Dual Battery Management System Vs Manual 3-way Switch System
Submitted: Wednesday, Mar 26, 2008 at 12:16
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Rumbler
Me again
I know there's a lotta
views out there about this subject; but what's the Pro & Cons of a simple 3-way Switch (mostly fitted on boats I believe).
I know there's been a lot said about this subject & I've read most of it. It's the simplicity of the 3-way switch that attracts me. Let's say I THINK I wouldn't mind having to remember to "switch over & switch back" (big note staring me in the face!). In the most basic terms, how do cabin-mounted switches work in reality?
Treat me as a complete novice.
Thanks
Reply By: pepper2 - Wednesday, Mar 26, 2008 at 12:42
Wednesday, Mar 26, 2008 at 12:42
I have had two popular electronic battery systems fail over the years,changed to a manual switch,so far works faultlessly.BTW if you wire the batteries in parallel and fit a cut out device on the fridge you may not NEED any switching at all as the batteries are never drained below the cut off voltage leaving heaps of energy to start vehicle.
Other advantage of batteries in parallel is longer life i have the original starting battery in my patrol from 2002 still going.
If you have electric winch this may not suit i have hydraulic winch.
In my view electronic isolators are un necessary others will give differing
views.
AnswerID:
294806
Reply By: Jim from Best Off Road - Wednesday, Mar 26, 2008 at 13:05
Wednesday, Mar 26, 2008 at 13:05
If you have even a slightly suspect memory invest the $120 in a Redarc Isolator. Yes they can fail, but can be manually overidden so it is not a life and death issue. If they do fail, they still protect the start battery, you manually override it to charge the aux batt.
I recommend Redarc for one good reason. My first one failed and it was out of warranty. I mailed it back to them and had a brand new replacement, at no cost, within three days. You can't ask for fairer than that.
Jim.
AnswerID:
294807
Reply By: Member - Phil G (SA) - Wednesday, Mar 26, 2008 at 13:28
Wednesday, Mar 26, 2008 at 13:28
I currently use a switch between twin N70 Exide Extreme batteries. I keep it switched on all the time. Over
easter, I ran two 40l engel fridges from the twin batteries, and the voltage never dropped below 12.53v, but we were driving every day. So I didn't even need to isolate the batteries.
To do it this way, the batteries need to be identical, and are best bought in pairs. If one battery were to suddenly fail, you'd end up with two dead batteries, so its not a good system for a lone traveller. But the upsides are that its very simple, and its less stress on each battery.
I also have used electronic isolators, and they are a set and forget device. You should always be able to to start your vehicle. Just monitor the second battery voltage to know whats going on.
While we were away, someone had an isolator fail - caused the voltage to drop to 5V on their auxillary battery - not good. To fix it, we bypassed the isolator, recharged the battery with a days driving, and left it paralleled.
AnswerID:
294809
Reply By: Smudger - Wednesday, Mar 26, 2008 at 14:42
Wednesday, Mar 26, 2008 at 14:42
Greg,
I am a huge fan of the manual switches. One time I spotted dripping green coolant when I lifted the bonnet to isolate the battery at the end of a stinking hot day in the remote outback. In the cool of the evening I got to fix what was a very small leak, that could
well have become a very large headache next day.
Same goes for the morning routine of lifting the bonnet to re-engage the battery, perfect discipline for a quick vital signs
check of the engine ..oil, coolant, general look over.
4 years and more than 30,000ks out there, and the switch never let me down.
My current truck has an automatic isolator, but I'm now in that daily routine ..hopefully the electronic gizzmo won't let me down. If it does I'll probably replace it with a manual boat switch.
AnswerID:
294822
Reply By: Mainey (wa) - Wednesday, Mar 26, 2008 at 18:01
Wednesday, Mar 26, 2008 at 18:01
get a quality built Electronic battery isolator and you can FORGET about the battery system altogether.... how simple is that !!
I originally had a redarc (mechanical solenoid) fail, so replaced it with a Piranha Electronic system, upgraded to Rotronics Electronic, no hassles in about 8 years.
(will be all reasons you can imagine given for both sides of the 'argument' - just remember the "manual switch" relies solely on you - the Electronic system is fully automatic)
Mainey . . .
AnswerID:
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Reply By: Member - Davoe (Yalgoo) - Wednesday, Mar 26, 2008 at 18:36
Wednesday, Mar 26, 2008 at 18:36
Yea had solonoids both
mine and work vehicles never again. the irst you know a battery is stuufed is when you cant start it. Part of your pre start with the manal switch is startin on 1 battery then the other. You pick up straightaway a dodgy battery and can keep it isolated.
Oter thing is you would have to forget to isolate theswitch for at least 2 days before flattening both batteries are you that forgetfull?
All the hardcore esploration vehicles Ive used have had manuel switches (cole hersy) and ive neve walked due to a flat battery so thats good enough for me
AnswerID:
294858