R/C Tech Forums

Go Back   R/C Tech Forums > General Forums > Electric On-Road

Reply
 
Thread Tools Search this Thread
Old 09-01-2006, 01:32 PM   #901
Team Tekin
 
Tekin Prez's Avatar
 
Join Date: Mar 2005
Posts: 1,047
Default

Everyone is thinking too long term... We are loading the battery and letting go thousands of times per second. When a motor is spooled out it is really only seeing the few volts left that have not been canceled by the motors back EMF. If it is slow on top then the battery is getting hammered during accel.

If you do not have a voltage cutoff, watch the clock... safety or not it is hard on your batteries to drive them when they are noticeably slow.

All new Tekin products have an adjustable voltage cutoff.

Tekin Prez
__________________
[email protected]
Smarter, Smaller, Faster....
www.teamtekin.com

Last edited by Tekin Prez; 09-05-2006 at 07:16 PM.
Tekin Prez is offline   Reply With Quote
Old 09-01-2006, 03:14 PM   #902
Tech Elite
 
bvoltz's Avatar
 
Join Date: Jun 2005
Location: Bedtime with Teddi
Posts: 3,635
Trader Rating: 44 (100%+)
Default

Quote:
Originally Posted by padailey
I am about to dive into the lipo world after doing a lot of reading. I have not been following this thread from the beginning but have recently read the whole thing. My main question is the about low voltage cutoffs. I think the main thought here is they are not needed because you will feel it in plenty of time. Although I believe you I'm still a little concerned because of not having a lipo before and don't want to ruin it. Can anyone tell me approximately where the voltage is when the power begins to drop off? If it starts to drop off at 3.3 per cell for example I could see where the LVC isn't really necessary. Sorry if this has been answered before but the 30 pages of posts are kinda a blur.
With my 4800, you feel it when you have about 6.0 left. And I mean you you really feel it. Your car slows down by half all the sudden, you know it is time to take off the track.. You have plenty to get around the track back into the pits....
bvoltz is offline   Reply With Quote
Old 09-01-2006, 10:17 PM   #903
Tech Champion
 
YR4Dude's Avatar
 
Join Date: Sep 2004
Location: So Cal
Posts: 5,625
Trader Rating: 44 (100%+)
Default Lipo Chargers

Currently I have been using a Much-More to charge my NiMh batteries and it also capable of charging LiPos but at only 1Amp. So I've been looking for another charger that can charge at a higher rate. Heres what I found:

Orion Advantage with LiPo feature $189.99
Astro Flight Lithium $109.99
MRC Super Brain 977 $100.00
Duratrax ICE 119.99
Multiplex LN-5014 89.99

Of course the Orion is the obvious choice but what about the others? Will all LiPo chargers charge the same? Are some chargers more precise in "peak charging" LiPo cells than others?

Any advise would be great. Please be fair. No product bashing please. Lets have some good information for all to know.
YR4Dude is offline   Reply With Quote
Old 09-01-2006, 10:21 PM   #904
Tech Regular
 
SpeedyPenguin's Avatar
 
Join Date: Jan 2006
Location: Chandler, AZ
Posts: 310
Trader Rating: 1 (100%+)
Default

You have forgot about the new Orion avionics charger, which is around $80 and is quite small. There is a racer at our track who uses it for his Orion pack and a one cell pack for his 1/12 scale.
SpeedyPenguin is offline   Reply With Quote
Old 09-01-2006, 10:53 PM   #905
Tech Addict
 
Join Date: Apr 2005
Location: north-west Indiana
Posts: 749
Trader Rating: 18 (100%+)
Default

A year ago, I bought two ice chargers. I did this, because at the time I was using cheap peak chargers and needed to upgrade. Knowing that lipo's were coming I decided to buy chargers that charged lipo's as well as nimh. I can say that I am extremely happy with my decision. But the advantage charger has alot of the same features as the ice, and you can charge lipo's higher than a 1c rating. If I could change 2 things about the ice charger I would change the charge rate cutoff for lipo's and make it balance the lipo's. Regardless, it is very convenient to be able to see all the charging data. This is one thing I would look for in a charger as well. Anyways, that is my 2 cents.
Lipo's don't peak charge. They are charged by cc/cv (constant current/constant voltage). The only difference is the way other chargers charge them would be the ability to balance, and charging current.
trilerian is offline   Reply With Quote
Old 09-01-2006, 11:06 PM   #906
Tech Addict
 
