AFAIK Teslas use 12V like everyone else, do you have a source for 48V? However EVs (and hybrids) do tend to have pretty small 12V batteries and I think some of

AFAIK Teslas use 12V like everyone else, do you have a source for 48V? However EVs (and hybrids) do tend to have pretty small 12V batteries and I think some of them have switched off of lead-acid: they only need the 12V to boot up the electronics, not to power a starter engine.