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  1. VectorBear

    Most (all?) hybrids and BEVs have a 12V (or 16V) battery. Why?

    A couple of searches for average lfespan of cars in Canada says about 12 years but due to mileage of >300k km (why don't we say 300Mm?). None of the results mention corrosion, there is mention of longer times. Search "what is the average lifespan of a car in canada" or salty region of choice...
  2. VectorBear

    Most (all?) hybrids and BEVs have a 12V (or 16V) battery. Why?

    Anticorrosion in the past 20-30 years has become so good that very few vehicles in our road salt belt have visible corrosion. It really isn't a problem anymore. However, body damage will corrode quite well, most often visible corrosion on vehicles is at a visible dent or deep scratch.
  3. VectorBear

    Most (all?) hybrids and BEVs have a 12V (or 16V) battery. Why?

    Dimming lights is just poor design, regardless of voltage. Here are the currents, here are acceptable losses, do it. The mechanical equivalent might be too close to yield.
  4. VectorBear

    Most (all?) hybrids and BEVs have a 12V (or 16V) battery. Why?

    I am in the road salt zone, not a problem since the '90's when cars vastly improved. Is salt spray an issue?
  5. VectorBear

    Most (all?) hybrids and BEVs have a 12V (or 16V) battery. Why?

    Stepping back and looking at the requirements, 12V was a bad choice. It was simply based on 6-cells of lead-acid (so why not 5 for 10V?). Those were the days of chunky designs, now engineering has far more finesse. Since now most ancilliaries need step down regulators anyway or designed for a...
  6. VectorBear

    Most (all?) hybrids and BEVs have a 12V (or 16V) battery. Why?

    Any corrosion above zero is bad, beginning of the end. The rule of thumb for marine is that air spaces breath, seals just slow it down, a lot. Proper fuses are selected by their current vs time curves, but automotive fuses are often picked up at local stores. So yes, point taken about "fuseable...
  7. VectorBear

    Most (all?) hybrids and BEVs have a 12V (or 16V) battery. Why?

    I now fully agree with a seperate small battery for, if nothing else, a "UPS" for emergency braking, flashers, etc. WRT the OBD2 requiring 12V because the lawyers say so, if the main supply is 48V, a small POL converter can efficiently supply that small load, no issues. Way back when, British...
  8. VectorBear

    Most (all?) hybrids and BEVs have a 12V (or 16V) battery. Why?

    That is the definitive explanation, explains well. The reasons seem mostly safety related such as firefighters knowing the vehicle is as dead as possible, and for the worst case of HV reaching the 12V. Not to diminish the latter, there is already a HV to 12v converter and that one can fail...
  9. VectorBear

    Most (all?) hybrids and BEVs have a 12V (or 16V) battery. Why?

    In a collision, the traction contactor can and should turn off, so no HV outside of the pack. Quite safe, simple and reasonable. However the HV pack still exists intact or you have other major problems such as a mushroom cloud forming over your car. Why can't the traction pack still power those...
  10. VectorBear

    Most (all?) hybrids and BEVs have a 12V (or 16V) battery. Why?

    For standby (car powered down), why not have a low quiescent power traction voltage to 12V converter to power standby peripherals such as RFID key fob detector, security system, door locks, computer when the car initially powers up, etc. Once the car does power up, immediately the traction...

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