Wiring Second Battery - Realm of Excursion



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Old 03-09-2007   #1 (permalink)
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Default Wiring Second Battery

When installing a second battery, is it necessary to run a negative (Ground) Wire from the second batt all the way to the hood battery negative post? Couldn't you get the same results grounding the second batt to the chassis? Would the extra resistance from the chassis (if there is any) cause charging issues?
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Old 03-09-2007   #2 (permalink)
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Originally Posted by X_Wing View Post
When installing a second battery, is it necessary to run a negative (Ground) Wire from the second batt all the way to the hood battery negative post? Couldn't you get the same results grounding the second batt to the chassis? Would the extra resistance from the chassis (if there is any) cause charging issues?
i wouldn't worry about running a ground wire to the front unless you have more than 1 run of 1/0. The chassis can carry a fair ammount of current(mecp guide calls it a HUGE gauge wire, lol). Just make sure you have good connections on both ends.

If the chassis couldn't carrry enough current you would get larger voltage drops than you should.
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Old 03-09-2007   #3 (permalink)
 
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Agreed ^^

BTW - don't forget to fuse that 2nd batt. TWO times! then once after the batt. between the batt. and the amp.

So one right after the batt. under the hood, once before the back batt, and once right after the back batt.

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Old 03-09-2007   #4 (permalink)
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^^^
agreed tooo

Definately fuse three times or more if you have multiple amps.
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Old 03-09-2007   #5 (permalink)
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Thanks for the help.

One more question.

I've read different opinions on whether you need or don't need an isolator. Do any of you use an isolator between batteries?
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Old 03-09-2007   #6 (permalink)
 
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Originally Posted by X_Wing View Post
Thanks for the help.

One more question.

I've read different opinions on whether you need or don't need an isolator. Do any of you use an isolator between batteries?
i don't...aslong as you dont play your system for TO LONG without ur Car running, you will be more than fine.

Also an isolator has resistance and you wont be pulling as much current threw as you could be...also you would only be running your system off of 1 batt.


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Old 03-09-2007   #7 (permalink)
 
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Originally Posted by X_Wing View Post
Thanks for the help.

One more question.

I've read different opinions on whether you need or don't need an isolator. Do any of you use an isolator between batteries?
some people say u do some people say u dont. The only reason i heard the reason to use isolators is that if your use 2 different batteries. Im no expert but thats wat i heard.
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Old 03-09-2007   #8 (permalink)
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if the batteries have the same resting voltage then i wouldn't worry about it.

But if you have one older more worn out battery that sits at 12.0 v and a newer battery that sits at 12.9v then the new battery will be discharged down to that 12.0 by the older battery(which isn't necisarilly good for the new battery, sitting lower than fully charged).
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Old 03-09-2007   #9 (permalink)
 
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some people say u do some people say u dont. The only reason i heard the reason to use isolators is that if your use 2 different batteries. Im no expert but thats wat i heard.
People CLAIM that one batterie (the bigger of the two) will somehow suck the power out of the littler one and kill it...

I haven't ran into anyone that this has actually happened to yet though...and both my batteries are in great shape, fully charged and always take a full charge.

Mike~
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Old 03-09-2007   #10 (permalink)
 
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Originally Posted by profundus-sanus View Post
if the batteries have the same resting voltage then i wouldn't worry about it.

But if you have one older more worn out battery that sits at 12.0 v and a newer battery that sits at 12.9v then the new battery will be discharged down to that 12.0 by the older battery(which isn't necisarilly good for the new battery, sitting lower than fully charged).
How?

If one can hold 12.9 and the other holds 12.0 wouldn't the extra current that the 12.0 batt cant hold go to the 12.9?


..or would they even them selfs out? (like a 12.4ish)

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Old 03-09-2007   #11 (permalink)
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I plan on going with (2) Kinetiks. The Calc on their site recommends a 1400 and an 1800. Their prices are kinda steep and IDK if I trust buying them from ebay. I may have to go with Optima just because I can get them locally.
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Old 03-09-2007   #12 (permalink)
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How?

If one can hold 12.9 and the other holds 12.0 wouldn't the extra current that the 12.0 batt cant hold go to the 12.9?


..or would they even them selfs out? (like a 12.4ish)

Mike~
Well, when you shut the car off the batteries should be fully charged(assuming they were given a chance) so it would not be able to be charged above that point.

I'm not totally sure how it works, but i think i have an idea out of my own knowledge of electricty and physics.

The 12.9 will still flow current through the 12.0 trying to reach equilibrium. The resistance will dissapate that flowing current to heat because the 12.0 battery is full and can't absorb the voltage. It will keep doing this until the equilibrium is reached.

Sound right?
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Old 03-09-2007   #13 (permalink)
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you should really read the stickys in this forum, you will learn alot about how this works

my advice, buy all the same brand and series of batteries, fuse your power wire twice for safety, and dont use an isolator

If you want a battery reccomendation, see if there is a batteries plus near you, and go with odyssey, their 2250 is about the same size as a monster and imo outperforms a monster, and their other batteries in the series are very small for the power they put out
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Old 03-09-2007   #14 (permalink)
 
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lol, yeah i guess i get what ur sayin.

: D

Thanks,
Mike~
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Old 03-09-2007   #15 (permalink)
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but yeah, if the two batteries charge at different levels the lower one will discharge the higher one

another thing, i always reccomend to go to a sealed battery, preferebly deep cycle, you dont realize how important this is til you have a wet cell explode on you because you worked it too hard, it took me 4 hours to clean up all the acid man
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Old 03-09-2007   #16 (permalink)
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but yeah, if the two batteries charge at different levels the lower one will discharge the higher one
not trying to be harsh in anyway, but isn't that what i said?

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another thing, i always reccomend to go to a sealed battery, preferebly deep cycle, you dont realize how important this is til you have a wet cell explode on you because you worked it too hard, it took me 4 hours to clean up all the acid man
Ouch!
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Old 03-09-2007   #17 (permalink)
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yeah pretty much, just backin up what ya said
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Old 03-09-2007   #18 (permalink)
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yeah pretty much, just backin up what ya said
good stuff. Just checkin.
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Old 03-09-2007   #19 (permalink)
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I added a post to the "electrical systems explained" sticky. Read that information and add to the discussion. I tried to cover as many configurations as I could think of and add to the post such that anyone asking these questions could be referred there.
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Not all isolator systems add resistance. I added a post to the "electrical systems explained" sticky. Read that information and add to the discussion. I tried to cover as many configurations as I could think of and add to the post such that anyone asking these questions could be referred there.
Must of missed that!

Ill go check it out

Thanks,
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Must of missed that!

Ill go check it out

Thanks,
Mike~
You'll notice I edited my original statement.. There are 3 basic ways for it... diode isolate which drops .7V, a relay which adds minimal for the resistance across the relay and just running a fused wire between them which is the least resistance of all. When you said 'resistance' my first thought was that you were talking about a diode system. I put most of it in the sticky, but if I were personally doing a dual battery setup, I'd either connect them directly and be sure I monitored voltage very often to be sure there were no problems or use a BIG HULKIN relay to bridge them.
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