Join Date: Dec 2004
Location: MI
Posts: 574
Trader Rating: 2 (100%+)
Default

My ESC does not have the LVC built in (Novak GTX). Would this device solve the LVC problem? http://www.fmadirect.com/detail.htm?item=1897&section=2
cvt01 is offline   Reply With Quote
Old 09-01-2006, 11:20 PM   #907
Tech Master
 
padailey's Avatar
 
Join Date: Nov 2005
Location: Council Bluffs, IA
Posts: 1,603
Trader Rating: 11 (100%+)
Default

Quote:
My ESC does not have the LVC built in (Novak GTX). Would this device solve the LVC problem?
From the site you mentioned it states. "The AVC1AIR will work with any ESC that provides motor cutoff on loss of signal." So I don't think it would be something you want with a GTX. I have found several that warn you with led's (which I don't have any idea how that would help) or warning beeps or throttle pulsing. But I have only found one that appears to cut power to the throttle. Even though it still needs to be shut off because it is still drawing a small amount of power.

I'm still learning about these but these two look the most promising that I have found.

http://www.fmadirect.com/Detail.htm?...117&section=45
http://www.boomboombatteries.com/pro...x?ProductID=62
__________________
www.hobbyplexraceway.com

Tamiya TRF417X (Lion's Automotive GTR)
Tamiya TRF416X
Tamiya F104W MP6/4 converted to F104X1 (Renault R30)
padailey is offline   Reply With Quote
Old 09-01-2006, 11:32 PM   #908
Tech Master
 
padailey's Avatar
 
Join Date: Nov 2005
Location: Council Bluffs, IA
Posts: 1,603
Trader Rating: 11 (100%+)
Default

Quote:
Currently I have been using a Much-More to charge my NiMh batteries and it also capable of charging LiPos but at only 1Amp. So I've been looking for another charger that can charge at a higher rate. Heres what I found:

Orion Advantage with LiPo feature $189.99
Astro Flight Lithium $109.99
MRC Super Brain 977 $100.00
Duratrax ICE 119.99
Multiplex LN-5014 89.99

Of course the Orion is the obvious choice but what about the others? Will all LiPo chargers charge the same? Are some chargers more precise in "peak charging" LiPo cells than others?

Any advise would be great. Please be fair. No product bashing please. Lets have some good information for all to know.
I have an ICE an would recommend that with no hesitation.. however are you just trying to charge lipos? If so I probably wouldn't spend the extra money on the ICE or Orion Advantage with Lipo. I've been looking at the Team Orion Avionics Advanced Flight Charger, Great Planes Electrifly Triton Jr, or HYPERION EOS 5i CHARGER. They all look very very similar and won't cost as much as some you listed. But again it depends on what you want the charger to do besides lipo.

http://www.teamorion-avionics.com/Ad...Flight+Charger
http://www.electrifly.com/chargers/gpmm3152.html
http://www.purehobby.com/Chargers/HP-EOS-5I.htm
__________________
www.hobbyplexraceway.com

Tamiya TRF417X (Lion's Automotive GTR)
Tamiya TRF416X
Tamiya F104W MP6/4 converted to F104X1 (Renault R30)
padailey is offline   Reply With Quote
Old 09-03-2006, 11:41 AM   #909
Tech Regular
 
Jeel's Avatar
 
Join Date: Jul 2004
Posts: 421
Trader Rating: 16 (100%+)
Default

With nitro season winding up here in New England, I will be heading indoors to race electric truck offroad indoors for the winter.

My current setup is a T4FT, GT7, 10x2. I use a CE Pitbull charger.

All of my batteries are spent from last year so I need to decide whether to buy nimhs and a Smart Tray for one more season (need at least 3 batts) or to buy an ICE charger and give the one 4800 Lipo a shot. We run 3 5 minute heats and a 5 minute main.

My only concern is with all of the safety issues I am hearing about Lipos...can anyone out there confirm that these are overblown?

