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ContinuousWave: Whaler Repairs/Mods
Two Batteries, One Engine, Separate Circuits
|Author||Topic: Two Batteries, One Engine, Separate Circuits|
posted 06-02-2001 03:49 PM ET (US)
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?
posted 06-02-2001 06:13 PM ET (US)
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
posted 06-03-2001 10:20 PM ET (US)
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.
posted 06-05-2001 11:31 AM ET (US)
Whaletosh, I would appreciate a schematic. JIM
posted 06-05-2001 03:07 PM ET (US)
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