How to Solar Charge an Electric Bicycle

General Discussion about electric bicycles.
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LockH   100 GW

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Re: How to Solar Charge an Electric Bicycle

Post by LockH » May 12 2016 4:02am

"Germany generated so much renewable energy last weekend electric prices went negative"
http://inhabitat.com/germany-generated- ... -negative/
The country has made headlines for its renewable energy use before, and this past weekend, it generated around 87 percent of its power from renewable sources. Electric suppliers effectively paid users to consume energy.
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Re: How to Solar Charge an Electric Bicycle

Post by MrDude_1 » May 12 2016 8:00am

LockH wrote:"Germany generated so much renewable energy last weekend electric prices went negative"
http://inhabitat.com/germany-generated- ... -negative/
The country has made headlines for its renewable energy use before, and this past weekend, it generated around 87 percent of its power from renewable sources. Electric suppliers effectively paid users to consume energy.

the problem of course is exactly what they're "promoting" there... its unsustainable without some kind of balancing. Ideally a giant battery that can absorb the peaks and supply the troughs in the supply...

The idea that its "free" or negative is an insult to all the linemen, station operators and everyone else that works on the grid. Thinking only of the supply source is just stupid and lacks perspective. They were in a lose-lose situation of too much variable power and not enough demand.. so either shut down some wind generators and solar stations, something they cannot do easily... or increase the demand... something that also costs them money.


What the world really needs right now are modern molten salt fission reactors. They can take the waste we've created over the last 60+years... the waste that will be radioactive for 1000s of years... and run it down to something that will only remain radioactive for less than 100 years. Its like recycling radioactive waste. furthermore a modern (as apposed to the 1960s tech we use today) molten salt reactors can be much safer AND they can be throttled to match the unstable power that environmental based power sources creates.
Of course if you say the word nuclear near anyone they're always afraid of it... and then where can you do it? theres the whole "not in my backyard" situation...
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Re: How to Solar Charge an Electric Bicycle

Post by LockH » May 13 2016 5:59am

Solar shutters anybuddy? From Germany:
Image

Deutsch sprechen?
http://www.swr.de/swr2/wissen/solare-fe ... index.html
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Re: How to Solar Charge an Electric Bicycle

Post by LockH » May 13 2016 7:08am

"Santa Monica to require rooftop solar panels on all new buildings"
http://inhabitat.com/santa-monica-to-re ... buildings/
Exactly one week after San Francisco became the largest U.S. city to require rooftop solar installations on new buildings, Santa Monica followed with similar legislation. On April 26, the Santa Monica City Council approved an ordinance requiring rooftop solar systems for all new construction — both residential and commercial.
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Re: How to Solar Charge an Electric Bicycle

Post by LockH » May 14 2016 8:10am

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Re: How to Solar Charge an Electric Bicycle

Post by MrDude_1 » May 16 2016 7:54am

LockH wrote:Solar shutters anybuddy? From Germany:
Image

Deutsch sprechen?
http://www.swr.de/swr2/wissen/solare-fe ... index.html
I dont like this idea, but only because I only like shutters that actually close and protect the windows. The "style" thing never appealed to me.
On the plus side, atleast they're useful for something... but I would prefer real shutters and the panels elsewhere.
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Re: How to Solar Charge an Electric Bicycle

Post by LockH » May 17 2016 12:04pm

"The World’s Largest Solar Power Plant Is Now Active In The Sahara"
http://www.huffingtonpost.com/entry/mor ... 60bf782322

(En français:)
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Re: How to Solar Charge an Electric Bicycle

Post by LockH » May 20 2016 4:21am

"New solar tech sets record for converting unfocused sunlight to electricity"
http://www.treehugger.com/solar-technol ... icity.html
Often when a new solar cell efficiency record is made, it's with the use of focused or amplified sunlight, but the UNSW team has broken the record for normal, direct, unfocused sunlight by hitting a 34.5 percent conversion efficiency. Current solar panels on the market have an efficiency of, at best, around 20 percent.
Image
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Re: How to Solar Charge an Electric Bicycle

