Sunday, Apr 04, 2004 at 17:12
G'day Richard & Leonie,
I agree with Errol 100%. I have numerous accesories all running off my second battery. I have used a deep cycle job and it goes
well for a while initially, but after a few weeks on the road, I noticed that it wasn't charging up as
well as it did when we first left
home on a trip. After some investigation, I found that it wasn't getting enough charge during the day's driving to completely top it up for the next night's running of fridge, lights etc. So now it's 2 cranking batteries. My GU is 3.5 years old and still has the original starting battery after 118,000klm. The 2nd battery is now a Exide Extreme N70ZZ. I have a warn 9000lb winch and it is connected to the main battery. It doesn't get much use, so I don't believe it makes a great deal of difference which battery it's connected to. Just as a side note, I have installed a heavy duty in-line switch on the POSITIVE line to the winch in case any low life ties to crush my roof by hooking the cable to the tow bar and shorting out terminals on solenoid box.....just for kix.....mongrels.
Now to switches. I use a simple solenoid set-up. It is wired to my wiper motor as a "trigger". This means that the 2 batteries are electrically isolated as soon as the motor is turned off (ie: if the windscreen wipers won't work, the batteries are isolated). I could have left it at that, but also installed a switch in the cab. The purpose of this switch is to continue to have the 2 batteries isolated, even when I have the motor turned on. This can be useful if, for example, you have used the 2nd battery too much the night before and know that it is quite flat. If you don't have such a switch, then as soon as you turn the ignition on the 2 batteries will/may try to "equalise" (a bit like to tanks of water joined by a hose.......if one is full and the other empty, then when a tap is turned on between them (ignition), they will try to equalise). If this happens, you may find you do not have enough cranking power to start the engine, even though the starter battery was fairly fresh.
I've gone one step further and installed a voltmeter and yet another switch. Using this switch, I can swap between the 2 batteries to
check what voltage is in each. Of course once the truck is running and I have switched the solenoid on, the voltmeter reads the same no matter which battery it is switched to read. So, before I start in the morning, I
check to see how flat the 2nd battery is. If is down really low, I make doubly sure the solenoid is switched off.
The system I use is one you can very simply make yourself. However, it does not have any electronic components, & I don't know whether that could be a problem for a new vehicle with electronic black boxes etc.
I know it sounds complicated, but it really isn't.
I would like to steer you away from Deep Cycle batteries.....they are best suited to electric wheelchairs and the "go karts" used by the oldies.
(no disrespect meant to anybody).
Cheers,
Roachie
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