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  1. shawname

    Ebike scooter project QS 4kw V3 72v, Kelly KEB72601

    This is Shawn McCarty the developer of BatteryBlocs. I agree with your comments, that the PLA plastic can deform under heat. I first became aware of the issue when a customer in Arizona left a battery in the dash of his car and returned to deformed BatteryBlocs. In response, I switched to...
  2. shawname

    JP spot welder

    OK, I have it connected to the positive battery terminal- I'll change it tomorrow! I didn't read the circuit board silkscreening. Might be good to include a piece of paper showing the connections for guys like me..
  3. shawname

    JP spot welder

    My welder is always live- the copper welding tips always have 12 volts.- Does the circuitry connect to the positive pole of the battery or the negative? Any ideas as to what I am doing wrong? thanks, Shawn
  4. shawname

    Charging a 36 volt Ping battery directly from photovoltaics.

    Yes, I have measured the voltage at the charger. But in a personal email with Mr Ping he recommended that I limit the voltage to 42 to avoid overcharging. I did find this Mppt charge controller...
  5. shawname

    Charging a 36 volt Ping battery directly from photovoltaics.

    Hmm, interesting. It would take 200 solar cells as each one puts out .5 volt. That's a lot! Thanks, but hopefully I can find a simpler solution. Shawn
  6. shawname

    Charging a 36 volt Ping battery directly from photovoltaics.

    I was thinking that if the photovoltaics put out 42 volts max, that as the Ping battery charged, the voltage would also increase, until no current could flow into the battery.. Wishful thinking? I did look for 36 volt charge controllers and fund this: PT 36-5A, 36V here...
  7. shawname

    Home assembled electric Yuba Mundo

    What was the overall average moving speed for the 97 mile tested range? Hi Texas, I was going slow at 12 to 15 mph. I was also pedaling. I was trying to keep the burn below 200 watts/hr whenever possible. Just returned from a fast (18 to 21mph) 40 mile errand and into a strong headwind...
  8. shawname

    Home assembled electric Yuba Mundo

    The newer Yubas have mounting holes for the front basket in the frame. They would be ideal for attaching a fairing. I would try goggles first! I enjoyed your website, keep riding. Now I'm thinking about doing an electric version of yours on my website. cheers, Shawn
  9. shawname

    Charging a 36 volt Ping battery directly from photovoltaics.

    I use a 36 volt Ping battery to power my electric bicycle. The charging steps look like this: Photovoltaics to charge controller to battery to inverter to battery charger to battery management system to battery. A lot of steps, a lot of inefficiency. I'd like to experiment with simplifying...
  10. shawname

    Home assembled electric Yuba Mundo

    Hi Dogman, I didn't want to use the back rack for the battery because I often have Lisa riding, and for kicks, sometimes a couple of adults or the neighborhood kids. I have never had any "slippage" with my front hub motor. It's only 500 watts, for heaven sakes. :wink:
  11. shawname

    Home assembled electric Yuba Mundo

    My thinking exactly. Those panniers get filled often, and I use ALL of the room. For example, I just returned from picking up two 5 gallon propane tank refills. No, it is mounted to the frame, and that makes ALL the difference. If the basket swung with the wheel, I wouldn't have done this...
  12. shawname

    Home assembled electric Yuba Mundo

    I just never tried them on! :shock: I have some on another bike. Ok, returned from measuring. The Planet Bike fenders are 2.25 inches wide, the Fat Franks measure 2.5 inches. If you hold the PB fenders up over the FF's, the outer edge of the FF's protrudes. They look good though, and since...
  13. shawname

    Home assembled electric Yuba Mundo

    :lol: You are right, I used to have a motorcycle with a heavy front fairing with large pockets to carry things, and it was of course frame mounted. Never connected the two. You might think it's a little lame to ride your girl friend around on a bicycle, but she says that she feels "pampered"...
  14. shawname

    Home assembled electric Yuba Mundo

    Hi Ohzee, The Fat Franks are perfect. No rubbing. I paid around $30 per tire, a good buy for Schwalbe's- my favorite tire manufacturer. They have the highest load capacity too. The front basket is Yuba's and is very well built. It seems expensive, but it is very solid. You could probably...
  15. shawname

    Home assembled electric Yuba Mundo

    Hi Chalo, I agree. I built the gear hub into a Sunrim "Big Mammoth", which is very strong. I am not stressing the wheel beyond it's limits, but the inner workings of the hub. I rode a Rholoff hub over 6000 miles since October of last year in Europe and beyond, with no problems. But I did...
  16. shawname

    Home assembled electric Yuba Mundo

    This is my home assembled electric Yuba Mundo. I wanted an ecargo bike that would go 60 miles on a charge and tote a weeks worth of groceries and my girlfriend- all at the same time! My needs were more demanding than the products on the market could meet so I chose to assemble my bike. I...
  17. shawname

    Photovoltaics not putting out enough amps.

    Ahh, so photocells behave as capacitors. That helps me to understand. Dak, I dont' understand musch of what you wrote, sorry. Thanks for your explanations, and I'm sorry that they were beyond my education. Shawn
  18. shawname

    Photovoltaics not putting out enough amps.

    Thanks Dak664 for your xlnt explanation. Can you answer a few questions?? Why is that? It seems that current would flow from the higher voltage of the panels to the batteries. Is it because the panels see the batteries as a direct short? Would the magnetic field be a coil or a capacitor...
  19. shawname

    Photovoltaics not putting out enough amps.

    Sam, You are entirely right. The unloaded voltage was 18.5, no amps. When I shorted the panel and measured the amps, I got 2.2 amps, (cloudy) and 0 volts! I had always thought that the panels wattage was measured by (shorted out amps) X (loaded volts.) That makes sense, doesn't it? It is...
  20. shawname

    Photovoltaics not putting out enough amps.

    I am making progress. I checked the charge condition of my battery array and found one battery flat. This could have been what was making my inverter shut down due to low voltage, especially as it was the last battery in the parallel. I am charging it up now from house current. My other two...
  21. shawname

    Photovoltaics not putting out enough amps.

    shawname: I'm confused, I still don't understand what you mean by "shorting". Sounds like you connect the panel positive lead to the panel negative lead, correct? If so, the voltage would immediate drop from 17.5V to almost 0V. Since the panel provides a relatively constant power (watt)...
  22. shawname

    Photovoltaics not putting out enough amps.

    Good to know even a technician can get lost! I'll try this, shorting each panel out one by one measuring the current, and retesting all the wiring. If I don't find any problems, I will short out the whole array down at the charge controller, and see if the amperage jumps. thank you!
  23. shawname

    Photovoltaics not putting out enough amps.

    Actually I pulled one panel from the array and ran a lead between negative and positive, put it in full sun, and measured the amps. The panel put out close to it's rated amps. The measured voltage of the array at the charge controller is 17.5. I ran 10 gauge multistrand, the max run is about...
  24. shawname

    Photovoltaics not putting out enough amps.

    Hi bobc, I think this is a good way of saying it. So today I am going to remove and short out the leads from my panels down at the charge controllers, and measure the shorted amps. Crazy? If the load is not trying to draw enough current, this should give it plenty of load. I should be...
  25. shawname

    Photovoltaics not putting out enough amps.

    Hi Xanda, They are polycrystalline. The voltage drop at the end of 30 feet of wire is not significant, the wire is a heavy gauge. My problem is the shorted load is just what I would expect, the unshorted output is one sixth of what I would expect. thanks!
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