Heat Pump Power Draw (Traction Battery or 12V?)

Out of curiosity, does the heat pump draw off of the traction battery or the 12V battery? If I had the car in ready mode and had a 12V battery charger connected to the 12V battery, would I be able to run the HVAC off of mains?

 

Bah, some idle research may have answered my question.

https://www.denso-am.eu/media/corporate-news/2019/deneur19_08_ecompressors-a-guide-to-the-compressors-of-the-future/

Inverter – to drive the motor. The inverter converts Direct Current (DC) from the HV battery into Alternating Current (AC) for the motor. Moreover, the A/C ECU inputs compressor rotational speed signals to the inverter via the HV ECU to control the rotational speed of the electric compressor.

 

I'll have to give it all a shot, but it sounds like I could probably run the fans off of mains using a 12V battery charger, but the HVAC will drain out the traction battery and start up the ICE engine to recharge it. I'm not sure if the DC-DC converter will discharge a 12V battery to charge up the HV battery, but I somehow doubt it.

 

I was hoping to do a Prius-version of RV camping with shore power. If I had a connection to mains, I'd love to be able to run the HVAC without juggling with the EV cable. The (worst) workaround would be to get a small window AC unit and slap it onto the car.

 

Oh how I wish the Prime has a camp mode I tried to workaround it by setting a departure schedule for every 30 minutes overnight. It didn't work out well.

Mains as in electrical main line from the wall. The idea is that if I use my Prius as a super gas efficient RV camper, can I somehow hack the existing HVAC to be usable off of grid power. The consensus seems to be "no".

I already got that lovely adapter from Rob43 that allows me to plug into the NEMA 14-50 at RV campsites to charge up the car. This is sort of a logical progression of that idea.

As for slapping on a window AC unit to the side of the car.. I mean.. I was only half joking.

 

A Prime while on Ready and plugged in will power itself down after 10 or so seconds.

A Prime while on Ready and not plugged in will drain out 100% battery in about 6 hours of HVAC.

I guess it can't hurt to just run the AC in 6 hour intervals and charge up inbetween. Just more annoying.

 

Holy crap. I didn't think my old 2010 was still listed. I have a 2020 Prime XLE now.

Ready Mode in EV will drain out the HV battery first, then boot up the ICE to recharge. I timed it to take about 6 hours of one bar HVAC in Park before it would drain out 100% battery.

Ready Mode in HV, I assume, would behave like a normal Prius to preserve the current HV charge level. So it'll turn on the ICE once every 20 minutes and run for about 2 minutes.

If the Prime is ever plugged in, the whole shebang shuts off after like a minute. It was a pain because I was trying to tinker with the settings while charging and it wouldn't even let me keep the computer on.

What I haven't fully tested is the AC precondition when you set a departure time. This will start the HVAC up 20 minutes before your specified departure time so you have a heated/cooled cabin before you leave. I went through and added a departure time every 30 minutes every day to try to trick the car to always keep the precondition on. I ended up waking up in the morning to a fully charged HV battery and a dead 12V battery in the one test I did, so I'm not sure what happened.