danulmer18

iTrader: (5)

Hey guys, I know most people will say 25 c is good enough for 1/8 but has anyone stuck an eagle tree on a 1/8 buggy and seen how many amps a tekin 1900 (or similar) draws on average?

I plan on getting a thunder power 5400 25c pack which allows 135 amps to be drawn. I don't want to work my batts too hard

What is an average 1/8 buggy amp draw?

Thanks

b4maz

iTrader: (8)

http://www.rctech.net/forum/7673835-post6.html

danulmer18

iTrader: (5)

Great post thanks

Integra

iTrader: (8)

There's good reason Randy and Ty over @ Tekin Recommend a Minimum of 30C.

fazznick

iTrader: (2)

135 amps is close. The batteries I use are 135 amps and I'm using the tekin 1900/rx8 combo. The batteries get up to 110 degrees after a 10 min run. It is really the lowest you can go. They have held up just fine but I wouldn't recommend them. I feel like I'm taking a chance with them.

Ostach24

iTrader: (104)

Ppl told me an 8000 25c wouldnt be good with my tekin and kershaw in 1/8, but i have been running it and my motor and esc stay cool and the batteries stay cool too. I run other batteries and some of them get hot, and they are 30 40 and 45 c, so i think it will work just try them and keep an eye on them.

fazznick

iTrader: (2)

8000mah at 25c adds up to 200 amps. 200 amps is plenty. Those people didn't know what they are talking about. The tekin motors can pull 125 amps. The more amps you have the cooler the batteries should be after a run. Also I would use connectors such as the 5.5 or 6.5mm bullet type. If you use deans or smaller bullets the motor will try to draw the amps from the battery but it won't be able to deliver them. This can heat up the battery no matter how many amps the battery can deliver.

danulmer18

iTrader: (5)

Are you saying deans are not good for 1/8? What is the amp rating for deans? Everyone I know uses deans on 1/8

the thunder power stats on the sport race 4s 5400 pack say 135a constant and 250a peak. I can't imagine my hyper 9e drawing 135a on average. Thunder power are good cells arn't they?

fievel

iTrader: (5)

I have been running that same TP 4s 5400mah 25c sport race pack for the past 4 months in my Ve8. I havent had any trouble with it at all. I did however have trouble with using 25c rated hyperion batteries. I spoke with Ty at Tekin about the TP 25c packs and was told that it was comparable to a 30-35c turnigy pack from hk. I would like to get some higher c rated packs to be safe but its hard to find 5000+mah packs that fit the Ve8.

Ostach24

iTrader: (104)

Lol it was randy pike from tekin hahaha but idk how do do the conversions to figure out amps i just know he and others said not to and only run 30c but mine works and runs cool. Someone told me to run them and they had plenty so i did. My 3800 45c gets hot so do my 5000 28c, but 25c 8000 dont so idk.

KniteWulfe

iTrader: (2)

Your batteries don't need to be cool after a run, in fact you get more power when they are warm. They shouldn't puff or get hot though.

That's strange b4maz, my 1800 geared for the exact same speed only hits about 100-110A max on most runs but I have seen a 138A spike. It may have something to do with my track being fairly low traction though. What kind of temps are you hitting?

Average amp draw on my motors is usually around 10-15A in my tests of the 1515-2200 and the 1512-1800.

135A continuous should be plenty if they are good packs, which from what I hear those thunderpowers are.

Fievel what problem did you have with the 25c hyperions? I was planning to pick some 25c 5000's up but now I'm not so sure. I'm having issues with my 30c turnigy packs dropping voltage and triggering the lvc after just 1500mah, and losing too much power about halfway through the packs. Would I be better off with the enerland 4500 42c packs or their 5050 35c packs instead of the hyperions?

fazznick

iTrader: (2)

Some of you may not understand what I was saying. Its more about the amps the battery can put out than the c-rating. Also the c rating battery manufactures use may or may not be accurate. Testing people have done on the forum has shown this. I am not saying that your motor will pull 125 amps in your setup but it can.

When the 1/8 scale electric was getting started most batteries didn't have the high c rating they have now. Batteries were blowing up and esc's were getting fried. Also as far as I know there is no standard way of measuring the c a battery puts out. Different companies use different ways of measuring.

Warm batteries are fine but you don't want hot batteries. Like I said in an earlier post my batteries get warm and they are fine. They got hot when I was using deans. I used them one race session and they were getting so hot I couldn't touch them long enough to unplug them. The 5.5mm bullets are rated to over twice what deans are.

Im not trying to tell you that you cant use batteries or the deans. I am just telling you what can cause too much heat and cause the batteries to fail.

To find out the amps the battery can deliver- (mah/1000) x C rating

fazznick

iTrader: (2)

First of all I have a lot of respect for that guy. Second, how can he say 200 amps constant is not enough. By the way, you said your batteries run cool so how am I wrong? Unless he was referring to the esc trying to pull more amps for that motor. The RX8 can pull 210 amps in the right application.

Ostach24

iTrader: (104)

Im not saying you are wrong, im saying mine stayed cool. It could have been you in the other thread that told me i could run them. Yes randy is good, but sometimes ppl make mistakes or stick to an idea bc they have to for one reason or another. If he told me 25c was ok and my stuff fried he would have to fix my stuff bc of it for free. Next i feel you have a good knowledge so im saying listen to you. My 8000s 25c works my 5000 28c gets hot and my 3800 45c gets hot so my results show you to be correct, or support you. Chill bra these are just rc cars.

fievel

iTrader: (5)

The 25c battery kept becoming very unbalanced after 10min runs. I have my LVC set to 13.43, but even without hitting the LVC the battery would be off by .5v. This could be just a bad battery, I also have a hyperion 35c 4200 that works great. i have had the 4200 for about 6 months and it still balances perfectly. I dont know if the balancing is caused by the c rating but from what i have read if the battery has a higher c rating it tends to stay balanced better and keep voltage under loading.