I'm building a custom mobility cart based on a race car. The cart weight with rider to be around 400lbs. It will have 12in dia tires. It will be driven on flat ground with occasional light grades. I want to go 20 mph max (occasionally). It must have reverse. I would like at least 1 hour of ride time. The majority of riding will be at half speed or less. I want the anodized twist grip set and a handlebar mount brake lever with parking brake. I would like to have an adjustable power device so I can power it up the ramps (riderless) into my vehicle without fear of run away. My other scooter has a "jackrabbit" adjustment that does this very well. It controls the max speed and thus the power to the motor. Is there such a feature as a motor brake that auto brakes when the throttle is reduced to off. My PRIDE scooter has this also. It helps when loading as well. Can a technician put the kit together and test it if I come to your offices? What is the freewheel feature?
Do you have any ideas which Voltage motor and battery pack you would like to use?
After I sent my e-mail, I found that 20mph is pretty unusual and reasonably not attainable. Let's change that to 10-15mph or whatever speed will get me to the 500 watt motor, two batteries and reverse contoller. Forget the adjustable power and freewheel.
Lowering the top speed from 20 mph to 10-15 mph will cut the weight and cost of the parts in half. I made gear ratio calculation using both a 65 tooth and 80 tooth wheel sprocket. The 65 tooth sprockets gives a 15 mph top speed and the 80 tooth sprocket gives a 12 mph top speed. Here are the calculations:
If it was my cart I would use the 80 tooth sprocket because I prefer hill climbing torque over top speed. However both gear ratios are acceptable to use with a 500 Watt motor. For a one hour ride time on flat ground with the occasional light grades I recommend using two 12V 22Ah batteries.
I can put together a kit for this project. I need to ask some questions before I make the kit so I can narrow down which parts to include.
You've punched my button. This sounds a lot better. Please proceed with a kit with the following:
1. Motor with base (Mot 24500x2500B)?.
2. Panel mount key switch.
3. Handlebar reverse switch
4. 80T rear sprocket, although I'm using the Azusa taperlock hub on 1in axle
and will probably buy their sprocket. Chain will be #25? Does the motor sprocket
with 11 teeth and chain have wear problems being so small?
5. Full twist throttle set, anodized Blue (THR 124)?
6. Include brake lever LEV-26
7. Include Volt Meter Met-120V-blue
8. Include Brake cable CBL-101 and BRK-228 adjuster
Let me know if these additions/substitutions are compatible. Do I need a circuit breaker/fuse or is one included? Let me know what the total cost will be and when
the kit will be ready. I might drive up from Orange County to pick it up and pick your brain some more.
As long as the #25 chain is kept well oiled and is not run dry then it should last a long time.
We always include a fuse holder and fuse with each kit. Kits usually take us around 1-2 business days to build after the order is placed and if it will be picked up locally then we will let you know when it is ready.
We are in Santa Cruz County which without traffic is an 8 hour drive from Orange County however if you feel like making the trip then you are welcome to pick the kit up in person, or we could have it shipped to you with FedEx. I went ahead and made the kit which is linked to below.
Please let us know if you would like any changes or additions made to the kit.