Eagle Tree Data Logger

[Seadweller]

I have a few silly questions that I would like to hear a couple opinions. I recently purchased the Eagle Tree Data Logger V3 (150 amp version). I decided if I was going to stick with this addictive hobby, there are some basic, essential equipment that would be needed (based on all the great information on this forum) to make setting up a boat much easier, more precise and hopefully less costly in the long run.

I gone over the instructions and understand the basics (connecting between the bats and ESC). However, I was wondering if it would be appropriate to hook the logger between the ESC and motor? Does connecting the logger between the ESC and batteries provide the same info on amp draw as one would see from the motor to the ESC? It seems to me that connecting between the Bats and ESC might possibly show a higher amp draw than if connected between the motor and ESC. It also seems that both connections would provide valuable but somewhat different information.

I'm getting ready to start testing a 31 Challenger (Etti 150 ESC; 12XL, 4S (either 2x2S2P 5000 in series or 2x4S2P in Para, guess I can go to 6S using 3 x 2S2P in series). Suggestion on a starting prop? I was thinking of a CF 42, aX440 or X637.

Thanks!

[sailr]

I would say follow the directions or call Eagle Tree before trying to second guess the people that designed it.

[G Doggett]

The Data Logger is connected between the ESC and batteries because you want to know the total current draw from the batteries.
It is technically impossible to have a higher current draw between the ESC and motor compared to ESC and batteries as all energy is being drawn from your batteries. You have no other source of energy.
In fact you could get a lower than true total ampage reading if you connected your Data Logger between the ESC and motor because some energy could be being dissipated as heat from resistance in your connections and ESC before it got to the Data Logger.
Besides with a brushless set up how are you going to connect to the 3 wires ?
Graham.

[Seadweller]

Thanks Gents for the information.

Graham - good and simple point about the 3 wires, as I slap my hand to my head. And you explanation makes sense, sort of what I was thinking but overall, I'm looking for the highest amp draw in order to tune and protect the system.

Thanks you both for the response!

[Seadweller]

One more question, it appears the data logger is not waterproofed. Does anyone waterproof the loggers or would a good dip in corrossion X be ok?

Thanks

[tharmer]

I used 3M DP 270 (?) conformal epoxy (Offshore El has it) on mine. Also on the panel. Not on the GPS unit.
-t

[mickvk]

One more question, it appears the data logger is not waterproofed. Does anyone waterproof the loggers or would a good dip in corrossion X be ok?

Thanks

Corrosion-x is good, but since you don't need to dissipate heat, conformal epoxy is better.

[mickvk]

It would be interesting to compare consumption in vs. power out of the ESC to measure efficiency. I think I may have burned up an ESC running it at half throttle - where efficiency is really low. But as stated, on a brushless system, you can't connect it directly.