Battery Types
Evaluating energy storage chemistries for hybrid propulsion: Flooded Lead Acid, VRLA/AGM, Lead Carbon, and Lithium Iron Phosphate (LiFePO4).
Universal System Compatibility
Hybrid Marine’s parallel hybrid system is engineered to charge any battery technology. When operating in generate mode, our system utilises a patented four-stage charging algorithm and features dedicated inputs for an external Battery Management System (BMS) to regulate both charge and discharge cycles.
Combined with Victron inverter-chargers, the entire power architecture is fully future-proofed for evolving battery technologies.
Energy Storage Technologies
Flooded (Wet) Lead Acid
Industrial traction cells offering proven performance, long operating life, and an exceptional price-to-performance ratio. They remain our standard recommendation for all non-seagoing craft where weight ballast is beneficial.
Maintenance Note: Off-gasses hydrogen/oxygen during charge requiring proper compartment venting and periodic topping up with deionised water.
VRLA / AGM & Gel
Valve Regulated Lead Acid cells retain electrolyte in an Absorbed Glass Mat (AGM) or Gel, preventing acid spills on heels or heavy seas. Ideal for offshore sailing vessels.
Considerations: Maintenance-free via internal gas recombination, but more costly than wet cells, with shorter cycle life and strict charge current limits.
Lead Carbon
A VRLA variation adding carbon to the negative plate for improved partial state-of-charge performance without maintenance requirements.
Current Status: Higher cost than flooded cells. Long-term durability in heavy hybrid propulsion duty cycles remains unproven in field conditions; not currently recommended.
Standard Lithium Ion
Covers multiple volatile consumer chemistries (NMC, LCO) optimised for high energy density in small electronics or light EVs.
Safety Warning: Higher energy density increases thermal runaway risks, making volatile lithium chemistries unsuitable for marine domestic or propulsion safety.
Lithium Iron Phosphate (LiFePO4 / LFP)
Safety is paramount in marine installations—a battery fire at sea or on a liveaboard vessel is catastrophic. LiFePO4 chemistry is exceptionally stable and safe under marine operating conditions when paired with an integrated BMS.
Key Advantages: Significant weight savings, zero maintenance, high continuous discharge rates, and immunity to damage from partial charge states.
Cost Reality: LFP systems carry a significantly higher initial investment (often double an equivalent lead acid setup). While weight reduction is critical for sailing catamarans and offshore yachts, heavily ballasted canal narrowboats gain less advantage, making lead acid the most cost-effective solution for inland waterways.
Explore hydro-regeneration and energy recovery under sail.
Regeneration →