Can the trailer 7 pin provide 30A sustained in 2022 while moving?

I see in specs that the trailer wiring + port is supposed to supply 30A to the house battery. Are there any funny things in that port like 30A while parked and 1 milliamps while driving, just like the "400W" inverter thingy.

I am putting in a 30A DC-DC charger for my bed battery, and if this thing can supply 30A without blowing fuses, I don't have to do wiring from under the seat to the bed.

 

12v @30amps is 6 AWG wire.

 

Pulling the full 30A continuous on a 30A fused circuit seems to be cutting it kind of thin. But it will be easy to find the right fuse to replace.

 

2-3 amps is typical, some of the highest rated vehicles are 10amp. I would be shocked if you get more than 5 amp. It’s not designed to run an rv. 30amp is what you asked, guessing because that’s what your shore power is, but that is A/C 30amp@120v, if your 7 pin does 30amp it would only be at 12v = 7pin is way less power. If you think about how thick the shore power cable is, there are only 3 wires in there. The smaller 7pin cable has 7 much smaller wires. Distance is also a factor, if you had 5 amp at the source, by the time it gets to the rv it’s only 2-3.

 

It’s not limited like the AC inverter is with gear position. You just won’t get 30A from the alternator at idle. Driving, yes. *Do Not up the fuse size as mentioned here. Its there to protect the wire and terminals from melting.

 

My DC-DC charger is 30A 12V aka 360W. If I can pull that, its fine

 

If you're running a DC-DC charger for the distance from the engine bay to the camper you'll likely need a dedicated 1awg or 2awg (maybe even 1/0 depending on where the DC-DC is installed distance wise if you get in the 50ft range). The trucks 7 pin probably has like 14awg or 12awg (waaaaay too small). Then there is the question if the alternator can even handle a 30 amp constant load for however long it takes to top off the house batteries in the RV. The smart charging system in the truck does all sorts of weird adjustments like only charging the battery on deceleration for better fuel mileage. Want to say the output on these alternators is kind of low, but don't have an answer on how low. I'm assuming you're trying to do this likely for LiFEPo4 batteries, so you'll be pulling the 30 amp the entire time its charging too and I would typically lean to the conservative 1/0 side for a constant load like that. A 7-pin harness isn't going to support 30 amps of charging load and you'll need a dedicated fused conductor straight from the alternator if you want to run that kind of load for a DC-DC charger. Bonus though is if you do an Anderson style connector to the trailer you could also use that for something like a rear winch too if you upsize the conductor even further. @ryanwgregg you happen to know what amp alternator we have in the Gen 3?

 

Thanks for your answers. I am now going for a 40A DC-DC charger connected directory to battery for my lifepo4 in the bed. Will wire 8 AWG with a breaker. According to Prius owners groups they have been doing 60A DC-DC chargers for a long time, but I will be conservative and just pull 500W max at 40A.
I will use the trailer 12V as ACC wire to trigger the charger only when vehicle is on.

 

@40 amps....as long as that run of conductor is under 6' or less then 8awg should be fine. Always found going up one size from the minimum (in this case that would be 6awg), is cheap insurance for the premium over the min and means the conductor will run at a lower temp under full load. But spend your money how you want and if the battery is in the bed and you're running to the battery under the seat assuming your in a Hybrid that run will be pretty short and I personally would make the small upgrade. I've used the Battery Cable USA place before and they had good prices, product, and fast lead times. Sounds like you got it figured out.

https://www.batterycablesusa.com/

 

Its a total of 4 feet run, that is why I chose 8AWG. I will just wire two in parallel since I have a lot of 8AWG now . So 2 red wires and 2 black wires on their own ring terminals.

 

What LiPo battery you going with? LiTime had a good sale over the weekend. I have a couple for my boat that have been solid.

 

I used the TM with low temp protection. 100Ah. + I am using a Delta 2 which I snagged for 649 for black friday. It has a 1800W (2700 surge) inverter. The battery is connected to delta 2 and currently I can charge at 15A. If I find it too less, I will hook up a 12-24 DC converter and then charge at 24V 15A instead of 12V 15A