golf cart battery installation - SailNet Community

   Search Sailnet:

 forums  store  


Quick Menu
Forums           
Articles          
Galleries        
Boat Reviews  
Classifieds     
Search SailNet 
Boat Search (new)

Shop the
SailNet Store
Anchor Locker
Boatbuilding & Repair
Charts
Clothing
Electrical
Electronics
Engine
Hatches and Portlights
Interior And Galley
Maintenance
Marine Electronics
Navigation
Other Items
Plumbing and Pumps
Rigging
Safety
Sailing Hardware
Trailer & Watersports
Clearance Items

Advertise Here






Go Back   SailNet Community > On Board > Gear & Maintenance > Electrical Systems
 Not a Member? 


Like Tree2Likes
Reply
 
LinkBack Thread Tools
  #1  
Old 04-29-2014
Senior Member
 
Join Date: Jan 2010
Location: Boston, MA
Posts: 525
Thanks: 2
Thanked 1 Time in 1 Post
Rep Power: 5
rmeador is on a distinguished road
golf cart battery installation

After reading all the excellent advice in my previous thread (would you buy used AGMs?), I've opted to buy four new flooded golf cart batteries rather than the questionable AGMs I was asking about before. They're about the same price -- I got the GC115's from BatteriesPlus; with a quantity 4 discount they're $100/ea. My research suggests these are relabled Deka GC15s, and the BatteriesPlus rep confirmed this. They had a better Ah/$ rating than any other size I looked at, including the GC25.

So now comes the question of how do I install them. I bought four single-battery boxes from Defender, so I think physical installation is handled, but I'm wondering about electrical. My existing system is two "banks" of one Group 27 each, wired to a 1-2-both-off switch (separate positive and negative cable for each). I do not have a separate starting battery nor do I have space for one. I have never treated these banks as separate, the switch is always either off or both. Thus I intend to wire them as a single bank. It will also ease installation of my new battery monitor (Victron BMV-700, to better obsess over my new batteries, of course), which wants a shunt in the negative lead to the bank. Does this seem like a good idea?

I'm thinking jumpers between two sets of two batteries to make them 12V, then jumpers between the 12Vs and grounds, respectively, to form them into a single bank. I'll then connect my two positive leads to the combiner switch to one "corner" of the bank, and the two negatives to the other corner. What size wire should I use for the jumpers? My system is a mix of 1/0 (or maybe 2/0) cables to the bank plus 4/0 from the combiner to the inverter/charger. I'm thinking the jumpers should be 1/0 or 2/0 but I'm not sure which. They'll be very short, probably only about a foot.

Thanks!
__________________
1979 Gulfstar 37 Laissez Faire
Reply With Quote Share with Facebook
  #2  
Old 04-29-2014
just ducky
 
Join Date: Aug 2008
Location: NH
Posts: 818
Thanks: 4
Thanked 18 Times in 17 Posts
Rep Power: 7
Don0190 is on a distinguished road
Re: golf cart battery installation

I wired my 4 6V batteries into 2 banks because that is the way my boat was already wired. I don't have a 1,2, both switch like lots of boast and instead have a sepaerate breaker from each bank to the main DC panel. I also have another switch that selects which bank (1,2, or both) supplies the inverter and that same switch determines which bank charges from the alternator.

I normally run with both banks supplying the main DC panel and the inverter switch in both.

