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I picked up a power Inverter to use in those situations where I need AC power. I have one of those Intex quick inflate pumps and was thinking I should be able to power that through my DC power port. One question I had was, if I needed the full 400 W of power, could I connect it to my battery and run it with my truck running to get the 400W full output? Is there anything I need to keep in mind?

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A 400 watt inverter is going to require about 33 amps at 12 volts. To use the full 400 watts you will need to run a 10 gauge wire from the positive battery post and include a 30 amp fuse or circuit breaker. You can use the frame or a separate 10 gauge wire for the negative side.
I have a 600 watt unit mounted under my passenger side front seat. I ran an 8 gauge wire with a 50 amp auto-reset circuit breaker from the battery to power it and used the seat bolt as a ground. It has a built-in power switch so I can leave it connected and shut off the switch when it is not being used.
 
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