Recent content by Tfisher309

Thank you. It has been a joy to ride. Around town it is far superior to my gas bike. I wrote up my observations a while back in another post. "End of a successful riding season".

I put a 20s 74v 50ah lithium ion battery with BYD cells. I wasn't looking to build a battery and I couldn't find a LiFePo battery that would fit and have a fast enough discharge rate. I am happy how it turned out.

Good to know about the differences in rim sizes. I looked up the leaf bike motor and the dropout spacing wouldn't work, I need 150mm. I have been talking with Buchanan Spokes and they tell me there is no good way to lace a big hub motor to my old 16 inch steel rims. Too steep of angle and not...

Since I am needing rpms I assume the motor will be 72v. For a brake I will use whatever disc will bolt to the hub I buy. After hours of looking it seems the 3000w qs 205 50H V3 is the only hub motor that checks the critical boxes. Plus it's 150mm dropout works. The drawbacks are weight...

My 1964 Sears Allstate is needing a hub motor. With virtually no suspension or brakes I am not looking to break any speed records. My target is 40mph cruising, 45 max.. The problem I'm facing is motor rpm. The 16 inch wheels, which I want to keep, will require a 625 rpm motor (if i did the math...

Outstanding information. Thank you harrisonpatm. This certainly gives me something to think about as I consider scaling up my system to include an electric car. I realize that when you transfer electricity there is a loss, but where is it going? My Kill-A-Watt meter says my 84v 8a charger is...

The batteries on the cart are 12v 100ah lifepo4. The bike battery is 74v 50ah lithium ion. I try to keep the bike battery between 72 and 82v. That gives me two days of riding (about 30 miles.) I rarely charge it all the way full. The bms shuts off at 83.6v.

I watched the video and can see the improved efficiency, but when charging my bike battery how would the boost converter know when to go into absorption and float stages? Would I rely on the bikes bms to shut things down?

Good comments, thank you. The gears are the primary drive gears from the old Sprint motor. From that angle it looks like the fender would hit the battery, but it doesn't, even at full compression. Since this picture was taken I did move the battery back closer to the motor. The inverter is...

Having just pulled my battery for winter storage. It is a good time to share the experience I had with my electric motorcycle. First I would like to thank all the people who provide content on this forum. I could not have built the bike without your information. The bike is a 1967 H-D Sprint...

The green one in the first photo is exactly the one I bought. I don't think I will have any tip-over problems positioning it in my yard for max sun exposure.

Thanks Wolf, you are the man. You put me out of my misery with the first five paragraphs. I just went to Harbor Freight and bought a garden wagon to mount the equipment I'll need. I have only had the bike on the road for two days, but already I like riding it. I'm calling the bike "Back to...

Thanks amberwolf So, the current will flow from the solar battery to the battery on the bike even thought there is more wh in the bikes battery. ( In general this is the hard part for me to get my thick head around.) I understand the need for the inverter and the charger.

Thank you for your thoughts. I have some testing to do, but I'm sure the bike is using less than 100wh/mi. The bike weights 240 lb and I am riding in city traffic using regen for much of the braking. I am curious about this and knowing for sure will help me plan my project. I have a question...

Good information, thank you. If I can gain 1000w every two to three days I am good. I know my proposed system is weak, but it only needs to cover, at most, 40 miles of city driving a week. Other applications for the battery and inverter could be electric lawnmower, boondocking with small...