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Author Topic:   Two Batteries, One Engine, Separate Circuits
whaleryo posted 06-02-2001 03:49 PM ET (US)   Profile for whaleryo   Send Email to whaleryo  
I just bought a new battery that I will use as my primary battery. I want to use my old battery to run the lights, radio etc and plan to charge it using a separate AC powered charger. I've run separate circuits for these accessories. My question is:
Do the grounds from the two batteries have to stay isolated or can the radio get its ground from one battery and is power from the other?
triblet posted 06-02-2001 06:13 PM ET (US)     Profile for triblet  Send Email to triblet     
Grounds should be common. With a BIG cable
between the two grounds.

So there's only one side.

You should wire it so you can charge either
battery under way.


Whaletosh posted 06-03-2001 10:20 PM ET (US)     Profile for Whaletosh    
If you do get a battery switch, make sure you get the make before break type. The marine supply store should be able to help.

I solved this problem with a custom isolator/inrush circuit of my own design. It provides proper isolation of the battery banks and is fully automatic (does have a manual overide). Plus it has a visual readout of fonctionality which shows proper and fault conditions. It does have one flaw, which is why there is a manual over ride. It has been a while since I used it, but I will be making one for my new boat eventually. If somebody is interested I could whip up a schematic. It isn't expensive.

JimU posted 06-05-2001 11:31 AM ET (US)     Profile for JimU  Send Email to JimU     
Whaletosh, I would appreciate a schematic. JIM
Whaletosh posted 06-05-2001 03:07 PM ET (US)     Profile for Whaletosh    

Ok, let me whip it up over the weekend. If I forget then e-mail me reminding me to wake up.

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