Solid State Batteries

A revolutionary development for the marine industry.

A significant step forward

Solid State Battery
Solid State Batter sketch

  • Cycle Life of more than 10´000 easily achievable
  • A greener, more economical battery with a lifespan 3-4 times longer than standard batteries, at no extra cost
  • Outstanding safety record
  • Can function without cooling in a broader temperature range, from 0 to 35°C

These batteries have the potential to transform the way energy is stored and utilized in maritime transportation, contributing to a greener and more sustainable future. 
safety points
  • When we start from scratch, we do extensive failure analyses before and during design stage
  • Our BMS is robust and proven, used in many industry and marine applications
  • We measure each single cell voltage and get alarms if one of the cells should get bad instant, even on a trend
  • 4/7 balancing as soon as the cells hit a certain target, this to avoid self-discharge and unneeded heat production
  • Each cell has its own cell fuse
  • Gas exhaust system
  • Pre-charge circuit for start-up
  • Black-out start, systems can start up when the ship is totally depowered, must have emergency supply battery 24V


Like all batteries, also EPTechnologies batteries age, by usage and by calendar aging. Calendar aging is around 1% per year if kept below 30 deg storage temp and if stored at 50 to 60% SOC.

With repeated charging and discharging (cyclical ageing). The 6 year 75% SOC capacity guarantee for the batteries is only valid if below restrictions are followed. 

DoD: Depth of Discharge

SOC: State of Charge


  • Each string can consist of 1 to 22 batteries in series for nominal, up to 844V if needed.
  • Each string has a string controller and a dasy chained com. cable, 20 kg each.
  • The string controllers have manual and remote disconnect switches and pre-charge


  • Pack control Unit PCU has double communication lines, one com. line is in stby, 10kg each. 
  • Optional slave PCU control unit that can take over if the master fails is an option.
  • Up to 24 Strings in parallel per pack controller.