Solar Panel Calculator: System Size, Production, Battery Bank

Solar PV systems from plain text for any place: the system size for your power use or bill, kWh by month from NASA sunlight data, panels, roof area and payback; off-grid battery bank, panels, controller and inverter.

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Jumble Mog

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Calculator MCP server

agentify/calculator-mcp-server

A Model Context Protocol server for calculating. This server enables LLMs to use calculator for precise numerical calculations.

agentify

Holiday and Business-Day Calculator

c4m3r0n808/holiday-business-calculator

Calculate business days and deadline shifts across borders without a spreadsheet. Get public holidays for any of ~100 countries, count working days in a range, and roll a due date past weekends and holidays. Built for logistics, compliance, and ops teams working in markets beyond the US and UK.

Cameron Stanley

Solar Yield Estimator

ernestmarza/solar-yield-estimator

Turn coordinates into a complete solar business case. Monthly production, hourly self-consumption, payback, NPV, IRR and Monte Carlo risk. Models each roof face separately and worldwide. No API keys, free data sources only.

Ernest Marzá

Tech Debt Calculator

fiery_dream/tech-debt-calculator

Analyze GitHub repositories for technical debt. Calculate complexity, detect outdated dependencies, identify code smells, and estimate refactoring effort. Free SonarQube alternative for quick analysis.

Cody Churchwell

Electronics Calculator

mangudai/electronics-calculator

Run the everyday electronics calculations and get a clean table back. Ohm's law and the power wheel, resistor color codes both ways, LED series resistors, voltage dividers, series and parallel networks, RC and RL time constants, reactance with LC resonance, and energy cost. Offline, no API key.

Mangudäi

US Import Duty & Tariff Calculator (HTS + Origin)

tariffsapi/us-import-duty-tariff-calculator

Bulk-resolve HTS codes to the real effective US duty rate by country of origin. Stacks MFN base + Section 301, 232 and 122 into one landed rate. A hardened resolver, not a scraper.