There is more and more 24V in marine systems to deal with higher loads in recent years. Your 28' (8m) day sailor may not need much more than a starter battery,

There is more and more 24V in marine systems to deal with higher loads in recent years. Your 28' (8m) day sailor may not need much more than a starter battery, but once you're at 40' (12m) and above things start changing. E-motors in the marine world generally use 48V (AFAICT). 48V is also being looked at in the auto world as well, at least for "low voltage" stuff: * https://www.automotiveworld.com/articles/48-volt-likely-to-become-the-new-standard-for-mass-market-cars/ https://www.automotiveworld.com/articles/48-volt-likely-to-b... The IEEE's 802.3bu PoDL can handle sending 12, 24, and 48V, and automotive is one of its deployment spaces:† * https://blog.siemon.com/standards/ieee-std-802-3bu-2016-power-over-data-lines-podl https://blog.siemon.com/standards/ieee-std-802-3bu-2016-powe... * https://en.wikipedia.org/wiki/Power_over_Ethernet#Standards_development https://en.wikipedia.org/wiki/Power_over_Ethernet#Standards_... † 10BASE-T1, 100BASE-T1, 2.5GBASE-T1, 5GBASE-T1, and 10GBASE-T1; .3cz task force is working on 25/50/100 Gb/s.