Having just purchased my first home, the last thing I would need is to burn it down!
Jeel is offline   Reply With Quote
Old 09-03-2006, 11:51 AM   #910
Regional Moderator
 
Darkseid's Avatar
 
Join Date: Aug 2001
Location: At my computer, duh...
Posts: 9,033
Trader Rating: 8 (100%+)
Default

Quote:
Originally Posted by Jeel
My only concern is with all of the safety issues I am hearing about Lipos...can anyone out there confirm that these are overblown?

Having just purchased my first home, the last thing I would need is to burn it down!
The best thing I can tell you is to do your own research, and make up you own mind.

That may not seem like much help, but honestly, having people from both sides telling you their opinion is even less help.

Everything you want to know is here in this thread, just read through it and you'll see both sides, hear all the stories and be able to decide for yourself whats best for you now and in the future.

Good luck
__________________
TLR 22...Tamiya F104...
Darkseid is offline   Reply With Quote
Old 09-04-2006, 07:31 PM   #911
Tech Addict
 
Join Date: Dec 2004
Location: MI
Posts: 574
Trader Rating: 2 (100%+)
Default

This weekend we had a three day IIC Warm Up race (I'm just an average club racer but it is still fun). I used one pack for three days charged it 20+ times had no problem with it at all. It was not an Orion pack (wont fit in the T2 )but an other manufacturers LiPo. I'm pretty sure that the Orion would do the same.
I run 19T foam and however my driving suck big time there were no lack of power for sure... I'm done with the NiMH crap. Sold my old Advantage charger (no lipo feature ) and I will sell my dicharge trays as well. Do you think I can get $20 for my 3 months old SMC matched IB4200
cvt01 is offline   Reply With Quote
Old 09-04-2006, 10:58 PM   #912
Tech Champion
 
YR4Dude's Avatar
 
Join Date: Sep 2004
Location: So Cal
Posts: 5,625
Trader Rating: 44 (100%+)
Default

cvt01 - what pack was it that you used to fit in the the T2?
YR4Dude is offline   Reply With Quote
Old 09-05-2006, 09:25 AM   #913
Tech Addict
 
Join Date: Dec 2004
Location: MI
Posts: 574
Trader Rating: 2 (100%+)
Default

Apogee LiMn
cvt01 is offline   Reply With Quote
Old 09-05-2006, 09:33 AM   #914
Tech Master
 
Kings Kid's Avatar
 
Join Date: Sep 2005
Location: sw lower michigan
Posts: 1,681
Trader Rating: 35 (100%+)
Default

Quote:
Originally Posted by cvt01
My ESC does not have the LVC built in (Novak GTX). Would this device solve the LVC problem? http://www.fmadirect.com/detail.htm?item=1897&section=2
Yes cvt01, that is the same cutoff that is used in the no longer available scorpion batteries by FMA. The best charger for lipos only in my opinion is the scorpion. It balance charges, allows up to 10amps charging, and has adapters available for orion batteries as well as others
Kings Kid is offline   Reply With Quote
Old 09-05-2006, 10:17 AM   #915
Tech Addict
 
Join Date: Dec 2004
Location: MI
Posts: 574
Trader Rating: 2 (100%+)
Default

Platinum pack discharged at 20A (for comparison I've put in the 10A curve too)
Attached Thumbnails
Platinum Lipo-platinum-20a-dchg.png  
cvt01 is offline   Reply With Quote
Reply

Similar Threads
Thread Thread Starter Forum Replies Last Post
ORION PLATINUM 4800 LIPO sedanracer8 R/C Items: For Sale/Trade 21 12-18-2007 08:09 PM
>>> Orion Platinum 4800 Lipo <<< rraden R/C Items: For Sale/Trade 9 10-22-2007 09:55 AM
Is the Mamba Max 7700 to much for the Platinum 4800 Lipo _pilot_ Electric On-Road 2 10-10-2007 01:52 PM
Team Orion Platinum Lipo Pack danjoy25 Australia For Sale/Trade 0 05-10-2006 04:26 PM
FS Orion Platinum Lipo!!! Glowster21 R/C Items: For Sale/Trade 20 04-05-2006 06:37 PM



Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are Off



All times are GMT -7. It is currently 12:43 AM.


We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites.
Powered By: vBulletin v3.9.2.1
Privacy Policy | Terms of Use | Advertise Content © 2001-2011 RCTech.net