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admin | Category: Best Rated Elliptical | 03.02.2016
We’ve seen some ingenious ways to generate electricity in the past and using exercise machines as electricity generators is one way which is gaining popularity in recent years. The school has retrofitted 20 Precor elliptical exercise machines to generate electricity using technology from ReRev. Though the output is considerably small, a person pedaling 30 minutes would generate enough energy to run a laptop for an hour. Many of us have been to the gym and wondered why the exercise equipment isn’t hooked up to generate electricity and feed it back into the grid. When you work out on standard exercise equipment in the gym, all of the kinetic energy you generate is completely wasted on the machine.
With a ReRev system a 30 minute workout on an elliptical cross-trainer will generate around 50 Watts of power, which is enough to power a CFL bulb for 2.5 hrs, to charge a cell phone 6 times, to run a laptop for 1 hour, or a desktop for 30 minutes. So far ReRev has installed the conversions in around 180 machines around the country in university athletic centers and gyms. Please note that gratuitous links to your site are viewed as spam and may result in removed comments. I worked on this concept two years ago and promoted this idea where it could be used by individuals for purpose of exercising and at the same the main target was to look into the possibility of this concept to be tried out where the poor and unemployed could get paid for the power they could generate individually or collectively. I would double check your units though, I think that a 30 minute workout would generate energy, given in Joules or Kilowatt-hours.
Given the desire to shrink its carbon footprint, many gyms have begun to retrofit cardio machines with energy-producing generators. Cardio machines -- stationary cycles, treadmills and ellipticals -- generate resistance while you exercise. When you rigorously pump the pedals of a power-producing stationary cycle for an hour, you’ll only produce 50 to 150 watts, says Gibson.
You can build a stationary cycle that will be more efficient and less expensive than commercial power-producing machines. Hitting the gym is about to get a whole lot greener as SportsArt Fitness just unveiled an energy-generating exercise machine that produces watts as you work out!
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First, he makes his mark developing high-speed electronic connectors, then he becomes a sustainable developer. Mechanical engineer gets his undergraduate degree online through a unique program at the University of North Dakota and reaps the benefits. Just four short years ago, Hudson Harr was a 21-year-old freshly minted college graduate armed with electrical and mechanical engineering degrees from the University of Florida.
Harr’s efforts paid off, as he went on to found a multi-million-dollar company ReRev in Clearwater, Florida to produce fitness machines that generate electricity, and he now serves as its president. Actually, Harr is one of a trio of entrepreneurial engineers that have started companies in the last four years to develop and market these fitness machines, each taking a unique approach.
The Green Revolution retrofits onto existing machines such as these exercise bicycles in a spinning class. People argue that an individual machine doesn’t generate enough power to make a difference.
Many of us may remember using a generator mated to the rear tire of a bicycle to power front and rear lights as we pedaled along.
It turns out most exercise equipment already comes with a generator on it to power its display. It varies by company, but typically, the DC power coming off each machine is wired to a central processing unit containing an inverter, and this box in turn is connected to the building’s electrical system and ultimately the grid.
To give an idea of how much power humans can crank out, a person in decent shape can generate 60 to 120 watts during an hour of strenuous exercise, and an elite cyclist can average 300-400. But while the benefits of exercise machines that produce power in a group situation may seem obvious, developing and marketing them has proven an uphill battle. Their original concept was to build bikes with the generators on them, but when they held focus groups with club owners, the owners made it clear they didn’t want to buy all new equipment. For engineering, The Green Revolution uses Gyre 9, an outside consulting firm in nearby Oxford, Connecticut with which they’ve forged a strategic partnership. As another unique aspect, Taggett is testing a way of connecting the machine’s output directly to the power grid without going through the wiring, conduit, and boxes found on other systems.
Their inverter scheme incorporates silicon-controlled rectifier (SCR) regenerative control, according to Taggett.
But Taggett likes to talk about perhaps the most innovative concept with his machines, one that has multiple machines driving a single generator -- the team approach.

