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  1. T

    Lifepo4 battery needed for qs138 70h v3

    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".
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    Lifepo4 battery needed for qs138 70h v3

    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.
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    Hub Motor Dilemma

    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...
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    Hub Motor Dilemma

    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...
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    Hub Motor Dilemma

    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...
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    End of Successful Riding Season

    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...
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    End of Successful Riding Season

    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.
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    End of Successful Riding Season

    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?
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    End of Successful Riding Season

    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...
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    End of Successful Riding Season

    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...
  11. T

    Charging with portable solar power station

    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.
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    Charging with portable solar power station

    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...
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    Charging with portable solar power station

    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.
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    Charging with portable solar power station

    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...
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    Charging with portable solar power station

    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...
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    Charging with portable solar power station

    I would like to build a portable solar powered charging station for my bike which has a 74v 50ah battery. The wagon I will use will mount a 200w 12v solar panel, a 30a controller, a 12v 100a lifepo4 battery and a 1000w invertor along with my 84v 4a charger. Am I correct thinking this setup...
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    Riding in the Rain

    Good stuff. I'm West-Central Illinois and the rain can come out of nowhere. Especially if it is warm out. I hadn't thought about the throttle and good idea not to let water get trapped where it won't drain or dry.
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    Riding in the Rain

    It will be spring before I can ride the electric motorcycle I am building, but I got thinking of something. Here in the mid-west it is not possible to ride a motorcycle without occasionally getting caught in the rain. Does anyone have experience with this or ideas on how to prepare the bike? Is...
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    Newbee with some basic electrical questions

    Thank you, very good information. The learning curve where I'm at is pretty steep, but things are gradually making sense. This forum is awesome. I would not have been able to what I'm trying to do without it.
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    Newbee with some basic electrical questions

    Sorry to bother you.
  21. T

    Newbee with some basic electrical questions

    There is nothing I can do about my 8ga cables. I just don't understand why they aren't the same size as the ones coming from the motor. Is it OK to use a 48v circuit breaker in a 72v system? It seems it would be OK because amps are what is being measured.
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    Newbee with some basic electrical questions

    I have a 50ah battery that can supply 150a continuous and 300a peak and a controller that can handle 120a continuous and 200a peak. Here are a few things that I don't understand: The cables from my battery to controller are 8ga. Shouldn't they be as big as the wires from my motor? I have a...
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    Lifepo4 battery needed for qs138 70h v3

    Thanks again. This information gives me much to think about. Up until now I didn't know enough to ask questions. I was hoping to buy the battery this fall, but with winter coming I really don't need it until spring. In the meantime I'll look into the possibility of building a battery myself.
  24. T

    Lifepo4 battery needed for qs138 70h v3

    Thanks for the info. This forum has been great for a newbees. Maximum size battery can be is 250x250x425mm, or 10x10x17. Because this is just a city commuter bike, no freeways and no long range requirements I would like to go with a Lifepo4 battery. Another company says they can fit 24s8p in...
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    Lifepo4 battery needed for qs138 70h v3

    After a month of looking LiTech Power has worked the hardest to come up with a battery for my bike, but I don't know if it is strong enough. I hope some of you with more experience can look at the specs and give me an opinion. QS138 70h v3 cont 67a max 150a Votol em-150...
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