ryan wrote:Thanks fractal. Can you tell me about the 500 resistor instead of 1000 like the Methods Throttle Retard cable? I'm also using a Lyen controller (18-fet). Do I need to switch that out of Methods' stock kit?
ryan wrote:The closest I could find was 470 Ohms (1/4w). Is that close enough?
methods wrote:You would use a 100.8V 10A CC/CV power supply or charger
Each board (4 of them) would need a "balance tap" coming out
To balance you would use 4 x Battery Medic ($15 each) or whatever you prefer.
* Try a BMSBattery Charger - we are ordering 4 or 5 of those.
zukster wrote:For this example, where do I buy a Power Supply that delivers exactly 100.8V?
For the above, I'm guessing that it is a 24S Total Pack. 24 x 4.2V max = 100.8V for the charger or power supply.
For this example, where do I buy a Power Supply that delivers exactly 100.8V? I'm guessing that this can be a bit higher and then the HVC breaker will just kick in. If you went lower, I guess your cells would never quite make it up to 4.2V each. I might not want one from BMSBattery necessarily.
How much tolerance is there in the Voltage being supplied? What does CC/CV mean?
Here was the link to the HobbyKing Batter Medic for people reading this:
http://www.hobbyking.com/hobbyking/stor ... em_6S.html
For my setup, I don't think I'll ever go over 18S or 18 x 4.2V = 75.6V.
amberwolf wrote:Use two in series. Or more. Get one that is adjustable voltage and adjustable current limiting, and the other two can be fixed voltage and current, as long as they will deliver at least the 10A you want, and are isolated (AC input is not electrically connected to the DC output at all, including ground).
dougnutz wrote:cc/cv refers to constant current/ constant voltage If I understand it right the charger starts out with constant current then switches modes to constant voltage as the pack nears the cutoff voltage of the charger. Pretty much every charger I have seen that is designed for lithium does this.
liveforphysics wrote:What Amber said is correct, all server and PC supplies do not have a CC mode at all. This means you must put something with a CC mode in series if you want to charge from them.
zukster wrote:So use some server PS's in series with one smart PS that can do CC? How does this limit what's coming out of the server PS's?
amberwolf wrote:zukster wrote:So use some server PS's in series with one smart PS that can do CC? How does this limit what's coming out of the server PS's?
Because all current in a series circuit is the same. Lower current in one place and it drops in all of them.
methods wrote:Thanks to Jeff for the catching the error.... (somebody is paying attention )
methods wrote:Here is how it works:
Normally - just plug in your charger and charge away!
If for some reason one of your cells gets overcharged this breaker will "lock up" and terminate charge. If this happens, please inspect your pack to determine the problem. After you have solved the problem - just press the green RESET button and you will be able to charge again.
The system is in the "ready" state - no need to press the RESET button unless something goes wrong. Thresholds are set at 4.29V so you should NOT need to press this button very often.... If you do, consider lowering your charge voltage or balancing your pack. -methods