2006 H33 3 batteries 2 isolation transformers

[tbert]

I have just bought a 2006 H33 that was previously a "Sail Time" boat. It's equiped with 3 batteries and 2 isolation transformers.
I can't find any info in the owners manual about this set up.
The boat has AC and power windlass.
The battery selector switch has only A & B for battery selection.

Can anyone tell me what the extra battery and isolation transformer are for and how they work?

Thanks,
Tony
2006 Hunter 33

 

[Maine Sail]

I have just bought a 2006 H33 that was previously a "Sail Time" boat. It's equiped with 3 batteries and 2 isolation transformers.
I can't find any info in the owners manual about this set up.
The boat has AC and power windlass.
The battery selector switch has only A & B for battery selection.

Can anyone tell me what the extra battery and isolation transformer are for and how they work?

Thanks,
Tony
2006 Hunter 33

An isolation transformer is a device that completely isolates the AC on-board power from shore power. They are VERY expensive and can be large. The only reason for two would be if you had two on-board completely isolated shore power systems.

Are you certain you have two isolation TRANSFORMERS or do you have two diode battery isolators..??? An isolation transformer would not be connected to a battery....

 

[Scott B]

We have an Isolation Transformer which is wired between the shore power inlet and the A.C. panel. Hunter schematic shows A/C run off the main A.C. panel without an additional Isolaton Transformer.

Ours is located right beside the water heater.

 

[Alex Dare]

If you have air conditioning on the boat, back in 2006 Hunter would most likely have installed a second AC line dedicated for it. That's why you have two isolation transformers. One for each 120v AC circuit.

As for the batteries, you will probably find that two of them are wired in parallel as a house bank and the other is by itself as a start (or backup) battery. The house bank could be switch position 1 and the start battery in position 2 or vice-versa.

You may also have an device called an echo charger installed. Because you have two banks of different size (capacity) it may be set up so that the charger is hooked to the bigger house bank. The house bank then, through the echo charger, charges and maintains the start battery.

I believe the idea was that Sailtime members would be instructed to always use the bigger house bank even for starting and not to use the "both" or start battery position at all.

The start battery position would then be used as only if the house bank was dead and they needed a charged battery available to start the engine and get them back.

 

[tbert]

If you have air conditioning on the boat, back in 2006 Hunter would most likely have installed a second AC line dedicated for it. That's why you have two isolation transformers. One for each 120v AC circuit.

As for the batteries, you will probably find that two of them are wired in parallel as a house bank and the other is by itself as a start (or backup) battery. The house bank could be switch position 1 and the start battery in position 2 or vice-versa.

You may also have an device called an echo charger installed. Because you have two banks of different size (capacity) it may be set up so that the charger is hooked to the bigger house bank. The house bank then, through the echo charger, charges and maintains the start battery.

I believe the idea was that Sailtime members would be instructed to always use the bigger house bank even for starting and not to use the "both" or start battery position at all.

The start battery position would then be used as only if the house bank was dead and they needed a charged battery available to start the engine and get them back.

Thanks Alex, this make sense. There is an echo charger.