I'm looking to power a 6 wheeled beach wagon that weighs about 65 pounds and will carry 2 toddlers. I need help coordinating the speed control, 24 or 36 volt motor and charger. If anyone has built one of these I would love to hear what you have done, any help is appreciated.
I just played around with the calculators and came up with the following gear ratio scenario. An item # MOT-24450G 24 Volt 450 Watt gear motor has a 450 RPM maximum output speed and a 9 tooth bicycle chain sprocket. If this motor was used on a wagon with 10 inch wheels with a 36 tooth bicycle chain drive sprocket the maximum speed would be 3.35 MPH. Here is a screen shot of the calculators when I made this computation.
The speed controller and throttle will allow the speed of the power wagon to be infinity variable anywhere between 0 MPH and 3.35 MPH depending upon how much the throttle activated. We have both twist throttles and thumb throttles available that mount onto 7/8" diameter round bars.
I recommend using a 24 Volt battery pack, controller, and motor for the build. This will keep the price and weight of the power wagon down and there is no power advantage to using a 36 Volt 450 Watt motor over a 24 Volt 450 Watt motor, they both have the exact same amount of power, torque, and RPM.
A 450 Watt motor geared to go between 3-4 MPH will have a massive amount of power and torque. It will be able to climb any hill with ease even with a heavy load. You will be able to easily haul loads of heavy bricks or whatever around in the wagon when the toddlers are not on board. You could opt for a 250 Watt gear motor and save a few bucks if you want to, however I would go with a 450 Watt motor if it was my project because it seems like you can never have too much power when you build a vehicle.
As far as the batteries go you could use any size batteries for the project, from small 5 Amp hour batteries all the way up to large 22 Amp hour batteries or bigger. The size of the batteries determines the range that the power wagon will have. If you are only planning on using it for 10 minutes a day then two 12 Volt 5 Amp hour batteries would be a good choice. If you want it to have a longer run time then you will need to go with larger batteries.
Here is a basic wiring diagram for hooking up of the parts needed for an electric power wagon.
I would be glad to make a parts list of all the electrical parts you will need for the project if you could let me know a little bit more about what you want out of the power wagon such as how many minutes a day you want it to run for, how many miles per hour you want its top speed to be, what Voltage you want it to run on, what size wheels you are planning on using, etc.
I too would like to make an electric wagon/cart. I am building it from scratch with the intention to make it very heavy duty and stable with high load capacity.
For wheels, I'm leaning toward a Golf Cart and Tractor Replacement Tire/Wheel Assembly that is 18.5" diameter (8.5" wide on 8" rims).
I plan to install them on a 44" wide go cart axle that is 1" diameter with step down to 3/4" and has a 1/4" keyway.
I don't want to throw money away, but because of my intention for heavy duty, I was thinking I'd step up to one of your 36v/600W motors (36600G/36600PL).
It also seemed that this would offer me a heavier duty chain compatibility.
If you think this overkill, I could go with with the 24v/450W motor you recommend above.
But, sticking with 36v motors with their 10 tooth sprockets, if I go with a 72 tooth drive axle sprocket, I'll have a 7.2:1 gear ratio.
And using your calculator, that will give me 3.7/4.2 mph top speed with those 18.5" wheels, which is probably a little higher than I need it, but should be fine I think.
So, I would appreciate your assistance with motor decision and the rest of the components needed that I can source from you.
P.S. I had an idea that I'm fairly convinced is dumb, but you could probably help me confirm that. The idea was to use 2 electric motors, one for each rear wheel. This would make the cart much more maneuverable and would allow the cart to track properly on turns without rear differential (which I was not planning on doing). But then I come to the conclusion that the cost and complication isn't worth it…
You definitely could use two drive motors, one for each rear wheel. Two drive motors would increase maneuverability and tracking over using a single motor, and would eliminate the need for a differential. If you want both of the rear wheels to be powered then the only choices I can think of are using a live axle, using an axle with a differential, or using two motors independently attached to each rear wheel.
If you click on the kit links below the parts list for that kit will be listed on the page.
Here is a link to a 24 Volt 450 Watt drive system with a twist throttle and reverse. It has 12Ah batteries.
I can change these kits to have whatever battery size and throttle that you want. For example if you want KIT-136 with 12 Ah batteries instead of 8 Ah, or if you want KIT-140 with a twist throttle I can do that. If you would like any changes made to these kits please let me know and I will post a link to a new kit with the changes that you want made to it.