Can't run a portable freezer on B&D battery station

the Danfoss dc compressor fridge
usually a better job and use less power

MrWizard wrote:
That's why the dang thing cost do much, it's the compressor and insulation

very good.

It'll do 'just as good' a job as a 120v one with higher wattage?

2oldman wrote:

drifter_wayfarer wrote:
I could've bough a 12V freezer than runs on cigarette ligher outlet,

That won't work well either, unless you have big thick wires feeding that outlet.

The typical 12v Danfoss dc compressor, draws about 4 amps at 12vdc
Aka 48 watts

The avg 12 cig plug can handle this with no problems

That's why the dang thing cost do much, it's the compressor and insulation

.

As well as the current surge problem this would be a modified sine wave unit, which at best is much less effective with an inductive load (like a motor) and worst case will never work regardless of how much power it can supp!y.

As mr wizard said even if it did run it you would not get even an hour of runtime. More to this electrical stuff than you would think so it is best to ask the question before one makes purchases.

Sam

drifter_wayfarer wrote:
I could've bough a 12V freezer than runs on cigarette ligher outlet,

That won't work well either, unless you have big thick wires feeding that outlet.

Found this in the product overview.

"Additionally, the 12 Volt power supply option allows for a wide range of applications from home use to field use to in-vehicle use."

I looked it up on Home Depot - for some reason I can'd post a link, says the site is down.

It's simple
79w is about 0.7 amps at 120v but that is 7 amps at 12v
The killer is the compressor start up probably a surge of about 60 amps dc to provide 6 amps 120a.c. To start the compressor
That's why I have a 1200w inverter to run my 100w residential fridge
Compressor start is around 900w

Even if you got it started you would only get an hour or two of freezer run time
It's going to draw 7 amps from the battery while running
I doubt that battery is larger than 10 amp hrs

Your not the first one to miscalculat 120v power use to 12v power
You won't be the last one either

You might be able to return the battery station
Put that money toward buying a 600w inverter, that is 600w continuous 1000 surge, you need to be able to hold that 600w until the compressor spins up and is running, were taking one l or two seconds
Not milliseconds that most inverter surge ratings are
Connect that inverter to your RV batteries

That 500w connected to a small battery won't work

The inrush (start up) current draw for a compressor based refrigerator/freezer can be considerably higher than the running current draw. You need more inverter. Most likely in the 1500W to 2000W range to start the freezer.