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"List of Easy-to-Use Free MCP Servers for Proof of Concept Development" matching MCP servers:

  • Cirrus Solar MCP

    srobbins-sfdc
    F
    license
    -
    quality
    C
    maintenance
    MCP server that enables Google ADK agents to triage solar fault signals, retrieve Salesforce diagnostics via hosted MCP prompt templates, and create WorkOrder records when replacements are needed.

  • md24de-mcp

    volsch
    A
    license
    A
    quality
    A
    maintenance
    Unofficial MCP server for the messdienst24.de utility portal, providing tools to retrieve heating and hot-water consumption data, download PDF reports, and compare usage trends.
    3
    MIT

  • aria-mcp-elpriser

    kimhjort
    A
    license
    A
    quality
    C
    maintenance
    MCP server for fetching Danish electricity spot prices (DK1/DK2) using the free elprisenligenu.dk API, providing tools to get current price, cheapest hours, and price summaries.
    4
    MIT

  • solax-cloud-mcp

    mouldiwarp
    A
    license
    A
    quality
    B
    maintenance
    Provides real-time access to solar inverter data from the SolaX Cloud API, enabling queries of power output, energy yields, battery status, and grid import/export data.
    2
    MIT
  • PowerGridIQ by powergridiq

    PowerGridIQofficial

    powergridiq
    A
    license
    A
    quality
    B
    maintenance
    The PGIQ Rating as agent tools: where to site or schedule a large electricity load across 67 global power markets. Wraps a read-only REST API returning reasoned, cited ratings across access, availability, cost, momentum, and carbon, plus live grid snapshots and cheapest-window scheduling.
    6
    44
    MIT

  • mastr-mcp-server

    UliRCS
    A
    license
    A
    quality
    D
    maintenance
    MCP server for the German energy market master data register (MaStR), enabling querying of energy units, actors, grid connections, and more via 21 SOAP and public tools.
    7
    6
    MIT

  • wiring-diagram-mcp

    YUZU-Hub
    A
    license
    A
    quality
    C
    maintenance
    Enables Claude to size batteries, wire gauges, and fuses for 12V-48V electrical systems in boats, vans, and off-grid builds, and generates complete wiring diagrams as SVG or PNG.
    9
    84
    MIT

  • durable-mcp

    cshah26
    F
    license
    A
    quality
    B
    maintenance
    MCP server for Durable energy trading analytics that connects Claude Desktop to Snowflake data, enabling natural-language queries about spreads, constraints, generators, and prices.
    11

  • anker-solix-mcp

    gkoenig
    A
    license
    A
    quality
    B
    maintenance
    Enables LLM agents to query live data from Anker Solix solar systems (Solarbank, expansion batteries, Smartmeter) via natural language, such as current solar production or battery state of charge.
    12
    1
    MIT

  • PT5 MCP Server

    doudoufu
    A
    license
    A
    quality
    C
    maintenance
    Enables parsing, analysis, and export of power measurement data from Monsoon Power Monitor PT5 files, including summary statistics, sample retrieval, trend analysis, and CSV export.
    6
    15
    MIT

  • battery-analyzer-mcp

    Pankaj-Deswal
    F
    license
    A
    quality
    B
    maintenance
    MCP server for Dunn and GITT battery analysis, enabling calculation of kinetic parameters and diffusion coefficients from cyclic voltammetry and titration data.
    4

  • shelly-mcp

    Buggy1111
    A
    license
    A
    quality
    A
    maintenance
    MCP server for the entire Shelly smart-home ecosystem, enabling local-first control, automation, and energy monitoring of Shelly devices with cloud fallback.
    47
    MIT

  • elpriser-mcp

    x2q
    A
    license
    A
    quality
    C
    maintenance
    MCP server for Danish electricity prices, providing current spot price, cheapest hours, and 7-day forecast for DK1 and DK2 areas.
    5
    10
    MIT

  • fin-data-mcp-server

    CohenD
    A
    license
    A
    quality
    C
    maintenance
    A Model Context Protocol server providing free financial market data across 13 categories with 83 no-key tools, enabling access to stocks, indices, options, forex, crypto, energy, prediction markets, and more.
    83
    MIT

  • opinet-mcp

    KimJintak
    A
    license
    A
    quality
    D
    maintenance
    Provides access to Korea Petroleum Corporation's Opinet fuel price API for South Korea. Enables querying of current national and regional fuel averages, recent price trends, lowest-price stations, and nearby gas station details through natural language.
    MIT

  • Fronius MCP Server

    huber
    A
    license
    A
    quality
    C
    maintenance
    Enables access to Fronius solar inverter data via the MCP protocol, allowing real-time monitoring of energy production, consumption, and battery storage through natural language.
    14
    10
    4
    MIT