Comparisons on some brushless controllers!!!

[lutach]

Originally Posted by cemetery gates

Are you using the eagletree? I too have not been able to go beyond 124 amps with the eagle tree, IIRC it is only rated for 100 amps. I don't think that lutach is using an eagletree but some other power analyzer....


Bye

I'm using a BNB Products DPR-II-150. It is rated for 150, but it's reading beyond that all the time. Blaine from BNB also said, "The best way to measure high current is to add a calibrated shunt across the DPR's current sensor." Which I have no idea what it means.

[BrianG]

Originally Posted by lutach

I'm using a BNP Products DPR-II-150. It is rated for 150, but it's reading beyond that all the time. Blaine from BNP also said, "The best way to measure high current is to add a calibrated shunt across the DPR's current sensor." Which I have no idea what it means.

What exactly is a DPR-II-150? Any links?

A shunt is simply a very low and very precise resistor placed in series between the source and the load. Usually looks like a thick wire. When current flows through it, a small voltage drop is generated, which can be measured with a simple voltmeter. The trouble is selecting the right size shunt value so that you can get a good reading, yet small enough not to suck up too much of your voltage. And then there is the power dissipation factor. I wouldn't want to drop more than 0.1v at 200A. Even at 0.1v and 200A, the shunt would have to be rated for at least 20w.

BTW: Eagletree does make an add-on sensor that measures up to 300A, but isn't explicitly said to be compatible with the micro e-logger. IIRC, it is for the other recorder unit.

[lutach]

Originally Posted by BrianG

What exactly is a DPR-II-150? Any links?

A shunt is simply a very low and very precise resistor placed in series between the source and the load. Usually looks like a thick wire. When current flows through it, a small voltage drop is generated, which can be measured with a simple voltmeter. The trouble is selecting the right size shunt value so that you can get a good reading, yet small enough not to suck up too much of your voltage. And then there is the power dissipation factor. I wouldn't want to drop more than 0.1v at 200A. Even at 0.1v and 200A, the shunt would have to be rated for at least 20w.

BTW: Eagletree does make an add-on sensor that measures up to 300A, but isn't explicitly said to be compatible with the micro e-logger. IIRC, it is for the other recorder unit.

Brian,

It is BNB Products, I typed BNP. Here is the link: http://www.bnbproducts.com/

I have to admit, I was a little scared trying my Schulze 18.97KWF. Good thing it only thermaled. I reset it and it is working fine.