R/C Tech Forums

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

Reply
 
Thread Tools Search this Thread
Old 09-17-2010, 08:13 PM   #1
Tech Addict
 
Bubblehead's Avatar
 
Join Date: Jan 2008
Location: Portsmouth, VA
Posts: 708
Default ROAR Approved Chargers

Are there any ROAR approved chargers? I was told tonight that my charger is NOT legal, because my batteries off the charger was 8.5V. I'm new to LIPO's and all I did was set my charger to LIPO and start charging the LCD displayed 8.4V.
Bubblehead is offline   Reply With Quote
Old 09-17-2010, 08:22 PM   #2
Tech Elite
 
Join Date: Sep 2009
Location: Central Wisconsin USA
Posts: 3,339
Trader Rating: 217 (100%+)
Default

I don't know what the ROAR rules are regarding this issue but in the BRL League, (Oval) batteries can't read more than 8.44 volts for 2 cell and 4.22 volts for 1 cell at race check-in. Check with your local track directer and see what he says.
Andy Koback is offline   Reply With Quote
Old 09-17-2010, 08:30 PM   #3
Tech Addict
 
Bubblehead's Avatar
 
Join Date: Jan 2008
Location: Portsmouth, VA
Posts: 708
Default

Andy, If you went to tech and your batteries were 8.46V, what would you do to get your batteries to 8.44V?
Bubblehead is offline   Reply With Quote
Old 09-17-2010, 08:32 PM   #4
Regional Moderator
 
CarbonJoe's Avatar
 
Join Date: Jul 2006
Posts: 2,661
Default

There isn't such a thing. Approved motors, batteries, bodies, yes. Chargers, no.

http://www.roarracing.com/?page_id=14

ROAR rules for 2010 state that the maximum voltage for LiPo is 8.40v for 2s, 4.20v for 1s. No wiggle room anymore. Also, a maximum charge rate of 1C.
__________________
*** The Gate - Celebrating 8 years at the same location ***
The difference between genius and stupidity is that genius has its limits. - Albert Einstein
Understeer is when you hit the wall with the front of the car and oversteer is when you hit the wall with the rear of the car
CarbonJoe is offline   Reply With Quote
Old 09-17-2010, 08:36 PM   #5
Regional Moderator
 
CarbonJoe's Avatar
 
Join Date: Jul 2006
Posts: 2,661
Default

Quote:
Originally Posted by Bubblehead View Post
Andy, If you went to tech and your batteries were 8.46V, what would you do to get your batteries to 8.44V?
Turn on your car and yank the throttle until you meet the rules. However, at some ROAR races, they may DQ you if you are over voltage when you come to the tech table. What I suggest is to have your own volt meter, and "calibrate" it to what the official meter reads. For example, if the official meter reads your pack at 8.42 volts, but your meter reads 8.40 volts, you better make sure before you go to tech your meter reads 8.38 volts (0.02v "offset" from the official meter).
__________________
*** The Gate - Celebrating 8 years at the same location ***
The difference between genius and stupidity is that genius has its limits. - Albert Einstein
Understeer is when you hit the wall with the front of the car and oversteer is when you hit the wall with the rear of the car
CarbonJoe is offline   Reply With Quote
Old 09-17-2010, 08:40 PM   #6
Tech Champion
 
Still Bill's Avatar
 
Join Date: Jan 2004
Location: Reno, NV
Posts: 7,237
Trader Rating: 12 (100%+)
Default

Quote:
Originally Posted by Bubblehead View Post
Are there any ROAR approved chargers? I was told tonight that my charger is NOT legal, because my batteries off the charger was 8.5V. I'm new to LIPO's and all I did was set my charger to LIPO and start charging the LCD displayed 8.4V.
What charger do you have? Some higher end units are adjustable.
__________________
Constantly evolving CRC WGT and WGT-R/T...Carpet & Asphalt...All thanks to Team CRC.

And a pair of Associated B6 buggies for turf and clay tracks.
Still Bill is offline   Reply With Quote
Old 09-17-2010, 08:40 PM   #7
Tech Master
 
Chaz955i's Avatar
 
Join Date: May 2009
Location: NE Ohio
Posts: 1,022
Trader Rating: 5 (100%+)
Default

Quote:
Originally Posted by CarbonJoe View Post
Turn on your car and yank the throttle until you meet the rules. However, at some ROAR races, they may DQ you if you are over voltage when you come to the tech table. What I suggest is to have your own volt meter, and "calibrate" it to what the official meter reads. For example, if the official meter reads your pack at 8.42 volts, but your meter reads 8.40 volts, you better make sure before you go to tech your meter reads 8.38 volts (0.02v "offset" from the official meter).
Joe, I'm using a charger similar to the small HobbyKing you have. Is there a way to set the max voltage or is it a matter of using a meter and running some off to make sure the charge is not to high?
Chaz955i is offline   Reply With Quote
Old 09-17-2010, 08:49 PM   #8
Tech Addict
 
