Your batteries – our technology
Every battery can only be charged with DC voltage. However, the power grid almost always supplies AC voltage. An inverter is therefore required to communicate with the batteries in order to charge or discharge them. In many cases, a central inverter is used, which in turn communicates with a so-called power conversion system (PCS). At STABL, the transition from inverter to PCS is seamless. This is because we take a different approach with the modular multilevel inverter: the combination of Cell Monitoring Unit (CMU), STABL inverter module and Inverter Connection Box forms a system for monitoring, controlling and protecting batteries. We explain the structure and function of the individual components for smart power conversion.
The CMU continuously measures voltage, current and temperature down to cell level. These values determine whether the battery cells are in a safe or critical condition. The latter could lead to damage, loss of performance or even safety risks (e.g. fire). Possible causes include overcharging, deep discharge, overcurrent, overtemperature/undertemperature and short circuits.
The inverter module calculates and monitors the current state of charge of the battery module (State of Charge SoC), which is made up of individual cells. This is crucial for efficient use and protection of the battery.
The Inverter Connection Box is connected between the power grid and the inverter modules. The generated voltage is smoothed and the operating status of the inverter is defined. The energy management system and the power grid serve as input signals for this.
Your advantages
Our STABL inverter consists of hardware and software for logical interconnection, battery analysis and automated balancing. All these aspects are essential for the safe, efficient and long-lasting function of a battery storage system. It protects your valuable battery cells, optimizes their performance and enables intelligent control of the entire storage system. This extends the service life of your batteries and makes it easier than ever to become the owner of your energy storage system.
Compatibility decides
If you want to become the owner of your battery storage system, your batteries should have the following characteristics.
68 V DC
Max. battery module voltage
18 pc
Max. battery cells in series
NMC or LFP
Battery type
100 A
Min. current capacity
60 kg
Max. Weight
67.5 kW
Gradually scalable
Technology partner
The Swedish bus fleet operator Nobina AB has already shown the way: in future, discarded batteries from its own electric bus fleet will be installed in its own storage systems instead of being returned for early and cost-intensive recycling. Following a successful pilot project, the battery storage systems will be installed and operated to support the grid in future. In this way, Nobina is helping to stabilize the local grids as a whole and also using surplus electricity for trading on the spot market.
"The resilience of society and the stability of public transport are becoming increasingly important - especially as increasing electrification brings new challenges for system stability. Battery storage solutions using decommissioned bus batteries could play a crucial role, both for competitiveness and sustainability."
Petra Hammarin
Business Development Director at Nobina
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