The information below come from the Forum - Musings With Maine Sail (LINK) . My version of the set up is slight modification to that originally suggested in Maine Sail posting. It is a battery switch set up which includes a dedicated ON/OFF switch for a starting battery but also retains a flexibility of a 1/BOTH/2/OFF switch to use the house bank for start redundancy.
With this simple but very redundant system you retain all the isolation & redundancy of the 1/BOTH/2/OFF switch yet add a dedicated direct wired starting battery. Simply keep the 1/BOTH/2/OFF to #2 and control the house power with a DC main breaker at the panel. When you are ready to start the engine simply turn the ON/OFF to ON and your to start the engine. When you're done with the engine flip the switch to OFF and you no longer have an energized line to the starter.
If the start battery were to fail, flip the ON/OFF to OFF and the 1/BOTH/2/OFF to 1 and now the house bank is starting and providing house loads. Conversely you can still use the start bank to power house loads in an emergency with the 1/BOTH/2/OFF in position BOTH and the start switch to ON. This latter configuration also allows for starting via both battery banks if needed.
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| Modified set up as used on Johanna Rose. The 1/BOTH/2 switch located in the engine compartment and is left in the switched #2 position always for normal operation. The On/Off switch is located with easy access by the companionway and is only switched on for engine operation. In an emergency, the 1/BOTH/2 switch can be moved to #1 allowing for the house bank only to start the engine with the On/Off set to Off or with the On/Off set to On for both bank starting. |
The photos below show the set up on the Johanna Rose. The 1/BOTH/2/OFF switch is located in a safe out of the way location in the engine compartment. This switch is left switched to #2 for normal starting operations. The 1/BOTH/2/OFF switch was intentional placed out of the way to avoid helpful hands from inadvertently making changes. The ON/OFF switch is easily assessable from an arm reach in the cockpit or inside the cabin. A Blue Sea 8084 AC/DC Main Panel is powered directly from the house bank. Also shown, is a Blue Sea ACR-si which is a high current automatic relay that senses the presence of a charging voltage and combines the battery banks for charging. If the charging voltage drops then the banks are disconnected. In addition, the batteries are each protected with a 300A MRBF terminal fuses. [Thanks goes out to Maine Sail for the forum discussions]
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| The 1/BOTH/2/OFF switch located out of the way in the engine compartment. |
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| A dedicated and easily assessable ON/OFF switch is used to energize the cable to the starter. |
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| A Blue Sea 8084 AC/DC Main Panel. |
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