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I live in Managua, Nicaragua. I´d like to know in-depth information about DIY cooling solar deployment.

I was finally able to go through the webinar recording. Very instructive!

Iron

Thank you very much Mr. Gabay!

Iron

Good introductory presenatation. Thanks Jon.

Iron

I suspect lead-acid batteries would be best, especially for long term storage, highest energy. May not be the most environmentally friendly...

Iron

Don't know which kind of regulator is best for p-v system.

Iron

Consumer use, that is...

Iron

First use of solar? probably solar powered calculators.

Iron

Some enemies of p-v systems? Wind, heavy rain, snow, hail.

Iron

Catching up on this week's course.

Iron

Hello from Beaverton, Oregon.

Iron

Hi Jon  a good presentation.

Iron

Was the first use of solar cells with the space program?

 

Iron

Good morning from Mobile, AL

1000watt from sun. Taking that energy from sun and taking it from earth's needs. are we stealing solar energy from our nature?

Nothing is for free. who and when will pay for that energy. How it will affect nature. We have sick example when our enviroment (oil /natural gas/ water/ now is the sun) are abused?

Thanks, excellent presentation

Platinum

how to calculate the output from a photo voltic cell

Platinum

what is the principle behind phot voltic cells

Platinum

@ajaykp Give these guys a call I have worked with them before and they have lots of solutions for water pumping with solar panels. Sun Pumps Inc, www.sunpumps.com.

Iron

thanks Jon and Ann, see all later.

Iron

Interesting....very informative!!!

Iron

Thanks for answering the questions. Nice Lecture

Iron

Thank You Everyone. Hope you will join us tomorrow...... ---Jon

 

Iron

'I am working with a non-profit group and want to install a solar pump (about one HP).  Can you run a pump directly with enough solar cell without having  inverter or costly converter?'

 

It is possible but not a good idea. Some motors can run well as the input voltage and power vary but  I would suggest a battery large enough to handle the pump with at least 3x reserve capacity. typically a battery recharges more slowly than it charges. If the pump needs to operate at night, then even more reserve power is needed.

 

Iron

I am working with a non-profit group and want to install a solar pump (about one HP).  Can you run a pump directly with enough solar cell without having  inverter or costly converter?

 

Iron

I think I addressed all the question. If there are any still unanswered, pelase chime in and repaste...


Thanks - Jon

 

Iron

"Since inverters are usually the first point of failure, wouldn't this make maintenance costs of the system increase? Wouldn't it also increase the overall lifetime cost of the system as well as have additional downtime as inverters fail?"


I don't know what the most common failure modes would be. It could be the inverters, but it could also be the solar panels themselves.  There are reports that many of the eastern manufactured solar panels are failing early in the field. This could be a manufacturing problem, but can also be a nightmare for facilities.

 

Iron

Answer to question 4 -- Lead acid batteries are envornmentally the best. They are much less toxic that lithium based cells, and 90% of all the material in a lead acid (or gell cell) battery is competely recylcled.

They also have pretty good energy densities.

 

Iron

Answer to question 3 -- Switching regulators are best since they can accept a varying input voltage range and operate at rather high efficiencies.

Iron

'Do you envision the thin film materials improving in efficiency?  I like the idea of the "solar shingle" but the low efficiencies don't make as much sense as conventional panels.  A film that can double as a building material or automotive coating is attractive.'

I hope thin film technology improves in efficiency but I often get disheartened. I have been seeing press announcements for almost 30 years about how company 'x' or comapny 'y' found a better way of making them that boasts very high efficiencies. They all promise to have real product soon, but, unfortunately, I don;t see it ever emerge.

It seems solar technology is kept at a price point and and a payback point to discourage all but the most steadfast environmentalists.

 

Another point to keep in mind. There is a carbon footpront needed to manufacture solar cells. For example, it may take as much or more energy to mine the elements, refine them, fabricate the solar panels, ship them, and install them, then all they energy they will deliver in their lifetime.

