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.
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
| Lithium | 92% Australia, 8% China | ||
| Nickel | Papua New Guinea | ||
| Cobalt | Papua New Guinea | ||
| Manganese | China |
Battery Comparison Chart
| Mechanical & Electrical Data | EPT 12V / 24V / 48V Battery | Battery High Voltage / High Energy | Battery High Voltage / High Power Pack |
|---|---|---|---|
| Nominal | 25.6V 109A | 88.8V factor of | 88.8V factor of |
| Capacity | 2.8kWh | 15.7kWh factor of | 10.7kWh factor of |
| Max continues Charge | 60A | 0.8C | 1.5C (2C on request) |
| Max Charge | 60A | 1.2C for 15min | 2C |
| Max continues Discharge | Max continues discharge 120A | 1.5C | 2.5C |
| Peak Discharge | Peak discharge 200A <1S | 2C for 15min, 3C 10sec @ 25deg | 3C for 15 min, 5C for 10S @ 25°C |
| CANBus | 250Kb/S multiple batteries on the same BUS | 250Kb/S multiple batteries on same BUS | 250Kb/S multiple batteries on same BUS |
| Life Cycle | 2000 (@ 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 |
| Voltage | 2 in series is possible to get 48V, unlimited parallel | 9 in series, 20 in parallel | 9 in series, 20 in parallel |
| Volt Max | 29.2V absolut max, recommended 28.8V | 103V absolut max, recommended 102V | 101V absolut max, recommended 99V |
| Volt Min | 20V absolut min, recommended 22V | 68V absolut min, recommended 76V | 68V absolut min, recommended 76V |
| Temp Range | minus 5°C to 45°C | minus 10°C to 45°C | minus 5°C to 45°C |
| Enclosure | Stainless steel, IP 54 | ALU IP 65, IP 67 on request | ALU, IP 54, IP 65 on request |
| System Mount | Racking system | Stackable | Stackable |
| Weight | 20kg | 82kg at 15.7kWh = 5.2kg per kWh or 192W per kg | 78kg at 10.7kWh = 7.3kg per kWh or 136W per kg |
| Dimensions | 300 x 420 x 115 mm | 1090 x 425 x 147 mm | 320 x 330 x 630 mm |
| Design | Fixed | Custom design and size possible | Custom design and size possible |
| Fire Protection | SS enclosure | Optional internal fire extinguishing system | Optional internal fire extinguishing system |
| Cell Level Protection | 18650 small cells | SSD (overcharge protection), internal cell fuse and more | Individual SS cell enclosures |
| Certifications | CE, UN38.3 | CE, UN 38.3, DNV-GL pending | CE, UN38.3 |
| Warranty | 2 Years, 3 Years an option | 2 Years, 3 Years an option | 2 Years, 3 Years an option |
| Price up to 10 Pieces | on request, clearly competitive | on request, clearly competitive | on request, clearly competitive |
| Price more than 50 Pieces | on request, clearly competitive | on request, clearly competitive | on request, clearly competitive |
| Bigger Amounts | on request, clearly competitive | on request, clearly competitive | on request, clearly competitive |
