Battery Hybrid / Peak-Shaving

Battery packs displace aux-engine running by absorbing load peaks and filling load troughs with steady generator output. Net saving depends on aux SFOC curve shape and round-trip battery efficiency - typically 5–12 % of aux fuel on well-sized installations.

DesignHybridBattery

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This calculator requires JavaScript to compute its result. The formula, symbols, and regulatory sources are shown in the Formula section below.

Formula, assumptions, and limits

\Delta F = \frac{(\text{SFOC}_\text{peak} - \text{SFOC}_\text{avg}) \cdot E_\text{batt}}{10^6 \cdot \eta_\text{RT}}

Symbol	Meaning	Unit
$\Delta F$	Annual fuel saved	t
$\text{SFOC}_\text{peak}$	Aux SFOC at peak load	g / kWh
$\text{SFOC}_\text{avg}$	Aux SFOC at optimum (average) load	g / kWh
$E_\text{batt}$	Annual kWh cycled through battery ( $\text{capacity} \cdot \text{cycles} \cdot 365$ )	kWh
$\eta_\text{RT}$	Battery round-trip efficiency	fraction

Source: DNV - *Battery systems for maritime applications*; Corvus Energy - ESS white papers; IMO MSC.1/Circ.1645 - safety guidelines on lithium-ion batteries

In short

Fuel and CO₂ saving from a hybrid battery pack that smooths aux-engine load profile.

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