| [GMCnet] First long trip completed but I have questions...... [message #284347] |
Sat, 08 August 2015 21:36  |
glwgmc
Messages: 1014
Registered: June 2004
Karma:
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Senior Member |
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One way or another you need to combine the house battery bank with the chassis battery bank when any charging voltage is present. That could be from your alternator, from shore power or from your Onan. It makes no difference where your batteries are located physically. If you have part of your house battery bank in the rear and part in the front, you need heavy wire, and appropriate fuses/circuit breakers, between them - depending on the size of the bank from 0 ga wire to 4 ga on both the + and the - sides. You must have the same size wire on both sides. The ampacity of the batteries will tell you what the wire gage needs to be. When in doubt, use larger wire. Your chassis batteries are likely all up front as is your solenoid switch that will combine the batteries for starting. Open the passenger side hood and you will see likely a diode isolator, a fined gizmo that has three terminals. The center one goes to the alternator. The outer two go one to the chassis battery band and the other to the house battery bank. If that still works after all these years it will isolate one bank from the other while in discharge mode and combine them while in charge mode. Far better from my POV is a thing called a combiner, a voltage controlled relay that will do the same thing without loosing voltage across the diode bridge. If any of this stuff is unclear, read my presentation and hopefully it will become clear.
Jerry
Jerry & Sharon Work
Kerby, OR
glwork@mac.com
http://jerrywork.com
78 Royale with most everything done to modernize a GMC mechanically
77/94 Clasco bone stock and looks like it just left the Clasco facility
Both drive equally as well.
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Message: 2
Date: Sat, 08 Aug 2015 18:35:43 -0600
From: Christopher Kruger
To: gmclist@list.gmcnet.org
Subject: Re: [GMCnet] First long trip completed but I have
questions......
Message-ID:
Content-Type: text/plain; charset="utf-8"
Thanks for the answers guys. They helped with all of the questions. The only thing I still have questions on is the combining of the front and rear
batteries. I now understand a combiner would be needed to get the charging from the chassis battery to charge the house batteries in the front. If I
am trying to use a front and rear batteries for a combined house battery system, rather that a house and generator battery system, do I need a
combiner between the battery banks or would it be just a parallel battery connection by running a positive cable to the front house set?
--
Chris
74 Canyonland 26’
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Jerry & Sharon Work
78 Royale
Kerby, OR
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