 

 

Iron

I have been told that large photovoltaic installations in Europe are moving towards using many smaller inverters vs. a single large inverter (or mutiple larger inverters) to minimize system interruptions; and apparently using many small inverters will also increase the usable power from the same size system.

For example, a 1MW ground mounted solar farm using 20, 50kW inverters vs. 4, 250kW inverters.

Can you provide some insight to this?'

 

I kind of like this approach. It is more fault tolerant, and you can use smaller lower cost inverters that can be very efficient. You can even turn off inverters that are not being used. You also don't know everyone off when you do service or maintenance.

 


Since inverters are usually the first point of failure, wouldn't this make maintenance costs of the system increase? Wouldn't it also increase the overall lifetime cost of the system as well as have additional downtime as inverters fail?

Iron

'in thin film it the cost benifit options provided by instaltion that give you more cells with less support materials'

Thin film can be attractive with lower cost and easier manufacturing, and you can get more cells for the same cost, but the lower efficiencies may mean that the output power is around the same.

 

The fleixibility and transparency are nice though and let you place them where mono and poly crystalline cells can't go.

 

 

Iron

about question 1. my first exposure to solar cells was artist impressions of a small "mirror" covered ball that were thre first satellites. Yes, I was a technology nerd.

Iron

@ajaykp  A friend of mine did the DIY solar panels and ended up spending alot more than he bargained for after the glass, epoxy, framing material and not including the time (most of a day), he was about $3.00 a watt for 200 watts.  I found a bunch of Sharp blem panels that I bought for my house and got them at .50 a watt. Too bad Sharp is out of the picture now.

Iron

'

I have been told that large photovoltaic installations in Europe are moving towards using many smaller inverters vs. a single large inverter (or mutiple larger inverters) to minimize system interruptions; and apparently using many small inverters will also increase the usable power from the same size system.

For example, a 1MW ground mounted solar farm using 20, 50kW inverters vs. 4, 250kW inverters.

Can you provide some insight to this?'

 

I kind of like this approach. It is more fault tolerant, and you can use smaller lower cost inverters that can be very efficient. You can even turn off inverters that are not being used. You also don't know everyone off when you do service or maintenance.

Iron

Answer to question 2 -- enemies of photovoltaic cells are wind and hail. Severe Ice can be a problem too.

 

Iron

Answer to Question 1 -- Most people were first exposed to solar cells in little calculators and low power devices like temperature displays.

 

Iron

'Good Lecture.  How are the in panel dc/dc converters modifying the cost and complexity of both battery and grid tie systems?'

The converters are DC to AC for both inverters and grid tie. Individual panels are more expensive with grid tie since they may tie directly to the house AC supply and have the grid tie inverter built in. Using solar panels in banks can reduce the cost of the grid tie inverters a bit. But, grid tie is still cheaper than battery based. Batteries are very expensive and so can be charge controllers.

 

 

Iron

@DougieB and Ann, May I suggest that question be prefaced with the ? question mark so that Jon can scan for posts that have to be answered?

Gold

I have been told that large photovoltaic installations in Europe are moving towards using many smaller inverters vs. a single large inverter (or mutiple larger inverters) to minimize system interruptions; and apparently using many small inverters will also increase the usable power from the same size system.

For example, a 1MW ground mounted solar farm using 20, 50kW inverters vs. 4, 250kW inverters.

Can you provide some insight to this?

Iron

in thin film it the cost benifit options provided by instaltion that give you more cells with less support materials

 

Iron

'Jon, will you be discussing more detail about inverter and phase syncing methods? Or should we work with professional installers for such?'

 

I would do online proce comparisons, but also talk to installers. There are pure sine wave inverters which are best but much more expensive. Modified square wave inverters are fine for lights, but have problems with motors.

 

Instead of using a central inverter, I designed and built a dynamic energy switching system that could measure how much power any zone needed and provide that energy from an 'energy pool'. Each zone had it;s own battery to handle power needs until the micro could react and send power to drive the load and recharge the local battery.

