I am wanting to monitor power usage on my longer trips as I know I may have an issue going back on a depleted battery. I drive an electric car and have an instantaneous measure of my power consumption. I would like the same on the bike. I know I have 5 bars as an indicator but to choose an optimal gear/power assist combo would be great. If my hearing was more acute, the drive noise from the 750w motor would tell me I guess. To use the Hall effect it is only needed to run a power cable thru the yoke and supply a low voltage battery to the gauge. My PIM has two heavy quick disconnect cables to the motor with easy access. No idea which is going to the motor and which is coming from the motor/regeneration. Since power is unlikely to be flowing both ways at once, can I just run both thru the yolk? Any other ideas? This is a small investment in the $20 range. Thanks
Hall Effect Current Reading
- Thread starter slowguy
- Start date
harryS
Well-Known Member
The Hall effect sensors in a motor are used to signal position of the rotor. If you monitor the current thru a single sensor, it won't tell you anything.
What you might do is buy a wattmeter. It goes between the battery and controller. Some can read the instantaneous current, calculate the watts, watt-hr, and amp-hrs being used, and log the min/max currents. If you set it up with a remote shunt, you can place it on the handlebars, but that is complicated, and most users already have a watt display on their displays. I use mine to look at how many AH were used on a ride, or how many AH were used to charge an empty battery. Sometimes it's nice to see the peak amps out of a new battery. After a while, a wattmeter loses its novelty as you come to understand how your battery/bike/motor use power.
The first one is about 10-12 bucks in ebay, but you can pay a little more and get it faster on Amazon. The other two, I've never used.
https://www.amazon.com/Power-Analyz...s=gateway&sprefix=RC+Wattmeter,aps,161&sr=8-4
https://www.amazon.com/Lastnight-Ai...s=gateway&sprefix=RC+Wattmeter,aps,161&sr=8-7
https://www.amazon.com/DROK-Digital...s=wattmeter&qid=1555103243&s=hi&sr=1-55-spell
What you might do is buy a wattmeter. It goes between the battery and controller. Some can read the instantaneous current, calculate the watts, watt-hr, and amp-hrs being used, and log the min/max currents. If you set it up with a remote shunt, you can place it on the handlebars, but that is complicated, and most users already have a watt display on their displays. I use mine to look at how many AH were used on a ride, or how many AH were used to charge an empty battery. Sometimes it's nice to see the peak amps out of a new battery. After a while, a wattmeter loses its novelty as you come to understand how your battery/bike/motor use power.
The first one is about 10-12 bucks in ebay, but you can pay a little more and get it faster on Amazon. The other two, I've never used.
https://www.amazon.com/Power-Analyz...s=gateway&sprefix=RC+Wattmeter,aps,161&sr=8-4
https://www.amazon.com/Lastnight-Ai...s=gateway&sprefix=RC+Wattmeter,aps,161&sr=8-7
https://www.amazon.com/DROK-Digital...s=wattmeter&qid=1555103243&s=hi&sr=1-55-spell
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