Best On-Board Battery Monitor/ Current Meter?

Hi guys,

Went for a test run on my 80100 80Kv build this am and had a virtually immediate failure of my battery monitor. I was running the motor up in the water with the board against the dock. As I was easing into the throttle I saw around 5000W on the meter and the a spark from behind the screen and the unit (and everything downstream) shutdown. It was supposed to be rated for 200A and I estimate I was at about 60% of that when it failed and it was only there for a couple seconds. I was using this meter successfully with my smaller power glider motor but despite its 200A rating, it didnt stand a chance with the larger 80100. I have a 150A breaker just before this meter and it didnt trip for what its worth (not that it should have) and I am running 2X 20000mah turnigy 6S in series (12S).

Previously I used the 150A version of this meter with the powerglider motor and blew it so i upgraded to this 200A unit which had much larger wires. Now its toast.

What meters are you guys running with success? It would be great to have something that logs as well. The meters I have been using just show you real time voltage and current. This would be placed behind a window on my electronics enclosure so I can keep track of battery voltage while riding. Maybe something that measures current via hall effect instead of all that power running through the meter? I am running a Flier 400 boat esc.

For future builds stay away from the HTRC / Cheap Amazon meters! It took me buying two of these to learn this lesson.

Thanks for the help!

I solved that by switching to the VESC, you get all the data you need, battery current, motor current, temperatures,… add a BT module and you can nicely log and monitor everything on your phone.

Else maybe try a current monitor with a hall sensor clip.

This is a good cheap option, I used it with my first extremely inneficient efoil that cruised at around 2800w, this power meter survived that, while being inside the box with the batteries and scorching ESC’S. I did upgrade the wires to 8AWG. It also logs max power, max current, time on, wh used, ah used and a few other things.

1 Like

Found the problem with the failed meter… I took it apart and the shunt resistor fell right out. I guess the solder got so hot that it melted and came undone. I can resolder it but I wonder if it will just come unsoldered again?

Thanks for the feedback guys. I wish I had a VESC but just recently got this Flier 400 and would like to stick with it since I have it. I like the idea of a hall effect type sensor only because i won’t ever have to worry about it burning up again like the shunt style. We pushing alot of power through these components so i feel like using something that all that power doesnt need to pass through is the safest bet.

i’m using eLogger V4 with GPS , RPM and temp sensors… a bit expensive solution, but the data is good. it worked well for me, but others had less happy experience…

Thanks Matt.

I had one of those but after only getting to use it like twice i accidentally wired it incorrectly and tried to send all the current through the esc lead and smoked it. Im still pissed about it. I havent thought about trying to repair it but now that we are talking about it, i wonder if it could be fixed by replacing the burnt component?

As far as the real time display in am looking for i ended up ordering one of these last night:

It uses a hall effect sensor so hopefully I wont have any overheating issues like I had with my last two shunt style meters. That fact that those were getting so hot also makes me think they were sucking a considerable amount of power from my batteries so hopefully this one will be more efficient.

I also went ahead and ordered two of these temp monitors so i can keep tabs on my battery temps and closed loop cooling water temp.

1 Like

i received this week:,searchweb201602_7,searchweb201603_55

So far so good.