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Thread: I-Glide battery charge, or Next, even Tailwind

  1. #131
    Quote Originally Posted by maddog View Post
    Ok, I have been putting together a battery with a bluetooth bms to help determine exactly what the iglide power needs are. What I found out was somewhat surprising. The chair pulls 0.4A sitting still which is a little more than I thought it would. Pushing on a hard flat surface draws very little amps, one quick burst of power and then zero amps, less than sitting still. The highest amps I have seen today were around 12A. Lower current draws than expected opens up more battery choices including maybe the Bioenno Power one posted earlier, although a higher amp rating would be better.

    video of bluetooth app while pushing. All of the pushing was done at above walking speed.

    https://www.youtube.com/watch?v=6UFp7TUrQ8U
    Something went wrong opening your link. It goes to youtube and then says "This video is unavailable". I am glad you got into helping solve this little puzzle.
    I am as astounded as you are. But doing gardening I sit pulling weeds and then move a few inches, just enough to keep the motor on. After some time I got to thinking this thing seems to be sucking battery just sitting here doing nothing. But is it? You know how Segways always look like they are in a motion keeping in balance. I think these are doing something similar. Don't push the tires, because they are resisting motion. To do that the sensors are at work. Like SmartDrive sensors can be too sensitive at times. After my first trial with the Watts-Up I got to thinking the best thing is to just shut down every time one comes to a stop which is crazy nuts unless your battery is getting to be on the weak side.
    Last edited by nonoise; 07-21-2019 at 05:36 PM. Reason: youtube
    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.

  2. #132
    Senior Member maddog's Avatar
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    Link has been updated should work now
    https://www.youtube.com/watch?v=6UFp7TUrQ8U

  3. #133
    Senior Member maddog's Avatar
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    According to your Watts-up your peak amps are similar to mine. I found speed effects amps a lot more than I thought it would. Going slowly up the grass hill in the video used less amps than fast on flat grass. I put my front caster up against my car tire and pushed as hard as I could and only used 7A.

  4. #134
    Quote Originally Posted by maddog View Post
    According to your Watts-up your peak amps are similar to mine. I found speed effects amps a lot more than I thought it would. Going slowly up the grass hill in the video used less amps than fast on flat grass. I put my front caster up against my car tire and pushed as hard as I could and only used 7A.
    Yes repeatable results from different methods are nice to see. My max Amp peak was from the previous trial run. We have a very short but steep, maybe even 10% street here I tried to do as fast and hard as I could while watching the meter. Try as I could I only saw something over 11. However it recorded 12.45 Amps peak for the day. That day it also hit a 318.15 Watts peak. My electrically enlightened neighbor thought that was quite a lot.
    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.

  5. #135
    Senior Member maddog's Avatar
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    Quote Originally Posted by nonoise View Post
    However it recorded 12.45 Amps peak for the day. That day it also hit a 318.15 Watts peak.
    Watts = volts x amps
    12.45A x 25.5v = 318 watts

  6. #136
    Senior Member pfcs49's Avatar
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    Quote Originally Posted by maddog View Post
    Watts = volts x amps
    12.45A x 25.5v = 318 watts
    A smart wattmeter would be doing the math in real time, using the actual voltage x current so as to accurately determine "battery capacity used" in Watt-hours.

    At least, that's what I expect. Does the wattmeter have B+ and B- circuit as well as a through-flow/ammeter circuit?
    I run an ammeter/voltmeter on the ZX1 so I can get good info on battery condition, but it would be better to measure actual energy consumed.
    The voltage get's pretty variable, especially as the batteries get used up. The ammeter function is from a coil-ring around one of the main battery cables and there's also B+/B- to power to it as well as provide a voltage signal.
    69yo male T12 complete since 1995
    NW NJ

  7. #137
    Quote Originally Posted by maddog View Post
    Watts = volts x amps
    12.45A x 25.5v = 318 watts
    My battery is currently down to 24.6V. Which by the above, I'll get a shutdown if I try to pull 12.45A tomorrow.
    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.

  8. #138
    Quote Originally Posted by pfcs49 View Post
    A smart wattmeter would be doing the math in real time, using the actual voltage x current so as to accurately determine "battery capacity used" in Watt-hours.

    At least, that's what I expect. Does the wattmeter have B+ and B- circuit as well as a through-flow/ammeter circuit?
    I run an ammeter/voltmeter on the ZX1 so I can get good info on battery condition, but it would be better to measure actual energy consumed.
    The voltage get's pretty variable, especially as the batteries get used up. The ammeter function is from a coil-ring around one of the main battery cables and there's also B+/B- to power to it as well as provide a voltage signal.
    It is calculating Watt hours. My little battery is currently down 79.7 Wh. I'm tracking Amp hours. It is supposed to have 4.3 Ah, but has used 3.0 Ah with a current battery voltage of 24.6. I think it will cut out before 4.3. But what can one expect for $10?

    I meant to add this YouTube to try to answer your questions, but it slipped my mind. It's just over a minute long. https://www.youtube.com/watch?v=GPfqE1fhiGE
    Last edited by nonoise; 07-22-2019 at 01:49 PM. Reason: added YouTube
    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. #139
    Senior Member maddog's Avatar
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    I built a battery and took some pictures during the process, although it looks like I did not take as many pictures as I thought. The battery turned out well but was not easy to build.
    List of supplies
    8 of these https://www.batteryspace.com/high-po...assed-dgr.aspx
    charger https://www.batteryspace.com/smartch...amiyaplug.aspx
    Bluetooth bms 8s lifepo4 30A https://www.lithiumbatterypcb.com/pr...tion-function/
    Box https://www.amazon.com/gp/product/B0...?ie=UTF8&psc=1
    xt60 connector https://www.amazon.com/gp/product/B0...?ie=UTF8&psc=1
    xt60 connector mount https://www.amazon.com/gp/product/B0...?ie=UTF8&psc=1
    Silicone wire https://www.amazon.com/gp/product/B0...?ie=UTF8&psc=1

    I started with an old battery and took everything out and cut it down to just the top and plug. I only needed this to interface with the chair. It looked like this when cut. I also ground off the top half of the back of the plug.
    Attached Images Attached Images  

  10. #140
    Senior Member maddog's Avatar
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    Then I took the box and ground of the small round areas in the bottom. I also removed one of the middle post that holds the lid down. This will leave you with 5 screws to hold the lid. You have to remove the post to make room for the battery cells. The other middle post we taped to the side wall and filled the area between the wall and post with epoxy. After the epoxy dried we cut a hole that matched the plug. Epoxying the post to the wall allows you to save that post because it is mostly attached at the bottom and that area will be removed for the plug. I also cut out an area to the side of the plug for the 2 red and black wires.
    Attached Images Attached Images  

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