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 Post subject: Re: Battery Size
PostPosted: Sat Mar 17, 2018 6:00 am 
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Joined: Fri Nov 06, 2009 5:08 am
Posts: 1182
Location: Philly
I use a standard lead acid group 75 in the GTL. Even after the switch to EFI, it holds up through a session. I do make sure to charge it between every session.

With the ballast in the car now, I might switch to a group 78, just for the extra safety margin.

-Kyle


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 Post subject: Re: Battery Size
PostPosted: Sat Mar 17, 2018 7:00 am 
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Joined: Sun Aug 18, 2002 6:16 pm
Posts: 5373
Location: Oregon City, Or.
My car is light, I run an excide group 78 AGM battery and a mini 1 wire alternator. when you need the cool suit and helmet blower you just don't have to worry.

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Joe Harlan Member #175515


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 Post subject: Re: Battery Size
PostPosted: Sat Mar 17, 2018 7:35 am 
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Joined: Fri Oct 01, 2010 9:21 am
Posts: 1136
I don't like having to do "something else" between sessions. The mini EastCoast alternator on my miata cost only 2hp peak.

I figured if I ever got to the podium I'd go the extra mile; until then, I didn't feel it was worth the time of having the generator running, all that stuff.

To answer your question, you'd need an ammeter to get close, then figure out how long you want to run, then figure out how long you would go from full charge to say 11.8v or something really low that wouldnt' just destroy the battery over time.

As others have said, if you need the weight anyway, just go buy a big tractor battery and forget about trying to figure out the number.

Whatever you do, buy a deep cell, or AGM. They tolerate the discharge better than a normal battery.

OTOH if you are over weight, and you need the battery to be as light as possible, then you got some maths to do.


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 Post subject: Re: Battery Size
PostPosted: Mon Mar 19, 2018 8:33 am 
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Joined: Mon Aug 21, 2017 3:01 pm
Posts: 46
i use the ANTIGRAVITY BATTERIES AG-YTX12-16-R Lithium Battery 480CCA 12Volt 3Lbs 16 Cell. i have used it in 3 cars that i have owned.
the only problem we have had was when the battery was allowed to drain down in route to the runoffs. we charged it for to long and it melted down. my mistake
you have to use there charger, not a standard car charger.
i do run an alternator in the car
rick


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 Post subject: Re: Battery Size
PostPosted: Mon Mar 19, 2018 10:53 am 
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Joined: Sun Aug 18, 2002 6:16 pm
Posts: 5373
Location: Oregon City, Or.
I had one melt down using their charger.

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Joe Harlan Member #175515


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 Post subject: Re: Battery Size
PostPosted: Mon Mar 19, 2018 5:07 pm 
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Joined: Thu Mar 27, 2003 7:43 am
Posts: 595
Location: Pueblo West, CO
Lithium battery fires are the same as magnesium fires (class D)

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Bob Cancellieri


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