Notices

Adding an additional house battery Bank

Old 07-30-2013, 12:51 PM
  #1  
Senior Member
Thread Starter
 
Join Date: Jun 2009
Location: Miami, fl
Posts: 412
Default Adding an additional house battery Bank

So, my new boat needs quite a bit of juice.

The boat currently has one dedicated house battery in the console. There is no space for another in that area. I have space for additional batteries under the helm. I am thinking of adding two more batteries. Can I just wire these in parallel? How should they be wired.

The current house battery is connected to a battery charger as well. Here is a picture of the console battery set up.

Let me know what you guys think:

Name:  2.5 console electrical.jpg
Views: 1802
Size:  82.4 KB
gaa07 is offline  
Old 07-30-2013, 01:00 PM
  #2  
Senior MemberCaptains Club Member
 
Join Date: Feb 2005
Location:
Posts: 13,053
Default

Adding additional batteries in parallel will increase the number of amps that are available.

Once the batteries are wired in parallel the on board battery charger will charge all of them. How long it will take to recharge/top them off is a function of the capacity of the batteries, their state of discharge and the output of the charger.

Last edited by jethro1; 07-30-2013 at 05:25 PM.
jethro1 is offline  
Old 07-30-2013, 01:21 PM
  #3  
Senior MemberCaptains Club Member
 
Join Date: Dec 2007
Location: PBG, FL
Posts: 8,933
Default

sounds good to me.
bradv is offline  
Old 07-30-2013, 01:28 PM
  #4  
Senior Member
Thread Starter
 
Join Date: Jun 2009
Location: Miami, fl
Posts: 412
Default

The onboard charger will charge the batteries that are in parallel even if not directly connected to those batteries?

Is their a specific battery tray or holder you would recommend for the installation in the new location?

Thank you for the responses, you guys are great!

- Guillermo
gaa07 is offline  
Old 07-30-2013, 01:35 PM
  #5  
Senior Member
 
Join Date: Mar 2010
Location: Orlando, FL
Posts: 1,384
Default

You might want to think of things a little differently.

1 Engine battery per engine = 3 start batteries.
If you only have room for 2 more batteries, keep them separate, do not parallel them. Run VSR/ACR from each engine battery to the house battery. One engine battery to vsr to one house. The other 2 engine batteries to 2 vsr to the other house. Put your inverter and stereo on one house battery. Put one VHF on that house battery. Put all your other electronics, lighting, VHF on the other house battery. Add a parallel switch (On - Off) to combine your batteries to each other (house to house) or house to one engine start battery. Because you have such high draw equipment, you dont want to parallel your house batteries, as you may draw it down faster than you think and some of your required items on the house battery may then not work. If you have room for a 6th battery, then yes, make one of the house batteries a dual/parallel house battery setup. Hope that makes sense. I run 6 AGM batteries in my fountain for this reason, with crossing VSRs and 2 separate charging systems.
SaltyG is offline  
Old 07-30-2013, 01:41 PM
  #6  
Senior Member
Thread Starter
 
Join Date: Jun 2009
Location: Miami, fl
Posts: 412
Default

Salty,

Thank you for the response although a little techy for my simple knowledge

In the helm are I have space for 4 more batteries if I wanted.

The boat has 2 engines, each one with its own battery.

The factory has already wired all the electronics to one house battery. I did not want to mess around with the wiring and just wanted to add more power. I wanted to go with the simplest and most effective method as I did not want to move around more wiring than need be.

What are your thoughts?
gaa07 is offline  
Old 07-30-2013, 01:48 PM
  #7  
Junior Member
 
Join Date: Aug 2008
Location: Jackson, MS
Posts: 14
Default

Originally Posted by gaa07 View Post
Salty,

Thank you for the response although a little techy for my simple knowledge

In the helm are I have space for 4 more batteries if I wanted.

The boat has 2 engines, each one with its own battery.

The factory has already wired all the electronics to one house battery. I did not want to mess around with the wiring and just wanted to add more power. I wanted to go with the simplest and most effective method as I did not want to move around more wiring than need be.

