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Boat Battery Bank Calculator

Size your marine house battery bank for your electrical needs

Quick Samples
Try these common configurations to get started

Weekend Cruiser

Basic electronics and lights

Liveaboard Sailboat

Full systems, refrigeration, etc.

Offshore Fishing Boat

High-power electronics for a day trip

Hull Dimensions
Enter your boat's principal dimensions
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About This Tool
This calculator helps you determine the total Amp-hour (Ah) capacity required for your boat's house battery bank. It considers your daily electrical load, desired reserve time, and the type of batteries you plan to use.

Key Concepts:

Amp-Hour (Ah): The standard unit of battery capacity.
Daily Load: The total Ah consumed by all devices in 24 hours.
Depth of Discharge (DoD): How much of the battery's capacity you use.
Safety Margin: Extra capacity to account for aging and system inefficiencies.
Frequently Asked Questions

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