So I've been toying with a/c ing the garage. Fairly well air sealed and 2 walls+ceiling are conditioned house.
We have been sitting mid 70s in the evening and the garage usually stays about 80. When I connected a single 8 inch duct to the garage, I got the temp down to mid 70s. Not impressive, not cooler than outside. The battery liked it but only by a few degrees. I have the duct pointed under the car. It is a 3 car garage with 14 ft ceilings and 3 west windows (low e).
So I've envisioned a car cooler. A blanket over the car, a box that you drive onto etc.
So for proof of concept, I had some extra 6 inch insulated duct. I cut it into 4 pieces and surrounded the battery on the undercarriage. I opened a little section and shoved my 8 inch duct into that. Ran the a/c and did pretty well
5am - battery 78 degrees. 6:30 - battery 70 degrees (range 67-73 or a little wide). Ambient temp in garage 78. Outside 74. By my calculations, this costs about 2 cents an hour.
I'm leaving town for a few days and that was my impetus for doing this temp test. The car is 75% SOC and I usually get down below 50 when I am leaving town. So I wanted to chill it.
My more stable plan is to use 1x6s in a box configuration of 4ft x6ft and drive onto it every night. I have some solid rectangular duct to connect the box too. This won't seal as well as the current system but it might do pretty well to maintain 60 degrees below the car.
My anticipated cost is $6 a month and I plan to run that for June-Sept or $24 a year. My goal is to drop the average battery temp 10 degrees over the summer which probably takes getting it 15 degrees below ambient garage but given what I got in 1.5 hours, I think that is pretty reasonable.
I have a Seer 16 a/c and pay $.05 off peak which is why my costs are so low. It is a 4 ton unit and I estimate this 8 inch duct is using about 10% of the air flow. It takes 3.5 kw to run at full speed, so 350wh to the car or $.02 an hour. Monthly estimate based on 10 hours of run time (which is way overkill) - I usually prechill overnight for 5 hours.
All EV garage BTW. Will post temps when I get back. I plan to run the a/c overnight some for dehumidification anyway - but yes, I'll run it more than I would have without the car.
We have been sitting mid 70s in the evening and the garage usually stays about 80. When I connected a single 8 inch duct to the garage, I got the temp down to mid 70s. Not impressive, not cooler than outside. The battery liked it but only by a few degrees. I have the duct pointed under the car. It is a 3 car garage with 14 ft ceilings and 3 west windows (low e).
So I've envisioned a car cooler. A blanket over the car, a box that you drive onto etc.
So for proof of concept, I had some extra 6 inch insulated duct. I cut it into 4 pieces and surrounded the battery on the undercarriage. I opened a little section and shoved my 8 inch duct into that. Ran the a/c and did pretty well
5am - battery 78 degrees. 6:30 - battery 70 degrees (range 67-73 or a little wide). Ambient temp in garage 78. Outside 74. By my calculations, this costs about 2 cents an hour.
I'm leaving town for a few days and that was my impetus for doing this temp test. The car is 75% SOC and I usually get down below 50 when I am leaving town. So I wanted to chill it.
My more stable plan is to use 1x6s in a box configuration of 4ft x6ft and drive onto it every night. I have some solid rectangular duct to connect the box too. This won't seal as well as the current system but it might do pretty well to maintain 60 degrees below the car.
My anticipated cost is $6 a month and I plan to run that for June-Sept or $24 a year. My goal is to drop the average battery temp 10 degrees over the summer which probably takes getting it 15 degrees below ambient garage but given what I got in 1.5 hours, I think that is pretty reasonable.
I have a Seer 16 a/c and pay $.05 off peak which is why my costs are so low. It is a 4 ton unit and I estimate this 8 inch duct is using about 10% of the air flow. It takes 3.5 kw to run at full speed, so 350wh to the car or $.02 an hour. Monthly estimate based on 10 hours of run time (which is way overkill) - I usually prechill overnight for 5 hours.
All EV garage BTW. Will post temps when I get back. I plan to run the a/c overnight some for dehumidification anyway - but yes, I'll run it more than I would have without the car.