EVolve Battery Systems manufactures lithium-ion battery systems for marine applications including electric propulsion, hybrid marine power, onboard energy storage, autonomous surface vessels (ASVs), and unmanned underwater vehicles (UUVs). Marine systems typically require higher capacities than airborne equivalents: practical marine propulsion systems start at 25 kWh and scale to 300+ kWh in multi-pack configurations. Voltage configurations span 48V to 460V. NMC chemistry provides higher energy density per kilogram compared to LFP, which matters on vessels where payload and weight distribution are constrained. EVolve aluminum enclosures provide structural protection in the marine environment. All systems are manufactured in Boulder, Colorado, USA.
Primary propulsion battery for electric boats, electric ferries, and electric workboats. High-capacity configurations (50–300+ kWh) with high continuous discharge for sustained propulsion loads.
Energy storage component for hybrid diesel-electric or hybrid gas-electric marine drive systems. Defined CAN interface enables integration with hybrid power management systems.
Power systems for autonomous surface vessels and uncrewed surface vehicles (USVs). Long-duration low-power discharge with burst availability for sensors and communications.
UUV battery packs designed for the pressure, temperature, and sealing requirements of submerged operation. Aluminum enclosures with custom sealing strategies; see also Defense UUV applications.
Related solutions page →Hotel load power (lighting, electronics, HVAC) for vessels using shore power or renewable generation charging. Multi-pack parallel strings scale capacity for extended autonomy.
High-current DC power for marine propulsion test facilities, dynamometer loading systems, and propulsion development labs.
Standard MonoLith enclosures are machined 6061-T6 aluminum with mechanical sealing provisions. Standard configurations do not carry an IEC IP67 rating as a catalog specification; IP rating is a program-specific design exercise that depends on enclosure geometry, connector selection, and vent/pressure relief requirements.
For marine programs requiring specific IP ratings, EVolve can design enclosures to target IP67 (dust-tight and 30-minute immersion to 1m) or IP65 (dust-tight and water jet protection) using:
Marine propulsion loads are sustained and high, unlike aerospace where short burst discharge dominates. This drives marine battery requirements toward higher total energy capacity and moderate continuous discharge rates. Typical configurations:
| Application | Voltage | Capacity | Notes |
|---|---|---|---|
| Small electric boat | 48V – 96V | 10 – 30 kWh | Day use; 2–4 hr range at moderate speed |
| ASV / USV | 48V – 200V | 25 – 80 kWh | Extended autonomy; low avg. power draw |
| Hybrid ferry / workboat | 200V – 460V | 100 – 300+ kWh | Multi-pack parallel strings; dock charging |
| UUV | 48V – 200V | 5 – 50 kWh | Sealed enclosure; depth-rated design |
Multi-pack parallel strings are the standard approach for large marine energy storage. EVolve can design multi-pack systems with shared BMS architecture or independent BMS per pack with coordinated SOC management. Contact engineering during RFQ to discuss the preferred architecture for your application.
Marine operating environments place specific demands on the BMS. The custom BMS (standard in MonoLith) provides:
Marine battery safety is governed by a patchwork of standards depending on vessel type and jurisdiction. Relevant standards and EVolve's current posture:
| Standard | Scope | EVolve Posture |
|---|---|---|
| ABYC E-13 | Lithium battery systems for recreational boats (U.S.) | Design awareness; can support compliance review for recreational marine programs |
| IEC 62619 | Safety requirements for stationary/industrial Li-ion batteries | Design aligned with IEC 62619 safety architecture; qualification per-program |
| DNV Type Approval | Classification society approval for commercial marine vessels | Qualification pathway available; discuss requirements during RFQ |
| UN38.3 | Transport safety classification (shipping) | All systems shipped with UN38.3 documentation |
Programs requiring classification society approval (DNV, ABS, Bureau Veritas) should discuss this requirement during the RFQ phase. EVolve can support the documentation and testing process required for type approval.
Submit vessel type, propulsion power requirements, hotel load, target range/endurance, voltage preference, physical envelope, and any sealing/IP requirements.
EVolve reviews for in-catalog fit or custom configuration requirements within 2–5 business days. STEP CAD and ICD provided on contract.
8–16 weeks for first-article prototype. Complete documentation package enables vessel integration from a known baseline.