Red5Ltr

iTrader: (24)

Typo..... 1ohm

Red5Ltr

iTrader: (24)

I've been over thinking it. Basically, I size the resistor to the amperage I want to discharge at. Correct? I sell VFD's and the brake resistor needs to be in line with the base resistance of the VFD. I thought I was missing something when it came to getting a "proper" resistor for the iCharger. I appreciate everyone's patience as I work/worked through this. Last thing I wanted to do was burn up a charger.

sacmiata

iTrader: (27)

Correct - resistance is how you will get the amperage you want. The problem is you usually cant just buy one resistor that is the right resistance and also capable of handling the high wattage needed from current and voltage we are talking about.

There is more then one way to skin the cat - the 2S solution is pretty much the standard...I haven't seen a 1S discharge bank but this is how I would do it based on what's available at amazon.
(4) 1 OHM resistors that are rated for 100 watt each. Wired together that's .25 OHM of resistance. This is what you need for about 30 amps on a 2S battery.
(3) .5 OHM resistors that are rated for 100 watt each. Wired together that's .166 OHM of resistance. That should get you about 25 amps on a 1S battery. Close enough...if your going overkill and want closer to 30 do (7) 1 OHM resistors (100 watt) - resistance would be .14 in that case...that should put you really close to 30.

Red5Ltr

iTrader: (24)

I've made a 2s discharge bank as described and it works as described. I have a question about the discharge rate. I know the bank that I built for 30 amp discharge rate, 5 - 1ohm, 100watt resistor wired in parallel. If I want to discharge at 25amp instead of 30amp, the charger will try to discharge to 25amps, then drop to like 6.1 amps, and then give me an error message "output connection break" At 30amp's, it seems to discharge just fine until it get close to the desired discharge voltage of 3.5v per cell and I get the same error message, "output connection break. Can anyone assist? I know the easy answer is to just discharge at 30amp. I should mention that I made this discharge bank to be used with my iCharger S6.

Silverbullet555

iTrader: (16)

Your resistance is actually not correct. .2ohms which is what you have is for a 406 duo. You need about .25 ohms. I built a specific resistor bank for the x6. 4 1 ohm resistors in parallel then goes series to 2 - 1ohm resistors in series I think. I'd have to go look at it again. I forget what it worked out to, but it works.

Red5Ltr

iTrader: (24)

Is .25 ohms of resistance what the X6 requires? I have an S6, is this charger different? Also, how do we know what the required internal resistance is for the iCharger family? Has this been found by trial and error because I've never been able to find a document showing this info.

One more thing.... Im looking to build a discharge bank for a 1s lipo for my 1/12 scale cars. Everything I've read it looks like I need roughly .107 ohms, so like 4 - .50ohm / 100watt resistors? I'm also assuming to get the balance lead to work I just run the balance leads to the + & - on the battery plugs and then goto to the balance port?

sacmiata

iTrader: (27)

S6 is rated for 40 amps. So you should be fine with what you built.

I don’t think you can throttle the resistive load bank. It’s more of a run wide open until the voltage has dropped far enough then it turns off.

I would set up the charger to discharge at 40 amps and see if it completes the cycle. It might not get to the full 40 but it should complete the cycle.

if you want to just limit the discharge to 30 amps I believe you have to take a resistor out of the equation.

Silverbullet555

iTrader: (16)

I'd have to go look. There is much more information on rcgroups as it relates to the icharger. They have some mathematical calculations on what is needed to make it work. It's not exactly .25. I just know I solved it by adjusting the resistor bank. I'll take a look this morning and perhaps post a pic.

Marcos.J

iTrader: (239)

doesn’t look pretty but with my S6 this gives me 39.92 amps discharging total cost $7.95 cents

Red5Ltr

iTrader: (24)

I'd love to see how you made a 1S work along with balance.
Thanks Man!

Marcos.J

iTrader: (239)

easy take the balancing plug and clip it to the positive plug from the charger to the battery

Alexv2024

iTrader: (2)

It is not "What is required by the icharger family" the ohms required change based on the battery you have and the amps you want to discharge at. Amps= voltage x resistance. So if the battery voltage goes down you need lower resistance to draw more amps.

Red5Ltr

iTrader: (24)

The negative lead needs to be connected to the battery as well? Correct? I believe thats the negative to the balance port.

Roelof

Those calculations are also explained in the manual.....
Basically it is the basi ohms law. R=U / I And P=U x I

Marcos.J

iTrader: (239)

hook up the battery normal then take the balancing plug and clip it to the positive post