Author Topic: Solar News  (Read 7402 times)

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Offline WooferHound

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Here's Elon Musk's Plan to Power the U.S. on Solar Energy
« Reply #45 on: July 17, 2017, 05:08:55 PM »
Here's Elon Musk's Plan to Power the U.S. on Solar Energy . . .

https://www.inverse.com/article/34239-how-many-solar-panels-to-power-the-usa
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Offline lighthunter

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Re: Solar News
« Reply #46 on: July 18, 2017, 04:25:26 PM »
Right on! I dont have knowledge on slr mfg effects to environment but unless thats a deal breaker we(the ppl) are stupid not to fill rooftops with panels. Its wasted sun realestate  anyway not to mention you can double the use as roofing material. reduce size of HV transmission lines. It seems like a no brainer. Of course liquid fuels would still be needed for trains, semitrucks and airplanes but He is right!


Great read! Thanks so much for sharing this with us!!!

LH

Offline WooferHound

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India is rolling out trains with solar-powered coaches
« Reply #47 on: July 19, 2017, 03:03:08 PM »
Of course liquid fuels would still be needed for trains, semitrucks and airplanes.

India is rolling out trains with solar-powered coaches that’ll save thousands of liters of diesel
https://qz.com/1030696/india-is-rolling-out-trains-with-solar-powered-coaches-thatll-save-thousands-of-litres-of-diesel/

NASA Unveils Plans for Electric-Powered Plane
https://www.nytimes.com/2016/06/18/science/nasa-electric-plane-x57.html

Elon Musk Tweets Electric Semi Truck Will Debut in September
http://www.motortrend.com/news/elon-musk-tweets-electric-semi-truck-will-debut-september/
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Offline DJ

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Re: India is rolling out trains with solar-powered coaches
« Reply #48 on: July 20, 2017, 11:12:58 AM »
India is rolling out trains with solar-powered coaches that’ll save thousands of liters of diesel
https://qz.com/1030696/india-is-rolling-out-trains-with-solar-powered-coaches-thatll-save-thousands-of-litres-of-diesel/

Typically, the numbers quoted don't add up.  Even building in optimistic  factors, there is no way the panels are going to come near anything like the fuel savings quoted. The energy the panels produce even when given every possible benefit, Production and hours per day assumed best possible case, every day, does not come near the energy content of diesel for the savings amount claimed.

Hope the indians know what they are getting into... or not be going to be able to get out of!

Offline dang

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Re: Solar News
« Reply #49 on: July 21, 2017, 09:28:06 AM »
I think someone has not factored in the immense scale of their national rail system..

There are 12,000-plus scheduled passenger train routes scheduled daily, 5000 of its 10,000 locomotives are diesels. Appears each passenger car has its own little diesel power source for local lighting, venting and safety loads. India has 65,000~ passenger coaches...  If even 50% of them have aux power AND this saves one gallon of diesel a day then that is 12 million gallons of diesel unburned over a calendar year. Then how about the man-hours saved fueling & servicing the diesels plus the reduced fuel losses from spillage and lowered number of preventable accidents & equipment failure counting on an environmental perspective...

More factoids: seating capacity of the Indian Railways 5 million yet they will transport 23+ million people a day.

http://24coaches.com/indian-railways-facts-and-figures/
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Offline Solarnewbee

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Re: Solar News
« Reply #50 on: July 21, 2017, 07:35:17 PM »
Aren't the rooftops of Indian trains usually full sunlight blocking people?

SN

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Offline bj

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Re: Solar News
« Reply #51 on: July 23, 2017, 08:03:24 PM »
  Just back from camping, so thanks Woof, good read.
  And thanks to Dan for some good clarification. 
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bj

Offline DJ

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Re: Solar News
« Reply #52 on: July 24, 2017, 02:43:28 AM »
I think someone has not factored in the immense scale of their national rail system..

Quote
Although the train will still be pulled by a diesel-powered locomotive, a set of 16 solar panels atop each coach will replace the diesel generators that typically power these appliances. The railways estimate that a train with six solar-powered coaches could save around 21,000 litres of diesel every year, worth around Rs12 lakh.

As interpret the statement made there, they are refering to a saving of 21,000L PER TRAIN not per the whole network.
I give them more credit than to be working on a saving of only 21K L for the whole railway network.
 Maybe some places might be that greenwashed but I doubt the Indians are.
 
Going on a train of 6 Carriages  with 16 Panels of say 300W ea, 8 hours of sunlight which would be way optimistic given they all can't be facining the ideal direction let alone if any are at a particular time.   I cannot see the energy return of 21K l of Diesel.  If each individual train does not add up, you can have 10000 trains and it still won't work out.

Quote
Aren't the rooftops of Indian trains usually full sunlight blocking people?

I think you have a VERY valid point.  The vids I have seen where people tend to get on the roofs of the trains are the Diesels. I have seen vids of people getting BBQ'ed on top of electrics but they tend to appear to be less .  The other thing is if the panels are going to be smashed with people climbing on them or even stolen.  I imagine something like a solar panel could be a very desired item in the poor parts for either personal home use of sale for extra income.
I'm also lent to wonder about the possible reduction of output through the buildup of diesel soot on the panels although that maybe countered by the everyday rains in Monsoon season which isn't exactly great for solar output either.
Perhaps they would be a lot better off putting the panels on top of the railway stations where the panels could be set up for a lot better efficiency and make the saving through less power consumption or back feeding into the grid. 

Seems to me to be yet another of the endless feel good greenwashed but completely over hyped and poorly thought out ideas.