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  1. Samson

    Volts\Amp\AmpHr etc. Alarm Limit Meter

    This unit may have been mentioned in another thread. http://www.ebay.com/itm/Dc-10-90v-0-100a-dual-Digital-led-voltmeter-ammeter-voltage-amp-power-meter-12v-/181004140379?ssPageName=ADME:L:OC:US:3160 I wanted to use the Alarm functions of this device to protect my batteries from a "run away"...
  2. Samson

    Which Halls for 9C?

    I have a 9C with one bad Hall cell. I removed it and replaced it with a S41 037 cell. When I test the cells with a small magnet I find that the two original cells toggle at about 1\8" distance from the magnet, and when the magnet is removed they reset. The replacement part picks up at about .5...
  3. Samson

    Effect of Charger wire length and an optimum charge strategy

    Over the last several weeks I have built my first Ebike. It is a low power set up using a 250 Watt geared Hub motor and 14S 10 Ahr Headways with a Cell man BMS. I keep the bike in the garage but I have the charger inside the house so I can monitor the charging cycle easily. To do this I ran a 2...
  4. Samson

    Ugly Motor waveforms

    I built my first E-bike last week and it seems to run okay but I just poked an oscilloscope probe on the motor phases and Hall outputs and things do not look well. The image is of a scope trace with the one Hall output on top and one phase on the bottom trace. There are spikes of significant...
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