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Originally Posted by kunemlavat
(Post 15382465)
My resistors came in today! Just need to figure out something to mount them on, fans and heatsinks are in order also. I will take pictures of the build and try to make it clean as possiable! Was thinking of the wiring and probably going to straight wire the fans direct to the power supply. Main reason is because when the battery gets lower and lower voltage the fans spin slower, any input on this? Thanks! https://www.ebay.com/itm/Thermostat-...frcectupt=true My fan was 6V, so I also have a voltage regulator that steps down the 12V. Thermostat switch is in-between 3rd and 4th resistor from the fan side, as my fan is mounted on one end and blows across the heat sinks left to right.. |
Ok now that I think about it I’m not sure if there is a way to wire fans to the resistors as this bank is for a x6 charger with only positive wire going through the discharge bank |
Almost the full battery voltage will be over the resistors. So you do need fans working at that voltage. With 2S that is simple because 5 or 6v fans can be found (you only need a resistor or a few diodes to lower the voltage). With 1S that is not that simple.
But from own experience I can tell you that is no good idea. When the cooling stops when the discharging has ended the remaining heat will heat up the while system a lot. I finally decided to give the fans a continious voltage. The idea of a temp switch is better but in the world of PC fan controlers there are even rpm regulated controlers to be found https://www.ebay.co.uk/itm/PWM-4-Wir...8lY0:rk:4:pf:1 |
Heat Soak..
like when you turn off your car engine... heat continues to build.. for a limited amount of time.. same with engine turbochargers... a cool down time is needed. but in electronics... even a few seconds can destroy.. and with fet's... thermo runaway.. |
https://cimg1.ibsrv.net/gimg/www.rct...feb383348.jpeg https://cimg2.ibsrv.net/gimg/www.rct...c6d74f292.jpeg So I got all my parts in and put this bank together, 100 watt 1 ohm resistors. 5 total running the positive wire through the bank for my X6 Charger, I can only get about 4amps of discharge? Im not sure if I did something wrong or there is a problem with the charger? |
You need to create an actual discharge profile that is added to the first menu.
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Any info on how to do this? thanks |
Any help would be greatly appreciated |
Look into the X6 topic, there are some charger settings explained to make the resistor bank work.
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Thanks for all the help from everyone! all is working great now after I created a discharge profile! Thanks!! |
i made my own from parts off ebay...
100W 1 ohm resistors and 50mm fans... threw on a digital volt meter. https://i1293.photobucket.com/albums...psd0rxr0o4.jpg |
How many
How many resisters are needed to do 40 app discharge?
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Originally Posted by paintchip31
(Post 15736673)
How many resisters are needed to do 40 app discharge?
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Originally Posted by paintchip31
(Post 15736673)
How many resisters are needed to do 40 app discharge?
Impossible to find one so the easiest way is 5x 1 Ohm - 100w parallel or like 1000x 200 ohm - 0.5w parallel ;) |
Putting together parts for my resistor bank. Have 5 resistors on the way. Picked up four fans and this heatsink.
I purposefully bought it to be wide enough that the wiring would all be narrower than the heatsink. Two thoughts, I might want to get a couple bigger fans for the fin side. Is there anything I may have overlooked on the downside of using a heatsink wider than the ends of the resistor wires? https://cimg5.ibsrv.net/gimg/www.rct...186d338912.jpg |
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