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Windsun33

Windsun33
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  • In The Wake Of Tesla Announcement, SunEdison Or SolarCity? [View article]
    Incorrect - it costs the end user (consumer) in Germany about 40% less than the US, but that is because of very heavy subsidies. The actual total cost of a solar system in Germany is actually about 25% higher than in the US. And I would note that Germany has some of the highest costs for electricity of any developed country.
    May 4, 2015. 10:44 AM | 1 Like Like |Link to Comment
  • The Silliness Of Tesla's 10kWh Back-Up Battery [View article]
    Batteries do NOT produce power, they store it, so comparison to a generator is a bit like comparing ice cream to cows.
    May 3, 2015. 01:57 PM | 1 Like Like |Link to Comment
  • The Silliness Of Tesla's 10kWh Back-Up Battery [View article]
    Have you looked at the size and weight of those "new" battery packs, and figured out how they would fit into an RV?
    May 3, 2015. 01:56 PM | 5 Likes Like |Link to Comment
  • The Silliness Of Tesla's 10kWh Back-Up Battery [View article]
    It seems to me that YOU are the one that should get out more: "..All solar systems require batteries..".

    No, they do not. Very few grid-tie solar systems use any battery at all.
    May 3, 2015. 01:55 PM | 2 Likes Like |Link to Comment
  • The Silliness Of Tesla's 10kWh Back-Up Battery [View article]
    Just for grins, I did a quick calculation on what it would take in batteries for my house in Phoenix. Not a large house, around 1400 SF, central AC, no kids to screw up the power usage. I use about 600KWH average per month. Winter vs summer ratio is around 3.5 to 1.

    It would take from 5 to 16 of those batteries, depending on time of year. And the batteries last for what.. 5 years?. So at $7100 each including installation - not looking good here, is it?
    May 3, 2015. 01:42 PM | 8 Likes Like |Link to Comment
  • The Silliness Of Tesla's 10kWh Back-Up Battery [View article]
    Battery storage systems on a grid tie solar system, with the possible exception of some emergency backup to keep critical loads alive, such as refrigerator/freezer, a few lights, and any medical devices are totally NOT cost effective.

    Before I retired a couple of years ago the company I worked for sold thousands of grid tie and off grid solar electric systems. Less than 3% of the grid-tie systems also had battery, because in general it is cheaper to buy a small portable generator for backup. Grid tie solar in the summer makes sense because the peak solar power time of day matches up about 70% with peak power usage.
    May 3, 2015. 01:23 PM | 5 Likes Like |Link to Comment
  • The Silliness Of Tesla's 10kWh Back-Up Battery [View article]
    A battery requires energy to charge it. It does not care if that comes form solar, fossil, or hydro - but the fact is that you are NOT saving energy, you are STORING it. It is no different from storing water in a tank - you still need an original source for that water.
    May 3, 2015. 01:16 PM | 3 Likes Like |Link to Comment
  • The Silliness Of Tesla's 10kWh Back-Up Battery [View article]
    That depends on (1) if you are on a time of day cost plan, and (2) if you ignore the 15-20% losses involved in charging and discharging a battery and the associated inverter/charger systems, and (3) if you ignore the fact that the lifespan of that battery will be 3-7 years depending on usage, and it will cost even more to replace it when needed - assuming that such an exact replacement is even still available at that time.
    May 3, 2015. 01:08 PM | 4 Likes Like |Link to Comment
  • The Silliness Of Tesla's 10kWh Back-Up Battery [View article]
    So why don't you point out where he is wrong in his "reality"? From what I read, he is 100% correct. In fact it is even worse than what he states.
    May 3, 2015. 01:03 PM | 37 Likes Like |Link to Comment
  • In The Wake Of Tesla Announcement, SunEdison Or SolarCity? [View article]
    We are not debating the cost, efficiency, or viability of solar here - we are talking about Tesla's battery and what it brings to the board that is new - and from what I can see it brings nothing new.
    May 3, 2015. 12:56 PM | Likes Like |Link to Comment
  • In The Wake Of Tesla Announcement, SunEdison Or SolarCity? [View article]
    What progress? There is nothing new here. I was designing and selling very similar systems in the 90's. Panel prices have dropped considerably but have pretty much bottomed out, installation costs if anything have gone up or stayed about the same.
    May 3, 2015. 12:54 PM | Likes Like |Link to Comment
  • In The Wake Of Tesla Announcement, SunEdison Or SolarCity? [View article]
    Those batteries do not get charged by themselves. They need power to charge, and whether that comes from solar or fossil or hydro, it is still power usage (with an added 15-20% loss factor).
    May 3, 2015. 12:41 PM | Likes Like |Link to Comment
  • In The Wake Of Tesla Announcement, SunEdison Or SolarCity? [View article]
    Cheaper than what? It is no cheaper than many already existing similar systems.
    May 3, 2015. 12:38 PM | Likes Like |Link to Comment
  • In The Wake Of Tesla Announcement, SunEdison Or SolarCity? [View article]
    That "loads are lower at night" is a popular myth. In much of the sunbelt peak demand is from around 4PM to 10PM. People often turn their A/C off or to a higher setting in the daytime when they are not home.
    May 2, 2015. 11:25 AM | 1 Like Like |Link to Comment
  • In The Wake Of Tesla Announcement, SunEdison Or SolarCity? [View article]
    Before I retired from the solar business, some 98% of our on-grid installations were grid tie only, no battery or minimal battery (enough to keep the refrigerator and a few lights going). The off-grid market was where all the battery sales went.
    May 2, 2015. 11:07 AM | 1 Like Like |Link to Comment
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