| If you like the single switch shown in Figure 3
above, but need the protection from sensitive electronics during starting, then Consider Figure
4 below. Connect a simple micro-switch to the BIC-75300 so you can manually combine batteries before
switching. This will reduce arcing and save wear on the heavy switch
contacts. As above, the remote manual switch and
remote LED indicator connections are not shown. 
Figure 4
Pros:
- Optimized configuration for a single "two-bank switch" with sensitive
electronics isolated from the starting circuit.
- Simple. Minimal wiring needs.
- External solenoids NOT required. Can be used with up to a 110 Amp
alternator
- Two or more BIC's can be used in parallel to increase current handling capacity.
- Medium Cost. (Unless you already own the switch.)
- Simple to understand, installation!
- Simple automatic charging operation! No need
to leave the switch in the Both position for charging. No hassle,
worry free.
- Ability to switch positions while the engine is operating (even to OFF)
without damage to the alternator. The only risk here is in the event of a
circuit failure that causes the circuit breakers to open while the engine is running.
- Simple manual parallel combination via a remote micro-switch.
From a remote console, you can use very small wire running a long distance to
switch the batteries in parallel!
- The Hellroaring BIC-75300 and BIC-75150 limit inrush currents when switching.
No arcing to wear out the device!
- Ability to switch from one battery at 50% discharge to the other battery for an
additional 50% discharge thereby extending battery life. Always place the
switch in position "1" prior to starting to ensure isolation from sensitive
electronics on the dc load circuit.
- No diode voltage drop effect when ON!
Cons: (these may not all be cons)
- Alternator protection device recommended. If the circuit breakers, fuses, or
fusible links open while the engine is running, the alternator may be damaged.
- In this configuration, the BIC-75300 handles up to 110 amps continuos for either battery
circuit and up to 170 amps total from the alternator when
"ON". We recommend you limit your alternator size to 110 Amps for
this circuit. When combined manually, it will handle up to 150 amps
short term between batteries.
Therefore, when starting while you have one dead battery, the switch
must select the both position unless you have allowed at least 15 minutes for
charge to transfer.
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