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Old 07-06-2011, 01:50 AM   #1
RevDavid
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Default Capacity of OEM alternator '08 STi

I'm building a teardrop trailer with the intention of pulling it with my '08 STi and wondering about the capacity of the car's system to provide some power to the trailer.
I'd like to be able to "trickle charge" the batteries in the trailer and power the small refrigerator while traveling.
I know the alternator is supposed to be rated at 110 amps, but how much does the car use itself under normal circumstances? Is there "head room" to provide the trailer with some power also?
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Old 07-06-2011, 05:48 AM   #2
Uncle Scotty
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you would have to determine the load that the trailer will pull first....and the load the car is pulling will vary on what electrical equipment is being used

110A should be enough unless the refrig is real inefficient....a trickle charger is negligible
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Old 07-06-2011, 03:55 PM   #3
RichardM
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Based on pulling travel trailers in the past, you will have no problems keeping the refrigerator going while towing. The trick is remembering to switch to gas when you stop. Otherwise, the trailer battery will be run down very quickly. Also, be sure that the 12V you plug the trailer into is on only when the engine is running. Otherwise, the refrigerator will run the car battery down also.
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Old 07-06-2011, 10:23 PM   #4
RevDavid
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Default okay!

Thanks guys!
The refer is only a 120vac unit; no gas or 12vdc so there's no changing over involved. I'm thinking of installing a relay for the power and energizing it from a circuit which only powered when the vehicle is running.
thanks for your help.
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Old 07-07-2011, 12:12 AM   #5
RichardM
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My present fridge operates on AC or DC or gas. I assume you are going to put in an invertor to power yours from DC when going down the road. I think that should work just fine. I was about to say the invertor might have to be oversized slightly but the refrigerator cools with a straight resistance heater, no power factor to consider.
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