Wife wants a camper with frig, charging question

[MedicineMan4040]

2021 4Runner TRD Pro, has 7 pin connector on the back.
I'm guessing 12vdc power on one of the pins.

Anyone know how many amps at that charging pin?

The camper she chose has 12vdc only frig/freezer (Everchill 4.3 cf).
We are hoping enough amps to make up the frig demand in the camper battery.

Camper comes with a 300ah Renogy self-heated lithium battery.

AI says the frig/freezer in question uses 3amps/hr maintaining and 8-9 at startup.

And I think, though not 100% the this 4Runner's alternator is 130amp...power there isn't a problem but how much Toyota sends to the 7 pin might be and of course voltage drop over the long run might be too.

Thanks for any thoughts on this.

 

[Humble Leader]

my 2012 has a 40amp fuse for the trailer brake. the vehicle should send 14amps to the 7pin. you can test this with a multimeter

https://www.youtube.com/watch?v=8FxnEwmmAnA&t=299s

there are lots of videos. I think I used this one when I was testing my 7pin and 4pin. you need to verify the 7pin has power even when the vehicle is off. I do not think it does but I could be wrong

 

[MedicineMan4040]

I think you are correct, from other reading I believe there is a fuse/relay so when the 4R is not running no power to the 7 pin.

The camper we're getting (Casita) routes power from the 7 pin to the meager at best converter to 'trickle' the house battery. If getting 14amps to the pin I might be getting 6 to the battery bank (long run, camper is 13 feet+tongue 4 feet....so a bit of loss along the way, but I'm just guessing.

But it might be enough to make up for the frig running since it is compressor type frig and efficient.

Thanks for chiming in. It all helps.

 

[CutthroatSlam]

Get a good ice chest.

 

[Babs187]

it would be more helpful with more information, but generally you will want to have it fused to ~35-40A. check the fridge current draw via the manufacturer specs. also, make sure to account for fuse placement and temp differences depending on your climate. a fridge in 40F weather vs one in 95F is two VERY different draws

 

[ArthurKotb]

Some vehicles allow a battery drain from the tow vehicle to the trailer even when the tow vehicle is off. My '04 doesn't do this. We have camped for over a week without any noticeable drain to the battery but then we're always on shore power, which charges the trailer batteries. Your fridge draws from the onboard camper batteries, doesn't it? Our wiring is set up to draw from the camper batteries and if we're driving the umbilical cord gets power from the tow vehicle (minimally) to charge the trailer batteries

If the specs say your fridge uses only 3-4 amps of draw I would say you should be fine. You can always test it with a clamp meter. I doubt that the 12v compressor runs all of the time anyway. (Our fridge is ammonia and it uses a 12v heater and I've never had a problem with battery draw.)