Fridge, Engel and Dual Battery
Submitted: Sunday, Feb 23, 2003 at 22:42
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CC
Hi,
Q1. Does anyone know if the Engel 40 ltr has a low-voltage cut-off function to prevent the battery from draining flat ? Waeco 40 ltr has that feature.
I have a Toyota factory dual-battery system on my Hilux but it is a simple parallel (just a wire connecting the 2 positive terminals of the batteries) on 2 identical starter batteries. Questions :
Q2. If I buy the Waeco (which has a low-voltage auto cut-off feature), should I still be bothered with a dual battery management unit (i.e. isolator) ?
Q3. If I do buy a dual battery isolator, should I change one of the batteries to a deep cycle one ? Because they are both starter batteries ? What's the down side of running the fridge on the 2 identical starter batteries ?
I am inclined to buy the Waeco (or the Engel if it also has the low voltage cut-off function) and just live with the simple parallel set-up, but I am a bit concerned about that "single point of failure", in other words, what if the low-voltage cut-off circuit in the fridge fails ?
CC
Reply By: Trevor - Monday, Feb 24, 2003 at 01:17
Monday, Feb 24, 2003 at 01:17
This info came from the Engel hotline 1300 302 653
Engels aren't fitted with a low voltage cutout because unlike other brands they are not damaged by low voltages.
They do however lose efficiency below about 10.5v. The fridge will still remain quite cold, but will run more frequently as the volts drop.
If you are camped for extended periods you may need to charge your battery every couple of days, depending on weather, fridge use, battery size etc.
We have a 39L Engel.
The dual battery setup consists of the normal Starting Battery and a deep cycle one.
A solenoid connects them in parallel when the engine is running and seperates them when it is not.
We don't have any voltage sensing circuitry or variable rate of charge equipment.
The local Auto Electrician says they are over complicated and a waste of money, but will happily install one if you really want it.
Cheers,
Trev
AnswerID:
13811
Follow Up By: Diamond - Monday, Feb 24, 2003 at 08:43
Monday, Feb 24, 2003 at 08:43
i spoke to a few auto electricians and was also told just simple solenoid set up no need for expensive set ups just throwing your money away but he said i have one here it will cost you $200 odd bucks and laughed
FollowupID:
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Follow Up By: Gob - Monday, Feb 24, 2003 at 18:22
Monday, Feb 24, 2003 at 18:22
cc the only extra i have to your set up is a switch under the dash and connected to accesories so that when you start car it shouldnt go straight to main bat and if you want to sit with radio on etc you can switch solenoid off so no drain between batteries
steve/gob
FollowupID:
8235
Reply By: Coops - Monday, Feb 24, 2003 at 08:45
Monday, Feb 24, 2003 at 08:45
any low voltage cut-out is designed to protect the compressor and NOT your battery. It will cut out
well below when it is required to for battery preservation (personal experience here).
Not a fan of deep cycle batteries myself but thats getting into Nissan v Toyota territory. Deep Cycle plates are 100% lead I believe and as such may damage easily if you give your car a solid workout.
I would highly recommend a battery isolator and if you search this
forum you will find ALL the information you require as this type of question has been posted over & over again. That's no big deal as there's always someone knew to throw a bit of light on the subject but try the search and I'm sure you'll get what you're looking for.
cheers
AnswerID:
13818