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PaulTD

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  • The Silliness Of Tesla's 10kWh Back-Up Battery [View article]
    "no, that's not what I meant (but you knew that)."

    Well, I could assume that's not what you meant. But yes, Tesla has had some successes, and also some failures. The glaring success is the Model S, the glaring failure is the continued loss of money. And the successes will stand, even if the whole venture ultimately fails financially or idealistically.
    May 4, 2015. 10:17 AM | 1 Like Like |Link to Comment
  • The Silliness Of Tesla's 10kWh Back-Up Battery [View article]
    @zelaza

    "newton.meter is a unit of work and also a unit of energy."

    If a newton-meter can be both, then why can that not also be true of a watt? Methinks you are a confused engineer.

    From wikipedia: "When an object's velocity is held constant at one meter per second against constant opposing force of one newton the rate at which work is done is 1 watt...

    In terms of electromagnetism, one watt is the rate at which work is done when one ampere (A) of current flows through an electrical potential difference of one volt (V)."

    Yes, I am also confused. If I quote my energy usage in watts, someone tells me watts are not a unit of energy. If I quote my energy usage in joules, most people don't have a clue what I'm talking about. The utility charges for watts used per hour. But in scientific terms that is actually joules per second per hour, whatever that means.

    They also tell me the current is alternating, running one direction and then reversing 60 times per second, but somehow my meter only runs continuously forward instead of staying in one place. They also tell me the voltage oscillates between -170 and +170, but my voltmeter reads a steady 115 volts or thereabouts. This is all supposedly caused by electrons zooming about at near the speed of light, which is an impossibility according to the laws of physics.

    So yes I am very confused, LOL. The end result is that someone else ends up with my money.
    May 4, 2015. 09:49 AM | 1 Like Like |Link to Comment
  • The Silliness Of Tesla's 10kWh Back-Up Battery [View article]
    "a startup that continues to succeed."

    By 'succeed' I assume you mean continually lose money at an alarming rate while enriching the principals at a high cost to the taxpayer.
    May 3, 2015. 10:40 PM | 5 Likes Like |Link to Comment
  • The Silliness Of Tesla's 10kWh Back-Up Battery [View article]
    "By the way, making a unit in such a way that it will take two men instead of one to install it is also pretty dumb, IMO. "

    Maybe by the time they add the gullwing doors, they will have a software update that lets the battery install itself?
    May 3, 2015. 10:34 PM | 3 Likes Like |Link to Comment
  • The Silliness Of Tesla's 10kWh Back-Up Battery [View article]
    "Actually only a fool would neglect to account for the rise in the value of the home due to having this thing installed.

    I have no idea what that number is. "

    LOL! Who is the fool???
    May 3, 2015. 10:31 PM | 2 Likes Like |Link to Comment
  • The Silliness Of Tesla's 10kWh Back-Up Battery [View article]
    "Yes 9KWh is the correct amount of energy used if the water heater runs for one hour,"

    Actually that's completely incorrect. The amount of energy used is 3.6 Megajoules. A kWH, it turns out, is a non-scientific term used by utilities and has no place in a discussion of joules per second or per hour. But it is easier than multiplying hundreds of millions of joules by infinitessimally small fractions of a cent per joule to arrive at one's dollar usage. So, in the parlance of utilities, a kilowatt-hour is 1000 watts consumed per hour, and in that nomenclature a watt is a unit of energy. In scientific nomenclature, a watt is a unit of work.
    May 3, 2015. 09:48 PM | 1 Like Like |Link to Comment
  • The Silliness Of Tesla's 10kWh Back-Up Battery [View article]
    "Lol. Thanks for the fake sympathy. I'm glad to own a collector's item."

    Double LOL. A lot of people own Nissan Leaf collectors items, and they can't give them away.
    May 3, 2015. 08:28 PM | 1 Like Like |Link to Comment
  • The Silliness Of Tesla's 10kWh Back-Up Battery [View article]
    "People that use "kW per hour" do not understand fundamentals such as electrical units of energy, much less engineering."

    ??? Please enlighten me. 3 KW per hour is 3 KW of energy for one hour, or 3 KW Hours. A 9000 watt electric water heater uses 9000 watts per hour (if run continuously), which is 9 KW Hours.
    May 3, 2015. 08:25 PM | Likes Like |Link to Comment
  • The Silliness Of Tesla's 10kWh Back-Up Battery [View article]
    "Funny that you think a fuel burning, co2 creating machine is cheaper and more environmentally friendly, they are neither. "

    ??? A 3500 watt generator is WAY less than $7100. As an investment, buy 20 generators with that $7100, and sell them at a markup during a hurricane. No thanks necessary.
    May 3, 2015. 08:19 PM | 3 Likes Like |Link to Comment
  • The Silliness Of Tesla's 10kWh Back-Up Battery [View article]
    @mikestesla,

    I believe the effective capacity is probably around 8 KwH, so that affects the math. And the battery will die just about the time it breaks even. The real reasons for this battery strategy are the extremely generous govment subsidies (something on the order of 90%), coupled with the need for profits, new product announcements, distractions, and places to use up a huge oversupply of batteries.
    May 3, 2015. 08:15 PM | 8 Likes Like |Link to Comment
  • The Silliness Of Tesla's 10kWh Back-Up Battery [View article]
    "If we still have a planet in the next few years."

    That's a big IF. Everyone knows the earth has an expiration date, it was 2012, although that got pushed back. So now it's only a couple of more years, so burn whatever you feel like burning.
    May 3, 2015. 08:08 PM | 3 Likes Like |Link to Comment
  • The Silliness Of Tesla's 10kWh Back-Up Battery [View article]
    "Can you be more specific? Look at it for every 8 hours, for what?"

    What fun! You should also stop your car every 50 miles and check if the engine is still in the car, then check the oil and coolant levels, and maybe run a compression check. And don't run it in your house for god's sake, it's an engine, not a blender. Maybe keep it in the pool house for emergencies, very expensive to own and operate.
    May 3, 2015. 08:06 PM | 7 Likes Like |Link to Comment
  • Rooftop Solar Will Prevail Against Utility Obstruction Efforts [View article]
    "Rooftop solar is a consumer fad, and proper analysis will evaporate 50-80% of the market "opportunity," that these companies now routinely assume. "

    I agree wholeheartedly. When the subsidies die, the demand will die...unless solar systems become incredibly cheap. At 50 cents / watt installed, there might be a market.
    Apr 9, 2015. 02:57 PM | Likes Like |Link to Comment
  • Rooftop Solar Will Prevail Against Utility Obstruction Efforts [View article]
    Solar customers use the grid 20+ hours per day and the author is pretending not to know this. Anyone is free to disconnect from the grid, good luck with that. The utilities must restructure their prices to reflect new technology, else they will be out of business, just like so many industries that have been impacted by new technology. (polaroid, US mail, newspapers, publishers, cable providers, land-line phone companies, etc). Net metering was govt mandated, and the solar industry only exists because of govt mandates and largesse.
    Apr 8, 2015. 09:55 PM | 3 Likes Like |Link to Comment
  • Two Scenarios For Tesla's 2015 Unit Sales - 55K Vs. 39K [View article]
    "But there's no way I'm going to spend $100k on one"

    You can get a nice one on ebay for just over $60K, with a bunch of expensive options. Or a used Volt with HOV lane access, and a 300 mile renewable range, well under $20K.
    Apr 7, 2015. 04:00 PM | 4 Likes Like |Link to Comment
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