Its been a few days since doing any work.
This part of the build is somewhat out of my realm, so its been, all about learning, searching and deciding.
What would or should work regarding my, power and battery choice.
The decision to take the path I'm taking, is a result of input from those that contributed,
SO, if
ANYTHING goes wrong it's
YOUR FAULT !
Learning
Doing my best to learn all the contributors have offered, I've reviewed the suggestions, here as well as on Endless Sphere.
Taking the suggestions, learning the details, of each comment/suggestion, and trying to apply the results to this project.
Not everything has come easy. Some of it has stuck, and some has not.
So with out further ado, here's what is happening.
Because of the limited space under/behind the seat, the type of motor and especially the battery size, comes into play.
I looked into using a golf cart motor, differential, steering, and electrical. This option though seeming practicable,
would have required changing the frame, and adding another +/- 400 lbs. (Including a minimum of three large batteries)
So after a little thought that idea was dismissed.
I've learned just enough to probably be a danger to myself.
Learning about the motor sizes, in volts, wattage's, amps. battery requirements, charging needs, and associated parts.
What each of those things mean, in weight, power availability, and what each of those things mean in dollars and sense, ...I mean cents!
Battery Choice
I always thought I would use a battery something like this:
https://www.google.com/search?q=48+...ome..69i57.28614j0j7&sourceid=chrome&ie=UTF-8
But I thought the AH should be higher. Enter Nissan Leaf Batteries.
https://www.techdirectclub.com/sola...n-3-5-kwh-66-amh-w-option-and-1-bms-lot-of-7/
I would never have thought to use recycled car batteries. I guess there is quite a market for them.
At only 8 lbs each module, they pack quite a punch. 8 volts, 500 watts, and 66 ah, per module. ( I will need a bank of seven )
(With the vehicle gross weight factor rising, the high 'amp hour' of these batteries is desirable, another reason I may use them.
Seven modules is +/- 56 lbs.
Yes the cost is getting up there. I did however anticipate, and mentally budget for, this phase of the project.
I originally estimated it would be around $1000- 1500, so I'm within my budget. (Motors and batteries combined)
The battery (+/- $500-600 ) cost is roughly the same as, or less than li-ion batteries of similar volts and watts.
For my use, the size and shape of these batteries, will allow different placement configurations.
Searching
Next was to look at the types and sizes of motors, Whether one motor or two motor system. A system that would satisfy the requirement, of attaining 20 mph within 1 mile, while not exceeding the requirement of 25 mph.
Because of my still limited understanding, of how all these electrical components work,
I wanted to stay with getting matching components. Extra money...maybe.
Deciding
I'm working with TDPRO on putting together a package for, motors/ controllers, sprockets, wiring, throttle, chains, etc.
https://www.ebay.com/itm/48v-1800w-Brushless-Motor-Speed-Controller-Foot-Pedal-Reverse-Switch-Chain-Sproc/303024861914?_trkparms=aid=111001&algo=REC.SEED&ao=1&asc=20140107094819&meid=ca2ca9f32eb3427db2ff2e32ae5eff99&pid=100039&rk=1&rkt=4&sd=303024861914&itm=303024861914&pmt=1&noa=1&pg=2054436&_trksid=p2054436.c100039.m2059
The pre-order cost is currently at $525, not including battery/charger.
I'm waiting on their reply, to my order update this morning.
They must have worked only half a day, because it's Saturday.
Gearing
I used the calculator,
https://electricscooterparts.com/motorwheelgearratio.html,
to help determine what gearing I will need to meet the speed requirements.
Calculator Input Parameters
Motor Speed.................................. 4500 RPM
Motor Sprocket ….......................... 9 teeth
Jackshaft input Sprocket ….......... 24 teeth (special order pilot bore)
https://simplybearings.co.uk/shop/p...procket-for-8mm-Pitch-Chain/product_info.html
Jackshaft output Sprocket …........ 11 teeth
Axle shaft Sprocket ….................... 54 teeth
Tire Height ….................................. 24 inches
Speed and Gear Ratio Calculation Results
Top Speed: 24.62 mph
Gear Ratio: 13.09 : 1
Jackshaft required to reduce the motor speed to the drive axle.
This configuration is only the first thought, without having the actual motors on hand to see what fits where.
That's it for now. Anyone see anything glaringly out of place, give a shout.