Custom builds or home-built electric motorcycles

I built an electric bike, took me two years but I did it. Took it around the block and everything.

I haven't finished my motorcycle conversion yet but I am close so I figure I'll ask ahead of time. How do you wire an amp meter? I will have a 48 volt system with a 200 amp fuse 300 amp controller, 300 amp motor (peak). I know I need a shunt, I plan on getting a 200 amp one, but how do you wire it up.

Hello folks, I'm working on a conversion of my moped from the SLA to LiFePO4. Everything has gone well except accelation and range. The moped is considerably worse than before. I want to know if it is normal for a 1500W hub motor moped to drop the voltage from 57.8V to approximately 42V when starting from a flat surface? The controller is set to not pull more than 30A and 36,8V from the battery. I have charge the pac about 15 times since I installed it. The voltage of each cell is 3.62V-3.67V and 3.05V-3.16V after a 20 min drive.

So I am wondering about a couple of things, what would happen if I hooked up a 24 volt charger to four 12 volt batteries which I have connected in series for a 48 volt system, would it charge them just slower, or not at all?

Also I heard of guys using four trickle charger to charge four batteries, does that mean they disconnect them in order to charge them, or do they just charge them all at the same time?

Which brings me to my Subject question, can I connect two 24 volt charger to four of my batteries and charge them that way, would that give me a 48 volt charge?

I am looking for a basic yet detailed diagram of how to wire an electric motorcycle. What I have seen so far are diagrams of what I would call very advanced designs which leave me wondering if the person who is sharing the diagram with us is showing off or actually believes it can help others.

I like to take baby steps, so I am not interested in how to wire the entire bike with the regular components such as the headlight, horn, tailight, turn signals, etc you get the idea or with the latest in LiFePO4 battery configurations with a nuclear flux capacitor - jk

I tried searching for this question and only found ones related to overvolting the motor. So here it goes. What should I expect if I hook up five 12 volt batteries (60 volt total) to a 48 volt controller. I have the MARS motor and it can handle 72 volts easy, so I am not worried about the motor, but what will the controller do? Will I just be wasting volts or will I fry the controller?

Are there any motor controllers that will feed into a computer? I am looking at some options to make a hybrid, including having multiple motors and it would be very convenient if I could find a controller that would be connected 24/7 (not just during programming time) to a computer that would tell it to slow down, speed up, etc.

Hey Guys,
First off, I'm a new user to the site, and I'm hoping you guys can help me out.
I've found a 1973 honda cb750 without a motor that I'm looking to convert into a complete electric with a top speed of around 40mph and a range of 30-50 miles. I've never done anything like this before and I wanted some advice.

does anyone have first hand knowledge of this hybrid battery moped?

So this is my new project

You can see details at http://motoelectrique.unblog.fr

Here, I made two important PCB :

- the main one with two microcontrolers, one for main fucntions (alarm, inputs/outputs controls, OLED datas, aux LED datas), the other control keyboard and speed

- the second PCB replace cycle analyst and CellLog8S*2 so it look at every group of cells so the main PCB can draw curve at discharge or charge, measure current too.

Others PCB:
on display you have also 2 PCBs, one for OLED control (not mine but 4DGL) , one other for audio preamplifier (OLED) and slave controler who , for example, control high power LED highligts

Here is a picture in low beam position (high power LED gives 2*100W equivalent classic light in high beam position) . You have also blue LEDs