25/03/2026
From the energy-autonomous dinghy sailor to the energy-hungry cruising yacht – it’s a progression many of us know well.
In the beginning, I sailed a boat with virtually 0 kWh daily consumption. No electrics, no comfort – just pure sailing. With my first small cruiser came a minimal demand: a simple battery for mandatory navigation lights. Manageable and uncomplicated.
With the next, slightly larger yacht, things began to change. The desire for comfort emerged. A cool box became essential, which meant building a battery system that required regular recharging in the marina. Back then, half a day of charging for a cold drink in the evening felt like a fair compromise.
As crew size and expectations grew, so did the onboard energy system: an inboard engine, refrigeration, later an autopilot. On the family yacht, additional consumers followed – watermaker, ventilation, heating, and onboard electronics.
On longer passages or in liveaboard scenarios, energy demand quickly rises to several kilowatt-hours per day. Modern yachts can easily exceed 20 kWh daily consumption.
This leads to the key question:
Where does all this energy come from – and how should it be stored?
The obvious answer is often: “I’ll switch to lithium.”
And yes – lithium batteries are a major technological step forward: lightweight, high-performance, and capable of deep discharge.
But:
Simply replacing batteries is not a solution – it is often the beginning of new challenges.
Lithium fundamentally changes the entire onboard energy system:
• Higher charging capacities are required
• Standard alternators quickly reach their limits
• Regulators and cabling must be upgraded
• The system must safely handle sustained high currents
Lithium batteries can absorb massive charging currents – but that energy must first be generated. Without a holistic approach, system overloads and failures become a real risk.
The correct approach is therefore:
👉 Don’t just replace the battery – design a complete energy system.
This includes:
• Properly matched charging sources (solar, alternator, generator)
• High-performance charge regulation
• A well-thought-out system architecture
• And a realistic assessment of actual energy consumption
On larger yachts in particular, high-performance solutions are essential – such as powerful alternators capable of rapidly charging large battery banks.
Conclusion:💡
As onboard comfort increases, so do energy demand and system complexity.
Lithium is an important component – but only truly effective as part of a well-designed overall concept.
For those aiming at long-term autonomy, this is exactly where the focus should be.
ePower from Integrel Solutions have already been installed on hundreds of yachts and are ideally suited for bluewater sailors and liveaboards. Their ePower high-output alternators deliver 9 kW at 48 volts, offer up to 25% fuel savings compared to generator use, operate fully automatically, and at just 40 kg, are significantly lighter than a conventional genset.
Learn more here:
https://tomlogisch.com/integrel/