 

Iron

Maybe tomorrow Jon/Ann could read the questions outloud and have Jon answer questions outloud instead of us having to try and decipher all of these posts and ignore all of the well-minded "Thanks, Jon, for the wonderful information"-type posts.  Just sayin'

Iron

@mellcorp Check with your local power provider for power buy back and check for rebates too.  When the buy back is more than you consume, rarely will the power company pay retail for the power.  It is generally what they pay wholesale to their "distributor".

Iron

'If the install MUST be off grid (i.e. cabin in the woods), which of the technologies would you reccomend? Money is not the most important, performance and reliability are.'

It depends how reliable your utility providier is. I live in a rural area and when I lose power,  it is typically gone for over a week. An off grid system or hybrid system is best in my case.

 

The same may be true for your cabin. If the utility can do a service call and get 50 houses back online, the service call that gets one or two houses back online goes to the end of the list.

 

 

Iron

Do you envision the thin film materials improving in efficiency?  I like the idea of the "solar shingle" but the low efficiencies don't make as much sense as conventional panels.  A film that can double as a building material or automotive coating is attractive.

Iron

You mentioned about home made solar cell.  How do I educate more on the home made cells?

 

Iron

ThanksJohn - sorry I missed so much of it, but i did go thru the slides earlier. I hope for more info on the power buy back,an some utilities paying less than retail.

Iron

Coops are an excellent way of evening out costs and benefits. I have seen coops that use renewable energy that are reliable, lower cost, and insensitive to geopolitical issues.

Iron

Installed grid tie systems (without battery backup) are generally between $3.50 and $6.00 per watt depending on the size, mounting style and type of inverter used.

Iron

If the install MUST be off grid (i.e. cabin in the woods), which of the technologies would you reccomend? Money is not the most important, performance and reliability are.

Iron

Jon, will you be discussing more detail about inverter and phase syncing methods? Or should we work with professional installers for such?

Gold

the problem i face with exotic materials is not the acqusition but the epa regulations that come with it

Iron

"Are rare materials like Teluride likely to get harder to procure with todays global tensions?  Do you see this as a limitation of advancing technology?"

 

I would assume so. There is only so much of any rare earth materials so the scarcity of something is a concern. Many of the rare earth materials are in the east and middle east regions. Hopefully, we will find more in our back yard.

 

Iron

Thanks Jon

Goog info

 

Iron

Greetings from Cloudy Minnesota

 

Iron

Thank you very much.

Iron

As a hobbyst, how and where  can I get solar cell at  $1 per watt.

Iron

The way power companies credit and charge varies widly.  We have a coop locally that pays the customer the price they pay wholesale for any you produce over what you use, but gives a one for one credit for any before that and doesn't charge taxes or line fees for the KWH you cancel.  A nieghboring coop has the same but charges the whole amount then credits the energy produced so you still pay taxes and line fees.  The city power here pays nothing for over producing.

Iron

Indeed where is the chat located?

 

Iron

Good Lecture.  How are the in panel dc/dc converters modifying the cost and complexity of both battery and grid tie systems?

System costs  vary quite a bit. I am now seeing 1$ per watt as a standard goal to fixate on. The choice of topology (grid tie, battery, or hybrid) will affect cost. I would suggest getting some competitive quotes from local installers and solar stores.

Iron

Interesting.  Good presentation thanks.

Looking forward to tomorrow

 

Iron

Very interesting.  Thank you very much.

Iron

Ann, Where is the chat located?

 

Iron

A clear exposition. Thanks.

 

Iron

Are rare materials like Teluride likely to get harder to procure with todays global tensions?  Do you see this as a limitation of advancing technology?

Iron

The larger the system the less expensive it is.  DOE is projecting a $1/watt cost in 2017.  Right now we are at about $2/watt installed for the largest systems.

 

Excellent presentation!  Thanks

Iron

Thanks for the lecture. I'll be back tomorrow!

 

Iron

You are very welcome.

Iron

Very good lecture thanks Gilbert

Thanks much, great presentation, see you tommorrow

 

Iron

Nice opt level summary.

Iron

Good class.  Thanks.

