RC-Monster Forums - View Single Post - Home-brew battery measuring station

BrianG · 10:04 PM

A little update:

Well, due to finances, it's gonna be a while before I get this whole project done (MMM and various odds & ends). But, I decided to do a little playing around with what I do have.

I made a little resistor network consisting of four 3 ohm resistors mounted on a small heatsink, which I can configure in all sorts of ways to get resistances from 0.75 ohms to 12 ohms. This was intended for future BEC tests and other small projects (power supply testing, etc).

I also have an extra XL5 brushed ESC, which worked perfectly for the current levels I wanted to play with. So, I hooked up the servo tester, eagletree, and resistor network (configured for a 0.75 ohm load) to a Maxamps 2s2p 8Ah pack.

So, with everything hooked up, I set the servo tester for automatic sweep. I can very the speed of the sweep, as you will see in the graph. Anyway, this is just an idea of what this project will be able to provide:

As you can see, I started with a medium speed sweep, then went to slowest, then fastest, then a little playing around in manual mode. Of course, the real test won't look like this; I just thought you'd like to see the various modes available...

Here is a link to the raw eagletree file if you feel like loading it in your software to take a better look: Log File

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BrianG RC-Monster Admin Offline Posts: 14,609 Join Date: Nov 2005 Location: Des Moines, IA	08.04.2009, 09:57 PM A little update: Well, due to finances, it's gonna be a while before I get this whole project done (MMM and various odds & ends). But, I decided to do a little playing around with what I do have. I made a little resistor network consisting of four 3 ohm resistors mounted on a small heatsink, which I can configure in all sorts of ways to get resistances from 0.75 ohms to 12 ohms. This was intended for future BEC tests and other small projects (power supply testing, etc). I also have an extra XL5 brushed ESC, which worked perfectly for the current levels I wanted to play with. So, I hooked up the servo tester, eagletree, and resistor network (configured for a 0.75 ohm load) to a Maxamps 2s2p 8Ah pack. So, with everything hooked up, I set the servo tester for automatic sweep. I can very the speed of the sweep, as you will see in the graph. Anyway, this is just an idea of what this project will be able to provide: As you can see, I started with a medium speed sweep, then went to slowest, then fastest, then a little playing around in manual mode. Of course, the real test won't look like this; I just thought you'd like to see the various modes available... Here is a link to the raw eagletree file if you feel like loading it in your software to take a better look: Log File Last edited by BrianG; 08.04.2009 at 10:04 PM.