What are your thoughts?
+1

I have the same question. Mine is already wired from the factory with 2 cranking batteries: 1 for each motor. I have one house battery that runs all the electronics. I would like to add one more house battery to the existing house battery by running them parallel. My boat is set up with a charger as well. Thanks in advance.
smm3 is offline  
Old 07-30-2013, 04:21 PM
  #8  
Senior Member
 
Join Date: Mar 2010
Location: Orlando, FL
Posts: 1,384
Default

Hi Gaa07-
Ok, so you currently have a total of 3 batteries installed. 2 engines and 1 house.

1) make sure that the current house battery can be charged automatically from both engines. This means you should add 2 VSR devices. One from each engine battery to the same house battery. This gives you maximum charging capabilities off the engine.

2) to keep things as simple as possible (YOUR CURRENT PLAN), next you could add just one more battery and make it a house battery and put it in parallel with your existing house battery. This would double your run time and is simple. However, I looked at everything you are adding and if you cranked your stereo or really used your inverter, you could drain both house batteries together. This is the minimum that I would do, add a parallel house battery.

3) If you don't mind a little more complexity...and just my opinion only, ask others, instead of adding another house battery in parallel (which works fine if you have light loads - but since you have some high load devices), I would add another house battery, but instead of putting it as a parallel battery, I would make it a separate house battery. And then, yes, you will need to ask the factory to spilt the electronics between each battery. Basically balance your load between the house batteries, so that if you draw 1 house battery down, you still have one more. If you have 2 VHF radios, put one radio on each house battery. Gives you redundancy.

4) I would probably stop at #3 above. But if money and complexities are no problem and you said you had room for more batteries, I would add one more house battery (3rd house) and put that in parallel with whatever house battery you have the inverter connected to. Probably no need to go this far, but it gives you more reserve for the inverter.

5) If you just stop at #2 above, 1 more battery in parallel, then the VSRs you installed in #1 still work just fine.

6) If you go to step #3, you use the same number of VSRs, just connect 1 engine battery to 1 house battery via the first VSR and connect the other engine battery to the other house battery via the second VSR

Hope this helps some. Sorry it is confusing. There are lots of valid ways to do battery management correctly and even many more ways to do it wrong.
SaltyG is offline  
Old 07-30-2013, 04:34 PM
  #9  
Senior Member
 
Join Date: Mar 2010
Location: Orlando, FL
Posts: 1,384
Default

To smm3,

Your approach of adding just another house battery in parallel is a great approach and probably all that you need to do. Just make sure you don't have some big load that could really draw down your house batteries. If you don't have big stereo amps or big inverters, then adding a parallel house battery is simple and a good thing to do. If you have several high draw items, like lots of stereo amps, inverters or others, then adding a battery in parallel buys you a little more time, but not a lot of time. Then, with all of your electronics hooked to just your parallel house batteries, when they are dead, they are both dead and you have no electronics working. If you split your electronics between 2 separate house batteries and put your big loads, like stereo amps on one battery and your navigation electronics and VHF on the other battery, then if you run down your stereo battery, you still have all electronics and VHF radio.

So, in my opinion only, if you have "normal" drawing loads, putting two house batteries together in parallel mode is simple and works fine.

If you have some high draw loads, I dont like to combine my house batteries, as it may drain both, then you have no electronics. I like to split my electronics between separate house batteries.

Hope that makes sense. Just depends on what all electronics you have.
SaltyG is offline  
Old 07-30-2013, 05:30 PM
  #10  
Senior MemberCaptains Club Member
 
Join Date: Feb 2005
Location:
Posts: 13,053
Default

Originally Posted by gaa07 View Post
The onboard charger will charge the batteries that are in parallel even if not directly connected to those batteries?

Is their a specific battery tray or holder you would recommend for the installation in the new location?

Thank you for the responses, you guys are great!

- Guillermo
If the to-be-added batteries are wired in parallel with the existing house battery they are directly connected to each other.

However it is that your house battery is being charged today, either by the engines or the onboard charger, the additional batteries will be charged the same.

You said you need more juice. Adding more batteries in parallel is doing just that. If you add two more batteries that are the same size as the current house battery, you will have tripled the amount of juice that is available.

