Search results

Date Relevance Most replies

  1. jondoh

    eCar kW usage at cruising speed! ... ???

    my experience has been that cruising amps are about 100 to 200 amps. i woulnd mind a small 2000 watt generator for charging when parked. just a couple of hours would extend my range a lot.
  2. jondoh

    New E-Bike Builder in need of Advice

    Just to clarify, you're talking a horizontal distance of 1000 ft (a little less than a quarter mile) and NOT a vertical climb of 1000 ft with a 8% ~ 10% grade-- which is still pretty significant. I'm thinking that if you're climbing daily like that, a smaller wheel would be better as the torque...
  3. jondoh

    How to charge multiple Hobby King Zippy packs?

    if you have isolated chargers, you can connect them in series to charge your pack. This is what I do. I have 12s3p lipos (6x 6s bricks) that I charge this way. Make sure you connect all the paralleled cells (which you can do through the balance connector) so that charger sees them as one big...
  4. jondoh

    On-off switch requirements

    Are we talking battery disconnect switch? I've used these: http://www.amazon.com/US-General-Battery-Cut-Switch/dp/B001R6UIBC/ref=sr_1_12?s=automotive&ie=UTF8&qid=1291849837&sr=1-12 they're big and designed more robustly than the typically switches you get from radio shack and stuff. Some...
  5. jondoh

    EcoSpeed BB Mounting System - Any Info or Experience?

    I worked on a bike of a person that owns one. He took it 3000 miles cross country! Look up thegreenriders.org Anyway, he still uses it but says the system is complicated compared to hub motors. The ecospeed is a chain driven mid drive system. Conceptually, it's not too different from the...
  6. jondoh

    12/05/2010 24V 10AH lith Ezip $599 @Target

    Too bad you can't try before buying. The problem with specs is that manufacturers can have different ideas on how to base their specs, you're not exactly sure on how the bike will perform until you get on it. That said, i find there's a big difference between motors above and below 450 watts...
  7. jondoh

    Whats your top speed with 48 volts?

    When I had my crystalyte 408 with 20 amp controller, 36v upgraded to 48v took me from 18 mph to about 23/24 mph. With my phoenix, 36v to 48v upgrade goes from about 24mph to 29 mph but this is with a 40 amp controller. I think the phoenix is about 1000 or 1200 watts at 48v. for 750 watt, i...
  8. jondoh

    Charger Help

    if you specify the voltage and chemistry to bmsbattery, they'll build a charger for you. Problem is that there won't be a connector. You'll have to solder the appropriate connector.
  9. jondoh

    Dean Connectors - and them disconnecting....

    Here's how to connect the pigtail to your battery wires. I use quick disconnects for a semi-permament connection from pigtail to the battery and controller. Quick disconnects are great but not meant to be connected and disconnected often as they don't have a spring contact design per se.
  10. jondoh

    Dean Connectors - and them disconnecting....

    This is why I always use these JST VL connectors. They have a positive latch and the contact pins are securely locked inside the housing. This is a superior solution to the deans. I have used these for years without problems. I can sell the mated pair for $5 if anyone is interested.
  11. jondoh

    Lipo vs LiFePO4

    I just posted a video showing connections to my Lipo set up. http://www.youtube.com/watch?v=Z010Cgv_glM Tying all the parallel balance taps plus the 6 connections to charge all the packs at once (for a balance charge) are the reasons why i'm inclined to suggest a ping pack or other ready made...
  12. jondoh

    Bottom balancing?

    I think it's important to know where Jack is coming from, i think. His experience is mainly with the large Lifepo4 batteries. I doubt he's messed with a ping pack or other smaller batteries-- at least not as much as the big batteries. Part of the problem, i think is how C rates are...
  13. jondoh

    Battery Desulfator?

    I have used this stuff on flooded lead acid batteries. It works great. It took batteries that were sitting around for over a year and made them work again. http://www.batteryde-mister.com/battery-de-sulfater.html I don't know about using them for sealed lead acids. it would requiring...
  14. jondoh

    Newbie BMS basics and tppacks BMS boards

    You know, 60v and a 60amp controller is probably going to go 40 mph in a bike-- maybe faster. Didn't you say you would be happy with 25 ~30 mph? Are you planning to go those speeds up the side of a mountain? Usually 48v is good for 25~30 mph on a bicycle on a flat. Have you considered the...
  15. jondoh

    Charging single Headway Cell, best way?

    I also agree that it would take too long to individually bring up each cell from 20%. Johnrobhomes has figured out a way to move the bms to charger. Let the pack balance and after it's done, immediately unplug. I use a power supply to "top off" cells. I let the bulk charger charge the pack...
  16. jondoh

    Lipo vs LiFePO4

    about a 9 months ago, the controller in my electric car decided to die while i was backing out of my parking spot at work. The thing to know about series wound brushed motors is that when you controller dies, it goes to a short. I had to slam the tranny into neutral to keep the car from taking...
  17. jondoh

    Lipo vs LiFePO4

    Lipos are funny in that they come in a range of quality. Sometimes you get a batch and they're well balanced and matched and sometimes they're not. While i can agree that bulk charging works for packs that are stable, balanced and matched, the issue with lipos is that if there's a problem...
  18. jondoh

    Lipo vs LiFePO4

    Pings are a good value. No doubt about that but Lipos are well worth the premium if only because they have much higher C ratings (that is, current discharge ratings). Theoretically, LiFePO4 should last longer than lipos-- however in practice, both will probably give about 2 years of service...
  19. jondoh

    Battery pack for full suspension bike

    Hey, Just wanted to show the burrito battery pack in a full suspension bike. This is the latest revision which is pretty secure. You can see me bounce the front end of the bike and the pack doesn't move much at all. A pretty good solution, I think, for those of you looking to electrify a...
  20. jondoh

    Advice Needed - Headway vs Thundersky

    It mostly comes down to size. If you have room for 60ah thundersky, this will give you the greatest range in a motorbike. If you want to go higher voltage, headway has 16ah cells. I say 16ah for a faster, lighter bike with about 20 miles range and 60 ah for a heavier cruiser that can really...
  21. jondoh

    Bottom balancing?

    Isn't that 3.2? Below 3v seems low to me. The balance is remarkable though. Well, clearly these lifepo4 cells don't need a lot of help. They do seem to have the ability to balance themselves somewhat. If you have a stable pack, don't push them past 80% dod and don't exceed thei C rating, a bms...
  22. jondoh

    1500W Elcon charger problem

    here are the pictures of the pigtail on my elcon charger. These need to be shorted to enable the charger.
  23. jondoh

    1500W Elcon charger problem

    i have this charger. You need to connect a switch to two of the pins in the mini din connector. The connection is for some kind of interlock which you don`t probably need. You need to find the mini din pig tail.
  24. jondoh

    I think i'm gonna puke.....or cry... maybe both..

    Ypedal, These are Lifepo4, right? What's the C rating and size in Ah? I think it's amazing that these cells were able to practically rise from the dead! It would be nice to worry about over discharging batteries If batteries can consistently rebound like this.
  25. jondoh

    BMS not working properly

    Ok... yes... maybe the BMS is not working. Having charged a headway pack without a balancing BMS, I got similar numbers. I still don't think there's anything wrong with this pack. Stay above 80% DOD and you won't have a problem. Lifepo4 is not lipo. Different chemistry, different animals...
Back
Top