What are you trying to achieve going to 24v?
It's relatively common on large boats as they often run anchor winches or bow thrusters that have cabling runs of 30-50ft from the battery bank to device and may draw 100-150amps...that makes voltage drop a big deal and requires massive cables. Double the voltage and the amperage drops in half allowing for much smaller cables.
What DC items are you running that require high amperage? Inverters are normally placed close to the battery bank to address the voltage drop concern with short cable runs. Then the 120v AC is fine with longer distances. Most other DC items simply don't draw a lot of amps, so voltage drop isn't a big deal.