Let's say that I have a five gallon bucket of water. I need more water. I can either buy a fifteen gallon bucket of water to replace the five gallon bucket of water or I can buy two more five gallon buckets of water. Three times five gallons equals 15 gallons as you know.
jethro1 is offline  
Old 07-30-2013, 06:28 PM
  #11  
Senior Member
Thread Starter
 
Join Date: Jun 2009
Location: Miami, fl
Posts: 412
Default

Anf this ladies and gentlemen is why I love THT

Thank you Salty and Jethro!

Learned alot here. Will talk to my electrician when the boat gets down here (next week) and see what he can do. I do like the idea of seperating the inverter and stereo to another battery!

I will keep you guys up to date on what happens.

I will definitely be investing in a voltage meter such as the Newmar DCE to monitor my consumption better.
gaa07 is offline  
Old 07-30-2013, 06:59 PM
  #12  
Senior Member
 
Join Date: Mar 2010
Location: Orlando, FL
Posts: 1,384
Default

Your welcome!

And consider this meter from Blue Sea: http://www.bluesea.com/products/8248...ter_with_Alarm

It monitors AMPS and Voltage. It actually shows you real time, what you are drawing out of the batteries and as you start to charge the batteries, how much current you are putting back into the batteries.
SaltyG is offline  
Old 07-30-2013, 07:45 PM
  #13  
Senior Member
Thread Starter
 
Join Date: Jun 2009
Location: Miami, fl
Posts: 412
Default

salty,

Where did you put that meter on your boat?

I am trying to figure out where I can put it. I would of course prefer it to be on the console so as to have it readily visible, not sure if I have the space the on the console.
gaa07 is offline  
Old 07-30-2013, 07:53 PM
  #14  
Senior Member
 
Join Date: Mar 2010
Location: Orlando, FL
Posts: 1,384
Default

I put two of those meters, to monitor the house batteries, on the port wall, right next to the console. See the picture below. They are the 2 little boxes on the side wall, right below the satellite phone and internet connection.

SaltyG is offline  
Old 07-30-2013, 07:56 PM
  #15  
Senior Member
Thread Starter
 
Join Date: Jun 2009
Location: Miami, fl
Posts: 412
Default

nice, they do not seem to be to big either. Thank you again Sir!
gaa07 is offline  
Old 07-31-2013, 08:44 PM
  #16  
Senior Member
 
Join Date: Jun 2009
Location: South Carolina's Lowcountry
Posts: 252
Default

I would not parallel two batteries except in an emergency - if you get a bad cell in one it will pull the other one down.

If your electronics can take 24VDC (which most can), consider wiring them in series - you will still get twice the juice with half the current and half the voltage drop from long runs.
Rubberhead is offline  
Old 07-31-2013, 09:02 PM
  #17  
Admirals Club Admiral's Club Member
 
Join Date: Mar 2011
Location: Canada
Posts: 2,773
Default

most things don't take 24v...
smac999 is online now  
Old 07-31-2013, 09:11 PM
  #18  
Senior Member
 
Join Date: Mar 2010
Location: Orlando, FL
Posts: 1,384
Default

smac999 is correct, many of the marine electronics will shut off at 15volts or actually burn something up. So don't connect 2 batteries in series. That will not work well.
SaltyG is offline  
Old 08-01-2013, 06:45 AM
  #19  
Senior MemberCaptains Club Member
 
Join Date: Feb 2005
Location:
Posts: 13,053
Default

Originally Posted by Rubberhead View Post
I would not parallel two batteries except in an emergency - if you get a bad cell in one it will pull the other one down.

If your electronics can take 24VDC (which most can), consider wiring them in series - you will still get twice the juice with half the current and half the voltage drop from long runs.

A battery is comprised of six cells. In series of course.

We seldom hear of a cell failing and taking a battery out. But, it does happen.

The probability of one battery, in parallel with others, failing is very remote. If more current is needed, and one either does not have room for a larger single battery, then the only option may be to parallel batteries.

This is a common and accepted practice.
jethro1 is offline  
Old 08-01-2013, 08:18 AM
  #20  
Senior MemberCaptains Club Member
 
Join Date: Jan 2007
Location: Beaufort, SC
Posts: 568
Default

Keep in mind that the added house battery(ies) no matter how they are connected, will only extend house electrical running time while the engine(s) are OFF.

If you are running out of house power while the engine(s) are running adding more battery capacity will not help, you would need to install larger alternator(s).
yandina is offline  

Thread Tools
Search this Thread