Battery Voltage

Submitted: Wednesday, May 18, 2005 at 13:26
ThreadID: 23090 Views:1698 Replies:5 FollowUps:7
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Just a quick and easy one (Hopefully) - What voltage should you let your fridge drain your battery down to before recharging without damaging the battery (in a dual set-up, not required to start the car).. The battery is an AC Delco Marine/4x4 battery that is apparently a combination deep cycle/high discharge.
Thanks
Drew
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Reply By: Footloose - Wednesday, May 18, 2005 at 13:37

Wednesday, May 18, 2005 at 13:37
Hi Drew. Can't help on the specifics, doesn't your fridge have a low voltage cutout ? Or are you asking if the cutout should be set at a higher voltage ?

I posted for info on Karratha earier in the year and I think you were of assistance, thanks. Son is now in Seaspray camp, wherever and whatever that is. My knowledge of the place has been extended...I now know its B hot there most of the time :))
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Follow Up By: Drew - Karratha - Wednesday, May 18, 2005 at 13:48

Wednesday, May 18, 2005 at 13:48
I'm not sure if the fridge does have a low voltage cut out? (Brand new 60l Engel Combi Box - maybe someone can tell me??). The weather is beautiful up here at the moment - not too hot, or cold - great for boating!
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Follow Up By: BenSpoon - Wednesday, May 18, 2005 at 17:38

Wednesday, May 18, 2005 at 17:38
seaspray or searipple?
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Follow Up By: Footloose - Wednesday, May 18, 2005 at 17:57

Wednesday, May 18, 2005 at 17:57
That could be it...he only mentioned it when he back for a week.
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Reply By: DD64 - Wednesday, May 18, 2005 at 13:53

Wednesday, May 18, 2005 at 13:53
Drew, try the site below it has a fairly comprehensive document on battery types etc & includes a table on voltage levels for a 12v deep cycle & % discharge. The table is based on "no-load" at rest for 3hrs or more. Suggests not to discharge below 20% (state of charge) which is approx 11.58volts. For better battery life many suggest not below 50% (particularly wet cell deep cycle) approx 12.06V.

www.windsun.com/Batteries
AnswerID: 111789

Reply By: Member - Ray - Wednesday, May 18, 2005 at 15:27

Wednesday, May 18, 2005 at 15:27
The one fault my fridge has is no low voltage cutout. Let the battery get too low last trip and the fridge sort of locked up ie It would not even start up on 240v until it had a good rattle and thump over some corugated roads. Can a low voltage cutout be fitted to an existing fridge?
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Follow Up By: BenSpoon - Wednesday, May 18, 2005 at 17:40

Wednesday, May 18, 2005 at 17:40
Ray- yes it can.
Head to Jaycar or Altronics- They sell low voltage cutout kits. wire that into your fridge power and you're sorted. Im not sure how fragile the electrics are in the cutout, you may need to get a relay to control the actual power disconnection from the fridge.
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Follow Up By: Member - Jeff M (WA) - Thursday, May 19, 2005 at 16:49

Thursday, May 19, 2005 at 16:49
Yeah I'm using one of those kits to trip my Arrid battery isolator. It's mounted under the bonnet and I can't see it through all the mud and crap and it still works good! ;-)
I just put some silicone around the edges of the box to seal it up. It's actually cable tied to the 4G wire that goes to the arrid so hence rattles around all over the place when the motors idling, never missed a beat!
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Reply By: Mainey (WA) - Wednesday, May 18, 2005 at 22:38

Wednesday, May 18, 2005 at 22:38
Drew,
Set your fridge at 12 volts and you will save your battery, because it is not over discharging and readily accepts the charge from the alternator, it can be set to run down to 10.5 volt when you are not in a position to start the vehicle due to going away for the day, maybe taking the good lady shopping or are going fishing etc, it is better to have a flat battery than warm beer, as the battery will recharge again with some persistence.
AnswerID: 111869

Follow Up By: Drew - Karratha - Thursday, May 19, 2005 at 14:16

Thursday, May 19, 2005 at 14:16
How go I go about setting the fridge at 12 volts (or 10.5 )? The only dial on the fridge is the thermostat, which will keep cycling until the battery is flat.
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Reply By: Mainey (WA) - Thursday, May 19, 2005 at 22:37

Thursday, May 19, 2005 at 22:37
(Quote)The only dial on the fridge is the thermostat, which will keep cycling until the battery is flat. (end quote)
that looks self explanetary, looks like you don't get to controll the voltage cut-out if you don't have the equipment, maybe someone knows of an add on system to controll voltage.
AnswerID: 112005

Follow Up By: Drew - Karratha - Friday, May 20, 2005 at 09:51

Friday, May 20, 2005 at 09:51
I just had a look on the Engel site - they sell a low voltage cut out for Engels. I am doing some tests at the moment on how long the Engel takes to drain the battery - I have also added a small computer fan in and will do the same test again with the fan going to see if there is any difference....
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