachability**: 100/100
  - Verified streamable-http transport via a live MCP handshake.
- **Schema Quality & AI Usability**: 69/100
  - AI-judged instruction clarity (excellent).
  - Context-footprint check failed: tool/resource definitions use about 1411 tokens (~156/item across 9 items; 9 tools + 0 resources), over budget; trim descriptions and params.
  - Usage-examples check failed: none of the tools include examples.
- **Stability & Change Management**: 27/100
  - Stability observed for 8 of 30 days with no destabilising changes; credit accrues until the full window elapses.
- **Tool Coverage**: 100/100
  - 100% of tools have a non-trivial description (not blank, and not just the tool's name).
  - 100% of tool parameters carry a description.
- **Capabilities**: 100/100
  - Implements a supported MCP spec version (2025-11-25); the latest is 2026-07-28.

## Install

### Claude

```bash
claude mcp add --transport http yuzu-hub-wiring-diagram-mcp https://mcp.voltplan.app/mcp
```

### Codex

```toml
[mcp_servers.yuzu-hub-wiring-diagram-mcp]
url = "https://mcp.voltplan.app/mcp"
```

### opencode

```json
{
  "$schema": "https://opencode.ai/config.json",
  "mcp": {
    "yuzu-hub-wiring-diagram-mcp": {
      "type": "remote",
      "url": "https://mcp.voltplan.app/mcp",
      "enabled": true
    }
  }
}
```

### OpenClaw

```bash
openclaw mcp add yuzu-hub-wiring-diagram-mcp --url https://mcp.voltplan.app/mcp --transport streamable-http
```

### Hermes

```yaml
mcp_servers:
  yuzu-hub-wiring-diagram-mcp:
    url: "https://mcp.voltplan.app/mcp"
```

### Other

```json
{
  "mcpServers": {
    "yuzu-hub-wiring-diagram-mcp": {
      "type": "http",
      "url": "https://mcp.voltplan.app/mcp"
    }
  }
}
```

The mcpServers block is a cross-client convention. Remote transports vary, so check your client's docs.

## Changelog

Every change recorded for this component, newest first. Days that predate change tracking, or that we cannot explain, say so: "we were watching and nothing happened" and "we were not watching" are different claims.

### 2026-08-03 (score 66, +1)

No change was recorded against any check on this day. Stability & Change Management went from 23 to 27. That category is still filling its 30-day observation window: 7 days of observed history at the previous scan, 8 at this one. The score rises as the window fills, whether or not the server changes.

### 2026-08-01 (score 65, +1)

No change was recorded against any check on this day. Stability & Change Management went from 17 to 20. That category is still filling its 30-day observation window: 5 days of observed history at the previous scan, 6 at this one. The score rises as the window fills, whether or not the server changes.

### 2026-07-31 (score 64, 0)

- [functional] We updated how we score, so this day's move reflects our rubric, not a change to the server

### 2026-07-30 (score 64, 0)

- [functional] We updated how we score, so this day's move reflects our rubric, not a change to the server

### 2026-07-29 (score 64, +1)

No change was recorded against any check on this day. Stability & Change Management went from 7 to 10. That category is still filling its 30-day observation window: 2 days of observed history at the previous scan, 3 at this one. The score rises as the window fills, whether or not the server changes.

### 2026-07-28 (score 63, +1)

No change was recorded against any check on this day. Stability & Change Management went from 3 to 7. That category is still filling its 30-day observation window: 1 days of observed history at the previous scan, 2 at this one. The score rises as the window fills, whether or not the server changes.

### 2026-07-27 (score 62, 0)

- [functional] We updated how we score, so this day's move reflects our rubric, not a change to the server

### 2026-07-26 (score 62)

First indexed and scored.

## MCP tools (9)

### `generate_wiring_diagram` (~153 tokens)

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.

Input parameters:

- `batteries` (array): Batteries in the system
- `chargers` (array): Chargers with their power sources
- `format` (string): Output format: svg (recommended, renders inline) or png (base64-encoded image, may not display in all clients)
- `loads` (array): Electrical loads / consumers
- `systemName` (string, required): Name of the electrical system (e.g. "My Camper Van")

### `list_component_types` (~38 tokens)

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` (~238 tokens)

Cable Cross-Section & Resistance Calculator

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).

