What if you needed a wrench and, when you tried to buy one, you found that they were all the same size? How many problems can be solved with a wrench of only one size? Eventually, you would have to find other ways to solve problems, and you would relegate the single-sized wrench to the class of projects that happened to be compatible.
Much the same is true of today's solar solutions: They come in one size (large, flat plate-glass modules) and are suited primarily to the task of capturing the sun in large open fields. But what about all the other places where energy is either unavailable or not cost-effective? Solving that problem requires wrenches of different sizes and even different shapes. The one-size mentality does not fit all problems, and in fact, a wide variety of alternative and embedded forms are required to really address the potential for solar energy to address the world's energy needs.
Let's look at the problem of needing electricity where it simply isn't available. Solar technology can be integrated into the wings of unmanned aerial vehicles for both military and civilian uses, increasing flight times dramatically. How about charging that cellphone and iPad we carry everywhere with us? Flexible sheets that can be right-sized to fit our portable devices could provide tens of watts of power everywhere we go. And no plug is required.
In the developing world, the need for energy is extreme. In fact, many researchers believe that economic and social prosperity starts by ensuring a ready and adequate supply of energy. The sun shines all day long -- why not build flexible charging mats that can provide kilowatts of energy in an area that's no bigger than a small patio? A 10x10-foot mat could be easily rolled up and stored but provide more than 2kW of energy generation capability when unfolded and exposed to the sun. Even a solar mat the size of a queen-sized sheet would provide 1kW.
In much of the developing world, the primary source of energy generation is either centralized coal power plants or decentralized diesel generators. Why not deploy hybrid diesel systems that use the sun to generate power during the day and only consume diesel at night? The problem of intermittency goes away completely, while the consumption of costly diesel fuel would plummet. The same technology can be deployed to our armed forces, where the cost of carrying extra fuel or batteries is often immeasurable.
Electric vehicles are another good example. The batteries of today's electric vehicles must be maintained at a specific temperature to maintain their maximum storage capacity and overall lifetime. What happens when an electric vehicle is left parked in the hot daytime sun? The cooling system for the battery system will be drawing energy from the same battery it's trying to cool. In some cases, this could result in a catastrophic discharging of the vehicle's battery, destroying the battery. Why not integrate some flexible solar film into the vehicle's roof to solve this problem? One technology that's almost ready for prime time offers thin, flexible solar film sheets that can be molded directly into the car's glass roofing material and could provide more than 500W.
The eventual solution needs to be thin and light and be able to convert a significant amount of the sun's energy into electricity. Glass-plate silicon-based solar panels are too rigid and heavy. Thin film technologies such as CIGS are inefficient. What's coming are superthin GaAs-based solar cells that can be integrated into other materials. Only then can we realize embedding power everywhere.
Rich Kapusta is vice president of marketing at Alta Devices.
I see what you are saying Rich, but I think they may be on to something - versatility may be key to being able to utilize the technology. Portable units that are more flexible make good sense. It also involves a paradigm shift - people have to get on board. I think renewable energy is only going to become increasingly important, despite its slow start.
Rich - you are right to be skeptical. The industry is going through an interesting time right now, but our technology is certainly different. What we've developed here at Alta, is a solar cell that is thin and flexible, AND ultra-efficient, AND easily manufacturable. This allows us to embed energy generation into things where power, size, and weight matter, while providing a significantly more meaningful amount of power than previously possible. Our target markets are systems that are primarily battery powered and un-connected to the grid in order to extend the usefulness of those systems.
Rich. Reading your article, it appears you're focused mostly on non-grid applications. Is the likelihood of success in those applications any greater than the likelihood of solar-based grid systems?
Charles - that is a great observation, and exactly what we are focused on. Off-grid energy is all about mobility which values size and weight. Many thin film technologies have tried to succeed here, but their low-efficiencies (barely 10%) have prevented them from succeeding. Our ultra-thin technology at 29% efficiency provides significantly more power per kg and per square meter, which changes the game dramatically.
"Solar technology can be integrated into the wings of unmanned aerial vehicles for both military and civilian uses,"
Rich, solar energy is using even in Satellites. I read that there are plans for using solar energy in space vehicles too, for powering the communication and other related devices in equipment bay.
Solar will only take when the time it takes to recover the panel's cost is shorter than 3 years. Right now, most alternative energy options take quite some time to recover initial investment, even with subsidies. Not to get into specifics, but some solar panels in prototype phases are returning over the industries best of a 15% light-energy ratio. When a panel approaches 40% return, then maybe it will take over.
As for energy from everywhere, vibration, sound, heat, etc may play a part in mobile power supplies. We can only hope.
Atwell, as of now for household purpose, the ROI from any solar based investment is 7-10 years (from my experience). I had done a comparative study and found that eventhough we are using low quality/cost panels and devices, then also it will take 5-8 years for enough ROI. But if the power tariffs are increasing, then we may able to get a good ROI below 5 year.
Thin and flexible solar cells may be one of the solar energy waves of the future. We've reported on a few of these in DN. Here's one: http://www.designnews.com/author.asp?section_id=1392&doc_id=248975 and we'll be publishing a post on another one soon. Mydesign is correct, solar panels are used on spacecraft and satellites.
Thanks for all the great comments. Solar has most definitely been used in the space industry for years. What Alta Devices is providing, is a similar (and in some cases higher) level of energy conversion efficiency, at price points and scale targeted at "mobile" terrestrial applications. The ability to embed power into every day materials is what sets us apart from the rest of the industry. We are certainly in an exciting phase in the industry.
The hybrid solar/generator combination the author describes here is what Tokelau is using. That's the 3-island nation that just went 100% sustainable for its electrical need, which we wrote about here http://www.designnews.com/author.asp?section_id=1392&doc_id=254016 I think marrying flex circuit technology with solar cells is a great idea.
Ann, in our country there are some hybrid solar generators are available. Hybrid means a combination of both wind and solar. During day time solar energy is using for power generation and during night and dark time, wind mill will work to generate power. But in both cases, availability of sunlight and wind throughout year may be a concern.
Mydesign, thanks for that input, I wasn't aware of those hybrid generators. At least in concept, they sound like a good idea. In the Tokelau solution, "hvbrid" refers to a combo of solar panels plus coconut oil-based generators for backup and battery charging.
Ann, coconut oils is using for running the generator or some other purposes. Normally we used to have diesel generators, which are using at power cut time, as an alternate source of energy.
The problem I've had with using solar for my lawn mower is that the storage batteries don't last very long. In my application lead acid only lasts about three years. I just repacked with NiMh, hoping to get a little more life, but the cost of NiMh is about 3X of SLA, so it's a hefty pricetag. I realize that solar charging has nothing to do with the short life span of the batteries, but it does make me realize that all alternative energy sources need a better storage medium. Even if a medium drain application had to repack the cells every five years, the cost would be excessive.
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