stationary Bicycle Dynamo for recharging battery
stationary Bicycle Dynamo for recharging battery
(OP)
I've got a battery Lithium-ion, 12 hours life, 68Wh.
I'm going to use a bicycle to get around, but I'll be in remote areas so need some way to recharge it.
Solar power is inconsistent.
I've decided to use the bicycle chain removed from the rear wheel and attached to a dynamo, with a little stand for keeping the bicycle stationary.
Being a novice with electronics I need some advice.
I've read that a blocking diode is required to stop the battery from powering the dynamo.
Do I need a specific type of dynamo, for my battery?
How long will it take me to recharge this battery - is this a realistic idea?
I'm going to use a bicycle to get around, but I'll be in remote areas so need some way to recharge it.
Solar power is inconsistent.
I've decided to use the bicycle chain removed from the rear wheel and attached to a dynamo, with a little stand for keeping the bicycle stationary.
Being a novice with electronics I need some advice.
I've read that a blocking diode is required to stop the battery from powering the dynamo.
Do I need a specific type of dynamo, for my battery?
How long will it take me to recharge this battery - is this a realistic idea?





RE: stationary Bicycle Dynamo for recharging battery
You will be astonished at how fast you will get tired.
Mike Halloran
Pembroke Pines, FL, USA
RE: stationary Bicycle Dynamo for recharging battery
But I won't be doing cycling during the day, just some light walking.
The days I do cycle will be to get to a civilised area with power supply and then take a bus/train to my next remote location.
I'll also have two batteries, so can use one say for a day or more. Do a half charge (perhaps not ideal for the battery life), and use the second battery while recharging the other.
I could charge in evening, then finish in morning (after 4 hours sleep).
I'm quite fit so this would not be a significant challenge.
Thanks for the info.
RE: stationary Bicycle Dynamo for recharging battery
http://www.sinewavecycles.com/products/sp-sv-8-dyn...
"You measure the size of the accomplishment by the obstacles you had to overcome to reach your goals" -- Booker T. Washington
RE: stationary Bicycle Dynamo for recharging battery
Just running those simple two little 10 watt light bulbs (no LED's!!!) was a real drain.
yes, you can get energy out. It will be real energy, and I hope you feel better doing it. It will be emergency short-term power if you have a power failure.
But it will not be enough for anything but emergency re-charging of very, very small appliances like a cell phone or radio.
A portable outside solar panel (to prevent theft!) (1 meter x 1 meter, or 2 ft x 4 ft at least) hooked to a simple re-charging circuit inside re-charging a deep-cycle 12 V battery will give better results over a two or three day period. Add a 12v/120 volt AC converter to recharge/use a few simple 120 v loads.
RE: stationary Bicycle Dynamo for recharging battery
It will be in the evening after a days light walking.
I've found this which I believe may suit my needs:
http://pedalpowergenerator.com/products/belt-drive...
RE: stationary Bicycle Dynamo for recharging battery
I wouldn't want to do _that_ every day.
Mike Halloran
Pembroke Pines, FL, USA
RE: stationary Bicycle Dynamo for recharging battery
With just a quick look at the part you linked, I would say you will need to add a major amount of mass to the outer diameter of the bicycle wheel for it to be usable. You need momentum in the system to smoothly transition between pedal pumps.
RE: stationary Bicycle Dynamo for recharging battery
At remote location, I can set up my bike for recharging over 1-3 days (where I will be walking around, without the need to use the bike).
Well I did kind of want something where I could simply unhook the chain and move it over to my dynamo - quick relase wheel is easier than deflating the tire & removing the outter rubber.
So long as it works.
RE: stationary Bicycle Dynamo for recharging battery
I need it for a 68Wh battery (12 hour life), how long do you think it
would take me to charge?
This depends on how strong you are. The average person can do about 120
watts per. Hr. this is 120/12=10Ah.
If I multiply my batter 68Wh by its life 12 hours, then this
equals 800 roughly.
Average person can generate 120Wh, I can
probably go a bit higher. Do you think this is correct?
RE: stationary Bicycle Dynamo for recharging battery
RE: stationary Bicycle Dynamo for recharging battery
Thanks.
RE: stationary Bicycle Dynamo for recharging battery
But have you looked at off-the-shelf systems, like: http://www.econvergence.net/The-Pedal-A-Watt-Bicyc...
Its weight appears to be only about 2/3 that of your dynamo, and it includes an inverter and the hardware to connect to your bicycle.
TTFN

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RE: stationary Bicycle Dynamo for recharging battery
Given that it's only 68Wh, it seems to me that it would be far easier to carry spare batteries. 14.8V LiPO batteries with 5 Ah capacity only weight about 0.5 kg, so given your weight allotment for the generator, you could carry 30!!! LiPO batteries.
TTFN

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