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  1. U

    Battery voltage drop overnight

    Hi! I recently had a problem with my 72v 21ah triangle pack when a charging wire had fallen off one of the cell groups. After soldering it back on, it seems degraded. All the other groups can hold their voltage (or drops ~0.01V after charging), while the said cell group drops by a whopping 0.1V...
  2. U

    BMS/battery trouble

    My 72V China battery says it's fully charged but stops working after a few minutes usage. I opened the pack and started measuring the small wires from the BMS connector to the battery. Here are the results: connector 1-2: 0V connector 2-3: 0V connector 1-3: 7.2V connector 3-4: 4.2V connector...
  3. U

    Tiny hub motor sucking the life out of my batteries.

    So I have a 500W 48V brushless hub motor I bought from aliexpress. It's been working OKish for a couple of winters now, but it has always been a bit noisy and the range has been much shorter than that of my summer bike. At first I thought it was because of a weak battery, but after switching to...
  4. U

    Upgrading advice, 1000W 48V China kit

    Hi there, ebike experts! I've built a couple of ebikes now using cheap China-kits, one 1000W rear hub and one 500W front hub for winter usage. What I want to ask about is my primary build: - 1000W rear hub motor, 48v brushless. - 1500W controller with 3-speed switch - 48v 20Ah li-ion battery...
  5. U

    New alibaba battery and new controller, more speed?

    Hi there! Bought a new triangle li-ion battery from aliexpress the other day: http://www.aliexpress.com/item/Great-Triangle-electric-bike-battery-48v-20ah-Samsung-cell-lithium-ion-for-1000w-1500w-2000w-motor/32401868802.html Got it for 384 USD including shipping which is pretty cheap...
  6. U

    Do I need a puller for replacing hall sensors?

    Hi! Bought a brushless motor in April this year: http://www.ebay.com/itm/2015-New-Style-Black-48V-1000W-Brushless-Gearless-Hub-Motor-for-Rear-Wheel-Ebike-/171560558140?ssPageName=ADME:X:RTQ:US:1123 Recently it started acting up, and suddenly it stopped working at all. Measured the hall...
  7. U

    Limiting max throttle with resistor

    Hi, Just bought a battery from a Chinese eBay seller, a Panasonic 18650 12Ah battery. In the description they said it shouldn't be used with more than 1000W motors. Here's the link to the battery...
  8. U

    Hot phase wires and only half speed

    Hi experts! Just replaced my fried China hub motor (brushless 1000w) with a new similar one. The motor ran backwards when using the matching colors so I made the switch suggested by the troubleshooting guide here (yellow and green on hall wires and yellow and blue on phase wires) and got smooth...
  9. U

    Help with checking controller

    Hi, I'm a newb here, and I just fried my cheap Chinese brushless motor and bought a new one. The colours did not match and I'm at best getting "rough movement" meaning I have to help the wheel to get the motor to start. Before I proceed testing all the 36 wiring combinations, is there any way...
  10. U

    Something is moving in the hub but the wheel aint.

    Hi, I'm a newbie from Norway. Bought this cheap eBay kit from sun-thing28 - 1000W rear wheel with a 48V 20ah LiFeP04 battery that I've been riding around with in a backpack (this thing is not legal in my country). Using the bike for commuting, only roads. Things were good until last week when...
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