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WaveyWaves — Sentient Page 24
Published: 2018-05-05 17:44:17 +0000 UTC; Views: 690; Favourites: 12; Downloads: 3
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[page 23]
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Another page. Not like I'm late again >,>
~150Ah@36V the battery ≈ 17 days @ ~200W
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Comments: 13
Why can't people just measure batteries in Joules (or Watt-hours)? Sure, an ideal battery provides a constant voltage (and a non-ideal battery provides voltage that behaves in a predictable way) so the conversion is well-defined for any given battery, but it's an energy-storage device, not a charge-storage device. Measure its capacity in energy.
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Measuring them in Joule would be bad. It isn't an electrical unit and needs to be converted back into Wh for any calculations anyways.
And the Wh is a unit that is already a combination of the amp hours and volts. So any change to the batteries will drastically change it while volts and amp hours alone stay relatively unchanged.
Example. Add a battery in series. Amp hours don't change in a perfect world, the voltage goes up. It's a simple addition you had to do.
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One Joule is no more or less an electrical unit than 3600 Joules; the only difference is that Watt-hours are a ridiculous unit because they're actually defined as Joule-hours per second. I'd rather use ergs (and I don't use ergs).
And for a battery, Amp-hours are not the fundamental unit; they're derived as the ratio of energy to voltage. Really, properly speaking, every battery is a 0Ah battery, because the battery does not carry any charge, and that's what Amp-hours measure (albeit in a ridiculous manner since you should use Coulombs instead of Coulomb-hours per second). It's not like it's ever easier to measure your battery requirements in terms of the current you're drawing; you can make a circuit where it's arbitrarily complex to calculate the current coming out of the battery, but in the process you have to calculate how much power each component is drawing, and those can just all be added.
Really, your example is an excellent demonstration that Amp-hours are the wrong unit to measure battery capacity. If you have two identical containers, and they do not have zero capacity, then the two of them together have more capacity than either one individually. But if you wire two identical batteries in series, the Amp-hours remain unchanged, so that can't be the capacity. If you wire them in parallel, the voltage remains unchanged, so that can't be the capacity. But either way, the energy (measured in Watt-hours if you insist on not using Joules) doubles when you have two batteries instead of one. And that's as it should be, since a battery is a device to store energy, not charge, which means it has an energy capacity, not a charge capacity.
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Still. I'll stay with watt hours and amp hours.
Why? Because both are normal, electrical units.
I learned to work with them. I use them commonly.
And it would add some extra calculations for me to work with joules. Might as well rate a battery in Newton meters.
Thing is. If you give me the joules then I still have no clue what the battery can do. I need voltage amps and a unit that tells me how much is in it. So, like the Ah and the C rating.
Might be all wrong units. And science might use different ones.
But I use those things in the real world.
(Heck, you can easily measure a battery with calories or horsepower if you feel like calculating stuff)
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so draft is a walking power plant clockwork is a fast thinking smart unit but is to small to house a proper reactor of his own joule is the mechanic and perry is just very confused at the moment also one question if clockwork and joule dont have reactors and the have to run off batteries why not make a saddle bag and wire 4 or so of those batteries in series so then dont have to carry them in their mouth and also let them have a further active range before running out of power??? oh and also set phasers to hug
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The thing is that neither Joule nor Clockwork really need more range. Clockwork is always with Draft and Joule has the batteries at home.
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true id just think it be easier if joule had a saddle bag so she wont have to carry her battery in her mouth all the time
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It's normally no big problem for her.
Now that she has somebody to talk to...maybe.
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That takes a bit of power from the wall to charge.
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81kWh
If you're going with 100% efficency
Which would mean it needs 10.5 hours to charge at 100% efficiency on the biggest normal outlet around here 3x400V/16A
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Been around bigger ones.
Basically two batteries that would have enough energy stored to more than match that stack
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