Yes we have step down modules that a lot of our 16V competitors use in their vehicles to run their 12v systems.
It is Part #993 and they are $109.00 plus shipping. Each one is made for 50amps max constant current. So, depending on what you are using it for you could run one or may need 2.
Will the step down work in a 24 volt system,IE 2 12 volt batteries wired in series, if so how much drop?