Hidden 200psi air compressor and 2.5gal tank installed under bed vault

[HaulingAss]

Simple answer: 4:29 and 9 minutes..

Long answer: here’s a few performance metrics and comments for this setup. Overall still finding this setup works well. At some point, I probably need to change out the 24v converter for a dedicated 28v converter. VIAIR calls for 28v and that should decrease total fill time by about 5 minutes for 4 tires. The efficiency and speed of the VIAIR is dismal compared to the California Air compressor (1/2 the power, 1/4 the fill rate), but for DC compressors, I haven't seen a better option.



For 28v, I used a victron buck-boost converter laying around, set exactly at 28. Under load, the victron maintained an accurate 28v whereas the 24v converter dropped to about 23.5v. I'd guess the 24v setup uses about 250W with efficiency losses factored in. Maybe 275W for the 28v setup since the converter brings the voltage down to 24, then the victron boosting to 28. The victron can't handle 48v and I haven't found a dedicated 48-28v DC-DC converter.



The times below are to first reach each set point. An additional 15-20 seconds was necessary as the pressure settled.

PSI	VIAIR 24v	VIAIR 28v	Cal Air 110v
0-35 tank	1m	1m	18s
35-50 tire	6m	4m 29s	1m 12s
50-65 tire	7m	5m 54s	2m 48s

With the 2.5 gal tank full (~200psi), this can fill one tire from 35-50 in <1 minute and ends up leaving the tank at 72psi. From there, it's about 9 minutes to refill the tank to 200.



The California Air compressor (~$150) fits perfectly in the frunk. This is a great option if quick fill time and easy setup is important (and higher psi is not needed). Had this sitting around so I was originally using this until the VIAIR setup was ready.

Cal Air 1P1060S

https://www.californiaairtools.com/...ompressors/3-5-hp-air-compressor/cat-1p1060s/



Victron Buck-Boost Converter

https://www.victronenergy.com/dc-dc-converters/buck-boost-dc-dc-converter-25a-50a

Good data points! Thank you.

I think your tire fill times would improve quite a bit just by using a four tire filling system (like the MorrFlate). Those Schrader tire valves are the real bottle-neck so flowing air into all of them simultaneously reduces the amount of work being done (by reducing the backpressure the compressor is fighting against). Schrader valves were designed for much smaller tires than those on the Cybertruck.

For those who missed other threads on tire filling, the little 18 lb. Chinese compressor I bought can fill all four AT tires quicker than the times you measured for filling one tire with the Viair compressor.

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[rairforce]

That setup is nice! Thanks for the idea.