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6.3V is the standard voltage of a farm tractor battery --these vacuum tube heaters were designed to use them. 12.6V is two farm tractor batteries (one car batt

6.3V is the standard voltage of a farm tractor battery --these vacuum tube heaters were designed to use them. 12.6V is two farm tractor batteries (one car battery), which is why our computer industry uses 12V for motherboards (12 volts - 0.6V reverse protection diode). Early computer power supplies used voltage regulators that were designed for car radios, originally.

ddalex 3y ago
But is the SBR the width of two horses asses ?
- CoastalCoder 3y ago
  Horses don't "have" asses. They're both individual contributors.
  - deleted 3y ago
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  - dghlsakjg 3y ago
    That's why its pluralized
    - downvotetruth 3y ago
      The adjective form of nouns that refer to animals is usually singular when acting as adjectives (goose liver, dog food, rat race). So, it would be two horse asses. The preference for singular is likely to avoid confusion with the possessive form, which in this case would be missing an apostrophe or of for possession: two horses' asses or the asses of [those (specific / in context)] two horses.
madaxe_again 3y ago
That’s because you get ~2.1v out of a single charged lead acid cell, and an old tractor battery contains three. Your car battery has six. So the real answer to “why” is because of the electrochemistry of lead. Kinda similar to how a lot of our world is structured around the dimensions of two horses side by side.
- psychphysic 3y ago
  It'd be very hitchhiker-esque if OP got the answer because 3x(1.69 - -0.36) ~ 6.3
- foobarbecue 3y ago
  Also the electrochemistry of sulfuric acid (the other half-cell)
ChrisRR 3y ago
Are you sure about that? Many computers used ±12V in the 80s/90s when LDOs weren't common at all
- rrobukef 3y ago
  I think the cause and effect was switched. 12V was used because of 12.6V is two batteries, LDO's are used nowadays because 6V, 12V was standard.
bluGill 3y ago
Farm tractors and cars switched from 6 volt to 12 volt at about the same time, and for the same reasons. However the old 6 volt farm tractors are still around and used for framing, while 6 volt cars are rare collectors items (even though there were more of them).
- namdnay 3y ago
  I think bikes are 6V, as well as stuff like quads, jet skis etc
  - sidewndr46 3y ago
    not even close. I'm not aware of a single vehicle still in production with a 6 volt battery system. Many kick-start and pull-start engines do not have a specific voltage but may use an alternator wound with a number of different coils to produce different voltages.
    - stmpjmpr 3y ago
      Marine batteries are commonly 6v.
      - bluGill 3y ago
        Often used in series for more than 6 volts. At least in the applications i've seen, though i'm a long ways from a sea and lakes may be different.
      - sidewndr46 3y ago
        yes, because the underlying cell voltage is much lower than that. Many 6 volt batteries still exist because they are used in series to make the desired voltage. They are easier to move around and transport when they aren't build as all the cells in one unit.
      - K0balt 3y ago
        ….As part of a bank of batteries producing a higher voltage. I haven’t seen any 6v equipment manufactured for any engine based equipment larger than a couple of KW for a very, very long time (mid 1960s). Lower voltage means higher amperage means more weight, more cost, more heat, more failures. Objectively, the world would be a significantly better place if we had fully transitioned to 24v or higher (up to 48v anyway) much sooner than later. Interestingly, micro-miniaturization has reversed the trend of higher voltage = higher efficiency, at least for computing.
tiedieconderoga 3y ago
But don't 12V lead-acid batteries have a wide voltage range between charged (~14.5V) and discharged (~10V)? I don't think they would provide exactly 12.6V very often, or for very long.
- humanpotato 3y ago
  They are not 14.5V charged. They need about 14V to charge. https://footprinthero.com/wp-content/uploads/2022/05/Lead-Acid-Battery-Voltage-Charts-Image-10.jpg https://footprinthero.com/wp-content/uploads/2022/05/Lead-Ac...
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ShadowBanThis01 3y ago
Cool info, thanks!

ddalex 3y ago

But is the SBR the width of two horses asses ?

CoastalCoder 3y ago
Horses don't "have" asses. They're both individual contributors.
- deleted 3y ago
  [deleted]
- dghlsakjg 3y ago
  That's why its pluralized
  - downvotetruth 3y ago
    The adjective form of nouns that refer to animals is usually singular when acting as adjectives (goose liver, dog food, rat race). So, it would be two horse asses. The preference for singular is likely to avoid confusion with the possessive form, which in this case would be missing an apostrophe or of for possession: two horses' asses or the asses of [those (specific / in context)] two horses.

madaxe_again 3y ago

That’s because you get ~2.1v out of a single charged lead acid cell, and an old tractor battery contains three. Your car battery has six. So the real answer to “why” is because of the electrochemistry of lead. Kinda similar to how a lot of our world is structured around the dimensions of two horses side by side.

psychphysic 3y ago
It'd be very hitchhiker-esque if OP got the answer because 3x(1.69 - -0.36) ~ 6.3
foobarbecue 3y ago
Also the electrochemistry of sulfuric acid (the other half-cell)

ChrisRR 3y ago

Are you sure about that? Many computers used ±12V in the 80s/90s when LDOs weren't common at all

rrobukef 3y ago
I think the cause and effect was switched. 12V was used because of 12.6V is two batteries, LDO's are used nowadays because 6V, 12V was standard.

bluGill 3y ago

Farm tractors and cars switched from 6 volt to 12 volt at about the same time, and for the same reasons. However the old 6 volt farm tractors are still around and used for framing, while 6 volt cars are rare collectors items (even though there were more of them).

namdnay 3y ago
I think bikes are 6V, as well as stuff like quads, jet skis etc
- sidewndr46 3y ago
  not even close. I'm not aware of a single vehicle still in production with a 6 volt battery system. Many kick-start and pull-start engines do not have a specific voltage but may use an alternator wound with a number of different coils to produce different voltages.
  - stmpjmpr 3y ago
    Marine batteries are commonly 6v.
    - bluGill 3y ago
      Often used in series for more than 6 volts. At least in the applications i've seen, though i'm a long ways from a sea and lakes may be different.
    - sidewndr46 3y ago
      yes, because the underlying cell voltage is much lower than that. Many 6 volt batteries still exist because they are used in series to make the desired voltage. They are easier to move around and transport when they aren't build as all the cells in one unit.
    - K0balt 3y ago
      ….As part of a bank of batteries producing a higher voltage. I haven’t seen any 6v equipment manufactured for any engine based equipment larger than a couple of KW for a very, very long time (mid 1960s). Lower voltage means higher amperage means more weight, more cost, more heat, more failures. Objectively, the world would be a significantly better place if we had fully transitioned to 24v or higher (up to 48v anyway) much sooner than later. Interestingly, micro-miniaturization has reversed the trend of higher voltage = higher efficiency, at least for computing.

tiedieconderoga 3y ago

But don't 12V lead-acid batteries have a wide voltage range between charged (~14.5V) and discharged (~10V)? I don't think they would provide exactly 12.6V very often, or for very long.

humanpotato 3y ago
They are not 14.5V charged. They need about 14V to charge. https://footprinthero.com/wp-content/uploads/2022/05/Lead-Acid-Battery-Voltage-Charts-Image-10.jpg https://footprinthero.com/wp-content/uploads/2022/05/Lead-Ac...
- deleted 3y ago
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deleted 3y ago

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ShadowBanThis01 3y ago

Cool info, thanks!