Dual Battery Systems








Battery Systems
Installation to shut off all power at source. This is as simple as it gets. On-Off. No questions here. The key is that the bilge pump must have a separate line to the battery positive when you leave the boat with the battery switch in the off position.
Installation to select a starter battery and auxiliary battery Manually isolates each battery, parallels both batteries for start, master disconnect, manually selects batteries for charging. This is a very common system. There are several modes of operation where this will operate correctly. Switch back and forth during operation of the engine between battery 1 and 2. This will provide the maximum charge for each battery while running. Unless special conditions apply, use a both position for starting and running. Switch to the "house" battery for drifting or anchoring. If your bilge pump does not have a separate feed to the battery, when you leave the boat leave the house battery in the on position. If it does have a separate feed, off is the correct position.
Installation of isolator automatically selects lower charged battery to be charged first. Full battery can not discharge to drained battery. Dedicated system, no flexibility, no "power" start parallel or master disconnect function. Easiest to operate, least flexible. Batteries charge based on which is lower in voltage. The other issue here is if you drain your starting battery, you need to move batteries around to get going.
Installation of an isolator automatically isolates each battery, lower charged battery will automatically be charged first. Two different size batteries can be used, larger for ship services, smaller for engine starting. Switch selects usage, master disconnect, "power" parallel function. It allows some of the highest flexibility and ease of operation. Batteries can be operated in either mode while allowing for charging. Both battery starting is available, (reducing system stress) yet with the isolator feature to charge the lower battery first. This system works for all engine installations.
Installation for use on powerboats, sailboats and trawlers, used for temporary living. Third battery isolated from other ship circuits. All batteries being automatically charged while running through isolator. To be used for refrigeration or other heavy load devices. Isolator protects other batteries. Switch selector usage: 1. Master Disconnect 2. "Power" Parallel function. Has the same features as in 4 above, plus the isolation of a large house load like a refrigerator or air conditioner. Note that via the isolator again, all batteries are automatically charged based on which has the lowest amount of charge
Installation of isolator separates both alternators so both alternators will charge simultaneously, automatically charges lower charged battery first. Batteries 1 and 2 can be used for start, third battery, ship's source. Again similar to 4 and 5 above, but adds a third to deal with the house loads.
Installation of dockside multi-bank charger with built in isolator which will automatically charge lower battery first. Plus the features in the above configuration.
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