Perry,
My conversion is underway and almost complete. Details here:
http://visforvoltage.net/forum-topic/motorcycles-and-large-scooters/587-my-kz750-electric-motorcycle-project
I am expecting about 10-12 miles range, and 5-8 hard riding. What is crucial
in accurately estimating range is to look up power timetables from the
battery manufacturer. For example, those for my batteries can be found here:
http://www.bb-battery.com/productpages/EVP/EVP35-12.pdf .
I am planning to see how much extra power and range I can get out of the
batteries by pre-heating them.
Garret Maki:
Now you don't want to take them to 100% DoD if you want more than 50
cycles out of them so lets say 80% which is still hard on them.
I don't mean to discredit what you are saying, but do you have any data to
support this? And how do you define 100% DOD?
Maybe there is a common misconception about what 100% DOD actually means. It
does not mean the battery is completely "dead" which is very bad. 100%
discharge is usually defined as ~10v. This means you stop discharging when
the voltage reaches this threshold. As you can see from the above spec
sheet I posted, my batteries should survive >250 100% discharge cycles.
Probably a little less, as cycle life tends to diminish with higher
discharge rates. Note the following data from Hawker on Genesis batteries to
demonstrate this:
Cycle life at 25 degrees C
@ 15 min rate: 250 for 100% DOD and 2.45 vpc charge for 16-12 hrs w/initial
inrush current as high as possible
350 for 80% DOD (charged under same conditions)
@ 3 to 5 hr rate: 400 for 100% DOD
500 for 80% DOD
Regards,
Andrew