Iron

Thank you Ann annd Jon

Iron

@gwp2, what devices did you use for your xy tracking system?

Gold

good lecture/intro

Iron

Thanks Jon for your interesting presentation

Iron

Thanks for the lecture, Jon!

 

Iron

Jon

very, very interesting topic.

Thabk you,

Iron

Nice Lecture, thanks

Iron

My company, Solectria Renewables, offers some nice FREE PV training for grid-tied inverter systems.  Google "Solectria String sizing webinar" if interested.   

How much this system basically cost?

Iron

Thanks.  Nice introduction Jon.

 

Jon! appreciate if you talk some about the tracking systems and gice us some resource references.

Iron

Designed a xy tracking system 30 years ago for solar applications.  Used same technique used to focus laser beams.

 

Iron

We are now on Slide 20

Blogger

Most houses are 240 single phase

 

Iron

220V is _split_ phase for homes.

Gold

Minnesota requires that utilities pay full retail for customer generated power.

Iron

Sorry to be late, got side tracked

 

Iron

(i.e. what are energy inputs of the end to end manufacturing process and disposal process)

wooden based batteries

Iron

No idea aboutthe chargeable battery.

Iron

We are now on Slide 19

Blogger

Agree depends on lifecycle analysis.  What are side effects of obtaining raw materials, what are the energy inputs, etc.

Zinc -air batteries -- almost no pollution!

 

Iron

Re batteries...loaded question/depends on lifecycle analysis? Or am I overthinking?

Iron

lead acid; can be recycled?

 

Iron

Disterb and Observe for finding the global maximum power point and ncremental inductance for constant regulation locally around the global max.

Iron

Guessing that Lead Acid batteries are most environment friendly. The Lead can be recycled.

Gold

We are now on Slide 18

Blogger

John's question was: What types of batteries are best environmentally and why?

Blogger

Maximum Power Point Tracking (MPPT)

Iron

I suspect that a boost/buck regulator gives the best regulation range for real-time loads

Iron

measuring V, I and Temperature with PWM control

Iron

We are now on Slide 17

Blogger

MPPT regulation

 

Iron

John's question was: What type of voltage regulator is best for drawing energy in real time from a photovoltaic panel?

Blogger

Test & calibration systems

Iron

Ageing of plastic film

Iron

Question: Any specific Battery for saving the solar energy?

Iron

True strikes result in vaporizaton etc.

 

Iron

Lightning flash (indirect)

Iron

We are now on Slide 16

Blogger

Lightning strikes

 

Iron

Icy rain another enemy

Iron

Guessing that salty air and dust would age photovoltaics.

Gold

dust or out here sand.

Iron

Corrosion is a big enemy of PV's.

Iron

We are now on Slide 15

Blogger

there must be a better format for audio

Iron

We are now on Slide 14

Blogger

Had a photovoltaic powere calculator many many years ago

We are now on Slide 13

Blogger

Nope, not going to happen today, I am on an old P4 that is a little finickey.

Iron

We are now on Slide 12

Blogger

@tblack_pe  You do not need Real Player.

Iron

We are now on Slide 11

Blogger

Unfortunately I cannot get my sound working.  Do I need Real player to hear?

Iron

We are now on Slide 10

Blogger

Solar photovoltaic caculator.

Iron

We are now on Slide 9

Blogger

No slides here....audio dropping out now.

 

Iron

early photovoltaic cells on satelites and space probes?

Iron

Early use in photography.

Iron

Remote power supplies/chargers with batterys for RTU's, space applications

Iron

We are now on Slide 8

Blogger

calculators and battery chargers

Iron

First use I remember is light meters for photography.

Iron

How are slides accessed?

 

Iron

We are now on Slide 7

Blogger

Opto diods, optic sensors

Iron

Door open/close sensor

 

Iron

We are now on Slide 6

Blogger

John's question was: Before home energy use,  how have photovoltaics been used by consumers?

Blogger

John's question was: Before home energy use, how have photovoltaics been used by consumers?

