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Old 04-05-2016, 19:17   #1
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Join Date: Sep 2014
Location: AUSTRALIA
Boat: DUNCANSON 40' PILOTHHOUSE
Posts: 24
Replacing my Battery Charger

Hi Everyone,
I have a question on how to replace my old battery charger with a new smart charger.
Firstly, The Original System.
It comprises of a TECSUP, HITEC 25A12V battery charger which is plugged into a 240v outlet, which receives power via an 600W12V DC to AC inverter which in turn is powered by a 5KVA Yanmar Genset.
So the battery charger is drawing power from the genset.

Now the new Projecta IDC25 charger is a 3 stage smart charger, rated at 25A.
The instructions show diagrams of it wired to the starter battery, (charged by an alternator)via a +ve and -ve wire both with 50A fuses, close to the battery. Then there is a single wire connecting to the aux. battery, supplying a charge. There's also a temp sensor to connect to the aux. battery as well.

My question is, How do I wire the new charger so it is getting the source of volts to charge my house batteries? I'm wanting to know if I can connect it to my genset.
Would I damage anything if I was to take the +ve & -ve wires from the Projecta charger and wire them into the wires from the powerpoint? The old system is simple and makes sense. Genset-Inverter-power outlet-charger-battery.
I've spoken to a distributor for Projecta, who just kept saying I need a starter battery that hold 13.5V, wire it to the unit and that will feed the charger for the house batteries.
It's a new world to me, I've owned and worked on a few 4x4, no worries. Now I look at the system on my yacht and just throw my hands up. There is an isolator switch for the house batteries, and another box that has switches to select Bank ! or Bank 2, then the starter battery for the Main engine has its own isolator switch. So when I start the main I have the house isolator set to BOTH and the starter battery set to BOTH.

Any advice would be greatly appreciated. Thanks
PS. My yacht, "Athena", is a 40' Duncanson Pilothouse Sloop. It has a Nissan SD23 main engine and a 5.5KVA Yanmar.
Cheers Jos
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Old 04-05-2016, 22:24   #2
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Join Date: Jun 2013
Location: canada
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Re: Replacing my Battery Charger

Quote:
Originally Posted by Duncanson40 View Post
battery charger which is plugged into a 240v outlet, which receives power via an 600W12V DC to AC inverter which in turn is powered by a 5KVA Yanmar Genset.
So the battery charger is drawing power from the genset.

this makes no sense....
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