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…)
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…)