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Old 02-01-2014, 07:08 PM
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After market Inverter

Just bought a 2014 F450 Chassis Cab. I go fishing each summer in Louisiana and bring frozen fish back to North Dakota. I have a chest freezer that draws 5 amps. Is it possible to add an inverter that would run the freezer while I'm driving? I'd unplug it at night when the engine is not running.

Thanks in advance for any insight you guys have!
Chip
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Old 02-01-2014, 07:11 PM
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What about running a little generator instead and take the load off of you alternator?
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Old 02-01-2014, 07:22 PM
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Quote:
Originally Posted by kinnisoj View Post
What about running a little generator instead and take the load off of you alternator?
I've been doing that and it works fine. My generator is pretty heavy so a pain to lift up plus you need to cover the electrical outlet when it rains. Just looking for a simpler decision. The truck has a heavy duty alternator that puts out 200 amps if memory serves me; don't know how much is "available" with the AC running, etc.
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Old 02-02-2014, 11:52 AM
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a 1000 Watt inverter will do the trick (5amps * 120 volts =600 watts, and room for power loss). I am not sure where the best place to wire it off of would be, whether right off the battery or off the alternator would be better, It may be able to be run off the plug in the cab I am not sure.
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Old 02-03-2014, 05:32 PM
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Quote:
Originally Posted by Chip Euliss View Post
The truck has a heavy duty alternator that puts out 200 amps if memory serves me; don't know how much is "available" with the AC running, etc.
That's 200A DC and is just the peak value. It's probably more like 160-170 at cruise RPM, and quite a bit less at idle.

Your 5A (AC) 120V freezer, as said above, is 600W. Assuming a 100% efficient inverter (not likely), that's 50A DC. Also, is that 5A you quoted the running draw or startup? If running, the startup draw will be quite a bit higher when the compressor kicks on.

So, in a real world situation, you're probably using a third or close to half of your alternator's output to power the freezer. Not saying you shouldn't try it, just keep those numbers in mind.
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Old 02-03-2014, 07:26 PM
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Quote:
Originally Posted by fiveohpatrol View Post
That's 200A DC and is just the peak value. It's probably more like 160-170 at cruise RPM, and quite a bit less at idle.

Your 5A (AC) 120V freezer, as said above, is 600W. Assuming a 100% efficient inverter (not likely), that's 50A DC. Also, is that 5A you quoted the running draw or startup? If running, the startup draw will be quite a bit higher when the compressor kicks on.

So, in a real world situation, you're probably using a third or close to half of your alternator's output to power the freezer. Not saying you shouldn't try it, just keep those numbers in mind.
I was wondering if the compressor would increase the draw enough to be an issue. The only time I'd plan to have the freezer going would be at highway speeds but taking a third or half of the output seems may be too much to expect from the alternator. Do you think the extra draw from the freezer would lead to premature alternator failure? Damaging the alternator may be too high a price to pay for the convenience of not having to lug around a generator. Many thanks for your input!
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