R/C Tech Forums

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

Reply
 
Thread Tools Search this Thread
Old 04-17-2012, 02:16 AM   #1
Tech Addict
 
wollow86's Avatar
 
Join Date: Mar 2011
Location: Hobart
Posts: 707
Trader Rating: 7 (100%+)
Default Field battery

I know there's been one or two threads on this already, but I've searched for an answer to my question and couldn't find one.

One of the local tracks I run at doesn't have power, normally I take 4 packs, between 2 cars. One is boosted stock and the other a mini. In total, I only need to charge 4 packs at the track, 2 for the stock TC, which use about 2500mah per run, and 2 for the mini which uses about 1200mah per run. I know 12v batteries aren't going to be 100% efficient, but essentially I need about 7400mah to put into the packs so say 10000 (which is 10Ah?) should cover it right? This bit is just really a clarification.

The part I couldn't find an answer for is if I need to run tyre warmers, how much will they use? I know its impossible to say exactly, but a ballpark would do. I'm using the muchmore 3080 (the one that just has the knob). Also, at home, or at the other powered track, what would a tyre truer need? My converted PC power supply works great for my charger and warmers, but cuts out when I turn on the truer, so I've been using the car battery to do it. I also noticed when I cut tyres on better power supplies, its very easy to stop the wheel from spinning, that doesn't happen on the car battery.

So having said 10Ah for the battery packs, would another 6Ah be enough?

I was hoping to get away with something smaller, like a motorcycle battery or something. I know people usually recommend deep cycle marine batteries, but they are expensive and large.

Finally, I was wondering if my rc charger will be able to recharge the larger battery? I'm using a Thunder T6 Multi.

Thanks for any help I can get.
__________________
Supporting Aussie hobby shops:
- www.MRJRacing.com.au - - www.feralbatteries.com.au - - www.actionrc.com.au -
wollow86 is offline   Reply With Quote
Old 04-17-2012, 03:44 AM   #2
Tech Elite
 
sosidge's Avatar
 
Join Date: Dec 2001
Location: Bristol, UK
Posts: 3,865
Default

I know a few people that use the 12V 10Ah gel cells. They are OK for a days charging but I think you might be a bit tight if you are using the warmers and the truer during the day as well.

Bear in mind that a leisure battery is designed for constant current draw, whereas most starter batteries are designed for a short peak current to start an engine from cold. The leisure battery will be more reliable over time than the car battery. You don't need an enormous one.

If your charger has a lead-acid setting (most recent LiPo chargers do, but I don't know your charger specifically) then you can use it to charge the 12V battery at home.
sosidge is offline   Reply With Quote
Old 04-17-2012, 03:52 AM   #3
Tech Addict
 
wollow86's Avatar
 
Join Date: Mar 2011
Location: Hobart
Posts: 707
Trader Rating: 7 (100%+)
Default

Thanks sosidge. My charger does do Pb batteries, I wanted to be sure that wouldnt be to big.

Just one question, what's a leisure battery?
__________________
Supporting Aussie hobby shops:
- www.MRJRacing.com.au - - www.feralbatteries.com.au - - www.actionrc.com.au -
wollow86 is offline   Reply With Quote
Old 04-17-2012, 04:20 AM   #4
Tech Elite
 
sosidge's Avatar
 
Join Date: Dec 2001
Location: Bristol, UK
Posts: 3,865
Default

Quote:
Originally Posted by wollow86 View Post
Thanks sosidge. My charger does do Pb batteries, I wanted to be sure that wouldnt be to big.

Just one question, what's a leisure battery?
It's just another name for a deep-cycle battery.
sosidge is offline   Reply With Quote
Old 04-18-2012, 04:09 AM   #5
Tech Initiate
 
Join Date: Aug 2005
Location: United Kingdom
Posts: 35
Send a message via ICQ to markrichards Send a message via AIM to markrichards Send a message via MSN to markrichards
Default

Tyre warmers seem to pull between 4 - 6 Amps. The reason your truer cuts the power supply is that on start up they pull a huge current that those power supplies cant cope with. However a leisure or car battery can. Leisure / marine batteries are best as they cope with the abuse well. A car battery, even out of a diesel, die fairly rapidly and wont recharge. Something in the range of 85A/hr leisure battery will do and cost about 70 and if looked after can last years.
One thing to note about the charger is that yes than can charge the Pb types but are not really meant for the huge marine ones. They tend to have a time lockout for one thing. A proper automotive charger with a maintenance mode is best and are cheap to.

I'm on the look out for something to power my tyre warmers seperately as a 12V has a fixed voltage and the more demand you put on it the lower the voltage drops.
markrichards is offline   Reply With Quote
Reply

Similar Threads
Thread Thread Starter Forum Replies Last Post
Powerline Race Club at Floyd Bennett Field TEAM BROOKLYN Racing Forum 4877 08-03-2011 04:31 PM
Intellect Battery 3800 rayhuang Electric On-Road 1166 05-30-2006 07:51 PM
Hara's mysterious battery charging aid EddieO Electric On-Road 170 08-04-2004 11:05 AM



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 05:28 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