12v deep cycle batteries to 24v??

[jsledder]

I need to hook 2 12v marine batteries together to get 24v. Is this done by hooking one negative post to the positive post on the opposing battery?

 

[LiveAlaska]

I need to hook 2 12v marine batteries together to get 24v. Is this done by hooking one negative post to the positive post on the opposing battery?

Yes!

 

[jsledder]

Now I'm not sure after reading this... (now after reading it again it makes sense, Series it is)

How to connect a battery in Series?
The positive terminal of the first battery is connected to the negative terminal of the second battery, the positive terminal of the second is connected to the negative of the third, etc. The voltage of the assembled battery is the sum of the battery voltages of the individual batteries. So the batteries are connected: + to - to + to - to + to -, etc. The capacity of the battery is unchanged.

How to connect a battery in Parallel?
The positive terminal of the first battery is connected to the positive terminal of the second battery, the positive terminal of the second is connected to the positive of the third, etc. and The negative terminal of the first battery is connected to the negative terminal of the second battery, the negative terminal of the second is connected to the negative of the third, etc. So the batteries are connected: + to + to + and - to - to -. In this configuration, the capacity is the sum of the capacities of the individual batteries and voltage is unchanged. For example, if you take 5 6V 10AH batteries and connect the batteries in series, you would end up with a battery array that is 30 Volts and 10AH. If you connect the batteries in parallel, you would end up with a battery array that is 6 Volts and 50AH. By the way, this is how ordinary auto batteries are made. 6 2volt cells are put in series to give 12v battery and the 6 cells are just enclosed in one case. Many ni-cad batteries are done the same way.

 

[jsledder]

What I'm doing is hooking up a 24v trolling motor in my boat that currently has a 12v with one battery. I've got another battery and plan on hooking that up by going from + to - between the 2. Now.... how do I hook up the motor to retrieve those 24v's? And, you say it's safe to hook up my 12v stuff to one of the batteries like I normally would? And, I have an onboard charger, do I hook that up to each battery like I normally would?

I feel like an idiot, but this stuff aint cheap and I'd rather not F it up. And there aint no boat shops in town either.

 

[mmsports]

12 and 24

Its simple Each battery is still just 12 V
Once you hook it up Positive to Neg The two terminals that do not have connectors to them are you 24 V and the you can still pull 12 of of any one of batteries. Just make sure they are Isolated no common ground.


Quot
I have an on board charger, do I hook that up to each battery like I normally would?Is it 12 V Yes but do not charge both at same time.


When in doubt use a volt tester

 

[ruffryder]

I would like to add, that for what ever battery is grounded to the chassis/frame, it would be wise to pull the 12 volt source if needed off of that battery. That way nobody will mistaken your ground wire as a true ground, since it will be +12 volts with respect to the real ground (the boat).

Just my thoughts.

Its simple Each battery is still just 12 V
Once you hook it up Positive to Neg The two terminals that do not have connectors to them are you 24 V and the you can still pull 12 of of any one of batteries. Just make sure they are Isolated no common ground.

Beat me to it, it seems.

 

[jsledder]

Thanks!!!

To my knowledge neither of the deep cycles are grounded to the boat anywhere. I should verify that 100% though?

 

[ruffryder]

Thanks!!!

To my knowledge neither of the deep cycles are grounded to the boat anywhere. I should verify that 100% though?

Good question. I assumed they do, but that might not be the case. I know they don't ground the fiberglass ones. ha ha

 

[LiveAlaska]

What I'm doing is hooking up a 24v trolling motor in my boat that currently has a 12v with one battery. I've got another battery and plan on hooking that up by going from + to - between the 2. Now.... how do I hook up the motor to retrieve those 24v's? And, you say it's safe to hook up my 12v stuff to one of the batteries like I normally would? And, I have an onboard charger, do I hook that up to each battery like I normally would?

I feel like an idiot, but this stuff aint cheap and I'd rather not F it up. And there aint no boat shops in town either.

What are you using for a charger?

 

[jsledder]

Dont remember the brand but it's a 2 bank onboard charger, has a red and black wire that you hook to each battery and it mounts on the floor and you just hook up an extension cord to it when they need charged.

I think I have this all figured out. I have 24v's going to the troller and 12v's at each battery for other stuff.

Thanks guys!!!!!