RV.Net Open Roads Forum: Tech Issues: Cable length for Solar

RV Blog

  |  

RV Sales

  |  

Campgrounds

  |  

RV Parks

  |  

RV Club

  |  

RV Buyers Guide

  |  

Roadside Assistance

  |  

Extended Service Plan

  |  

RV Travel Assistance

  |  

RV Credit Card

  |  

RV Loans

Open Roads Forum Already a member? Login here.   If not, Register Today!  |  Help

Newest  |  Active  |  Popular  |  RVing FAQ Forum Rules  |  Forum Help and Support  |  Contact

Search:   Advanced Search

Search only in Tech Issues

Open Roads Forum  >  Tech Issues

 > Cable length for Solar

This Topic Is Closed  |  Print Topic  |  Post New Topic  | 
Page of 2  
Next
Sponsored By:
Crazy Ray

Monroe,La

Senior Member

Joined: 01/17/2006

View Profile



Good Sam RV Club Member

Offline
Posted: 02/23/12 12:12pm Link  |  Print  |  Notify Moderator

Talking Solar (405W) from old MH and putting in 07 Bounder. My question is I have to go 25 feet with #2 cable from combinder box to Controller (TriStar 45). Will #2 Cable be OK or do I need larger Cable? I have read so many pages on Solar installation and still lost. Thanks


RET ARMY 1980,DW Donna,"Tiny" (furkid). Class A, 2007 Bounder 35E, Ford V10 w/Steer Safe, 4SAMS 6V, 525W Solar , TriStar 45 Controller,Tri-Metric 2020,Yamaha 2400, TOW: Honda CRV. Ready Brake. "Living Our Dream". NASCAR #11,14,18,20 LOVE CO,NM,AZ


JohnnyT

On The Road

Moderator

Joined: 07/15/2003

View Profile



Good Sam RV Club Member


Posted: 02/23/12 04:16pm Link  |  Print  |  Notify Moderator

Moved from class A forum

2oldman

Nashville TN

Senior Member

Joined: 04/15/2001

View Profile


Offline
Posted: 02/23/12 04:28pm Link  |  Print  |  Notify Moderator

you're fine.

MrWizard

Traveling

Moderator

Joined: 06/27/2004

View Profile



Posted: 02/23/12 04:32pm Link  |  Print  |  Notify Moderator

moved to tech issues


Options, always have options, and the journey goes much smoother
....

Connected thru Verizon with HotSpot WiFi using a Samsung Galaxy Nexus


MrWizard

Traveling

Moderator

Joined: 06/27/2004

View Profile



Posted: 02/23/12 04:34pm Link  |  Print  |  Notify Moderator

#2 is fine .. your good
I've got mine wired with number eight from combiner box to controller and #4 from controller to batteries

mena661

Southern California

Senior Member

Joined: 03/21/2009

View Profile


Offline
Posted: 02/23/12 04:40pm Link  |  Print  |  Notify Moderator

2oldman wrote:

you're fine.
X2


2009 Newmar Canyon Star 3205, Ford F53 V10
Trojan L16 6V's 740 Amp-hours


smkettner

Southern California

Senior Member

Joined: 03/21/2005

View Profile



Good Sam RV Club Member


Posted: 02/23/12 04:49pm Link  |  Print  |  Notify Moderator

#2 seems fine. I would not spend money to go above #6. Although #2 will be fractionally better.

I calculate .5 volt drop with #6 and .2 drop with #2. Once the PWM controller is in absorbtion I don't think it matters a bit. About 3% power loss in bulk mode if that is enough to matter.


2001 F150 SuperCrew
2006 Keystone Springdale 249FWBHLS
675 watts solar
Send a PM if I missed something

Crazy Ray

Monroe,La

Senior Member

Joined: 01/17/2006

View Profile



Good Sam RV Club Member

Offline
Posted: 02/23/12 04:57pm Link  |  Print  |  Notify Moderator

Thanks to all. I tried to get this into Tech and could not get into Tech. I had about 60 feet of # 2 given to me.

msiminoff

Silicon Valley, CA

Senior Member

Joined: 12/31/2006

View Profile


Offline
Posted: 02/23/12 05:06pm Link  |  Print  |  Notify Moderator

With the 2ga you will have less than 1% voltage drop... You could use 6ga wire and still only have lose 2.5%.
If you haven't purchased the wire yet, you can save yourself a few bucks by using 6ga (which by the way has an ampacity rating of 102A).


'04 Alpenlite Saratoga 935, 328W of solar, 300Ah Odyssey batt's, Trimetric, Prosine 2.0
05 Ram3500, Cummins, Goerend Trans, Vision 19.5 w/XDE's, Dynatrac Hubs, RR airbags w/ping tanks, Superhitch, Roadmaster Swaybar, Thuren trackbar, RS9000XL/MyRide


CA Traveler

The Western States

Senior Member

Joined: 01/03/2004

View Profile


Offline
Posted: 02/23/12 06:01pm Link  |  Print  |  Notify Moderator

You're fine and can use smaller wire as posted above. But 2 suggestions:
1. Post # panels, panel info, wire length of each panel to the combiner box, plus the 25', and the length to the batteries. You'll get more information.
2. Consider if you might instead use a MPPT controller or upgrade in the future. In that case the wiring considerations are different and you may want to use those considerations even with a PWM contoller.


2009 Holiday Rambler 42 Scepter with ISL 400 Cummins
2004 Honda CR-V

Bob


This Topic Is Closed  |  Print Topic  |  Post New Topic  | 
Page of 2  
Next

Open Roads Forum  >  Tech Issues

 > Cable length for Solar
Search:   Advanced Search

Search only in Tech Issues


New posts No new posts
Closed, new posts Closed, no new posts
Moved, new posts Moved, no new posts

Adjust text size:

© 2014 RV.Net | Terms & Conditions | PRIVACY POLICY | YOUR PRIVACY RIGHTS