Brand New Blue Sea System #7650 "Add a Battery" system is designed to automate charging of two battery banks while still keeping one bank in reserve for engine starting. They systems has two components.

The dual circuit battery switch keeps the two banks completely separate except when put in the emergency combine position.
The ACR is an automatic combiner which links them together when either bank is receiving a charge. The entire easy to install package means that you don't need to remember to move switches when charging but you will still have a start battery in reserve when you need it.
# A complete two battery bank management solution
# #5511e Dual Circuit Plus Battery Switch isolates engine and house circuits, and combines battery banks for emergency starting
# The #7610 120 Amp SI ACR automatic charging relay combines batteries for charging
http://bluesea.com/category/2/productline/overview/329Brand new In packaging $100 plus $10 shipping, please send me a PM if interested
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2005 Horizon 230 5.7 GI/DP 280-HP
2005 Suburban "The Battlewagon"
