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-   -   ROAR Approved Chargers (https://www.rctech.net/forum/electric-road/435618-roar-approved-chargers.html)

Bubblehead 09-17-2010 08:13 PM

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.

Andy Koback 09-17-2010 08:22 PM

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.

Bubblehead 09-17-2010 08:30 PM

Andy, If you went to tech and your batteries were 8.46V, what would you do to get your batteries to 8.44V?

CarbonJoe 09-17-2010 08:32 PM

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.

CarbonJoe 09-17-2010 08:36 PM


Originally Posted by Bubblehead (Post 7953590)
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).

Still Bill 09-17-2010 08:40 PM


Originally Posted by Bubblehead (Post 7953521)
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.

Chaz955i 09-17-2010 08:40 PM


Originally Posted by CarbonJoe (Post 7953616)
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?

Bubblehead 09-17-2010 08:49 PM

I was looking at the rules and it states 6 Nimh or 2s Lipo. Is there any mixing of batteries? Nimh running with Lipo

CarbonJoe 09-17-2010 08:49 PM


Originally Posted by Chaz955i (Post 7953641)
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.

Bubblehead 09-17-2010 08:52 PM


Originally Posted by Still Bill (Post 7953635)
What charger do you have? Some higher end units are adjustable.

It's a Thunder Power TP-610C.

CarbonJoe 09-17-2010 08:52 PM


Originally Posted by Bubblehead (Post 7953678)
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.

Bubblehead 09-17-2010 08:59 PM

What I mean can I have Nimh in my car and you have Lipo's in your car?

Still Bill 09-17-2010 09:05 PM


Originally Posted by Bubblehead (Post 7953690)
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

CarbonJoe 09-17-2010 09:12 PM


Originally Posted by Bubblehead (Post 7953717)
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.

Ron Goetter 09-17-2010 09:13 PM

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.


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