Bubblehead's Avatar
 
Join Date: Jan 2008
Location: Portsmouth, VA
Posts: 708
Default

I was looking at the rules and it states 6 Nimh or 2s Lipo. Is there any mixing of batteries? Nimh running with Lipo
Bubblehead is offline   Reply With Quote
Old 09-17-2010, 08:49 PM   #9
Regional Moderator
 
CarbonJoe's Avatar
 
Join Date: Jul 2006
Posts: 2,661
Default

Quote:
Originally Posted by Chaz955i View Post
Joe, I'm using a charger similar to the small HobbyKing you have. Is there a way to set the max voltage or is it a matter of using a meter and running some off to make sure the charge is not to high?
I just looked at the manual and didn't see anything to adjust or calibrate the cutoff voltage.
__________________
*** The Gate - Celebrating 8 years at the same location ***
The difference between genius and stupidity is that genius has its limits. - Albert Einstein
Understeer is when you hit the wall with the front of the car and oversteer is when you hit the wall with the rear of the car
CarbonJoe is offline   Reply With Quote
Old 09-17-2010, 08:52 PM   #10
Tech Addict
 
Bubblehead's Avatar
 
Join Date: Jan 2008
Location: Portsmouth, VA
Posts: 708
Default

Quote:
Originally Posted by Still Bill View Post
What charger do you have? Some higher end units are adjustable.
It's a Thunder Power TP-610C.
Bubblehead is offline   Reply With Quote
Old 09-17-2010, 08:52 PM   #11
Regional Moderator
 
CarbonJoe's Avatar
 
Join Date: Jul 2006
Posts: 2,661
Default

Quote:
Originally Posted by Bubblehead View Post
Is there any mixing of batteries? Nimh running with Lipo
To power the motor, bad idea! You could damage the LiPo...

Lots of people use different types between the main pack and the Rx pack.
__________________
*** The Gate - Celebrating 8 years at the same location ***
The difference between genius and stupidity is that genius has its limits. - Albert Einstein
Understeer is when you hit the wall with the front of the car and oversteer is when you hit the wall with the rear of the car
CarbonJoe is offline   Reply With Quote
Old 09-17-2010, 08:59 PM   #12
Tech Addict
 
Bubblehead's Avatar
 
Join Date: Jan 2008
Location: Portsmouth, VA
Posts: 708
Default

What I mean can I have Nimh in my car and you have Lipo's in your car?
Bubblehead is offline   Reply With Quote
Old 09-17-2010, 09:05 PM   #13
Tech Champion
 
Still Bill's Avatar
 
Join Date: Jan 2004
Location: Reno, NV
Posts: 7,237
Trader Rating: 12 (100%+)
Default

Quote:
Originally Posted by Bubblehead View Post
It's a Thunder Power TP-610C.
Hmmmm...TP makes good products so I am a bit surprised.

The online manual says that you can indicate percentage of charge. You could cut down on the charge that way. Read your manual for details.

Another thought is for you to check the voltage with another multi-meter. Theirs could be wrong.

Bill
__________________
Constantly evolving CRC WGT and WGT-R/T...Carpet & Asphalt...All thanks to Team CRC.

And a pair of Associated B6 buggies for turf and clay tracks.
Still Bill is offline   Reply With Quote
Old 09-17-2010, 09:12 PM   #14
Regional Moderator
 
CarbonJoe's Avatar
 
Join Date: Jul 2006
Posts: 2,661
Default

Quote:
Originally Posted by Bubblehead View Post
What I mean can I have Nimh in my car and you have Lipo's in your car?
Most bigger races don't allow that. One type only. Local clubs may allow that.
__________________
*** The Gate - Celebrating 8 years at the same location ***
The difference between genius and stupidity is that genius has its limits. - Albert Einstein
Understeer is when you hit the wall with the front of the car and oversteer is when you hit the wall with the rear of the car
CarbonJoe is offline   Reply With Quote
Old 09-17-2010, 09:13 PM   #15
Tech Master
 
Ron Goetter's Avatar
 
Join Date: Nov 2006
Location: Goatsville, PA
Posts: 1,950
Trader Rating: 17 (95%+)
Send a message via AIM to Ron Goetter
Default

You can turn off competition mode to lower finish charge voltage back to 8.40.

I would defiantly check your battery voltage with another multimeter to. I've seen multimeter be off by more then .10 before.
__________________
The Goat... B-Mainer Fo' life
-Awesomatix USA-ROCHE USA-Team CRC-ORCA-SIDE PIECE RACING-TEAM DAK-EA Motorsports-VP Fuel-Trains and Lanes-CR Graphics-TQ Wire-Horsham RC-rugburn anyone?
Shut up and Race!!!!
Ron Goetter is offline   Reply With Quote
Reply

Similar Threads
Thread Thread Starter Forum Replies Last Post
CHARGERS RC - Ipswich Offroad heavy Australian Racing 8244 07-09-2017 12:55 AM
ROAR to change lipo voltage to 4.20 and 8.40 1fastdude Electric On-Road 154 12-22-2009 07:43 PM
2008 Region 8 ROAR Offroad Regionals Aaron P Kansas/Missouri Racing 193 10-11-2008 09:41 AM
ROAR Approves LIPO yyhayyim Electric On-Road 232 01-23-2008 05:44 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 03:01 PM.


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