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4-10
#2 on a Dual Battery System:
With a battery selector switch commonly called a “battery isolator switch”; both the
house and the cranking circuits are always connected together at the selector switch. You
have the ability to switch between 1-2 or all of the batteries to connect to the house and
starter circuits. The current to charge the batteries, will come from the starter circuit,
flowing from the engine alternator to the battery switch common terminal. When the
engine is running you will have the ability to charge ether #1 or #2 or both of the batteries
at the same time.
When the engine is off, you will pull current for both the house and cranking circuit on
which ever battery you have selected or both batteries. With this system you are required
to manage the battery system, keeping both batteries charged and never run the second
battery dead. Sitting listening to an amplified stereo system with the selector switch on
“all” with lights on can drain both batteries. The best feature of this switch is you can
disconnect the electrical system of the boat and engine, and the amperage draw for the
computers and stereo memory during long and short term storage will be minimal. To
maintain optimum performance, make sure to manage the batteries properly.
Option #3, Dual Circuit Plus Battery Switch with VSR:
The Power of three switches in one!
• Simple On/Off switching
• Normal “ON” position isolates the starting and house circuits to reduce the chance of
fully discharging both batteries and protect on board electronics from engine starting
voltage sages and spikes.
The “Combine Batteries” Position parallels the two battery banks in the event of a low
starting battery.
The VSR manages the charging of the house battery bank automatically. The voltage
sensitive relay is basically a switch that connects the cranking circuit battery to the house
circuit battery, once the starter battery is fully charged. This allows the house circuit to be
separate from the cranking circuit completely. This is a true isolated, separate set of
circuits; house and cranking with two separate batteries. The common ground connection
and this VSR switch are the only way these two separate circuits can connect. The switch
is normally open, but once the engine is running and the voltage comes up on the starting
battery and it is fully charged, the VSR switch closes, allowing charge current to flow
into the house battery. This allows the alternator to supply current to charge the house
battery and supply operational current to house loads.
Once you shut down and the alternator is no longer charging, the VSR switch will open,
separating the two circuits again. Again the VSR has allowed two circuits to be separate,
so now any power you draw with the engine off; will come from the house battery. You
can listen to the stereo until the house battery is dead, but you can have the peace of mind
knowing that all you have to do is turn the key and your boat will start. No fumbling with
any switches, it’s all automatic.
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