You have a very small 12 volt battery. I don't think it would last very long unless you had the system turned on. I wouldn't do it. Remember you can't even jump start another car unless it is a Venza.

 

That's right. I plan to keep the car in READY mode in order for the traction battery to charge the 12V.

 

Doesn't the traction batt start the engine?

 

That's right. According to my research and experiment, it also charges the 12V battery when the car is in READY mode, outputting ~14V.

Moderator deleted my reply, I suppose.
2nd try.
The inverter size has nothing to do with a Venza.
Best to search Google regarding the use of a 12v inverter and sizing out the battery AH based on load.

Thanks. Think of it as a swimming pool. The 12V battery is the pool. The inlet(traction battery or main hybaid battery) can fill the pool at (let's say) 100A. So if I draw more than 1200W from the inverter, the battery level in the 12V will inevitable drop. That's why I need to know the max charging amperage from the traction battery.

 

Moderator deleted my reply, I suppose.
2nd try.
The inverter size has nothing to do with a Venza.
Best to search Google regarding the use of a 12v inverter and sizing out the battery AH based on load.

 

No posts were deleted in this thread.

 

A shot in the dark, but have you considered a dual battery set up? Lots of off roaders and campers set up dual batteries. You could run some heavy cable to the trunk and use Anderson plugs to connect your second battery in parallel while the car is running to charge. When you need to use your inverter, unplug your second battery and hook it up to the inverter where needed so it doesn't drain your main battery. Just a thought!

Make sure your inverter can handle the temporary overload due to in-rush.

 

I believe with the Japanese version of the Rav4, you can get 1,500 watts at 100v. Note: You would need 125 amps at 12v to deliver 1,500 watts. So size your wire accordingly.

 

I have considered using a 12v LiFePo4 battery with a dc to dc charger operating off the battery with some sort of cutout for when the vehicle is not under charge. I only want to keep a 12v compressor type fridge cold.

 

LiFePO4 batteries are good solution with a dual battery setup. Could use a solenoid to disconnect the second battery when the vehicle is off (i.e., solenoid is closed with key in on position).

 

You need a generator, not an inverter.

 

Even better!

 

Aux 12 v battery is charged with DC to DC inverter , don’t think is rated for 166A . Most likely you will fry electronic parts , best scenario is fuse . I don’t think prius was built as mobile generator . But i can be wrong.

 

its prob cheaper and much easier and safer to just get a 2000w generator $600 bucks you can get one of these, and you wouldn't have to leave your trunk open all the time so the bugs get in.

2000 Watt Portable Pure Sine Inverter Generator CARB/EPA Compliant

Powerful yet portable, the new AIMS 2,000-Watt Portable CARB-Compliant Inverter Generator from the Inverter Store is also a good neighbor, wherever and however you use it. CARB compliant means it meets the California Air Resources Board’s strict air pollution regulations. This generator is also...

www.aimscorp.net

 

I would not do it. 2000Watts is a lot of power. It won't take long for your battery to become unable to start your car.

 

the dc to dc converter will output a max. of 100 amps .

 

It seems as if you, first, need to get your data from the vehicle's manufacturer as to the capabilities of the vehicle's electrical system to support 'accessories.' And what might void your warranty.
Then you need to get on a camping conversion blog where you will find all manner of conversions (temporary and otherwise) designed specifically for the purpose you (OP) describe.
If that leads you to a solution that is not clearly in line with the recommendations and parameters from the manufacturer, you might need to get on an Electronics list to ask specific questions about ratings, wire gauge, and such that an EE would be able to answer by simply 'doing the Math.'
It would be a real PITA if you microwaved your coffee one cold December morning and it blew the power on your Venza - 'cause getting a tow out of a National Park in a snowstorm to keep from being found a week later frozen in your back seat could prove problematic.

 

I plan to go off-grid camping during December. Planned to visit several national parks.

You post these questions on 3 November while claiming to have planned this adventure . . . ?

 

You should "camp" at the Holiday Inn.

 

.02

Plus you have the draw of the electric fan and electric pumps for the engine coolant and inverter coolant. And a battery is not a reservoir nor does it possess a cooling system. Electricity is not water and cannot passively flow from traction battery to lead acid battery to inverter. Constant chemical reactions from charge and discharge cycling at that level of will turn that tiny un-cooled lead acid battery into a furnace generating heat from sustained heavy cycle chemical reactions. My guess is that using an external inverter with a draw of that size in excess of design specs for normal vehcile use is looking for trouble. May not adversely affect the cooled Li traction battery but will likely push the enclosed uncooled tiny battery well beyond its ability to safely dissipate heat.

 

Makes sense. I've downgraded my expecation to 1200W, which should be enough to keep me warm outside. Thanks for the tip