Input parameters:

- `cableLengthM` (number, required): One-way cable length in meters
- `current` (number): Load current in amps. Provide either current or power.
- `isRoundTrip` (boolean): Account for both positive and negative conductor (default: true). Set to false for chassis-ground returns.
- `maxVoltageDropPercent` (number): Maximum acceptable voltage drop in percent (default: 3%)
- `power` (number): Load power in watts. Will be converted to current using the voltage. Provide either current or power.
- `temperatureCelsius` (number): Ambient temperature in °C (default: 20°C). Affects copper resistance.
- `voltage` (number, required): System voltage in volts (e.g. 12, 24, 48)

### `calculate_power_budget` (~111 tokens)

Power Budget / Energy Audit

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.

Input parameters:

- `loads` (array, required): List of electrical loads to include in the budget
- `systemVoltage` (number, required): System voltage in volts (e.g. 12, 24, 48)

### `calculate_battery_bank` (~222 tokens)

Battery Bank Sizing Calculator

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.

Input parameters:

- `dailyConsumptionWh` (number, required): Daily energy consumption in watt-hours (from calculate_power_budget)
- `daysOfAutonomy` (number): Days the system should run without any charging (default: 2)
- `depthOfDischargePercent` (number): Usable percentage of battery capacity. LiFePO4: 80-90%, AGM: 50%, Gel: 50% (default: 80)
- `singleBatteryAh` (number, required): Capacity of a single battery in amp-hours (e.g. 100, 200)
- `singleBatteryVoltage` (number, required): Voltage of a single battery (e.g. 12.8 for LiFePO4, 12 for lead-acid)
- `systemVoltage` (number, required): Target system voltage in volts (e.g. 12, 24, 48)

### `calculate_solar_size` (~164 tokens)

Solar Panel Sizing Calculator

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.

Input parameters:

- `dailyConsumptionWh` (number, required): Daily energy consumption in watt-hours (from calculate_power_budget)
- `peakSunHours` (number, required): Average daily peak sun hours for the location. Examples: Northern Europe winter 1-2h, summer 4-6h. Southern US 5-6h. Equatorial regions 5-7h.
- `systemEfficiency` (number): Overall system efficiency factor (default: 0.85). Accounts for MPPT losses, wiring losses, temperature derating, and panel soiling.

### `calculate_charging_time` (~218 tokens)

Charging Time Calculator

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.

Input parameters:

- `batteryCapacityAh` (number, required): Total battery bank capacity in amp-hours
- `batteryVoltage` (number, required): Battery bank voltage (e.g. 12, 24, 48)
- `chargeCurrentAmps` (number): Maximum charge current in amps (if limited by the charger or battery BMS). If omitted, calculated from power and voltage.
- `chargePowerWatts` (number, required): Charger output power in watts
- `currentStateOfChargePercent` (number, required): Current state of charge in percent (e.g. 20 for 20%)
- `targetStateOfChargePercent` (number): Target state of charge in percent (default: 100)

### `calculate_inverter_size` (~112 tokens)

Inverter Sizing Calculator

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.

Input parameters:

- `loads` (array, required): List of AC loads that will run through the inverter
- `systemVoltage` (number, required): DC system voltage (e.g. 12, 24, 48)

### `calculate_battery_config` (~155 tokens)

Battery Configuration Calculator

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.

Input parameters:

- `singleBatteryAh` (number, required): Capacity of one battery in amp-hours
- `singleBatteryVoltage` (number, required): Nominal voltage of one battery (e.g. 12.8 for LiFePO4, 12 for lead-acid, 3.2 for LiFePO4 cells)
- `targetCapacityAh` (number, required): Desired total capacity in amp-hours
- `targetVoltage` (number, required): Desired system voltage (e.g. 12, 24, 48)

## Diagnostics

Captured diagnostic sections: TLS, DNSSEC, Authorisation, Transports. The full working is on the page: https://verifymcp.io/servers/yuzu-hub-wiring-diagram-mcp/mcp#diagnostics

## Score history

- 2026-08-03: 66
- 2026-08-02: 65
- 2026-08-01: 65
- 2026-07-31: 64
- 2026-07-30: 64
- 2026-07-29: 64
- 2026-07-28: 63
- 2026-07-27: 62
- 2026-07-26: 62

## Links

- Remote endpoint: https://mcp.voltplan.app/mcp
- Repository: https://github.com/YUZU-Hub/wiring-diagram-mcp
- Website: https://voltplan.app/
- Changelog RSS feed: https://verifymcp.io/servers/yuzu-hub-wiring-diagram-mcp/mcp/changelog.xml
- Changelog JSON feed: https://verifymcp.io/servers/yuzu-hub-wiring-diagram-mcp/mcp/changelog.json
- HTML version of this page: https://verifymcp.io/servers/yuzu-hub-wiring-diagram-mcp/mcp