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12-11-2014, 08:49 AM
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#1
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Member
Join Date: Sep 2014
Posts: 38
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Battery shut off switch.
I've been researching the electrical systems in my 27HFS and am wondering how much voltage I'm loosing with the 15 plus feet of wire used to hook up the battery shut off switch.
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12-11-2014, 09:04 AM
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#2
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Phat Phrog Stunt Team
Join Date: Aug 2011
Location: Iowa
Posts: 34,507
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Quote:
Originally Posted by rsv4pilot
I've been researching the electrical systems in my 27HFS and am wondering how much voltage I'm loosing with the 15 plus feet of wire used to hook up the battery shut off switch.
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Why do you need 15 plus foot?
Mount the shut off right at the battery.
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12-11-2014, 09:04 AM
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#3
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Member
Join Date: Sep 2014
Posts: 38
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That's just how THEY have it wired.
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12-11-2014, 09:06 AM
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#4
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Phat Phrog Stunt Team
Join Date: Aug 2011
Location: Iowa
Posts: 34,507
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Quote:
Originally Posted by rsv4pilot
That's just how THEY have it wired.
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I guess I'm not following?
You currently do not have a cut off correct?
Are wanting to use the hot wire that goes from battery to the converter?
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12-11-2014, 09:07 AM
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#5
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Member
Join Date: Sep 2014
Posts: 38
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I currently have a factory installed shut off in the middle of the RV.
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12-11-2014, 09:10 AM
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#6
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Phat Phrog Stunt Team
Join Date: Aug 2011
Location: Iowa
Posts: 34,507
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Quote:
Originally Posted by rsv4pilot
I currently have a factory installed shut off in the middle of the RV.
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The wires have to run to your converter anyway and there putting the cut off inline of those wires for convenience and no "extra" wire is being used.
Am I making sense? Lol
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12-11-2014, 09:13 AM
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#7
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Phat Phrog Stunt Team
Join Date: Aug 2011
Location: Iowa
Posts: 34,507
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Simply
Hot wire from battery to cut off.
Hot wire from cut off to converter.
Your converter is close to your cut off correct?
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12-11-2014, 09:15 AM
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#8
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Member
Join Date: Aug 2011
Location: Oklahoma
Posts: 62
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I also have a factory installed battery disconnect switch at the end of my trailer. It is as far away from the battery as you can get. I really don't understand the purpose. He said it was to keep the battery from draining when not in use but we have always just disconnected the actual battery to keep that from happening. I guess it is the same thing???
__________________
Steve and Brandi & our "Pit" crew Bella
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12-11-2014, 09:32 AM
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#9
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Phat Phrog Stunt Team
Join Date: Aug 2011
Location: Iowa
Posts: 34,507
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Normally the cut off is near the converter.
The battery wires have to run from battery to the converter anyway so they put the cut off inline "inside" for convenience.
They don't run "extra" wire to cut off from the battery then back to battery.
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12-11-2014, 11:51 AM
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#10
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Member
Join Date: Sep 2014
Posts: 38
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Ill look at it closer but mine definitely has extra wire, it's not, physically, inline at all. Wire from front of trailer half way back to cut off then another wire all the way back to the front of the trailer.
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12-11-2014, 11:53 AM
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#11
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Phat Phrog Stunt Team
Join Date: Aug 2011
Location: Iowa
Posts: 34,507
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Quote:
Originally Posted by rsv4pilot
Ill look at it closer but mine definitely has extra wire, it's not, physically, inline at all. Wire from front of trailer half way back to cut off then another wire all the way back to the front of the trailer.
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It has to be or should be inline or that defeats the purpose
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12-11-2014, 12:03 PM
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#12
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Phat Phrog Stunt Team
Join Date: Aug 2011
Location: Iowa
Posts: 34,507
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I'm definitely curious how they wired it.
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12-11-2014, 12:35 PM
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#13
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Member
Join Date: Oct 2014
Posts: 97
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15' of 8-10ga wire is going to have negligible line loss on a 12vdc system, I wouldn't give it a second thought. A single crimp connection, even one done properly, offers more resistance than a 15 foot section of copper wire.
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12-11-2014, 01:10 PM
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#14
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Member
Join Date: Sep 2014
Posts: 38
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Kinda what I thought. Thanks mike.
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12-11-2014, 01:17 PM
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#15
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Senior Member
Join Date: Oct 2014
Posts: 231
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Not so fast, that depends on what load you are running. If you still have all of your original incandescent lights you'll have a big load. Just 12 of them (6 double fixtures) on at one time is 18 amps, and over 15 feet of 10 gauge wire that's a 5.6% voltage drop - which is too much. Even if you only run 6 bulbs, if you add on a fan and/or water pump you'll be back into high-amp territory.
__________________
2008 FR Salem 26TBUD
2010 FR R-Pod 171 (2009-2015)
2010 Chevy Suburban
Honda EU3000is inverter-generator
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12-11-2014, 09:09 PM
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#16
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Junior Member
Join Date: Feb 2013
Posts: 12
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My 06 FR Sierra Sport 5ver did not have a disconnect switch so I placed it right above the battery on the ground wire and solved my dead battery issue.
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12-12-2014, 01:18 PM
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#17
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Senior Member
Join Date: Oct 2014
Posts: 231
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Quote:
Originally Posted by jim-bob
My 06 FR Sierra Sport 5ver did not have a disconnect switch so I placed it right above the battery on the ground wire and solved my dead battery issue.
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It is safer to put the disconnect on the positive side, since the frame is negative. Putting the disconnect on the negative side leaves the positive run to the converter, live. Not an issue for phantom loads, just safety.
__________________
2008 FR Salem 26TBUD
2010 FR R-Pod 171 (2009-2015)
2010 Chevy Suburban
Honda EU3000is inverter-generator
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12-12-2014, 01:53 PM
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#18
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Senior Member
Join Date: Feb 2012
Posts: 1,102
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How did you come up with 5.6%?
What ohms per foot are you using?
The online calculator came up with .015 ohms for 15 feet.
.015 X 18 = .27V drop
0.27V of 12V is 2.25%
__________________
 Ontario
Current: 2019 Sunseeker 2290S
Previous (2012-2016): 2012 Vibe 6501
1 Prospector Canoe, 2 Mtn. Bikes & 4 Hiking Boots
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12-12-2014, 02:46 PM
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#19
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Senior Member
Join Date: Oct 2014
Posts: 231
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I've always used this one: Voltage Drop Calculator - for single and 3 phase ac systems and dc systems
You are forgetting to double the resistance since the run is to the load and back. So 30 feet of wire.
__________________
2008 FR Salem 26TBUD
2010 FR R-Pod 171 (2009-2015)
2010 Chevy Suburban
Honda EU3000is inverter-generator
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12-12-2014, 03:39 PM
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#20
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Senior Member
Join Date: Feb 2012
Posts: 1,102
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He said there was 15 feet of wire not that the switch was 15 feet from the battery.
__________________
Ontario
Current: 2019 Sunseeker 2290S
Previous (2012-2016): 2012 Vibe 6501
1 Prospector Canoe, 2 Mtn. Bikes & 4 Hiking Boots
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