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Electric700

Active Member
May 21, 2013
1,739
424
Florida, United States
Kauai now generates 80% or more of its energy from solar panels, and they also use batteries to compensate for the drops in solar energy output at nighttime and when clouds are over the large arrays. This is exciting and a great opportunity for Tesla, especially once the new Tesla Gigafactory becomes fully operational. It's also a great learning example as the use of solar/wind continues to expand (hopefully).

More at Battery Performance Is Hurting Hawaii's Solar Push | MIT Technology Review.
 

ItsNotAboutTheMoney

Well-Known Member
Jul 12, 2012
10,894
8,590
Maine
I'm sure that Tesla is very aware. It wants to produce 15 GWh of storage per year at the Gigafactory. That's tiny compared to US demand, which averages near 13,000 GWh per day.

For october 2014, HI's electricity generation was 869GWh,, 28GWh per day. Plenty of market to be had.
 

MartinAustin

Active Member
Jul 21, 2013
2,785
12,461
Austin, Texas USA
There's also this -

http://video.cnbc.com/gallery/?video=3000349516

Basically the approaching storm in the north east causes channels like CNBC to call up companies like Generac (stock is up 5% today) for commentary in regard to spiking sales of backup energy solutions, and the reliability of the national power grid.

Once Tesla/Solar City have a compelling product for sale, 1) I'm buying it for my house and 2) it will get boosts from this sort of bad weather too.
 

Electric700

Active Member
May 21, 2013
1,739
424
Florida, United States
I'm sure that Tesla is very aware. It wants to produce 15 GWh of storage per year at the Gigafactory. That's tiny compared to US demand, which averages near 13,000 GWh per day.

For october 2014, HI's electricity generation was 869GWh,, 28GWh per day. Plenty of market to be had.

Wow, you're right about that! 28 GWh is a lot, and Kauai with its 78 megawatt peak power rate (though I'm not sure if that's per day) is a small fraction of the total for all of Hawaii. You have to start somewhere though.
 

3mp_kwh

Active Member
Feb 13, 2013
1,123
304
Boston
Great link. I liked the part highlighting lead-acid's cycle weakness.

I wouldn't say Kauai generates "80% of its energy from solar panels". What they said was
"peak solar output on Kauai will approach 80 percent of power generation on some days". Most regard utility energy in terms of watt-hours, not instantaneous power. He was talking about that static, peak MW output. The pie chart of where Kauai's energy comes from would look very different.
 

cottylowry

2013 Model S
Jan 20, 2015
59
3
Minneapolis, MN
We were without power for several days a couple of years ago in Minneapolis. We were glad to own a Volt and not a pure BEV -- I wonder how big of a Generac system would be required to keep a Volt, 85KW Tesla running when this happens again. Has anyone investigated this?
 

AoneOne

Member
Sep 21, 2013
155
20
Fox Chapel (Pittsburgh), PA
The power needed to charge a Model S depends on how far you drive it each day. I typically drive 60 miles a day, consuming about 20 kWh. I can set the charging current as I need it, and efficiency is reasonably high once you get to around 20A @240V or about 5 kW. A typical whole-home generator, judging by the Home Depot offerings, might generate 16 - 20 kW, so I'd only need 25% of that generator's output, in the middle of the night, between 2AM and 7AM to keep me charged.

If you drive farther, you could just extend the charging time. Only once you get above 100-150 miles per day would the charging power need to be increased.
 

ItsNotAboutTheMoney

Well-Known Member
Jul 12, 2012
10,894
8,590
Maine
We were without power for several days a couple of years ago in Minneapolis. We were glad to own a Volt and not a pure BEV -- I wonder how big of a Generac system would be required to keep a Volt, 85KW Tesla running when this happens again. Has anyone investigated this?

0kW for a Volt as long as the gas stations have power. :p Depends on how much capacity you'd need, taking efficiency of charging somewhat into account. The thing is, if you avoid long trips when power's out, you might not need faster charging, in which case 3.3kW charging (Volt 1 limit) is less than larger appliance loads. . Our peak is when the stove is running, not when the Volt's being charged (I have it charging at midnight; off peak starts at 8pm, but we run laundry and dishes then.)
 

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