video: 10sA123 Buggy with eagletree inserts - Page 4 - RC-Monster Forums

lutach · 11.11.2007, 02:21 PM

Here are a couple of links that will make a lot of A123 users happy:

http://www.rcgroups.com/forums/showp...postcount=1537
http://www.youtube.com/watch?v=q-1fb9_V2II

Serum · 11.11.2007, 02:52 PM

i would say, That HY5020 can be used for lipo's too, since it uses CC,CV

that's neat...!

lutach · 11.11.2007, 03:25 PM

There are other power supplies. I might get one from the following manufacture:

http://www.lambda-hp.com/

zeropointbug · 11.11.2007, 04:09 PM

Those look pretty nice Lutach... any word on prices for the 750watt models? I love mine, but it is pretty limited with 20 volts/10amps. I would like to go at least 10s A123 in the future... but I suppose I could split the pack up into 5s packs, and charge them in parallel...?

lutach · 11.11.2007, 04:11 PM

I found some 36V 20A power supplies on ebay for less then $200. You can also buy that HY50290 here: http://bigerc.com/product_info.php?products_id=170

aqwut · 11.11.2007, 04:12 PM

F*CKING AWESOME...
Thanks Mr. "OLNY in Brasil"

lutach · 11.11.2007, 04:22 PM

Quote:

Originally Posted by aqwut

F*CKING AWESOME...
Thanks Mr. "OLNY in Brasil"

Brasilians kind of know how to spice things up LOL. I'm trying my best to help out as much as I can.

aqwut · 11.11.2007, 04:45 PM

being able to charge that fast, I might just have to leave the batteries in each rc toy permanently...

othello · 11.11.2007, 07:10 PM

@serum
>In the first vid, your batteries gave you a 29V@ 35A load, while the 2nd one >gave you a 27V@35A load. Are this different batteries?

I have 2 10s battery packs. Both battery packs come from different Dewalt packs but were built the same way. When driving i always notice that my second battery pack gives a bit more top speed. So it must hold voltage a little bit better than my first pack. But to be honest i never compared my eagletree graphs with this in mind.

Both videos were shot on the same day. The first posted video was actually shot after the second posted video. So on the first video i must have used my second battery pack which at this point must have been better warmed up since we made some very short breaks while we shot at different spots. This part of the video was shot when the battery pack was about half empty. So heat might have played a role also.

Another possible answer might be video capturing itself which i did with 25 frames per second. I don't know how often the voltage gauge is refreshed from the eagletree software (let's suppose at least as often as the LCDs refresh rate which is at 50hz) ... so while capturing i might miss some frames where the needle of the gauge is already at a different point. So this also can explain the voltage difference at the same amperage.

>About these A123 cells; i just read a guy here in Holland is charging his >13S2P pack at 1000watts.. How nice..

Those cells can take a huge abuse even when charged at higher speed then 10A. I myself first used a laboratory power supply which is able to provide 720 Watt (36V and 20A). But i never used it up to its full potential. After 15 charges it broke down on me and since then i use the Hyperion 1210i which is able to recharge one of my packs in 30 minutes at 4-5A.

Since my truggy uses around 400 Watt average i would need a charger which is able to provide 400 Watt to recharge my 2nd battery pack while driving. This way i could drive all day long without a stop. But this is not my usual driving profile.

My second battery pack has a cell which only provides 2000mAh instead of 2300mAh. So it sometimes happens that i overdischarge this cell and 2 or 3 times i already measured her at 0,9V. While recharging at 5A she balances herself and at the end of the charging process she is within 0,01V when compared to the other cells. I never could have done that with a lipo cell. That is one reason i will stay with those heavier A123 cells. They are simply fool proof.

Serum · 11.12.2007, 02:42 AM

Thanks for explaining!

Sounds like those A123 cells have got some nice features..

11.13.2007, 04:48 PM

Quote:

Originally Posted by aqwut

Why does all the good stuff always accross the pond....
That's awesome.. i gotta get me one for Christmas.. Thanks Serum..

Possibly because they have strict noise regulations in Germany. Electric powered RC is very dominant there.

04:54 PM

I only spotted this thread now. Great setup. Gives me more convidence in mine which will hopefully be finished one day. I wish more Europeans would post their HV experiences here. :) It's the only to go...