Go Back   TeamTalk > Maintenance Tips, How-tos and Refurbishing Topics > Electrical

Reply
 
Thread Tools Display Modes
  #1  
Old 12-12-2014, 11:38 AM
mcolinb mcolinb is offline
TT Regular
 
Join Date: Nov 2014
Boat: 05 XStar, 97 ProStar 205
Location: East Texas
Posts: 32
Charging Dual Battery System

So I just purchased a battery charger/maintainer. I plan on just plugging my boat in each time I pull into the boat house. Problem is, there's got to be a simple way to charge both batteries at the same time. Has someone done this who can shed some light? I've got dual batteries with the Perko switch.
Reply With Quote
  #2  
Old 12-12-2014, 11:49 AM
JRW160's Avatar
JRW160 JRW160 is offline
MC Devotee
 
Join Date: Mar 2008
Boat: 2003 X2
Location: Huntsville, AL
Posts: 1,302
If it's just a single bank charger just set the perko to all, and it will charge both batteries.
Reply With Quote
  #3  
Old 12-12-2014, 12:05 PM
CheeseSteak1's Avatar
CheeseSteak1 CheeseSteak1 is offline
TT Regular
 
Join Date: Oct 2014
Boat: 2003 X2 MCX
Location: Midwest
Posts: 51
I've been looking into on board chargers for the same reason. Check this out http://www.geniuschargers.com/GEN2
Reply With Quote
  #4  
Old 12-12-2014, 12:08 PM
mcolinb mcolinb is offline
TT Regular
 
Join Date: Nov 2014
Boat: 05 XStar, 97 ProStar 205
Location: East Texas
Posts: 32
Quote:
Originally Posted by JRW160 View Post
If it's just a single bank charger just set the perko to all, and it will charge both batteries.
I guess my main question would be where to attach the charger in order to charge both batteries? I just have it connected to my house battery right now.
Reply With Quote
  #5  
Old 12-12-2014, 12:10 PM
mcolinb mcolinb is offline
TT Regular
 
Join Date: Nov 2014
Boat: 05 XStar, 97 ProStar 205
Location: East Texas
Posts: 32
Quote:
Originally Posted by CheeseSteak1 View Post
I've been looking into on board chargers for the same reason. Check this out http://www.geniuschargers.com/GEN2
That's an awesome charger if I had that much money to invest in a charger!
Reply With Quote
  #6  
Old 12-12-2014, 12:48 PM
MLA MLA is offline
TT Enthusiast
 
Join Date: May 2012
Boat: pontoon
Location: Lake Wylie Area
Posts: 428
I would connect it directly to the battery. As asked, is it just a single bank charger? If its a 2-bank on-board marine charger, then it would have 2 sets of leads, one for each bank.
Reply With Quote
  #7  
Old 12-12-2014, 12:55 PM
joshbw joshbw is online now
TT Newbie
 
Join Date: Aug 2014
Boat: 2011, x45, 6.2L
Location: Southwest
Posts: 2
Try the Genmini2, you don't need 10A per battery for a maintenance. I have the Genmini2 on my MC and it works great, install was simple just connect to both batteries directly. I have the Gen2 3 bank on my fishing boat and it has worked flawlessly as well. I leave it plugged in all the time and have never had to add water in over a year. These are much better than the junk at bass pro or cabelas. Very happy.

I liked their products so much I bought gb30 jump starter as well. Only tried it to jump a Ford ranger but it worked with a completely dead battery. Very handy, they make awesome stuff.
Reply With Quote
  #8  
Old 12-12-2014, 01:06 PM
Thrall's Avatar
Thrall Thrall is offline
MC Maniac
 
Join Date: Jul 2004
Boat: '06 X2 MCX
Location: Eagle River, AK!
Posts: 3,850
I have dual batteries and a single bank charger. Batteries linked by an ACR (automatic perko switch) for charging only. The batteries discharge to separate components. House battery runs the stereo only and start battery runs every ting else. That way the amps can never kill the start battery.
I hooked the charger right to the starter motor and it back feeds to both batteries thru the start battery and ACR to the house battery. Works great. I have a5 and 6 yr old batteries that I pulled from the boat and put in the truck a couple years ago still going strong.
Theoretically charging both batteries off a single bank charger can overcharge 1 battery while trying to top off the one that is lower on charge since it is sending the same amps to both and only does into float mode once it senses high enough stored voltage but I've found it doesn't appear to hurt my AGM batteries judging by how long they've lasted.
Plus it was more convienent and less clutter to put the charger in the engine compartment in my case.
__________________
'06 X2 MCX

"I understand why some people may not want to do this the way I have recommended but I can't understand the death grip some people have on a toilet plunger with a hose fitting." -JimN
Reply With Quote
  #9  
Old 12-12-2014, 01:33 PM
GoneBoatN's Avatar
GoneBoatN GoneBoatN is online now
MC Devotee
 
Join Date: Oct 2010
Boat: 2010 X-15 w/MCX
Location: Nor Cal
Posts: 2,025
Quote:
Originally Posted by mcolinb View Post
So I just purchased a battery charger/maintainer. I plan on just plugging my boat in each time I pull into the boat house. Problem is, there's got to be a simple way to charge both batteries at the same time. Has someone done this who can shed some light? I've got dual batteries with the Perko switch.
A lot depends upon your wiring/setup, what you want to achieve and what you have for a charger.

So, for example, if you have an Automatic Charging Relay (ACR) it only combines the two when your batteries are at peak voltage. In addition with the master switch off, the batteries are isolated. So you would need dual leads to charge both batteries when the switch is off.

The wires on your charger are most likely of a gauge that requires a short distance connection. So connecting anywhere but directly to the battery may be a bad idea.

While you could devise a split lead from the charger to the batteries, effectively you are combining the batteries resulting in a higher amperage. Now you will need a higher amperage to effectively charge. To low of an amperage on say something like a maintainer designed for a single battery may very well not be enough to even maintain the two batteries. If you use one of these "battery tenders" the easiest and least expensive route may be to just buy two.

Notice that I spoke in generalities above. Because so much depends on the details: amps of batteries, amps of your charger...

If it were me, I would consider investing a few dollars into a 3-stage dual battery charger. Look at ProMariner or Guest. I have a Guest installed in the boat next to the batteries. Marine batteries cost $$$. Investing $$ on a good 3-stage charger is a good long term investment.
__________________
I love to travel, but hate to arrive. ~~ A. Einstein
-----
You donít stop riding because youíre getting old, but you get old when you stop riding.
-----
Life should not be a journey to the grave with the intention of arriving safely in a pretty and well preserved body, but rather to skid in broadside, in a cloud of smoke, thoroughly used up, totally worn out, and loudly proclaiming, Wow! What a Ride! ~~ Hunter S. Thompson
-----
My wakeboard is calling, and I must go ride! ~~ Me
Reply With Quote
  #10  
Old 12-12-2014, 01:43 PM
joshbw joshbw is online now
TT Newbie
 
Join Date: Aug 2014
Boat: 2011, x45, 6.2L
Location: Southwest
Posts: 2
If the batteries are the same size and about the same age you should be OK with one charger, if they are different sizes I would be more concerned like Thrall mentioned about topping them off evenly. You best bet is still one charger per battery so each can be analyzed and charged independently even though it's probably overkill. Golf carts, RVs, manlifts, etc charge multiple batteries on one charger all the time though...so you will be ok.
Reply With Quote
Reply

Thread Tools
Display Modes

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


All times are GMT -4. The time now is 08:16 AM.