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Thread: ZX1 lithium ion battery retrofit

  1. #61
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    You know what kills me is this; "The iGLIDE will retail for approximately $7,900, with a percentage of that cost expected to be covered by insurance." This is a reason to look at using the words "personal transporter" or the like. I'm glad that maddog finds his chair satisfying. But this one sentence from a wheelers support magazine infuriates me. Of course I have no shoulder power just pain, at all so that iGlide is out anyway.

  2. #62
    Senior Member maddog's Avatar
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    Nonoise, the kit comes with everything you need to connect everything together and comes with good directions. You can order the battery already put together and I think they will align the batteries in a custom configuration if you ask them. I don't remember them offering the pre-assembled batteries when I ordered, I will go that route if I ever need to do it again.

    Bob, have you looked at the Calb batteries, looks like a good deal. 60ah batteries at 24v for $700 is a good price. Are you upping your ah's and or volts or are you wanting to stay the same as what you have now? http://headway-headquarters.com/lithium-lifepo4-cells/ These would keep you from going parallel and simplify things greatly if are wanting to stay around 60ah. They also have 100ah batteries but that would bump your cost up a lot.

    Question about charging in parallel. The BMS I have stays attached to the battery and charges each cell individually to 3.2 volts. My nimh iglide battery has two 20 sub c batteries in series, they are combined at the ends in parallel and charged with a 24v charger. In a parallel Lifepo4 system would you cross connect at every cell and use the same BMS to charge 2 or more parallel cells at a time or would that not truly balance the 2 cells? Would you need one BMS for every parallel leg to truly charge each cell?

    I looked at the charger you mentioned and I need a simple plug and play unit because my help would never be able to use it. Also the ability to download data is nice but not something I would do on a regular basis, the whole charger is overkill for my needs.

    For a quad like me that wants to be in a manual chair but is not strong enough it is a great chair. I think everyone loves the chair while pushing, but for people who transfer it into a car it is just too heavy. I drive from my chair and never transfer out during the day so weight is not an issue.

  3. #63
    Those Headway 40’s, 40152, are big cells. The battery pack I just bought has 21 19’s 19650 cells. 40mm and 19mm being the diameter of the cell. As such my 19 mm cells make up a 7S3P battery. That means (you probably know this), three Parallel sets of seven series strings of cells. The included internal BMS worries about proper balancing.
    I have had periodic paralysis all my life. I lost my ability to walk in 2011 beginning with a spinal block, which was used for a hip fracture caused by periodic paralysis.

  4. #64
    Senior Member maddog's Avatar
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    I was going to use the smaller cells but I have had problems with cells failing in my 40 cell nimh packs (20s2p) and its impossible to find the bad cell without totally taking it apart. I decided 8 larger cells would be simple and I can easily check and replace any cell if there ever was a problem.

  5. #65
    I wish we'd spoken earlier. The bonus of swapping out a bad cell and being able to make the pack fit the available space are big pluses. However right now I am dead in the water without a thumb throttle that works for the 24 volt system I am playing with.
    I have had periodic paralysis all my life. I lost my ability to walk in 2011 beginning with a spinal block, which was used for a hip fracture caused by periodic paralysis.

  6. #66
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    I know I have seen thumb throttes in my internet wanderings, I will try to find some of them.

    sincerely BS

  7. #67
    Senior Member maddog's Avatar
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    Nonoise, what are you putting this battery and thumb throttle on?

  8. #68
    It's for my personal transportation device. I'll try to post pictures. You will recognize where the idea came from.
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    This is the working 36 volt version. It has an on off switch, a thumb throttle, and a hands free cruise control.
    I have had periodic paralysis all my life. I lost my ability to walk in 2011 beginning with a spinal block, which was used for a hip fracture caused by periodic paralysis.

  9. #69
    Senior Member maddog's Avatar
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    Nice work, why did you switch to 24v? Too much speed?

    Are the thumb throttle and cruise two separate systems, meaning do you have to get to a certain speed with the thumb throttle and then set the cruise or do you press the + button from a standstill until you reach your desired speed? Is the thumb throttle just for short burst when you don't want to set the cruise? Have you thought about maybe a slide throttle similar to a dimmer switch that would stay at a certain speed and not spring back and would be easy to quickly change speed or stop? Or maybe a dial like on a fan.

    I really like what you have done here. A system like this would work better for me than the marketed system because you tell it to go vs sensing to go. If I am stuck in the grass and can't move a system like yours could be told to help. Otherwise I am just struggling and not moving and not getting any help.

    I am an engineer and grew up on a farm and was always building things growing up. I love to see things like this from people. One of my former attendants couldn't understand why I was always tinkering with my things and why I didn't just buy new. She could not understand that new is expensive and not always better, of course she also tried to model her life after the "Real Housewives".

  10. #70
    Maddog, I want to see if I have better control at startup with 24 volts. You know how quick electric motors are out of the starting gate, I’m hoping 24 volt will give a slower acceleration. I broke the unit you see in the picture and had to rebuild it. I had just opened the garage door to go inside after tooling around the neighborhood. Our driveway is on an upward incline. I immediately got flipped over backwards, bumped my head even. It was quick, had a dickens of a time recovering and getting my act back together. So I decided 24 volts might be a little kinder. But I am probably through *that * learning curve now, so I may be good to go if this other system won‘t come together.

    The throttle and cruise share the same wires into the controller. However the cruise cannot start the motor. The way it works is that one uses the throttle to start and run and then you tap cruise if so desired. Cruise will then maintain that speed handsfree. And it will adjust speed depending if +/- are pressed. To stop all one has to do is tap the cruise word, or tap the throttle, or flip the ignition off.

    I like your idea of a slide throttle, but I have not the skills to make one. I don’t know how this stuff works. I took one of the throttles apart. All that was in there was a return spring and a couple of fixed magnets.

    I haven’t tried it, but these little rollers I have probably would not be so good in the grass. They are the best I could find. For your purposes in the yard, you could simplify this and leave out the added omni wheel discs. Instead figure out a way to put a balloon tire directly on a hub motor. Steering might be a problem on concrete, but on slippery surfaces, it should work.

    I chuckled your not buying new stuff. I totally understand why.
    Last edited by nonoise; 11-05-2014 at 07:15 PM.
    I have had periodic paralysis all my life. I lost my ability to walk in 2011 beginning with a spinal block, which was used for a hip fracture caused by periodic paralysis.

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