Post by LockH » May 23 2016 9:29pm

"Quantum dot solar windows could turn any window into a power source"
http://inhabitat.com/quantum-dot-solar- ... er-source/
Image
tiny nanoparticles known as quantum dots, which can absorb sunlight as it filters through a window. The light is then emitted from the dots at the infrared wavelength and is guided to the edge of the window, where solar cells transform it into usable energy.
At first was thinking to paint just the windscreen on the trike. Now I'm thinking the whole body/shell (think "velomobile")
Image
UV light shines through a sample of transparent material containing quantum dots, tiny nanoparticles that can be used to harness solar energy for electricity. | Photo courtesy of LANL.
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Re: How to Solar Charge an Electric Bicycle

Post by LockH » May 25 2016 4:55am

http://inhabitat.com/googles-project-su ... -rooftops/
Last year tech giant Google introduced Project Sunroof, a service that allows homeowners to determine whether their home is fit for a solar array. Users can also use the service to connect with local solar providers. Google initially launched in just three cities, but as of last month the service is available in 42 states, potentially reaching as many as 43 million roofs.
Image

(Currently Project Sunroof cannot be used in Hawaii, Alaska, Idaho, Texas, South Dakota, Mississippi, Tennessee, Rhode Island, or the District of Colombia.)
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Re: How to Solar Charge an Electric Bicycle

Post by LockH » May 25 2016 2:18pm

"MIT’s new solar cell turns heat into light to break energy conversion limits"
http://inhabitat.com/mit-created-a-sola ... on-limits/
The theoretical limit of solar energy conversion, called the Shockley-Queisser Limit, was set in 1961. Ever since, engineers have been pushing the boundaries and reaching for higher conversion rates. Single-layer silicon solar cells, the most common variety, have an upper limit around 32 percent efficiency. Using multiple layers of solar cells, or multipliers like mirrors, has been the only effective way to exceed that upper limit for some time. Last week, we reported a development by a team of Australian researchers, who set a new world record for solar efficiency with a prismatic solar cell that converts 34 percent of direct sunlight into electricity without multipliers. MIT’s new solar cell could boost that figure even higher.

The MIT team—doctoral student David Bierman, professors Evelyn Wang and Marin Soljačić, and four others—took the other path toward higher efficiency, by working to convert sunlight first into heat, and then into electricity, using devices known as solar thermophotovoltaics (STPVs). Acknowledging the previously held ideas about limitations of solar efficiency, Bierman said, “with solar thermal photovoltaics you have the possibility to exceed that.” And they did.

MIT’s ‘hot new solar cell’ successfully demonstrated how STPVs are an improvement over traditional low-efficiency PV cells, although their invention isn’t grabbing any world records. “We have demonstrated, for the first time, an STPV device that has a higher solar-to-electrical conversion efficiency compared to that of the underlying PV cell,” said Wang. The team’s demonstration had an overall efficiency of only 6.8 percent, but that was a clear improvement in comparison to the original PV cell operating on its own. The study was published in the journal Nature Energy.
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Re: How to Solar Charge an Electric Bicycle

Post by LockH » May 25 2016 10:47pm

"Clean-energy work force totals eight million globally, agency says"
http://www.theglobeandmail.com//report- ... le30134433
More than eight million people now toil in the renewable-energy industry around the world, with the solar sector employing the largest number of workers.
IRENA’s report says companies in the solar-voltaic industry employed the largest group of people in the renewable sector, with about 2.8 million jobs worldwide. That’s was up 11 per cent in 2015.
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Re: How to Solar Charge an Electric Bicycle

Post by LockH » May 25 2016 11:43pm

http://www.renovagen.com/
Renovagen Ltd was founded at the end of 2012 in order to commercialise the transportable, rollable solar array generator invention. The company seeks to offer innovative renewable energy solutions and products which are disruptive technologically and commercially – in particular, applying innovative engineering to new and emerging technologies in order to offer novel solutions which maximise the value of those technologies.

