Watt's Up User Manual

The "Watt's Up" Watt Meter and Power Analyzer User's Manual is now on the EV DownLoad Library.

Chas S.
My Bicycle Pages

Thanks V Team!

I have a Doc Wattson that is the same as the Watt's Up except that it's good to 100 Amps.
The diagram comes in handy since the wiring is the same.
Unfortunately, I haven't figured out how to use it on my bike since I occasionally have a draw of over 100 Amps.
(and, of course, the fact that it only has 14ga wires)

Wonder if I can re-build it using heavier wire and a different shunt ... :?

Dave

MB-1-E
Electric - Bridgestone MB-1 Mountain Bike

` :)
I completly forgot about the Doc Watson

Any idea where we can get a user manuel for our EV DownLoad Library ?

Peace Out,
Gman

Now that we have clarified our beliefs, your invited to join us as we begin building on them to define our Community Mission Statement

http://www.rc-electronics-usa.com/ammeters/rv-battery-monitor.html

I'm not sure where my hard copy of my manual is, but will scan it if I find it.
The specs are at the site above and I believe the manual will be similar if not the same as for the Watts-up.
I didn't find the manual online, will need to look some more.

Dave

MB-1-E
Electric - Bridgestone MB-1 Mountain Bike

The Three Wire Connection is shown here that may work better in some situations ...

Electric Bike Connections for the "Watt's Up" Meter

Example electric bike connections are shown in the diagrams below.
Four Wire Connection (easy to understand)

The "jumper cable" hookup. While easy to use, this approach forces the use of heavy gage wire for the plus lead and increases power dissipation in the meter. It also slightly decreases voltage accuracy at higher currents due to additional voltage drop across the plus lead. The drop is ~0.01 V per 12 A compared to the voltage at the meters source lead tips.
Three Wire Connection (better performance, less wire)

The three Wire hookup has several benefits. This arrangement requires only two heavy gage wires to carry the negative lead current and so is better for remote testing and monitoring. The third, plus, wire can be lighter gage (e.g. 20 gage or heavier) as it only carries the small current required to run the meter itself.

The three wire hookup also allows higher current operation as the heat from power dissipated by high current in the plus wire is no longer present.

Our Meter Links page has a handy wire resistance and voltage drop calculator.

Many other meter uses and arrangements are possible.

Please see the meter's User's Manual for more details and safety precautions.

Diagrams show energy flowing from left to right

Dave

MB-1-E
Electric - Bridgestone MB-1 Mountain Bike

A larger version of the above diagram is now on the EV DownLoad Library.

Chas S.
My Bicycle Pages