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    Free - 2005 E-Max Lithium Converted Scooter - SOLD

    Street legal and titled in Pennsylvania. Has a 40AH 48 volt Thundersky/Winston cell main pack and a 40ah 12V "booster" pack. Original style Fecher-Goodrum BMS. With a healthy pack, range was at least 35-40 miles and in 60V "boost" mode, top speed was 45mph. The 14 year old pack is degraded...
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    We regret to inform you that scooters aren’t actually good for the environment

    Different kind of so-called "scooter"! This forum discusses real scooters of the electric-powered variety.
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    QSMOTOR,0.5-12kW Electric Hub Motor & Mid Drive Motor Manufacture China

    Yes; the owner and the place where ZEV's are assembled are near where I live. Maybe the quality has improved but when I test rode a couple of their models in 2011 I was not too impressed. Even if the quality has improved, they still don't have two features that are essential for any kind of...
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    QSMOTOR,0.5-12kW Electric Hub Motor & Mid Drive Motor Manufacture China

    bigbore and parabelluim, The crack is too thin to photograph I would have probably needed dye penetrant testing if I didn't know right were to look. but no doubt widens under the air pressure load. Obviously, a crack in a car or motorcycle wheel is potentially dangerous structural defect, the...
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    QSMOTOR,0.5-12kW Electric Hub Motor & Mid Drive Motor Manufacture China

    abbreviation for "If I recall correctly"
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    QSMOTOR,0.5-12kW Electric Hub Motor & Mid Drive Motor Manufacture China

    My motor is essentially the same as the one below except for being a V2 with the greater number of poles. This would be the one I would have to get if I have to replace the whole thing as the V3 is not much more expensive. $681 with shipping...
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    QSMOTOR,0.5-12kW Electric Hub Motor & Mid Drive Motor Manufacture China

    markz, The wheel is integral with the motor - so a welding repair is likely to damage the expensive motor. My point was that the the wheel rim needs to be detachable from the motor for repair or replacement - like any other kind of vehicle. The hub motor/wheel assembly cannot be attached to...
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    QSMOTOR,0.5-12kW Electric Hub Motor & Mid Drive Motor Manufacture China

    A few questions for QS Motor... I have a scooter with an older model 13-inch QS motor used in a Current Motor Company maxi-type scooter which was assembled at their facility in Ann Arbor, Michigan, USA. Current Motor is now out of business and I am unable to contact their former...
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    HP 3kW PSU - charging solution

    Er... in the USA "hire" refers to employing someone and is used in no other way. The correct word you needed to use is "rent" a boat. Don't expect a USAn to know all the strange words you Brits use. Also, try to speak more clearly. Especially, learn to properly pronounce "Glass of water" or...
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    "Zephyr" - Finally, the "v4" Fechter/Goodrum/Hecker BMS...

    I received my V 4.4.3 boards, Instruction and BOM, and have ordered the parts. FYI,with no MTA connectors, and the slightly cheaper plain aluminum Hammond box, the bill was $94.11. I have couple questions and comments: 1. As someone else commented way back, resistor R14 is still listed on the...
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    "Zephyr" - Finally, the "v4" Fechter/Goodrum/Hecker BMS...

    Gary or Richard, After receiving the board, I just noticed that the instructions say the CV voltage of the charger must be adjustable. However, this isn't the case on the chargers I have, which are currently being used with my old 16-cell V1.5 boards. These charger's CV voltage is...
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    Charging my new thundersky pack

    What type of BMS will you be using? The Zephyr BMS (do a search on this forum) is fairly unique in that it will work with ordinary Pb-acid chargers. Most others need a purpose-built charger that can be switched to a low rate of charge once the balancing starts. Also, for the 20-cell pack you...
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    Even Newer 4 to 24-cell Battery Management System (BMS)

    That is another way of viewing it, although if they were balanced to start off, they should be discharged the same amount and should reach "full" at the same time as well. The few cells that I actually had to replace behaved as Richard described - as if they were self-discharging and so got...
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    Even Newer 4 to 24-cell Battery Management System (BMS)

    Fechter wrote: In the case of my Thundersky cells, it is the less-healthy cells that come up to the shunt voltage sooner while the healthy new new cells lag behind. I learned this when I had to replace a couple bad cells in the pack with new ones. The cause of this is simply that the mode...
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    Even Newer 4 to 24-cell Battery Management System (BMS)

    Well, the old, unsophisticated V1.5 boards continue to work well for me (or is there something I need to know?). Even when charging at 16A by doubling-up the chargers the masonite cover over the board only gets a bit warm over the charger control FET. They may not be capable of shutting...
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    Even Newer 4 to 24-cell Battery Management System (BMS)

    Gary and Richard, I'm returning her from a long absence. I fortuitously blundered into your conversation with Dick since I may want to do the same expansion of my old v 1.5 boards as part of a 60V upgrade to the scooters - which continue to work just fine by the way. So, are any of the...
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    Even Newer 4 to 24-cell Battery Management System (BMS)

    Gary or Richard, Couple questions and comments: 1. Are new v 2.5/2.6 BMS boards available? I notice Gary's site says "out of stock". 2. My old V1.5 boards continue to work well on both the the scooters (16 cell 40AH, 8A charger) except for having to remember to unplug the charger at some...
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    Even Newer 4 to 24-cell Battery Management System (BMS)

    At risk of drifting off-topic, I found little self-balancing effect with my Thundersky pack even when charging at just C/5 (8 amp). I'm not sure how far apart the voltages would get, because I'd always interrupt charging while watching the voltages like a souffle in the oven. But at the 59.5...
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    Help-Ping Charger Failure - fixed

    Just noticed how old a thread this is... Here's the data sheet for them... http://www.gesensing.com/downloads/datasheets/920_325a.pdf
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    Help-Ping Charger Failure - fixed

    I can't see the part in your picture, but the the NTC 10D 20 is a NTC Thermistor inrush suppressor - used commonly in most switchmode power supplies. It should be a dark disc shaped object that looks like a ceramic capacitor. Their function is to limit the inrush current into the big input...
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    Even Newer 4 to 24-cell Battery Management System (BMS)

    In my case with an older board, once all the LED's are flashing, the charging current continues to decline, and the master LED only gradually changes from red to orange to yellow to greenish yellow. I am assuming that although all the shunts are on, they are still on a low-percent duty cycle...
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    Even Newer 4 to 24-cell Battery Management System (BMS)

    I never understood the purpose of the connections on the board for the charger positive and pack positive leads. Only the negative lead needs to go through the board and then to the negative pack terminal. The charging positive lead can simply be run directly to the positive terminal of the...
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    Even Newer 4 to 24-cell Battery Management System (BMS)

    Richard, I now have about charge 35 cycles using the BMS on the two scooters with the 48 volt 40AH Thundersky cells. At end of charging with 8-amp chargers, the shunt indicator LEDs are generally all flickering with uniform brightness within about 15 minutes of the first LED going on. The...
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    Even Newer 4 to 24-cell Battery Management System (BMS)

    I have been running an earlier version of this BMS for a few months now, and the actual shunt activation voltage for the 75/180 resistor pair is about 3.67 to 3.70 volts. So, your 3.89 volt value will probably be correspondingly higher as well. At risk of wandering a bit off-topic, the...
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    Even Newer 4 to 24-cell Battery Management System (BMS)

    This would be difficult. Also, I was curious about Richards explanation of the shunt voltage temperature dependence.
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