Thread: New Fridge

High out 11.7V and in 12.7V. While the fridge is running off the starting battery, is it safe to use the high level protection and will my D2 V8 start with 11.7 volts? This sounds too low to me! I think a full charged unloaded battery usually sits at 12.2V?

A fully charged lead acid battery will show 12.7 volts. 12.2 V is generally considered 50%.

I think it would be a bit brave to leave the starting battery drop to11.7,especially in cold weather.

Maybe invest in one of those mini jump starters prior to fitting a second battery.
Regards Philip A

Will a D2V8 start on 11.7V.

No.

sounds like your fridge is set up for a storage battery

Hang on guys ... remember, that under load, a batteries voltage sags. So when the voltage is drawn down to 11.7v and the saftey disconnects the power, the batteries voltage will recover ... probably dam close to 12v.

The LVD will be affected by the size of the load connected to the battery. The bigger the load, the more the batteries voltage will be drawn down ... disconnect the load, voltage rises.

can I assume you are not talking to me Kev?

It doesnt quite work.as literally as that and the reading is taken under load. I have my 40l Ironman in the back set up like yours with HD wiring and narva plug. I tried all 3 levels of protection....i found the best is the lowest and allows the fridge to run for longer before cutting out. I have a stock size single D2 lead.acid battery and my fridge will run for over 2 days at 2 degrees c without charging. As soon as it cuts out for low voltage there is plenty in reserve to start the 4.6. You simply dont know from the sound and urgency that the battery has been drained somewhat. Dont forget too that batteries in good condition will cycle back up pretty quickly once the load is removed.

Like PhillipA has noted i carry a little lithium jump pack just in case but have never required it. A dodgy batterys at the end of its life might be a problem but my Interstate at 2 years doesnt show signs of suffering yet.

Cheers

Originally Posted by Pedro_The_Swift

can I assume you are not talking to me Kev?

... depends ...

My Td5 will start at 11.7v ... just ... on the Optima Yellow D31, but they have a lot of reserve still at low voltage.

As far as the OP asked, using 11.7v shut-off setting, the battery voltage should rise somewhere back to or above 12v when the fridge is disconnected by the LVD setting ... and that should be enough to restart the D2 V8 ... as long as your starting battery is in good condition ... If it has a lot of age on it, maybe not.

Remember the sagged/loaded voltage is what the fridge will see and use to trigger the disconnect ... NOT the "at rest" voltage.

An at rest voltage of 11.7v is not good for a battery .... especially if left in that state of charge for any considerable length of time.

One thing to remember is that the fridge will not be the only draw.

It may be that the doors are opened or the radio on after the fridge has cut off and the ECU may wake up.

This may drop the voltage down further. You will have to constantly be on your toes that spouse or progeny do not excessively open doors etc.

Regards Philip A

Bottom line. Good battery well looked after....stick the fridge on the lowest voltage cut off and enjoy very cold beers.

Cheers