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01-04-2015, 10:01 PM
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#1
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Junior Member
Join Date: Jan 2014
Posts: 20
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Seeking battery bank wiring tips...
Hello, thank you for your time. I recently purchased (4) T-105's and am currently building my battery box and planning for wiring.
I have a fairly simple off-grid setup consisting of my solar charge controller, the 4 batteries (series/parallel), and inverter. I understand how to wire everything properly, but I am seeking advice to optimize the system.
Since I am still running as much as i can on the 12v system. Where is the best place to run the + wire that will lead to my DC fuse box? Off the same battery terminal I plan to use to wire my inverter? or just "daisy chain" off of the inverters + terminal? or off the fuse i plan to run between the bank and the inverter?
The same question kinda goes for the grounding wire to the RV frame. Is it better to just run 1 wire to the frame, and then also have your inverters DC negative input wire grounded to the frame? Or should you just run 2 wires off the same terminal? 1 leading to the RV frame and 1 leading to the inverter off the same terminal.
Finally, is it true you should place the (+/-) wires that are coming off your charge controller on the opposite end of your bank. ie; not on the same terminals as your output?
I hope I didn't lose anybody with lack of terminology and no diagrams.
Thanks again for your input.
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01-04-2015, 10:29 PM
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#2
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Community Moderator
Join Date: Sep 2011
Location: Between the Oceans
Posts: 8,026
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i am pretty sure some will provide answers on your questions.
here is my take:
1) put the fuse between terminal and inverter
2) two wires off the same neg terminal - one to frame one to inverter
3) yes technically you should place +/- wires of controller on the opposite terminals of the bank. i did this way.
i could be wrong though...
__________________
Steven & Polly
2000 Country Coach Intrigue 40' ISC 350
2018 Ford Explorer 4WD
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01-05-2015, 01:27 AM
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#3
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Junior Member
Join Date: Jan 2014
Posts: 20
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I decided to make a diagram with my two main questions.
I know there is no advantage "protection wise" in having the 2nd (+) line after the 250amp fuse, since the line is going directly into a DC Fuse box anyway. Perhaps less voltage drop only having one line off the battery terminal?
Also would those be the correct terminals for the solar?
Thanks again for your input!
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01-05-2015, 02:32 AM
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#4
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Senior Member
Join Date: Jul 2014
Posts: 35,348
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The solar looks wrong, but its early in the morning. Hook solar up to same + and - as inverter. You can use other + and- in center of picture. Your setup looks like you have 6 volt to solar. On fuses, you fuse to protect the wire from melting, so you should have a seperate, smaller fuse for house load.
Good luck
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01-05-2015, 03:12 AM
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#5
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Senior Member
Join Date: Jul 2014
Posts: 35,348
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Had coffee, nothing goes on the batt terminals that jump from plus to minus between 2, 6 volt batteries to make a 12 volt battery. Solar wires are wrong in you diagram.
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01-05-2015, 04:20 AM
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#6
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Senior Member
Join Date: Oct 2012
Location: Foley AL
Posts: 7,138
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Quote:
Originally Posted by twinboat
Had coffee, nothing goes on the batt terminals that jump from plus to minus between 2, 6 volt batteries to make a 12 volt battery. Solar wires are wrong in you diagram.
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Agree ... the solar connections shown would be the equivalent of both leads on either plus or minus (and not 1 plus and 1 minus.) Solar should be same as inverter connections.
As for the "splice", 2 wires on the battery post is ok or you could use a frame mounted stud for multiple wires.
__________________
2005 Newmar Essex 4502, 2013 Caddy SRX
1997 HR Endeavor 37, CAT, 1996 Geo Tracker
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01-05-2015, 12:43 PM
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#7
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Junior Member
Join Date: Jan 2014
Posts: 20
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Thanks for the replies!
Yes I can see on the diagram that the terminals are incorrect for the solar charge placement.
So I would put them on the "other terminals" in the middle? (representing the parallel connection)
Although my charge controller automatically equalizes my batteries once a month. I like the idea of having the input on different terminals then the draw, just in my head it sounds like it would keep the bank more equalized with the solar input load on different terminals then the output load.
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01-05-2015, 01:00 PM
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#8
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Senior Member
Join Date: Oct 2012
Location: Foley AL
Posts: 7,138
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Quote:
Originally Posted by crosby716
Thanks for the replies!
Yes I can see on the diagram that the terminals are incorrect for the solar charge placement.
So I would put them on the "other terminals" in the middle? (representing the parallel connection)
Although my charge controller automatically equalizes my batteries once a month. I like the idea of having the input on different terminals then the draw, just in my head it sounds like it would keep the bank more equalized with the solar input load on different terminals then the output load.
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Solar controller leads go the same place as the inverter cables. Electrically, it would be at the point of your blue arrows.
__________________
2005 Newmar Essex 4502, 2013 Caddy SRX
1997 HR Endeavor 37, CAT, 1996 Geo Tracker
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01-05-2015, 08:03 PM
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#9
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Community Moderator
Join Date: Sep 2011
Location: Between the Oceans
Posts: 8,026
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Quote:
Originally Posted by bruceisla
Solar controller leads go the same place as the inverter cables. Electrically, it would be at the point of your blue arrows.
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__________________
Steven & Polly
2000 Country Coach Intrigue 40' ISC 350
2018 Ford Explorer 4WD
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01-05-2015, 09:19 PM
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#10
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Senior Member
Join Date: Nov 2013
Location: Burien ,WA
Posts: 1,026
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I have my factory wiring diagrams on pdf if it would help. Different manufacture but still 4 bats with solar and inverters.
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