![]() ![]() The 1/2/B is switching only the DC positive conductors and has nothing at all to do with DC negative. If I had a dime for every-time this question was asked, I’d not be writing this article. “But RC where does DC ground connect to on the 1/2/B?” ![]() A 1/2/B switch has just three terminals and four positions. One area of confusion we see fairly routinely is a boat-owner misidentifying the 1/2/B switches terminals. MHT Recommended Products Affiliate Disclaimerġ- Bank Isolation – The ability to isolate a battery bank from both loads and charge sources in the event of a bank or battery failure.Ģ- Cross-Connection Use – The ability to use either on-board battery bank as the sole use bank, meaning it serves as starting and house load bank in an emergency, This design criteria should always include #1.ģ- Ease of Use – A battery switching design is no good if the boat owner does not understand it. Many boat owners don’t have the luxury of starting from scratch and the existing switch can usually be re-used/re-purposed easier, and in a less costly way, than converting to an entirely new switch configuration. This article is only intended to showcase how the 1/2/BOTH switch can be used in an easier and often less confusing manner. Let me be clear on this point this is not our preferred method, it is simply a method. Vanner model 52-75 has been designed to meet the requirements for the 12 Vdc medical outlets stated in section 3.7.7.3 of the GSA specification KKK-A-1822D.Preface: I’ve seen & read many on the internet suggest that “The 1/2/BOTH is RC/Rod’s/Compass Marine’s preferred switching method”. To prevent voltage spikes and surges caused by turning the battery switch off while the engine is running, please follow the GSA recommended wiring diagram on the reverse side. ![]() A Schottky diode reduces the loss by one-half of a typical silicon diode Vanner battery isolators operate on both 12 and 24 volt DC electrical systems.Īs current passes through an isolator, the diode type affects the voltage loss across it. This is desirable in many vehicles where more power is required, and is mandated on ambulances that must meet the GSA’s specification KKK-1822-D. Schottky battery isoltors are designed to reduce the voltage drop across the isolator’s terminals, allowing a higher voltage, or charge, to be delivered to the battery. Both types utilize a special heat sink design for excellent heat dissipation and heavy-duty wiring terminals. Vanner manufactures both silicon and Schottky type battery isolators. With a battery isolator operating in the system, the power would not be taken from the engine’s battery, keeping it fully charged. With the engine off, the DC to AC inverter could continue to operate, discharging the second battery. With the engine running, the alternator will supply charging current to both batteries. Due to the isolator’s ability to pass current in only one direction, your first battery can be discharged without draining power from the second battery.įor example, a typical vehicle system may use one battery dedicated to the engine (starter, ignition, etc.) And the other battery dedicated to a DC to AC inverter. Vanner battery isolators allow dual batteries to be charged from a single power source such as an alternator or battery charger. ![]()
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