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Checkout the latest auto line daily w sandy munroe , Tesla is going to 48v wiring instead of multiple 12v channels https://insideevs.com/news/656775/tesla-switc

Checkout the latest auto line daily w sandy munroe , Tesla is going to 48v wiring instead of multiple 12v channels https://insideevs.com/news/656775/tesla-switch-48v-voltage-system/amp/ https://insideevs.com/news/656775/tesla-switch-48v-voltage-s... Will cost less and be more weight efficient

mynameisvlad 4y ago
Do you actually think the removal of a few bundles of wires will make any sort of difference in either price or weight when the battery pack weighs around 1000lbs and costs $10-20k to replace?
GeorgeTirebiter 4y ago
Actually.... when I worked there seven years ago, I wrote a point-by-point memo explaining why 48V was such a win (trying to move to 48V for falcon wing doors), even having the TI guys build for us some custom PCBs w/+12 to +48V converters that we could try for the powerful motors required. However....the decision was made to stick with +12V because, mainly, the Industry pumped out accessories (door locks, fans, you name it) that run on +12, and hence +48 would be 'custom' (read: 'expensive'). Was also true of the actuators. The moby FETs needed to switch the current existed and heatsinking wasn't too much of a problem, and so.... +12V it was. Big-ass thick wires... ok.... It seems some others inside found my memo recently -- or re-discovered what I had found -- and, finally, +48V seems to be moving into vehicles. With a +48V LiFePo battery, it should work really well. And to the original comment here: yes, your copper wiring is smaller because E x I is same but I*2*R is less because I is less for given power. Note the squared term; that is why +48V is a win. Somehow, it seems like some folks (I am by no means the first!) 'see the future' but for reasons I don't fully understand, The Future seems to take longer to get here than necessary.
- com2kid 4y ago
  > Somehow, it seems like some folks (I am by no means the first!) 'see the future' but for reasons I don't fully understand, The Future seems to take longer to get here than necessary. Microsoft tried to sell the world on Smart TVs back when most Americans had dial up. Smart car infotainment back in I think it was 2008 or 2009, complete with voice control. Sometimes being early can be worse than being late. (Look at all the early attempts at ebooks!)

mynameisvlad 4y ago

Do you actually think the removal of a few bundles of wires will make any sort of difference in either price or weight when the battery pack weighs around 1000lbs and costs $10-20k to replace?

GeorgeTirebiter 4y ago

Actually.... when I worked there seven years ago, I wrote a point-by-point memo explaining why 48V was such a win (trying to move to 48V for falcon wing doors), even having the TI guys build for us some custom PCBs w/+12 to +48V converters that we could try for the powerful motors required. However....the decision was made to stick with +12V because, mainly, the Industry pumped out accessories (door locks, fans, you name it) that run on +12, and hence +48 would be 'custom' (read: 'expensive'). Was also true of the actuators. The moby FETs needed to switch the current existed and heatsinking wasn't too much of a problem, and so.... +12V it was. Big-ass thick wires... ok.... It seems some others inside found my memo recently -- or re-discovered what I had found -- and, finally, +48V seems to be moving into vehicles. With a +48V LiFePo battery, it should work really well. And to the original comment here: yes, your copper wiring is smaller because E x I is same but I*2*R is less because I is less for given power. Note the squared term; that is why +48V is a win. Somehow, it seems like some folks (I am by no means the first!) 'see the future' but for reasons I don't fully understand, The Future seems to take longer to get here than necessary.

com2kid 4y ago
> Somehow, it seems like some folks (I am by no means the first!) 'see the future' but for reasons I don't fully understand, The Future seems to take longer to get here than necessary. Microsoft tried to sell the world on Smart TVs back when most Americans had dial up. Smart car infotainment back in I think it was 2008 or 2009, complete with voice control. Sometimes being early can be worse than being late. (Look at all the early attempts at ebooks!)