Only if you add an appropriate battery charger!
If you are planning to do that then consider a voltage controlled battery
combiner. The battery charger can be connected to the house battery and also
charge the chassis battery when connected to "shore" power. The really good
charger-power supplies will do a very good job of maintaining batteries
while in storage.

Note that charging a battery and having a 12 volt power supply are different
functions. RV-Marine chargers (better ones) are designed to compromise and
work well for both functions. The charger-power supply needs to be sized for
the battery you wish to charge and the load that will be on while charging.

Dennis

-----Original Message-----
From: Vanagon Mailing List [mailto:vanagon@gerry.vanagon.com] On Behalf Of
Alain Thibault
Sent: Sunday, November 17, 2013 8:33 PM
To: vanagon@GERRY.VANAGON.COM
Subject: GoWesty Aux Battery

Allo all
Does someone know if  the GoWesty kit for the auxiliairy battery allow the
auxiliairy battery to charge when the camper is hooked and using 120V
current as in the EV campers?  Thanks in advance Alain Westfalia 1986