In particular Renovagen is focussed on off-grid and self-sufficient applications and the trend towards “off-grid parity” of renewable energy systems. We aim to operate across a wide range of industries which face off-grid energy challenges.
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Re: How to Solar Charge an Electric Bicycle

Post by VoKuS » May 26 2016 12:58am

Just an idea for e-bikers out their, that have cargo trailers in tow.

You carry a few of these thinsheet frame less semi flexible solar panels and an 80AMP programmable up to 72V solar charge controller that supports Li-XXX batteries.

It would work for some one that takes camping trips and has long rest times in between.


Controller
http://www.morningstarcorp.com/products/tristar-mppt/
http://www.morningstarcorp.com/mornings ... batteries/
http://www.morningstarcorp.com/wp-conte ... TdsEng.pdf
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Re: How to Solar Charge an Electric Bicycle

Post by craneplaneguy » May 26 2016 8:04pm

Outback and a few other MPPT charge controllers have user set points, besides the default settings. Easily entered via digital keypads. So yeah, they would work, BUT they are heavy and 6 to 800 bucks. Using one built for an 80 amp charge rate for 2 or 3 amps would be pretty inefficient besides the cost and weight. Midnite solar has a very small mppt controller, not sure it could be set up for a 52 v battery, its 20 amp I believe, still way bigger then needed. I'm leaning more towards 3 50 watt modules, in series, and user (me) controlled. No controller at all, simple may be better here.

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Re: How to Solar Charge an Electric Bicycle

Post by midnightcheese » Jun 02 2016 6:44pm

I'm pretty new to all this, but would something like this work?

- I have a Trek 520 designed for touring, steel frame with BBSHD and 48v 14Ah LiPo battery. Planning on adding a sturdy little trailer to hold the panel and some gear underneath.

- 12V 250W Folding Solar Panel designed for camping etc. Seems like you can get these fairly cheaply with a weight around 10kg. From my rough calculations that would be enough continuous power to keep your battery topped up on a sunny day. Something like:
http://www.ebay.com.au/itm/12V-250W-Fol ... SwIUNXFdxO

- MPPT boost controller to take you up to 48v. From what I'm reading here it seems like this is almost exactly what I need, takes the voltage up to 48V nominal but designed for LiFePO4 batteries. Is there is major difference how an MPPT would charge LiPo vs LiFePO4? TO be specific I have LiNiCoMnO2
http://genasun.com/all-products/solar-c ... t-lithium/

How to connect all of that up I'm not sure yet, any pointers much appreciated.

Cheers,
J.

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Re: How to Solar Charge an Electric Bicycle

Post by craneplaneguy » Jun 03 2016 9:04am

You'd be better off with 2 125 watt panels, wired in series. Now you are making twice the voltage, so less "work" for the gensun. Use three panels in series if possible, and babysit the voltage and no controller should be needed, less weight and money spent and perhaps greater charge rate. You lose at least 1%, more probably, involving a controller, but then the MPPT thing probably makes up for that, and then some.

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Re: How to Solar Charge an Electric Bicycle

Post by LockH » Jun 03 2016 9:38am

I'm fortunate to live in an urban world I guess, with 120VAC electrical outlets all around me. So any efforts to install solar panels... just leave `em installed somewhere (in a "best" location) and feed any/all electricity generated into the "grid". Means I don't carry any additional weight around (or any more aero drag) to burden energy stored in any batteries on the bike. Have (pocket-sized, tiny) charger, will travel.
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Re: How to Solar Charge an Electric Bicycle

Post by craneplaneguy » Jun 03 2016 3:11pm

At the moment, I'm charging all three of my 11.5 AH 52 volt batteries to 100%, using my grid tied solar system. They will be used for tomorrow's fun 80 miles away, riding around a 8,000' high basin surrounded by 10 and 11 K' peaks. Point is, my solar array will stay home! But I am fascinated with those wanting to do it on the road, it's just unfortunate the state of the art in solar equipment still makes it a pretty cumbersome arrangement. But, it's less impractical then I would have imagined just a few weeks ago, thanks to the info I've gotten here.

