Battery Overview

Todays battery efficiency highly depends on the chemical composition but also on the weight to energy ratio. This especially on vessels, as reduced weight means less drag which again means less energy consumed by the propulsion. Our batteries are now close to 30% lighter than the average systems commonly used in the marine industry.

During the process of becoming a leader of electric propulsion in the marine industry we realised that we couldn’t find the right batteries at the right price. Hence we are now developing and producing battery systems ourselves. We are only using the finest materials available. Proudly we realise that the big three german car manufacturers are starting to share our view.

Our ambition is to make Li-ion Battery Technology affordable and the technology of choice. Our partners and ourselves makes battery packs continuously cleaner by utilising the complete value of Lithium-Ion Cell-Technology. This by producing better designed packs and by developing smarter solutions resulting in a lower total cost of ownership for our customers. Our R&D, Engenieering and Production Departments are aligned in the efforts to create the best quality and competitive battery modules and packs with the full insight in the behaviour of the Li-ion Cell.

As we are continuously working on the optimisation of the Cycle-life it lowers the costs of service as the operational reliability increases and optimises the LCA (optimal Cycle-life and intelligent use of materials). For this matter EPT teamed up with the ‘best in class’ partners. For BMS (battery management system) and Cell design, we also have close partnerships and are involved in the design level of the components.

Most of our batteries are made of Lithium nickel manganese cobalt oxides

For us safety is as important as efficiency and power density. We have therefore done extensive testing in order to make sure that the batteries can keep up with the forces of nature.

EPT 12 V / 24 V / 48 V Battery
EPT High Voltage /
High Energy Power Packs
EPT High Voltage /
Super High Power Packs
EPT Rack System

Custom Design Battery

If you don’t find the right dimensions of the batteries, EPT can make you a custom designed battery for your specific need. Ask us for a quote, we understand that the batteries should fit the vessel and not the other way around.

Origin of the Battery Materials

Lithium92% Australia, 8% China
NickelPapua New Guinea
CobaltPapua New Guinea
ManganeseChina

Battery Comparison Chart

Mechanical & Electrical DataEPT 12V / 24V / 48V Battery
Battery High Voltage / High EnergyBattery High Voltage / High Power Pack
Nominal25.6V 109A88.8V factor of88.8V factor of
Capacity2.8kWh15.7kWh factor of10.7kWh factor of
Max continues Charge60A0.8C1.5C (2C on request)
Max Charge60A1.2C for 15min2C 
Max continues DischargeMax continues discharge 120A1.5C2.5C 
Peak DischargePeak discharge 200A <1S2C for 15min, 3C 10sec @ 25deg3C for 15 min, 5C for 10S @ 25°C
CANBus250Kb/S multiple batteries on the same BUS250Kb/S multiple batteries on same BUS250Kb/S multiple batteries on same BUS
Life Cycle2000 (@ 80% DoD, Vmax charge 28.7)2500 @ 25C° 0.5C/1C, 10% to 90% DOD> 3000 @ 25°C  0.5C/1C, 10% to 90% DOD 
Voltage2 in series is possible to get 48V, unlimited parallel9 in series, 20 in parallel9 in series, 20 in parallel
Volt Max29.2V absolut max, recommended 28.8V103V absolut max, recommended 102V101V absolut max, recommended 99V
Volt Min20V absolut min, recommended 22V68V absolut min, recommended 76V68V absolut min, recommended 76V
Temp Rangeminus 5°C to 45°Cminus 10°C to 45°Cminus 5°C to 45°C
EnclosureStainless steel, IP 54 ALU IP 65, IP 67 on requestALU, IP 54, IP 65 on request
System MountRacking systemStackableStackable
Weight20kg82kg at 15.7kWh = 5.2kg per kWh or 192W per kg78kg at 10.7kWh = 7.3kg per kWh or 136W per kg
Dimensions300 x 420 x 115 mm1090 x 425 x 147 mm320 x 330  x 630 mm
DesignFixedCustom design and size possibleCustom design and size possible
Fire ProtectionSS enclosureOptional internal  fire extinguishing systemOptional internal  fire extinguishing system
Cell Level Protection18650 small cellsSSD (overcharge protection), internal cell fuse and moreIndividual SS cell enclosures
CertificationsCE, UN38.3CE, UN 38.3, DNV-GL pendingCE, UN38.3
Warranty2 Years, 3 Years an option2 Years, 3 Years an option2 Years, 3 Years an option
Price up to 10 Pieceson request, clearly competitiveon request, clearly competitiveon request, clearly competitive
Price more than 50 Pieceson request, clearly competitiveon request, clearly competitiveon request, clearly competitive
Bigger Amountson request, clearly competitiveon request, clearly competitiveon request, clearly competitive

Additional Information & Parts