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Go Back   SailNet Community > On Board > Gear & Maintenance > Electrical Systems
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Old 09-12-2013
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Inverter Question

When I bought this boat found out it appears the Xantrex inverter is wired where when power is disconnected from the shore power it automatically tries to run all the 110 V systems. Shouldn't there be a switch in between somewhere to turn the inverter on and off. Has some other weird wiring that I'm still trying to figure out. Has a Guest 3 way switch but also has a 3 way on the panel that was original but they're all connected some how and make no sense. Have to sit down and draw it all out one day if I can trace them all. Needs to be a cleaner way

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Old 09-12-2013
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Re: Inverter Question

Is there any chance the mystery battery switch is wired to the inverter? Inverters can draw a lot of current so it seems there is a chance they'd use a high current battery switch for it.

Otherwise, yes, I'd think there should be a switch to disconnect the inverter.
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Old 09-12-2013
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Re: Inverter Question

I suppose it depends on the actual model.

I have a Xantrex Freedom 25 which is a 110V 2500w inverter/charger and behaves exactly as you describe when connected/not to shorepower. It has a small switch on the left top of the front panel but it is hard to miss so I'm guessing your model is different.
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Old 09-12-2013
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Re: Inverter Question

When disconnection from shore power the AC panel main breaker should ideally be turned off. You have an inverter with an auto transfer switch and this is normal behavior. Just shut off the AC panel before un-pluging....
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Re: Inverter Question

the battery has a cluster of wires that need to be sorted out. I don't think any from the battery switch are going to the inverter. Pretty sure I just need to start over. Batteries have way too many wires going to it which tells me they have a mess going.
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Re: Inverter Question

Maine Sail

Been doing as you suggest as part of my pre flight checklist and just flip the AC power switch. Wiring is still off. Good fall project to clean it
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Re: Inverter Question

I've got this same stupid feature on a Mastervolt combined charger/inverter. You have to actively shut the inverter off at the panel after removing shore power or it just runs. Who was the engineer who thought this up! Guess someone thought you'd want 110 on the outlets no matter what, automatically. Not a sailor with a limited battery bank.

I've had a yard ruin batteries by running the inverter for weeks without detecting it was on.

The Mastervolt has a switch on the inverter that has 3 positions. On which provides this "wonderful" feature, off, and charge only. I leave it in charge only unless I'm cruising. Plugged in on the dock, if shore power fails, this wonderful system will run down your batteries if you run it in the on position.
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