phrbob93
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what if i use multiple number of 9V battries?
Then divide the number of hours by this multiple number. So for multiple number=4 you need 4 shoes to walk (close together - perhaps a big animal?, carrying the Li-ion accu + electronics) for 10 hours. Provided that these piezo shoes can actually deliver 9V @ 500-600mA, each.
A piezo provides an extremely low current when it is stepped on. If each shoe has a piezo in it then the extremely low current occurs only in pulses for half the time. An Energizer 9V Ni-MH battery is 175mAh.what if i use multiple number of 9V battries?
could you explain me that on what biases you are saying that i need four 9V batteries and together they would take total 10 hours to charge the 25.9 V battery ? i need some more detail
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If LiPo has I*t= 5.5Ah then energy storage is V* I*t = 25.9V*5.5Ah = 142Wh > x3600= 511,200 W-s= Joules
By comparison your 9V primary battery is only
9V *0.6Ah *3600s/h =19,440 Joules
Thus your LiPo ( ignoring charger type inefficiency ) will take 511,200/19,440=26 times longer charge time with 26x more energy storage.
This example using PZT sensor created 1W peak and 0.25W average at 1 footstep per second or an average energy of 0.25 Joules
If each step was 1m, then you would need to walk 511,200 x2m if only on one foot to fully charge the LiPo cells.
Always analyze specs before you try to design something and start with an energy source, converter and load to identify where all the losses are . THis is called a power budget spec. ( simple list)
Do you think you can walk 1000 km to charge up the battery? i.e. Round trip from Mumbai to Ahmedabad or roughly from Toronto to New York City and Google says you can make the round trip walking in 204 Hours ( not counting stops)
Next consider another power source and battery size and make a list of specs.
a priori for any good design
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