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Re: How to Solar Charge an Electric Bicycle

Post by LockH » Jun 03 2016 7:20pm

In northern Chile, ebikers get to solar charge for free. "Chile Producing So Much Solar Energy It’s Giving Electricity Away for Free"
http://ecowatch.com/2016/06/03/chile-solar-energy/

8)
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Re: How to Solar Charge an Electric Bicycle

Post by LockH » Jun 03 2016 7:27pm

"Bionic leaf turns sunlight into liquid fuel"
https://www.sciencedaily.com/releases/2 ... 151837.htm
Date: June 2, 2016
Source: Harvard University
Summary: Scientists have created a system that uses solar energy to split water molecules and hydrogen-eating bacteria to produce liquid fuels. The system can convert solar energy to biomass with 10 percent efficiency, far above the 1 percent seen in the fastest-growing plants.
Image
we designed a new cobalt-phosphorus alloy catalyst, which we showed does not make reactive oxygen species," Nocera said. "That allowed us to lower the voltage, and that led to a dramatic increase in efficiency."
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Re: How to Solar Charge an Electric Bicycle

Post by LockH » Jun 08 2016 10:24am

Next up, EVen the EVil car manufacturer Toyota is buying in (again) to solar:
"Toyota’s new Texas headquarters to get 25% of power from sun"
http://greenvehicles.automotive-busines ... 16-4914713
Toyota will use solar panels at its Texas headquarters, which is currently under construction, in order to get 25% of its power from the sun.

The company claims that the 7.75MW system will be the largest office-site solar installation in Texas among non-utility firms.
(Hopefully lots of plugins for ebikers.) :wink:
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Re: How to Solar Charge an Electric Bicycle

Post by Modbikemax » Jun 13 2016 5:38am

LockH wrote:Next up, EVen the EVil car manufacturer Toyota is buying in (again) to solar:
"Toyota’s new Texas headquarters to get 25% of power from sun"
http://greenvehicles.automotive-busines ... 16-4914713
Toyota will use solar panels at its Texas headquarters, which is currently under construction, in order to get 25% of its power from the sun.

The company claims that the 7.75MW system will be the largest office-site solar installation in Texas among non-utility firms.
(Hopefully lots of plugins for ebikers.) :wink:
Just enough to run the air conditioners and water coolers. Maybe they should just try opening the windows to let in some fresh air.

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Re: How to Solar Charge an Electric Bicycle

Post by LockH » Jun 20 2016 7:18pm

Omaha Nebraska Solar powered bike station
http://www.wowt.com/content/news/Solar- ... 14581.html
PAPILLION, Neb. (WOWT) -- It's probably one of the smallest bike shops you can find and it's prepared to make its grand opening in the metro, just in time for the College World Series. Bill Moore is the guy behind Quikbyke. He says it's the first of its kind.

"Omaha is our pilot program. I live here. Where else would I want to do it, right?” said Moore.

It’s a bike shop with battery-powered bikes. The batteries help propel the bike, especially when you have trouble getting up hills. He said it’s the technology that makes this idea so unique.
Image
"Why the container? Because we want to be able to move this with the seasons. January in Nebraska is not a time most people want to ride a bicycle,” Moore explained.
:mrgreen:
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Re: How to Solar Charge an Electric Bicycle

Post by Ozzzz » Jun 25 2016 8:16am

midnightcheese wrote: http://genasun.com/all-products/solar-c ... t-lithium/

How to connect all of that up I'm not sure yet, any pointers much appreciated.

Cheers,
J.
I have this one but for lifepo4 it looks to be charge at a few V higher (56.8v54iirc?) than the max Voltage of the 15a/48v lipo battery.
Iv'e been looking for a step down convertor that would allow MPPT charger with reasonable efficiency (especially if eg. 12v panels were in series) and get the voltage down closer to 52/54. I'm sure this has all been covered in scattered trials here.

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