Inverter grounding

B

bidgood

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Joined
Jun 21, 2007
Messages
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C Dory Year
2001
C Dory Model
22 Cruiser
Hull Identification Number
CD022978E101
Vessel Name
Bidgood
I have a 24V to 110 AC inverter. 24V because it will be connected to the trolling bank. I have not found an answers yet on how to ground it in my CD22. It would be nice to have a cup of coffee in the morning without turning on the Honda generator.

Any thoughts on this.

Tom L.
 
It depends on the inverter. The flow thru type of inverters are 3 wire (white black and green)--the green is grounded to the green wire of the boat as it comes into the galvanic isolator. If you only have two wires--then the unit has a floating ground. (this is not unusual with inverters)--if you hook into the 110 V system, then it may show a weak light in the "reverse polarity" system. I would just ground the case of the inverter. Basically it is already grounded by the negative wire to the battery--but this should not be part of the 110 system.

Question: how are you going to charge this system under way? I have a 24 volt system on my 18 footer for the trolling motor and use the shore charger. I have had 24 volt systems on larger boats for windlass etc--and had a switching system to charge from the engine or 110 volt gen set.
 
I have a neat little unit I purchased out of New Zealand that takes the 12V off of the Yamaha 90 hp engine and charges the trolling bank. I never really worry about the level of the batteries because I cruise to my fishing area and then cruise back. I also use the 24V system for my engle dual voltage frige because it its more efficient. I am setting up a photo gallery and will post pics.
 
I figured out the grounding thing. The green wire just gets routed to the negative buss for the battery system.

I have posted the pics for the 24V battery and charging system in my new gallery. If any one needs the specific manufacturer info let me know.

Regards

Tom L.
 
The unit you have is a "Trolling bank voltage sensitive charging module:
described thusly:
Charging Modules give you the ability to charge your 24-volt trolling motor battery bank from your 12-volt engine charging system. Once the engine has started the unit allows the engine starting battery to be charged first. Once the engine starting battery has reached 13.7 volts the unit will engage and charge battery A in the trolling bank for one minute. In the 24-volt system, it will then disengage and charge battery B for one minute. It will then transfer back to battery A. The unit will continue to repeat this process while the engine is running. When the engine is stopped and the residual voltage drops below 12.7 volts the unit will disengage leaving the trolling bank isolated from the starting bank. The Trolling Bank Voltage Sensitive Charging Module will increase battery life and allow you to fish longer. Every time you use your outboard, you will be charging your batteries. 10-gauge wire recommended. Eliminate the heavy on-board charger from your boat and gain speed.
Click to expand...

Basciallty you are using a VSR to charge first the engine battery and then each of the 12 volt batteries--but not at 24 volts--you charge one 12 volt battery for a minute and then the other for a minute. Not sure how over all effecient this is, in comparison to a good 3 stage regulator--but since the Yahama outboard puts out 14.4-.5 volts it should keep the two 12 volt batteries charged up.

The major advantage of 24 volts over 12 volts is that it requires considerably smaller wire.

I would want digital meters to moniter voltages.
 
It works really well!
 
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