DROK®150W DC Converter Voltage Regulator 10-32V/8-16V to 8-46V 12/24V Step Up Module Portable Volt Boost Transformer Board Power Converter Car Auto Automotive
First tests were successfull. Now I have to mount this unit in a small case
to be usable for SOTA or field day to provide constant 13,8V DC from the batteries
which normally have 12,5 down to some 11 volts.