Had a discussion about something similar. “Why don’t we take all the energy created in fitness studios? People constantly push pedals there!”
It’s just so phenomenally little it doesn’t make any sense, a full routine wouldn’t even full charge a smartphone battery (not even close). Put solar on the studio roof instead.
I’d assume it’s the same with these. Apparently the idea was even abandoned when it was applied to cars on highways, even those don’t produce enough energy by driving over it to justify resources and maintenance.
It’s just so phenomenally little it doesn’t make any sense, a full routine wouldn’t even full charge a smartphone battery (not even close). Put solar on the studio roof instead.
I think you’re wrong on that one. E.g. when cycling, 100W for 15 minutes is achievable for most people, which corresponds to 25 Wh of energy. To charge a modern phone you need about 15 Wh. So if your overall system efficiency is at least 60%, which seems realistic, you’d be able to charge a phone with that.
I guess it’s just not financially viable. Because those 25 Wh would still correspond to less than 1 cent in value (at 0.3€/kWh).
Cycling and rowing machines are probably the only practical options for that - they both have intentional friction brakes to dissipate energy, because they are actually efficient enough to need them.
Treadmills still need to put power in because of the friction, and most weight or spring machines rely on you absorbing the energy you just put in (unless you drop the weights…)
A few small commercial gyms have implemented this, as well as the gym at Brown University. Brown estimates that the power generated by its 50 machines is about comparable to what’s generated by the solar panels on the roof of the gym. So it’s not nothing, but gyms tend to be cavernous and expensive to run, so it’s a drop in the bucket, unfortunately.
More unfortunate still is that the takeaway is almost always, “ugh don’t bother, it’s basically nothing” and not, “wait, why are we burning so much fuel to power this room?”
Had a discussion about something similar. “Why don’t we take all the energy created in fitness studios? People constantly push pedals there!”
It’s just so phenomenally little it doesn’t make any sense, a full routine wouldn’t even full charge a smartphone battery (not even close). Put solar on the studio roof instead.
I’d assume it’s the same with these. Apparently the idea was even abandoned when it was applied to cars on highways, even those don’t produce enough energy by driving over it to justify resources and maintenance.
I think you’re wrong on that one. E.g. when cycling, 100W for 15 minutes is achievable for most people, which corresponds to 25 Wh of energy. To charge a modern phone you need about 15 Wh. So if your overall system efficiency is at least 60%, which seems realistic, you’d be able to charge a phone with that.
I guess it’s just not financially viable. Because those 25 Wh would still correspond to less than 1 cent in value (at 0.3€/kWh).
Cycling and rowing machines are probably the only practical options for that - they both have intentional friction brakes to dissipate energy, because they are actually efficient enough to need them.
Treadmills still need to put power in because of the friction, and most weight or spring machines rely on you absorbing the energy you just put in (unless you drop the weights…)
A few small commercial gyms have implemented this, as well as the gym at Brown University. Brown estimates that the power generated by its 50 machines is about comparable to what’s generated by the solar panels on the roof of the gym. So it’s not nothing, but gyms tend to be cavernous and expensive to run, so it’s a drop in the bucket, unfortunately.
More unfortunate still is that the takeaway is almost always, “ugh don’t bother, it’s basically nothing” and not, “wait, why are we burning so much fuel to power this room?”
https://www.cyclingweekly.com/news/latest-news/olympic-cyclist-versus-toaster-can-forstemann-toast-a-slice-of-bread-video-175175