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Comment: Re:Nice idea but (Score 1) 184

I'm very suspicious of the idea of used battery packs being used for grid storage.

However, lithium is cheap and is well understood. I think Tesla could devote some of their production into non-cobalt based cells, and possibly non-nickel too, and use them for stationary storage.

Comment: Re:Do the math, that cannot charge a car... (Score 1) 441

by WalksOnDirt (#48828129) Attached to: Why We Have To Kiss Off Big Carbon Now

FYI, a kilowatt is a unit of power, i.e. a rate of energy transfer per time. 21 kilowatts means you can move around 21,000 joules of energy per second.

A 'full charge' depends on the amount of total energy the battery can store, i.e. units of simply joules. Joules are pretty small and energy for batteries is often expressed as kilowatt-hours; 1000 watts * 3600 seconds = 1 kilowatt-hour = 3,600,000 joules.

So, 86 kilowatt-hours is about 310 million joules. If you charged a 86 kilowatt-hour battery with a 21 kilowatt power supply, it would take 86 / 21 = 4 hours to charge.

I was going to point this out, but Mister AC beat me to it. You rarely run a Tesla down to empty in a day of local driving. Also, most places in the US get between 5 and 6 hours of sunlight per day, although it can be much less in winter if you're anywhere near Canada.

Comment: Re:Obviously. (Score 1) 695

What carbon would you like to tax?

All fossil carbon.

The electricity people use? Or just some portion based on percentage of generation?

Only the part that comes from fossil carbon.

Or do you include everyone with wood-burning fireplaces? Do you buy wood pellet stoves for everyone?

No. Whether they are allowed is a separate issue.

More for coal? Less for nuclear?

More tax on coal and less tax on nuclear, yes.

Who is poor? What about the middle class - sounds like AGAIN they get to pay the VAST MAJORITY, when they have already been squeezed and squeezed and have lost the value of their wages for 40 YEARS and now you want to take MORE?? Not only that, you want them to pay more for power AND more for power for the POOR that they are already helping support???

The middle class should, on average, break even. We need to discourage the use of fossil carbon while doing as little harm to the economy as possible. Cap-and-trade is worse.

Saliva causes cancer, but only if swallowed in small amounts over a long period of time. -- George Carlin