Henry Works uses two electronics engineering consultants in designing the Human Dynamo machines, one for circuit board layout and buildup and the other to handle software code (C++).
In detailing ReRev’s operations, Harr says the firm has a 15,000-square-foot production facility staffed by15 employees, including Keith Beaver, a mechanical engineer, and Dave Desilva, an electrical engineer. The outlook for electric-power-generating exercise machines looks bright, according to Harr. Henry Works: Mike Taggett, CEO, says he has started a new division called Griffin Materials to make products from recycled rubber and plans to hire engineers more for that than exercise machines. University of Oregon is the latest to witness the change where workout sweat is being converted into useful watts. The energy from these 20 machines installed in the Student Recreation Center is converted from DC to AC before being transferred into the grid. However, if not completely making a house power using off-grid electricity, the system can be used to keep some gadgets off-grid, or can be coupled with other renewable energy systems such as solar panels or a wind turbine. At long last a company in Florida called ReRev has answered our calls, converting existing elliptical machines into sources of power. It’s certainly not a new idea to transform that kinetic energy into electrical energy, but up until recently nothing was commercially available.
When you add up all the people coming into the gym throughout the day and using these machines, you could produce some serious power! Next in line to get the human-powered machines is Furman University, whose Senior class is currently raising funds to get 15 installed at their Athletic Center. I think every little bit can make a difference, especially when added up by many people participating - and we as a globe are many poeple after all - part of the problem of too much resource use these days! Using the elliptical would generate a given amount of power (Watts) at any given second, because power is a rate of energy conversion. She previously covered developments in theater for the "Dramatists Guild Quarterly." Tang graduated with a Bachelor of Arts in economics and political science from Yale University and completed a Master of Professional Studies in interactive telecommunications at New York University. Because these machines only generate a small amount of power per user, gyms connect many machines and users to recoup the cost of the generators.
By replacing the friction drive of the standard cardio machine with a chain drive and adding a flywheel, you can boost the energy generated. Butcher has already outfitted his home with a 2.5-kilowatt solar array and is a net supplier of power to the local utility.
The company’s new S770 Pinnacle Trainer features a kinetic energy-generating design that feeds excess electricity back into the power grid.
The new machine also has a monitor for heart rate, and it is completely powered by the kinetic energy generated during a workout – all one needs to do is start exercising. He had a vision: to create an exercise machine for health clubs that would generate net electrical power. And he has expanded his reach by applying the same renewable energy technology to commercial solar and wind power applications, creating a second company called Sunquest. They find themselves creating a new industry, one that combines physical fitness with renewable energy. Increasingly, such machines are free standing in that the generator supplies all their electrical needs.
If a person averages 75 watts (about one-tenth of a horsepower) for an hour, they will produce 75 watt-hours of energy.
He recalls, ”While working out one day, I started to calculate the amount of energy expended at the gym. The full-service engineering firm knows electronics for building circuit boards and electricity for the generators and grid-tied equipment. For starters, they added hand cranks to go with the leg cranks to provide a rigorous upper-body workout and generate additional electricity. Taggett has worked with industrial designers on the aesthetics of the machines and with another engineer or two on SolidWorks CAD modeling.
The system looks great, but the University states that the amount of electricity produced is so small that about 3,000 people a day pedaling on 20 machines would generate enough electricity to power a single house and it would take about 28 years to recoup the investment. Now when you hit the gym, you can burn off those calories while creating some renewable energy for a carbon negative workout. ReRev’s system easily converts existing equipment into power generating machines, so when you step on and start moving, most of your energy generates DC power. Recently, energy generated by a set of elliptical machines at the University of Kansas powered the basketball court during a game! So this leads to my question: How can I help my gym (Planet Fitness) adopt these machienes, even if on an experimental basis?
For a single user at home, the meager power output makes the generator expensive from an economic standpoint.

San Jose-based David Butcher constructed a pedal generator that resembles a stationary cycle and provides the same workout.
So what little extra power he needs, he produces in a morning workout on his pedal generator.
The machine can generate up to 2,000 watts during use, and it can potentially save up to $3,000 in utility bills each year.
Operating out of his mother’s house, he amassed a collection of parts and cobbled prototypes together. Such a concept has been viewed as a novelty for a long time, but now it’s going mainstream and becoming a serious entity. New technology enters the picture in the form of inverters and controllers developed for renewable energy applications such as solar and wind power systems. Harr reports, “Gym equipment over the last few years has transitioned from alternators to generator-based drive trains. With this, someone using the exercise machine can vary the difficulty of their workout and the power they produce.
As a reference, ReRev says 50 watt-hours of electricity can power a CFL (compact fluorescent light) bulb for 2.5 hours, a cell phone charger for six full charges, a laptop for one hour, or a desktop computer for 30 minutes. He worked as a river guide and started a business making an eyeglass retainer he invented in the off-season called Chum, a little tubular fabric retainer with elastic in the ends. When a person first gets on a Human Dynamo, the FIGG acts like a motor, taking a small amount of electricity from the grid to power up the bike. They have installed systems at many colleges, with their largest fleet, 30 machines, at Texas State University. Just think of the implications of a CHAIN having these machines, not just isolated cases and universities for example.
However, you can build a cheaper pedal-powered energy generator, which can power some home devices and partially offset your electricity bill. An external generator can replace the resistors and take in the DC power produced by the machine.
If you exercise an hour per day for 30 days at 100 watts per hour, you’re shaving 30 cents per month off your electricity bill. If the technology of power-producing machines takes off and millions of people use them to generate a small amount of energy, total energy can be significant.
Most aerobic equipment, including stationary bicycles, Stairmasters, rowing machines, and treadmills, can be configured to generate power to the electrical grid as people sweat.
In most cases, existing machines are retrofitted, but some companies have designed new machines from the ground up. In the late 1980s, “I had the idea for our trade show booth to have a converted exercise machine that would generate electricity so we could power a blender or lights or something just for fun. Once the pedals begin spinning, the FIGG turns back into a generator, and the controls convert DC power from the generator to AC power, as usual. Given the expense of the machine, it may be more economical to invest in other energy-saving measures, such as solar panels or insulation. Investors perceive this technology as similar to compact fluorescent bulbs or solar power -- dismissed early on but now becoming more mainstream. By their rotating nature, alternators and generators generate AC power, and components within them convert it to DC.
When a user starts pedaling, the batteries charge, and when they hit 28 volts, the inverter kicks in and sends power to the grid, converting 24-volt DC to 110-volt AC. The twist: power flows through a wall socket into the grid, like plugging in a normal appliance. You can also connect several cardio machines to one generator -- a system that appeals to gyms.
But they found that the ten-speed bike wheel just didn’t have enough mass from an inertia standpoint. Some companies have custom-designed power-producing exercise machines, but they'll make a bigger dent in your wallet. So Sternberg found one of those big metal turning wheels from a lock on a river that weighs 80 to 100 pounds.

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