Search results

Date Relevance Most replies

  1. E

    New Bafang Crank-Drives

    Could it be the low voltage warning? It is kind of a nasty sound. High power can drop the voltage as much as 4.0 from the resting V. So if you are below 45 V resting, the voltage cutoff is a possibility.
  2. E

    BBS02 number of PAS levels effect

    I've found that 5 levels vs 9 has equaled more AH usage for my rides by a factor of about 1.25. So I've been looking for an explanation about how choosing fewer levels translates into practical usage. I found the following article that explained this at Electric-FatBike.com...
  3. E

    Weight Weenie Ebike

    I do lots of unassisted riding with the Bafang BBS02 kit, but I've only had it for 2 months. I got the kit for all the steep grades where I live, including a 4 mile 2000 foot climb to my house from anywhere. For the most part, I ride the flat unassisted. Although I agree that any drag is not...
  4. E

    guide on using watt meter to estimate range

    I agree with the principle. But the measurement taken with the flawed tool must be consistent to be useful. The G.T. Power meter I have is consistent reporting volts and AH, but it calculates wh by some whim I am not able to understand. Example: first trip: 3.26 ah, 104 watt hours from full...
  5. E

    guide on using watt meter to estimate range

    Watt hours reported was grossly inaccurate and inconsistent. Deriving the WH from AH yields a V of close to 80 for my 48v system for full cycle. Also 3.25 AH = 104 WH for 1 trip, and 240 for another. This is the same issue reported earlier on the thread.
  6. E

    how low can you go? safe minimum voltage

    Good to know. But looking at the discharge curves etrike posted (thanks), not much is left below 3.1V.
  7. E

    how low can you go? safe minimum voltage

    No, been counting on the BMS. Individual cell values I have reported have been mathematically derived. No drop in power on the lower end. But higher discharges will increase the difference between resting and under-load voltage, bringing the LVC into play. I think the voltage drop is similar...
  8. E

    how low can you go? safe minimum voltage

    This was a one time test of range. Typical discharge will be to 3.2v or higher. Only went as low as I did because I was expecting a full shutoff. I guess that would happen when V stays below the LVC point, which didn't happen. There was never an error on the 961 display like 06 or 22 indicating...
  9. E

    guide on using watt meter to estimate range

    Today US ebay seller emilyandlily refunded full price after 6 weeks for watt-hour issue without contest. Listing advertises 2 month warranty. So if you want to try one these, the risk is low...
  10. E

    how low can you go? safe minimum voltage

    The readings are from 3 different rides and routes, from full charge to nearing LVC over the total of the three. But the motor was used almost exclusively for climbing, though grades varied. I've found that the grade changes power usage almost imperceptibly per unit of elv gain. 1000 feet...
  11. E

    guide on using watt meter to estimate range

    Well no need to bother with a meter of any kind if you're not going to learn the empty value. But there is a difference between using ah and wh. Sure they are both measures of capacity use, wh being ah * voltage. They both display equivalent empty values. But wh compensates for voltage drops...
  12. E

    how low can you go? safe minimum voltage

    I ran my battery down to 3.0 V/cell under load yesterday. I didn't realize I could do this without either the BMS or the bbs02 controller shutting down. Or perhaps my understanding of what constitutes a shutoff is wrong. At the end the resting voltage was 42v. Which / 13s = 3.23 V. But watching...
  13. E

    guide on using watt meter to estimate range

    Wh per mile will vary. But wh used is just what it is. Knowing your wh use enables you to estimate what's left and at what rate you're using up your battery. Whatever the variable, it makes a good fuel guage.
  14. E

    guide on using watt meter to estimate range

    Nothing like a watt meter to track that "wh used per mile." Sure there's typical wh usage, but there's atypical as well. Those pesky variables of wind, route, elevation gain, pedaling effort, etc. Simple miles traveled can't match a meter.
  15. E

    guide on using watt meter to estimate range

    The beauty of watt-hours from the range perspective is that it adjusts to the declining voltage. 1Ah with a fully charged battery yields more watt-hours or measure of work than 1ah with a battery nearing its min voltage. So the watt-hours calculation is always changing based on changing voltage...
  16. E

    BBS02 number of PAS levels effect

    Alfantastic, great recommendation! I tried 5 PAS levels on a long ride over challenging terrain yesterday. 46 miles, 3317 feet elevation gain. I really liked it. Big improvement over either 9 or 6 levels that I had previously tried. Below is how the levels performed from a climbing perspective...
  17. E

    BBS02 number of PAS levels effect

    alfantastic, I just set levels to 5 for a test. I don't think I can ride until Saturday though. Will post afterwards. Thanks, Esteban
  18. E

    BBS02 number of PAS levels effect

    No, but someone might actually know how this works and be inclined to share that information. I've already spent a lot of time searching before posting the question, and also some time experimenting, but the effect of changing the number of levels is not clear to me from either pursuit. Thanks...
  19. E

    BBS02 number of PAS levels effect

    LOL. The haystack thread. Not much activity there these days, so I hesitate to ask questions there. I'll try to find the needle in the haystack for the full explanation.
  20. E

    BBS02 number of PAS levels effect

    I'm wondering what the effect of choosing fewer than 9 PAS levels is? If one chooses say 5, does that translate into the same full power in PAS 5 as the maximum level of 9 would, with a bigger jump from level to level? Would that make level 1 of 6 somewhat equal to level 2 of 9? I'm finding in...
  21. E

    how low can you go? safe minimum voltage

    OK, I'll run it to cutoff and find out and see where that falls. I have a watt meter installed so the value should be be pretty accurate. 3v x 13 =39, so I should be safe at a cutoff value of 40 or 41, whatever the bbs02 controller setting actually is. I guess I won't know who is doing the...
  22. E

    how low can you go? safe minimum voltage

    I'm wondering how low the voltage can go without damaging the motor, controller or battery? Can I run it until the controller shuts off? Is there a built in safety cutoff? Would the bms on the battery shut down discharge at some low value as well? My primary interest is to learn what the actual...
  23. E

    how to bundle power wires from battery to controller

    Actually I have a fairly long run considering I'm planning to install a watt meter on the handlebars. Snaking the wire to the meter up the stem and around to the bars while avoiding unsupported spans of phase wire may call for the flexible 12ga silicone I ordered. But I really like the...
  24. E

    how to bundle power wires from battery to controller

    This is what I expected to find at Hobby King (I know it's at hardware stores), and not finding it is what prompted some research, and eventually this thread. Heat shrinking the connector ends over the cable jacket would make a nice clean and easy install. So why all the fuss making up cables...
  25. E

    how to bundle power wires from battery to controller

    I got this in 6mm: Expandable Braided Sleeving Cable Wire Harnessing Sheathing Sleeve. http://www.ebay.com/itm/331154782446?_trksid=p2057872.m2749.l2649&var=540358017347&ssPageName=STRK%3AMEBIDX%3AIT I think it is the same as the split loom, only not split. So I'll have to install while making...
Back
Top