Lipo Load Bank for Discarging (moved from swap shop)

[longballlumber]

I wanted to bring this back to the top. I am looking to build one of these.

I would be willing to build 2 at the same time if someone was interested. Since Tyler posted his prices have gone up and parts alone one would cost $250 not including shipping. Is anyone interested? If not I will only buy enough parts for myself.

2 of these resistors: http://www.alliedele...k1r0e/70022401/
1 of these heat sinks: http://www.alliedele...06000/70115158/
Thermal grease if you don't already have it: http://www.alliedele...-150g/70125596/
2 of these fans: http://www.alliedele...624hh/70104890/

Thanks
Mike

[ray schrauwen]

Links don't work for me but, may work for others.

[ray schrauwen]

I was maybe thinking of building one since I have everything except the resistors. What is the price at alliedele for resistors?

[longballlumber]

$76 x2

http://www.alliedelec.com/ohmite-tap600k1r0e/70022401/

[JMSCARD]

So what would the total cost be, just wondering... I find it a huge pia to discharge my larger packs, no super quick way to do it... and often I bite off more then I can chew when I charge more lipos for the day then I end up using...

[longballlumber]

After sleeping on it, I am going to retract my offer. There really isn't any benefit buying parts for one assembly or two. However, I fixed the links below. The total cost is just a hair under $250 (shipping NOT included). Thanks again to Tyler, I am simply regurgitating the info he provided directly to me.

2 of these resistors: http://www.alliedelec.com/ohmite-tap600k1r0e/70022401/
1 of these heat sinks: http://www.alliedelec.com/aavid-ther...6000/70115158/
Thermal grease if you don't already have it: http://www.alliedelec.com/mg-chemica...150g/70125596/
2 of these fans: http://www.alliedelec.com/ebm-papst-624hh/70104890/

[TRUCKPULL]

I use a set of 8 of these in series for my 2S and 4S packs.
6 of these in series would be good for 6S packs.

http://ca-en.alliedelec.com/arcol-hs50-2r5-f/70596828/

I forgot to say, you can also use these to cook on.

Larry

[RaceMechaniX]

Anytime Mike,

I also want to stress I would not recommend using these unattended. The loads banks will draw about 22A@35V when wired in series and 45A@20V when wired in parallel. It only takes several minutes to fully dump a 5000mAh battery and it's very easy to walk away and forget.

I recommend using these through a charger capable of controlling the discharge like an iCharger Duo. This will safely monitor voltage and temp of the discharging battery.

If you do use it as a standalone discharger, please invest in a simple cell checker with low voltage buzzer.

Tyler

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[longballlumber]

Well, I finally got mine assembled and started "fiddling" around with it last night. Should be a pretty good tool, but still have lots to learn. Thanks again to Tyler to helping me along the way!

[Darin Jordan]

Mike, I just finished mine up as well (THANKS TYLER!!)...

Even came up with a way to add some rubber feet to it. I can thread in 1/4-20 Furniture posts/feet into these rubber inserts, if desired. And I added a pair of 4mm taps, in case I decide (probably won't) to run the fans off the load, rather than the power supply, or for plugging in a voltage monitor of some kind.

Is that the iCharger S/W you have there on your laptop??

Mine is setup in parallel, since I don't generally use anything over a 4S pack, and my 6S setups use two 3S packs.

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[Darin Jordan]

The total cost is just a hair under $250 (shipping NOT included). Thanks again to Tyler, I am simply regurgitating the info he provided directly to me.

2 of these resistors: http://www.alliedelec.com/ohmite-tap600k1r0e/70022401/
1 of these heat sinks: http://www.alliedelec.com/aavid-ther...6000/70115158/
Thermal grease if you don't already have it: http://www.alliedelec.com/mg-chemica...150g/70125596/
2 of these fans: http://www.alliedelec.com/ebm-papst-624hh/70104890/

I think the prices must have gone up... My parts cost $317.00 shipped, and I probably have another $80+ in wire, contacts, etc. A lot, I know, but sometimes, you just have to pay to play the game, and this will have enormous benefits for Time-Trials and heat racing, as well as general battery management.

[longballlumber]

Mike, I just finished mine up as well (THANKS TYLER!!)...

Even came up with a way to add some rubber feet to it. I can thread in 1/4-20 Furniture posts/feet into these rubber inserts, if desired. And I added a pair of 4mm taps, in case I decide (probably won't) to run the fans off the load, rather than the power supply, or for plugging in a voltage monitor of some kind.

Is that the iCharger S/W you have there on your laptop??

Mine is setup in parallel, since I don't generally use anything over a 4S pack, and my 6S setups use two 3S packs.

The Feet are a good idea. Mine was already sliding around on my work surface. The third fan is probably a good idea too. I was discharging a 6S pack last night and that aluminum heat sink got up to 185F! I need to make different jumpers for parallel too. Although I do have some 6S packs I will be using 4S mostly.

The software on the laptop is LogView. I don't know much about it, but it seems to be a freeware/shareware type tool. I think they Hyperion's use the same software. Just another thing for me to learn.

http://www.logview.info/forum/index.php?pages/home/

Later,
Ball

[Darin Jordan]

Thanks, Mike!

[ray schrauwen]

185F, whoa! Those are huge heat sinks. What about fans on the other side to speed up air flow?

[longballlumber]

185F, whoa! Those are huge heat sinks. What about fans on the other side to speed up air flow?

When you think about it; it's ALOT of energy that is being turned into heat in only a few mins. I don't suspect you will get the actual "peak" temp down, but more fans would minimize how long that "peak" is sustained. Once the load ramps down the 2 fans cool everything very quickly.