I'm a fan of the National Luna system.
http://www.nationalluna.com/
This one looks promising :
Sierra Expeditions is pleased to announce that we are now carrying http://www.sierraexpeditions.com/index. ... list&c=298
IBS - Intelligent Battery Systems.
This computerized dual-battery manager kit was developed in Switzerland. This state-of-the-art system uses a RISC micro-computer to either isolate or link multiple batteries as needed. Normal operation separates the starting battery from the auxiliary battery to safely power electrical accessories when the vehicle isn't running. An override button links the batteries for high-load uses such as winching and is also used for self jump-starting. In-cab monitoring, which uses an LED display to show each battery's state of charge, is available. The system is offered in 12-volt and 24-volt models (controls four batteries). Installation involves an included power cable and a pre-made four-wire harness. The IBS won a Global Media Award as one of the best new products at the 2009 SEMA Show.
http://www.sierraexpeditions.com/index. ... ail&p=2074
Dual Battery Systems (DBS) kits include:
[*]200A Relay (12v Systems)
[*]In-cab monitor with flush mount (optional mounts available)
[*]Wire Harness
[*]10' of 4g positive and negative cables
[*]All connectors needed to complete installation[/list]
Features:
[*]Low Battery Alarm on both batteries (Beeping and flashing LEDs) - Can be de-activated by pressing display button.
[*]Selectable display (bright or dim)
[*]Link Failure alarm (beeping and flashing LED)
[*]Forcible Link Deactivation in case of aux battery failure.
[*]Bi-Directional Automatic Battery Linking
[*]Manual Battery Linking - 30 & 120 min[/list]
Installation is easy with only 4 small gauge wires that need to be feed through the firewall, no clips or funky connectors. You can see the install of our unit we used for testing http://www.expeditionportal.com/forum/s ... tcount=703" here and http://www.expeditionportal.com/forum/s ... nt=704here
The optional mounting brackets make installing the Battery Monitor a breeze, there is three mounting brackets in case the include flush mount just doesn't do the unit justice:
http://www.sierraexpeditions.com/index. ... ail&p=2076
Swivel Mount:
http://www.sierraexpeditions.com/index. ... ail&p=2077"]Horizontal Mount:
http://www.sierraexpeditions.com/index. ... ail&p=2078
Goose-neck Mount:
At this time 24v options are not available, but should you want us to bring some in on the next inbound shipment please let us know.