Blogger

We are now on Slide 5

Blogger

FYI, I can't get the audio - it may be my comany's fire-wall interferring.  I'm using IE 8 and I do get an "errors on page" message.  I'll download the replay after the lecture.

Iron

Hello from Bremen, Gr

Iron

Bad Audio, it continue to break out.

Iron

We are now on Slide 4

Blogger
@ccrider = Is your flash player updated with the current version? Also, some companies block live audio streams, so if that is the case for your company, the class will be archived on this page immediately following the class and you can listen then. People don't experience any issues with the audio for the archived version.

I am also having issues with audio. I hear for a few seconds andthen nothing.

Iron

Audio living for me.

 

Iron

Hello from Inglewood, CA

Iron

We are now on Slide 3

Blogger

No audio.  And I am using Chrome and refreshed more than once

Iron

We are now on Slide 2

Blogger

We are now on Slide 1

Blogger

Hi all -Audio is live! If you don't see the audio bar at the top of the screen, please refresh your browser. It may take a couple tries. When you see the audio bar, hit the play button. If you experience audio interruptions and are using IE, try using FF or Chrome as your browser. Many people experience issues with IE. Also, make sure your flash player is updated with the current version. Some companies block live audio streams, so if that is the case for your company, the class will be archived on this page immediately following the class and you can listen then. People don't experience any issues with the audio for the archived version.

Hello from Toronto, Ontario!! 

Iron

Hello from Milwaukee!

Iron

I have no volume only the slides

Iron

Hello from Albuquerque

Iron

Hi from Calgary Alberta

Hello from Long Island.

Iron

hello from Dixon Ca.

 

Iron

Good morning from Hemet, CA

Iron

Good evening from Iasi, Romania

Iron

hello from north of Boston

Iron

Hello from sunny Southern California

Iron

Hello from SW Michigan

Iron

Greetings from Boston Metro West. A very pleasant & sunny 66 Deg F.

Iron

Hello from soon to be rainy Albuquerque.

Iron

Hello from Chihuahua, Mexico

Iron

Hello all. from sunny Stuart, FL. Im looking forward to learning about alternative energy.

Iron

Greetings from Midland Tx

Iron

Be sure to follow @designnews and @DigiKeyCEC on Twitter for the latest class information. We encourage you to tweet about today's class using the hashtag #CEC.

Blogger

Please join our Digi-Key Continuing Education Center LinkedIn Group at http://linkd.in/yoNGeY

Blogger


Hello from partly cloudy Atlanta.

 

Iron

Greetings from Philadelphia PA

Hellow everyone, good morning.

Iron

Good afternoon from Northeast Wisconsin

Iron

Hows everybody doing? How your day going?

Iron

Aloha from Montana. It's cool after a welcome rain.

Gold

Hello from Sunny AZ (although it is currently raining, just nice and steady).

Iron

Hello from Summerville, SC.

Iron

Good morning from hot sunny Texas where we have lots of sunshine for harvesting energy

Iron

Good morning from Everett, Washington...

Iron

Hello from Sunny SE Lake Simcoe Ontario Canada

Iron

The streaming audio player will appear on this web page when the show starts at 2 PM Eastern time today. Note however that some companies block live audio streams. If when the show starts you don't hear any audio, try refreshing your browser. If that doesn't work, try using Firefox or Google Chrome as your browser. Some users experience audio interruptions with IE. If that doesn't work, the class will be archived immediately following our live taping.

Blogger

Hello all from a very fall feeling Edmonton, AB. Leaves dropping and blowing across the street this morning.

Iron

Be sure to click 'Today's Slide Deck' under Special Educational Materials above right to download the PowerPoint for today's session.

Blogger

Hi from Panama City, FL.

Iron

Hello from the Windy City

Iron

Guten Morgan!

Buenos Dias!

Good Morning It is sunny and finally quit raining in North Pole near Fairbanks

Iron

Good....(checking).... Afternoon from Montreal!

Iron

Good afternoon from Brick, NJ

Iron

Good day from Huntsville, Al.

Iron

Good morning from Scottsdale AZ

Iron

Morning from Portland Oregon

Iron


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