Dual Battery DIY Kit, Split Charge

Model #: NLS355

Usually Ships in 24 Hours

Price: $494.45

Overland Journal "Editors Choice", 2008 Dual Battery System Comparison
Why use a Dual Battery System?
Losing power to your vehicle is a common concern. With all the latest equipment drawing on your battery system, you need to consider your electrical supply and how to manage it. Winches, lighting, laptops, GPS, fridges, and the like all demand a lot from your battery. A good solution is a dual battery system that can manage the load you put on it. National Luna Battery Management Systems are time tested, proven vehicle energy control equipment. From the harsh demands of Africa, National Luna offers a complete line of monitoring and control options.

Dual Battery Kit
The National Luna Intelligent Split Charging Kit is a complete turnkey Dual Battery system, that includes an Intelligent Solenoid, Dual Battery Controller, and all the necessary materials to complete the job. Battery and tray not included.
Here's how it works!

The National Luna Intelligent Split Charging System allows you to maintain two batteries in your vehicle. The Intelligent Solenoid manages the charging of both of them when the vehicle is running, and isolates them when the vehicle is off. It is all automatic. You can monitor the status of the batteries, and manually override the connection from the Dual Battery Controller.


Wiring the dual battery system is simple. You do not modify your existing electrical system at all.

- Connect a cable from the primary battery positive lead to the left side of the solenoid on the Intelligent Solenoid.

- Connect a cable from the secondary battery positive lead to the right side of the Intelligent Solenoid.

- Connect a cable from the primary battery negative lead to the secondary battery negative lead.

- Connect the control wire from the Intelligent Solenoid to the primary battery negative lead.

- Plug the Dual Battery Controller into the Intelligent Solenoid, and run the cable into the cab of your vehicle to a convenient spot.

- You are done.

Intelligent Solenoid Functions

- The Intelligent Solenoid (IS) senses an incoming voltage of greater than 13.1V when you turn on the vehicle.

- The IS starts an internal timer for 5 minutes, keeping the full charge to the primary battery to recoup for the discharge of starting the vehicle.

- After 5 minutes, the IS automatically closes the circuit in the solenoid, allowing current to flow to the seecondary battery.

- This connection remains closed until the IS senses a voltage of less than 12.7V across the system. This is most commonly when the vehicle is shut off. Brand new batteries can often maintain a charge above 12.7V for a while. The IS will keep the connection closed until less than 12.7V is available, then it will open the solenoid circuit isolating the batteries from one another.

- The IS will keep the batteries isolated until it once again senses a voltage greater than 13.1V. Then it starts the timer and the whole process begins again.

- This process is fully automated. You do not have to manually manage the charging of the second battery.

Dual Battery Controller Functions

- Monitors the charge level of both batteries on both voltage and percentage based scales.

- Low Voltage Audible Alarm will let you know when your battery is running low.

- High Voltage Audible Alarm will let you know if an unsafe level of current is flowing through your system.

- Manually override the solenoid connection for jump starting and winching.

- Lights and alarms can be manually shut off.

Dual-battery isolator (intelligent solenoid)
Dual battery controller (monitor)
Cable ties
Instruction manual
3 year comprehensive warranty
20' of heavy-duty silicone core cable (10' each, Black & Red)
In-line power fuses
Accessory fuse
Cable lugs
Battery terminals


Physical size   

4.25"L x 2"W x 1"H

2 oz

Power supply    
8Vdc - 15Vdc (display range: 11.4V - 14.2V)

Low-voltage warning   
DC voltage below 11.4V

Over-charge warning   
DC voltage above 14.65V

11'6" 4-core cable

Power consumption   
8mA (sleep mode-option) , 35mA average , 40mA max

Shipping Dims   
16"L x 16"W x 4"H

Shipping Weight
10.5 lbs

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