How to build your own automatic and programmable 6S discharger

[Fylers]

With my no contact gun its between 130 and 140 degrees F on a heat sink. Hope this helps.

[Sirolf]

Thanks...

still building;

[pctomlin]

Originally Posted by Sirolf

Thanks...

still building;

That is interesting, can't wait to see the end product.

[Sirolf]

12S discharger/lipo heaterbox All-in-1

[Fylers]

Please let us see the end result.
Thanks

[Sirolf]

I will.. i like to share these things with fellow freakers.. right?
But for now still waiting on some parts to be CNC drilled..

[nbells]

Don't want to appear like a right a*s* but remember to sleeve all soldered joints and make sure that each terminal cannot short to ground via the heatsink

[Sirolf]

Originally Posted by nbells

Don't want to appear like a right a*s* but remember to sleeve all soldered joints and make sure that each terminal cannot short to ground via the heatsink

All done after i took the photo's.. is all good now.
Thanks for noticing btw

[Sirolf]

updates on my heater/discharger

[Fylers]

Well how does it work? Hopefully its finished.

[Sirolf]

Yup... works excellent.

Look here for more info: https://www.helifreak.com/showthread.php?t=700049

[Fylers]

Extremely well done Sirolf , and I don't care what anybody says. I use mine all the time, this is a must have for electric flyers. Hands down!

Thanks

[Fylers]

Here is another option

https://www.rcgroups.com/forums/show...charger/page35

Post 520

[Fylers]

Originally Posted by Fylers

Here is another option

https://www.rcgroups.com/forums/show...charger/page35

Post 520

Sorry, here is the correct page to 1st. post.
https://www.rcgroups.com/forums/show...iPo-discharger

[Fylers]

Originally Posted by Fylers

Many thanks to all that have contributed to this project.
This is what I came up with combining all our knowledge, The perfect discharger.
And perfectly self contained, no outside power needed to operate this unit(other than the batteries you wish to discharge).
The Cell-log 8 operates the trip circuit thru the relays from the power of the discharge batteries.
One 24v relay and one 18v relay with coils to handle 3s to 8s setups. Of course it's your choice according to your application.
Also the heat sink fan, and the case fan run from main pack thru National Semiconductors LM 317's per pic., using R1 and R2 to supply the correct fan voltages.
This unit is also capable of parallel charge setups with a Para board or just two batteries per pic. with a single parallel connector, at whatever amp setting you would like for your particular setup.
This unit uses amp settings instead of battery cell amount for selecting the discharge rate. Totally your choice of settings, can be just about anything from 1.5 amps to 30amps or more. Amps selectable with switches, and led's show switch position.
This is more versatile than having cell limits. My original schematic shows the trip circuit with load resisters, but all you have to do use the LM317's instead of the resisters at .23 cents each online.
Cost is around $17 , most parts in my garage from computers and years of saving.
I have been using this unit for a couple of weeks now, and it works perfect on my 6s and 4s batteries.
All my 1s-3s batteries discharge thru my TP820 with 100watts and 20 amps for discharge it's no problem for these packs.

Remember no series discharging with this setup. Separate batteries or short will result. Also, the unit is a 3-6s pack discharger, Thank you.

[Fylers]

Originally Posted by tggilkey

I just finished building a discharger using Fyler's schematic in post 81. I have a problem with getting it to start with the Cell Log 8M. I may have fried the alarm but for a different reason than the common wrong way diode setup. I want to use this to discharge 2 5S packs (in reality a 10S pack) The relay, resistors for load, fans for cooling the heatsink, etc. are all sized to deal with the higher voltage -- and I made the assumption that because the Cell Log 8 had a 50V/500ma limit that I would be OK running a 10S battery through it. If it makes any difference I have version 2.0.8 of the Cell Log 8M.

When I first plugged in the balance lead (only space for one from one of the 5S packs) there was a spark that I was not expecting... The Cell Log still shows the cell voltages for the individual cells. The diode appears to be hooked up correctly. The pushbutton start works properly if the the alarm lead (removed form the Cell Log) is jumpered.

I have one uunused/new Cell Log 8 yet but don't want to try it until I get some collective wisdom from the contributors to this forum!

Ideas, suggestions, etc. will all be welcome. This has been fun to get the parts and think through, but I can see why charger builders don't make dischargers of any consequence that do what wwe want them to do.

Thanks, Tom

Remember no series discharging with this setup. Separate batteries or short will result. Also, the unit is a 3-6s pack discharger, current unit did not require series testing. Thank you.