09 Bottle Battery Controller Speed Sensor Installation

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You can make a really nice conversion using this battery that includes a 20A sinewave controller, LCD etc, or the 36v version:
https://bmsbattery.com/ebike-battery/680-48v116ah-bottle-09-panasonic-battery-pack-battery.html

It has one drawback: It needs a motor with a speed sensor in the hub to display the speed properly. Without the speed sensor, the display shows 0 mph when you freewheel downhill.

All is not lost though because it's not difficult to modify if you can drill a hole and solder three wires. You need to buy a wheel-speed sensor with the battery.

The sensor has three wires: red and black are for the 5v and 0v to power it, and the third (white) wire gives the speed signal. Normally, the speed signal comes down the motor white wire in the 9-pin harness, so the aim is to find it and join the external speed sensor wire to it and pick up a 5v supply too. Here's a picture of the controller:



I drilled a 5mm hole, cut the connector off the external speed sensor and poked the wire through on the right hand side. The white wire that we're looking for is the one that is bunched with the motor wires, not the one at the top, which is the throttle signal wire. The thin red at the top is a 5v and all the thin blacks near the bottom are 0v. We therefore want to cut that lower white wire and join the speed sensor one to it and splice the red and black wires from the speed sensor to two in the controller.

The upper red wire's solder point is accessible, so you can solder the speed sensor's red directly on top of it, but that's not possible with any of the blacks, so cut one of the blacks, strip some insulation off each end, twist the speed sensor's black onto one of them, then solder them back together again with a bit of heat-shrink over the top. The white is simple. Cut it, strip a bit of insulation off the controller side and solder the speed sensor's white to it with a bit of heat-shrink over it. A cable-tie around the wire will take any tension off the thin wires. Put a bit of sealant around the hole and reassemble. The speed display will now work properly. You might have to set parameter P2 to1 in the setup menu.

Here's a picture of it finished: