Getting Your Boat’s Power Right
I built Marine Electrical Tools because, as someone who spends a lot of time around boat systems, I know how frustrating marine electrical work can be. Whether you are troubleshooting a flickering light or designing a complete off-grid bank, the math has to be right to keep things safe.
If you aren’t sure where to start, here’s a quick roadmap:
- Fixing a Problem: Dealing with dimming electronics or tripped breakers? Start with the Voltage Drop or Circuit Breaker calculators.
- Planning an Upgrade: Adding a fridge or an inverter? Use the Shore Power Load tool to see if your system can handle it.
- Going Solar: Cutting the dock lines? Head to the Solar Panel and Battery Bank tools to balance your daily energy harvest.
Popular Marine Electrical Tools/Calculators
Note: Calculations are estimates based on ABYC standards. View Full Disclaimer
Voltage Drop Calculator
Calculate voltage drop across DC circuits using wire size, length, and current.
Marine Wire Gauge Calculator
Determine the correct wire gauge based on current, length, and acceptable voltage drop.
Circuit Breaker Size Calculator
Determine the correct circuit breaker size based on wire gauge, load current, and ABYC safety guidelines.
Fuse Size Calculator
Calculate the correct fuse size based on wire gauge, circuit load, and ABYC safety recommendations.
Battery Bank Size Calculator
Estimate the required battery bank capacity based on daily energy usage, system voltage, and depth‑of‑discharge limits.
Inverter Size Calculator
Calculate the required inverter size based on AC appliance loads, surge requirements, and battery bank capacity.
Solar Panel Size Calculator
Estimate the required solar panel wattage based on daily energy usage, battery capacity, and available sunlight hours.
Solar Charge Controller Size Calculator
Determine the correct solar charge controller rating based on panel wattage, system voltage, and charging current.
Shore Power Load Calculator
Calculate total AC shore power demand based on appliances, inverter‑charger loads, and available dockside amperage.
Generator Size Calculator
Determine the appropriate generator size based on AC load requirements, surge demands, and charging needs.
Alternator Charge Rate Calculator
Estimate alternator charging output based on engine RPM, alternator rating, and regulator type.
Battery Charger Size Calculator
Determine the correct battery charger size based on bank capacity, chemistry, and recommended charge rates.
Our interactive Marine Voyage Power & Range Calculator:
Designed to take the guesswork out of your trip planning by providing real-time estimates for travel time and energy consumption.
Marine Anode Calculator
Prevent galvanic corrosion and protect your underwater hardware. Our calculator helps you choose the right sacrificial anodes based on your hull material and water salinity to ensure your vessel stays shielded from costly metal degradation.
Florida Keys Fishing Hotspots Tool
Stop guessing and start catching with our real-time Florida Keys Fishing Intelligence dashboard. We’ve combined live NOAA sensor data, tide trends, and proprietary bite indexes to give you a professional-grade forecast for the Middle Keys. From the 7-Mile Bridge to the offshore humps, get the data you need for a safe and productive day on the water.
Better Data for Safer Boating
The goal here isn’t just to give you a number—it’s to give you confidence. Boat systems live in a harsh environment, and “close enough” usually isn’t good enough for wiring. I’m constantly refining these tools to ensure they reflect the most reliable formulas used by pros today. If you have questions, check out our FAQs or reach out via the Contact Page if there’s a tool you’d like to see added.
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