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--- electrical:dual_battery [2016/12/31 18:23]
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-====== Dual battery setup ======
-Most suited for very light use, a dual battery system charges both the house and starter battery from the alternator.
-In order to keep from getting stranded it is set up as a one way system:  the house battery can be charged from the alternator but the house cannot pull power from the starter battery.
-===== isolating the house battery =====
-//"the simple continuous duty solenoid is the easiest simplest most effective  way to have battery isolation"//((http://www.cheaprvliving.com/forums/Thread-difference-between-battery-solenoid-isolator-and-switch?pid=201415#pid201415)) - Sternwake
-The house battery is sequestered by one of the following methods:
-**solenoid** - the generally preferred method is to use a [[http://amzn.to/2g7eOJs|continuous duty solenoid]] to connect the house circuit when the ignition is in the RUN position.((http://www.cheaprvliving.com/forums/Thread-difference-between-battery-solenoid-isolator-and-switch))
-Solenoids are generally cylindrical.
-A solenoid "costs" about 0.8A to keep the electromagnet energized.((http://www.cheaprvliving.com/forums/Thread-difference-between-battery-solenoid-isolator-and-switch?pid=201415#pid201415))
-**isolator** -
-[[http://amzn.to/2gygv86|Battery isolators]] use diodes to keep power from flowing from the starter battery to the house battery.
-Isolators are generally brick shaped an have heat fins.
-An isolator "costs" about 1v in losses across the diodes.((http://www.cheaprvliving.com/forums/Thread-difference-between-battery-solenoid-isolator-and-switch?pid=201415#pid201415))
-**manual switch** -
-A [[http://amzn.to/2gsDtNc|manual battery switch]] normally has 4 positions:  **A**, **B**, **A+B**, and **Off**.  //A// would be for the starter battery and used during starting. //B// would be used for house use when one is not driving.  //A+B// could be used to combine both sets for starting or for charging while driving.  This kind of setup is prone to user error.
-A manual switch has no current or voltage losses.
-===== challenges =====
-House batteries require a lengthy [[electrical:smart charger|absorption stage]] that takes multiple hours.  It is unlikely to get the house battery completely charged unless one is driving significant distances.  This can have an impact on battery longevity.

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