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Old 04-21-2014, 08:50 PM   #1
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Mechanical Battery Disconnect Recommendations

Hello all,

I have a 2006 Gulf Stream Tour Master T-40. It has 3 battery banks -- chassis, house, and inverter (to run the 110 residential fridge, etc.). It only has 2 battery disconnect solenoid systems -- chassis and 12v house. My 6v inverter batteries are directly connected to a Xantrex inverter/charger which drains them dry in short order, even when off. I'd like to install a heavy duty battery disconnect, but am looking for a mechanical solution (not a solenoid).

I want to make sure the switch/blade is rated high enough for the power draw from the batteries, but I have no idea how to figure that out.

Any recommendations on where to start?

Dr. Mike

Dr. Mike
2000 Gulf Stream Scenic Cruiser
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Old 04-21-2014, 11:47 PM   #2
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First, determine what the watt output of the inverter is. For example let's say 2000 watt inverter.

Take watt rating divided by voltage. For our example 2000 divided by 12 volts from batteries = 167 amps

You would need a disconnect switch capable of handling 167 amps or more. Just substitute your inverter watt rating and divide by 12 to get the amp rating for needed disconnect.

Note ..... a little bit oversized switch never hurt anything

George R. - Fulltiming since January '03
2007 Newmar Mountain Aire 3991
2012 Chevy Malibu LT1
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Old 04-22-2014, 05:16 AM   #3
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There are several available from this company:


We used the "Big Switch with the lockout feature for the house batteries on our previous motorhome. The lockout wasn't necessary, but it was the only option available at the time. They're a little pricey, but do a great job and last forever.
2013 Adventurer 32H
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Old 04-24-2014, 03:16 PM   #4
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I put mechanical disconnects on all batteries in 2004. Have worked fine ever since. Originally they were sold by Harbor Freight and my version is now sold by OReilly or Autozone. They are now around $15 each and use a red insert "key" to connect and disconnect. Each of my four banks has one. Tie key with heavy duty string through hole to vehicle so you don;t lose it when disconnected. It does require a short new cable for each since unit has two brass connectors on back that red key switch connects. I connected on ground side just in case.
2005 30' Rexhall Vision, W-22 chassis, 19.5 tires, 208'' factory WB, 6000 CCC
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battery, battery disconnect

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