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An Amp Volt Meter is a small, dual read out, digital meter
...that will show the voltage of your battery pack (top reading, in red)
...& it will also show the amperage (Amps) that your motor is drawing from the battery pack (bottom reading, in blue)
This is the one I have/used
https://www.ebay.com/itm/291152585319
...it was only ~$15.00 delivered
...it's 48 x 29 x 21 mm (~2" x ~1 1/8" x ~7/8")
It comes with a (500A/75mV) "Shunt" (basically a giant resistor) that sends information to the meter
...that you install on or near the negative terminal of the battery pack
IMHO It's simple to install & very easy to hook up
It only has (5) wires to connect
The small plug has (2) wires
(they supply the power to the meter)
...the positive (+) red
...& negative (-) black
The bigger plug has (3) wires
(they are the meters sensor "or data" wires)
...the B+ (red) sensor wire goes to the battery packs positive (+) terminal
...the B- (black) sensor wire goes to the (B-) on the shunt
...the P- (yellow) sensor wire goes to the (P-) on the shunt
* The meter can monitor up to 300VDC (the red (3-plug) sensor wire)
...but it can only be powered by ~5V thru 30VDC (the red (2-plug) power wire)
To begin with,I drew a simple wiring diagram
...to show how I connected the meter to a small 24V 12AH battery pack
I added a switch to be able to turn the meter off when not in use (I also show many of the other components involved on a small EV)
...to help illustrate & show how everything is connected & interconnected
** Since this battery pack is under 30V
...the meter can be powered (directly) by the monitored pack voltage
...but, remember this diagram is ONLY for a 24V system
https://www.youtube.com/watch?v=WMmLiqFFuUg
...that will show the voltage of your battery pack (top reading, in red)
...& it will also show the amperage (Amps) that your motor is drawing from the battery pack (bottom reading, in blue)
This is the one I have/used
https://www.ebay.com/itm/291152585319
...it was only ~$15.00 delivered
...it's 48 x 29 x 21 mm (~2" x ~1 1/8" x ~7/8")
It comes with a (500A/75mV) "Shunt" (basically a giant resistor) that sends information to the meter
...that you install on or near the negative terminal of the battery pack
IMHO It's simple to install & very easy to hook up
It only has (5) wires to connect
The small plug has (2) wires
(they supply the power to the meter)
...the positive (+) red
...& negative (-) black
The bigger plug has (3) wires
(they are the meters sensor "or data" wires)
...the B+ (red) sensor wire goes to the battery packs positive (+) terminal
...the B- (black) sensor wire goes to the (B-) on the shunt
...the P- (yellow) sensor wire goes to the (P-) on the shunt
* The meter can monitor up to 300VDC (the red (3-plug) sensor wire)
...but it can only be powered by ~5V thru 30VDC (the red (2-plug) power wire)
To begin with,I drew a simple wiring diagram
...to show how I connected the meter to a small 24V 12AH battery pack
I added a switch to be able to turn the meter off when not in use (I also show many of the other components involved on a small EV)
...to help illustrate & show how everything is connected & interconnected
** Since this battery pack is under 30V
...the meter can be powered (directly) by the monitored pack voltage
...but, remember this diagram is ONLY for a 24V system
https://www.youtube.com/watch?v=WMmLiqFFuUg
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