Hey Norm,
The other side of the room is not as scenic.
The power chart above is not as accurate as I would like in the upper end.
I only had an analog meter on it at the time and it was tough to keep pedaling at each constant speed.
The needle would slam passed the limit at each kick at the higher currents, and so the upper 2-3 numbers/points are averages (.707 of max). The chart above is with a 14 tooth driven sprocket. It is now 19 tooth driven.
Not catastrophic, since I believe the numbers in the usable range for the bike are more or less repeating today.
I had intended to record data again, and chart it with the 19 tooth driven that is on there now.
Today, after getting on the bike again with a clipboard - and with the goal to answer your question actually...
I recorded this...
Usually I ride for 40-50min. I cycle between the 1hour and 5 min. durations. When my heart rate is comfortable 120-130 for a few minutes, I 'get off of the bench' and push it a little harder - say 140-150bpm for the 5min. and back again. Sometimes I will go for a burst at 32km/hr 100W rate, but this would only be 3-5 times during the ride at a one minute duration each.
I would guess that I am somewhere between the 63W and 81W marks during the ride - at 28km/hr or 30km/hr. For 50 min run (0.83 hours) is about 60Watt-hrs per day. For 40 min run (0.66 hours) is about 48Watt-hrs per day (if my math is correct). I think you have mentioned that you noticed a difference between what you thought you were putting out (that doesn't sound right
) ahem...
generating and what you were actually generating. Doc Wattson would be good idea for me as well.
I am totally open to improvements as well. I realize that using a DC motor would be something to consider for more output...
However, in the spirit of learning - I'd like to use existing parts and maybe wind and pour a new stator for ~$60 without the 1/8" plus 1/8" plexi glass. Maybe a slightly smaller coil ID with some more (10 = 10%) windings? Right now each phase is 1.8ohms, 100 turns of #20. Looking at the current stator, is there an obvious efficiency pick-up to be had? It seems I do not have a thermal issue yet...
As mentioned I am at about 1:1 with the 48W television. I looked into a small LCD unit that used a 120VAC to 12VDC Xformer, and running it directly off of the bank - but couldn't justify the overall cost.