User Manual

DUAL SENSING SMART START

SBI

Dual Sensing Smart Start

SBIs or ‘D’ Series SBIs monitor both the start battery and the auxiliary. If the

unit detects that either battery has exceeded 13.2V the isolator will be connected. The beneﬁ t of the

dual control enables the user to charge the main battery from a solar panel or battery charger on the

auxiliary battery. The SBI12D has the added feature of allowing charge both ways.

FAULT INDICATION

NOTE: The LED may stay ON for a period after the vehicle is turned OFF. This in NOT a fault.

Should a fault occur, the Smart Start

SBI is set to notify the operator of the fault. The LED will ﬂ ash

repeatedly with the following sequences:

CODE 1 2 Flashes Over-Voltage

CODE 2 3 Flashes Voltage Drop or Excessive Current Draw Fault

FAULT CODE 1: 2 Flashes (Over-Voltage Detection)

If the batteries connected to either terminal of the Smart Start

SBI should rise above 15.5 Volts (31

Volts on a 24 volt system), the Smart Start

will:

• Disconnect, if connected, to prevent the source of over-voltage reaching the other battery

• Flash the LED 2 times for 20 seconds, then reassess the fault condition, continuing until the fault is

cleared.

FAULT CODE 2: 3 Flashes (Voltage Drop / Excessive Current Draw)

If the Smart Start

SBI detects a voltage drop across its contacts of greater than 1 Volt for more than ½

second then the unit will:

• Immediately protect itself by disconnecting the auxiliary battery; and

• Flash the LED 3 times for 20 seconds, then reassess the presence of a fault, continuing until the

fault is cleared.

Fuse*

* When using fuses make sure that the fuse makes

a good low resistance connection.

Circuit Breaker/Fuse ratings are dependent on the

type of installation and the size of the loads.

Auxiliary

Battery

Start

Battery

SBI12D

Circuit

Breaker*