offGrid Systems website
Project duration: 6 months
Projectvorm: Fixed price
Period: spring-autumn 2016
Activities: Idea, proof of concept, design electronics and firmware, prototyping, production, support & warranty
Technologies: STM32 Cortex M3, CAN-bus, C, high-current, LiFepo4 charging, DipTrace, EmBits, Meanwell


The Off-Grid energy system monitoring and management solution consists of smart batteries amongst others. A disadvantage of these smart batteries is that they don't go very well with modern-day off the shelf 'smart' battery chargers.

29V/16A Battery charger

To get round the problem of batteries outsmarting the charger, we have developed a 'simple' constant-voltage/constant-current power supply. This power supply is based on a standard MeanWell 24V/480W industrial din-rail power supply. With some additional electronics, the existing control loop is modified to have an electronic potmeter in the voltage feedback and a constant-current control loop between the feedback opto-coupler and the current sense resistor.


  • Voltage adjustable from 24.0V to 30.0V
  • Current limit adjustable from 1.0A to 16.0A
  • 480W Constant power capability
  • Remote on/off control
  • Remote programming of setpoints and readback of actual values
  • Non-volatile voltage and current settings
  • CAN-based OGS control® bus to connect with an OGS control® Master

Agentschap NL
Gerealiseerd onder het
innovatieprogramma WBSO

ARM Cortex M3

'OGS control' is a registered trademark of Reijneveld Machinebouw B.V.