I have a Victron BM and all ground legs go though it before branching out to the 2 battery banks. The BM is programed for the total house battery capacity as that is what it is far as the BM cares. If I were to have to take out a bank all I would need to do is change the capacity volume in the BM.
__________________
Don't blow air up my rear, be useful and blow it at the sails!
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
Reply With Quote Share with Facebook
  #3  
Old 04-29-2014
Maine Sail's Avatar
Senior Member
 
Join Date: Jan 2003
Location: Maine Coast
Posts: 5,367
Thanks: 11
Thanked 122 Times in 90 Posts
Rep Power: 15
Maine Sail is just really nice Maine Sail is just really nice Maine Sail is just really nice Maine Sail is just really nice
Re: golf cart battery installation

Quote:
Originally Posted by rmeador View Post

So now comes the question of how do I install them. I bought four single-battery boxes from Defender, so I think physical installation is handled, but I'm wondering about electrical. My existing system is two "banks" of one Group 27 each, wired to a 1-2-both-off switch (separate positive and negative cable for each). I do not have a separate starting battery nor do I have space for one. I have never treated these banks as separate, the switch is always either off or both. Thus I intend to wire them as a single bank. It will also ease installation of my new battery monitor (Victron BMV-700, to better obsess over my new batteries, of course), which wants a shunt in the negative lead to the bank. Does this seem like a good idea?
Definitely wire them as one contiguous bank if you are using a shunt based battery monitor.. One large bank is also more efficient than two smaller banks.. It is easy enough for a battery monitor to get out of synch wiring two banks and using them as one via a switch will only lead to more eventual human errors and thus counting errors...

Quote:
Originally Posted by rmeador View Post
I'm thinking jumpers between two sets of two batteries to make them 12V, then jumpers between the 12Vs and grounds, respectively, to form them into a single bank. I'll then connect my two positive leads to the combiner switch to one "corner" of the bank, and the two negatives to the other corner. What size wire should I use for the jumpers? My system is a mix of 1/0 (or maybe 2/0) cables to the bank plus 4/0 from the combiner to the inverter/charger. I'm thinking the jumpers should be 1/0 or 2/0 but I'm not sure which. They'll be very short, probably only about a foot.

Thanks!
If you have 2/0 use that, 1/0 would work...


One way:


Same wiring just all batts in one box before it was epoxied.
__________________
______
-Maine Sail / CS-36T


To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.




© Images In Posts Property of Compass Marine Inc.


Reply With Quote Share with Facebook
  #4  
Old 04-30-2014
Senior Member
 
Join Date: Jan 2010
Location: Boston, MA
Posts: 525
Thanks: 2
Thanked 1 Time in 1 Post
Rep Power: 5
rmeador is on a distinguished road
Re: golf cart battery installation

Thanks for the recommendations. I think I'll make a single bank using 2/0. Maine Sail, that's a beautiful wiring job in the top photo
__________________
1979 Gulfstar 37 Laissez Faire
Reply With Quote Share with Facebook
  #5  
Old 04-30-2014
hellosailor's Avatar
Plausible Deniability
 
Join Date: Apr 2006
Posts: 10,660
Thanks: 2
Thanked 93 Times in 91 Posts
Rep Power: 10
hellosailor has a spectacular aura about hellosailor has a spectacular aura about
Re: golf cart battery installation

rm-
The quality of the crimps on the cable lugs is important, and making a good crimp can require an expensive tool. So if you weren't already set up for this, consider ordering the cables from genuinedealz.com, who will sell you marine grade cable with proper crimps installed, to order, for about the same thing you'd pay for the cable and fittings locally.

Some cheap rope cut up, or a tape measure, will make sure the lengths are right when you order. And of course, provide for proper primary fusing right on the battery bank at the same time.
Reply With Quote Share with Facebook
  #6  
Old 04-30-2014
Senior Member
 
Join Date: Jan 2010
Location: Boston, MA
Posts: 525
Thanks: 2
Thanked 1 Time in 1 Post
Rep Power: 5
rmeador is on a distinguished road
Re: golf cart battery installation

hellosailor, that's a good point. I was already planning on getting the cables from genuinedealz; I've always been very impressed with their service and prices. I hadn't really given thought to fusing the batteries. I see genuinedealz sells some battery terminal fuses that look like they'd work, but I don't see the blocks they're supposed to go with. Is there a particular fuse arrangement you'd recommend?
__________________
1979 Gulfstar 37 Laissez Faire
Reply With Quote Share with Facebook
  #7  
Old 04-30-2014
hellosailor's Avatar
Plausible Deniability
 
