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Old 12-10-2021, 10:24 AM   #1
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Disconnect house batteries from alternator

Have a 2015 Allegro 36LA. Thinking of putting a disconnect switch on wire from chassis battery to solenoid that sends current to house batteries. installing solar on roof with Victron controller, which will keep house batts up to snuff while traveling without a constant 14.4v. Can always flip switch to on after boondocking if voltage is down & batteries need a little help.
Any thoughts welcome.
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Old 12-10-2021, 01:02 PM   #2
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Other than not seeing the necessity, I don't think there is anything wrong with doing it. What is the reasoning?
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Old 12-11-2021, 07:07 AM   #3
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At least on a 2014 Allegro Bus, that solenoid is the boost solenoid. It only connects the 2 battery banks when you hold the boost switch on the dash down. Therefore, normally the alternator has nothing to do with the house batteries. I know around 2016 Tiffin started installing a BIRD.

If it a boost solenoid, I suggest you replace it with a BIRD. Just did it myself. This way the alternator will keep both battery banks charged while driving, the solar panels (I have 3) and/or shore power will do it if sitting.
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Old 12-11-2021, 08:32 AM   #4
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On the reason, there is no regulating of the voltage going to the house battery. A constant 14.4v is not what is needed after being hooked up to shore power, just boiling batteries. Having solar on top will regulate what batteries actually want. At least that's the reasoning.
Tiffin tells me this is normal for gas MH with residential fridge. The Voltage is displayed on the spyder control, when rig is running it's 14.4v, so i know batteries are just cookin' wanting to control that is all. Maybe I'm not seeing things correctly
Probably end up replacing Tripp-lite inverter with a Magnum when they are available
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Old 12-11-2021, 10:21 AM   #5
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Has your alternator output always been 14.4 volts. Seems high.

Could have a bad voltage sense wire going to the alternator or the alternator may have an adjustable voltage regulator.

13.9 to 14.1 volts is typical. At that voltage, for the hours you drive, it won't cook your batteries.

You may also be able to stop the bridging solenoid from closing by switching the ignition wire going to the controller. You won't need a battery cable size switch.
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Old 12-12-2021, 08:06 AM   #6
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Thanx for the input, once we finish the solar, will post about which direction we took,
thanx again
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