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Old 06-18-2012, 07:49 AM   #1
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Mini Fridge won't run on 200W Inverter?

I have a mini Fridge in the exterior kitchen of our 311BHS Sprinter. They gave us a 12volt plug next to it from the factory along with the normal 110v AC plug for running on shore power.

I bought a little 200W Inverter so that I could run the fridge off the battery as I drive down the road. It keeps setting off the low battery alarm when I plug in the fridge and then it blows its own fuse. I tried a larger 300W Inverter and still won't work. I charged the RV battery to full and tried again. Still nothing. Am I missing something?

Joe
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Old 06-18-2012, 08:03 AM   #2
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My thoughts are you would still need a larger inverter. Perhaps a 600 watt. What does the fridge say it requires for wattage? 1 battery may also not be enough to power the fridge for any amount of time.
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Old 06-18-2012, 09:48 AM   #3
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First question is....How may watts does the minifrig require to operate and also to start. A 200 to 300 Watt inverter is not very much power.

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Old 06-18-2012, 10:49 AM   #4
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I will double check. I thought it said 90W and 8amps to start. Will have to check again though.

My thought was just to run the fridge while we are on the road. Otherwise it will be on shore power. I would think the battery will be ok if it is being charged by my truck while connected right?
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Old 06-18-2012, 11:30 AM   #5
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From experience with those inverters over the years, mainly on 18 wheelers, over kill is always better. I've seen and heard of too many fires caused by over worked, under cooled units.

On my current 18 wheeler, I run a 2,500 watt unit just to run my computer, a small fridge, and an occasional vacuum. Of course, I have it wired directly to the batteries on less than three feet of double 0 cable.

For your fridge, I'd sure think about going with at least a 1,200 watt inverter, hard wired to the batteries on the least amount of cable possible. Might be excessive, but you'll virtually never have to worry about it again.
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Old 06-18-2012, 11:34 AM   #6
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I'll be willing to bet your biggest problem may not be the inverter but the wiring to that 12 volt plug.
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Old 06-18-2012, 11:56 AM   #7
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Auto hauler & 450 Donn,

That was one of my other concerns. My father and I were thinking that the wires from the battery have to run all the way to the rear of the RV (approx 36') to get to the little 12volt plug. I'm guessing they didn't run 0ga or anything close to it. So likely, I'll have to get a larger inverter, and also wire it directly to the battery with heavy ga wire. Nothing is simple

Thanks for the replies, this really helps.

Joe
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Old 06-18-2012, 12:37 PM   #8
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My first thought was "Not enough inverter" But I see that is wrong.

I used to have 1 100 watt dorm/office size fridge it would not start on a 450 watt inverter, Starting power is often 5 or MORE times the plated power requirement...

However that is not your problem, your problem is you are truign to run off that little acc power outlet they put in next to your fridge, Thus the inverter keeps signaling LOW BAT LOW BAT, as well it should, that outlet is only rated 100 watts TOPS, and the wires feeding it are way too small for your inverter.

Run a line direct to the batteries, with a proper fuse (30 amps for a 200 watt inverter) and see if that helps. if there are 12 volt terminals on the inverter use battery cable (4ga) since it comes with pre-attached terminals, put the fuse at the battery, and put the inverter in the compartment NEXT to the batteires, run standard 120 volt extension cord from there to fridge. OH one last tip, The two power cables (If possible get one red and one black) on the 12 volt side, tape them together as much as possible.
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Old 06-18-2012, 06:49 PM   #9
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Good catch there wa8yxm....

ken
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