Join Date: Apr 2006
Posts: 10,660
Thanks: 2
Thanked 93 Times in 91 Posts
Rep Power: 10
hellosailor has a spectacular aura about hellosailor has a spectacular aura about
Re: golf cart battery installation

Ask me first for a religion, or a wife.(G)

Mainesail found a number of no-name ANLs to be less than expected, so you might go to BlueSeas and check out what options they offer in the capacity you want and then consider if you want to may gen-you-whine prices, or explore options. And of course, get a couple of spares in case someone drops a wrench.
Reply With Quote Share with Facebook
  #8  
Old 04-30-2014
mitiempo's Avatar
Senior Member
 
Join Date: Sep 2008
Location: Victoria B.C. Canada
Posts: 7,125
Thanks: 0
Thanked 71 Times in 62 Posts
Rep Power: 8
mitiempo will become famous soon enough mitiempo will become famous soon enough
Re: golf cart battery installation

The easiest way to fuse the batteries is with Blue Seas MRBF fuses right on the posts. Gets the fuse as close as possible and eliminates the jumper required to a conventional fuse.

How-to here: Battery Bank Fusing Photo Gallery by Compass Marine How To at pbase.com

MRBF Terminal Fuse Block - 30 to 300A - Blue Sea Systems
deniseO30 likes this.
__________________
Brian
Living aboard in Victoria Harbour
Reply With Quote Share with Facebook
  #9  
Old 04-30-2014
deniseO30's Avatar
Move over Joan Rivers!
 
Join Date: Nov 2006
Location: Bristol pa
Posts: 6,152
Thanks: 52
Thanked 91 Times in 81 Posts
Rep Power: 9
deniseO30 will become famous soon enough deniseO30 will become famous soon enough
Re: golf cart battery installation

I'm in the midst of rewiring my battery systems and heartily agree with using these.
Battery Bank Fusing Photo Gallery by Compass Marine How To at pbase.com

__________________
Denise, Bristol PA, Oday 30. On Tidal Delaware River, Anchor Yacht Club. New Website!
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.

My boat is for sale.
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
Reply With Quote Share with Facebook
  #10  
Old 04-30-2014
Senior Member
 
Join Date: Jan 2010
Location: Boston, MA
Posts: 525
Thanks: 2
Thanked 1 Time in 1 Post
Rep Power: 5
rmeador is on a distinguished road
Re: golf cart battery installation

Excellent link, as Maine Sail's articles always are One thing neither it nor the posts thus far have addressed, to my reading, is where to fuse: does each battery in the bank get a fuse, or each 12V series pair, or just one for where the bank connects to the house wiring?
__________________
1979 Gulfstar 37 Laissez Faire
Reply With Quote Share with Facebook
Reply


Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools

 
Posting Rules
You may post new threads
You may post replies
You may post attachments
You may edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is On


Similar Threads
Thread Thread Starter Forum Replies Last Post
Golf Cart Batteries cb32863 Electrical Systems 21 11-26-2011 09:54 PM
Battery box for two golf cart batteries prroots Electrical Systems 18 02-10-2011 06:10 AM
battery box for golf cart batteries newcruiserP10M Gear & Maintenance 3 09-26-2010 10:54 AM
Considering going to golf cart batteries oomfh Gear & Maintenance 10 07-28-2010 02:46 PM
Golf cart batteries hathanger Gear & Maintenance 8 03-13-2005 03:23 PM


All times are GMT -4. The time now is 09:42 PM.

Add to My Yahoo!         
Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2014, vBulletin Solutions, Inc.
SEO by vBSEO 3.6.1
(c) Marine.com LLC 2000-2012

The SailNet.com store is owned and operated by a company independent of the SailNet.com forum. You are now leaving the SailNet forum. Click OK to continue or Cancel to return to the SailNet forum.