PowerFLARM Portable accepts specified input voltages in the range of 8V to 23V. In some aircraft with a 24V battery, an alternator can elevate the supply voltage above safe levels and trigger the internal over-voltage protection. The device then goes into an error state.
In order to operate the device at a safe voltage level, a DC/DC converter must be used. Good results have been achieved with, e.g. the Val Avionics VC 760 Voltage Converter, which reduces the supply voltage from up to 28V to a safe 14V. Please follow the manufacturer's guidelines for installation and maintenance of the voltage converter.
Other voltage convertors with similar specifications are also feasible.
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