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Dual Motor - 2 Battery Banks + House Battery Bank - 24v Electric System Installation

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Dual Motor - 2 Battery Banks + House Battery Bank - 24v Electric System Installation

Old 06-02-2016, 04:13 PM
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Default Dual Motor - 2 Battery Banks + House Battery Bank - 24v Electric System Installation

Hi

My friend has a big boat that he is recovering.
He his a little low on cash and probably will have to improve his boat by steps.
First he wants to get the minimal to put the boat in the water and to start and make some money.

His boat has 2 motors - Volvo Penta TMD 60B

Each motor has a 24v alternator.

He will have 2 12v batteries bank for each motor to provide/charge 24v.

He will have another 2 12v batteries (house batteries bank) to provide 24v and 12v to the equipments.

He plans to install battery switches.

Later on he plans to install ACR's.

Later on he plans to install solar panels to charge the batteries.


He wants to be able to use any battery bank to start any off the motors (in case of a power failure).

In is 24v house battery bank he wants to power 24v and 12v equipments.


How can he do this installation (install the motor banks, charge the house bank and have 24v and 12v power from the house bank, and install battery switches to use any of the battery banks to power any motor) and what does he needs to start with so it will be easy to add the other items when he gets the necessary cash?
Old 06-02-2016, 08:15 PM
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Having 24 volts is a good thing because:

1. You can use lighter gauge wire for the installation saving money.
2. Higher efficiency appliances
3. It allows you to put your batteries in series as too many in parallel has a chance of complete meltdown if one of the battery cells fails shorted and allows the other batteries to discharge thru it.
4. You get a little more efficiency from your batteries.

With series, be sure your batteries are the same age and capacity.

I would try my darnedest to stay with 24 volts for everything, but if you Google, 24 volts to 12; you will find many converters for sale.

You can use the same switches because a switch does not care what voltage is running through it. A switch does care how many amps are running through it.

Here is a link to the best description about 1/Both/2/off switches I have found. http://forums.sailboatowners.com/ind...usings.137615/

He will be using a battery charger and 120v power so he may want to consider a galvanic isolator. Here is a link to a good discussion on these. http://forums.sailboatowners.com/ind...usings.137615/

There is a good discussion of solar power on this board. http://www.thehulltruth.com/marine-e...el-advice.html
Old 06-02-2016, 08:33 PM
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I agree with Chessyman - stay with 24v wherever possible, for the few things that cant be 24v, use a 24to12v converter.

DONT get 12v by tapping from between the batteries, this will unbalance them leading to undercharging one, overcharging the other and drastically reducing the life of both.
Old 06-06-2016, 01:13 PM
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Ok Guys

The setup would be something like the one in the image, with the solar panel connected to the house bank?
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