Vessel Energy Usage Calculator
Estimate energy use from the loads and battery assumptions you enter. Results are arithmetic estimates, not an electrical system design.
This calculator provides estimates only. It does not certify a system or select equipment.
Calculation scope and limitations
Power in kW is converted using 1 kW = 1,000 W; energy in kWh is converted using 1 kWh = 1,000 Wh. Amp-hour equivalence is daily Wh divided by the voltage you entered.
The estimate assumes the entered values represent the loads and battery for the same system. It does not include conversion losses, charging sources, varying loads, temperature effects, battery discharge characteristics, wiring, protection, installation rules or other system constraints. No default efficiencies or technical constants are added.
Use manufacturer data and have a qualified marine electrical professional review system sizing and installation. This tool is not engineering certification or a substitute for applicable standards.