nreiter wrote:I'm leaning toward using the 12VDC source, but using an existing outlet from our 2000W inverter would be easier and would only be until I can do the 12VDC wiring. That's why I'm looking for any experience with running the power supply from a MSW inverter. Most switching supplies work fine on MSW but not all, and I don't want to chance it if no one has done it before.
Most inverters provide "dirty" power, which could lead to "unscheduled reboots" etc. Internally, your system runs on DC anyway, so much of the "dirtiness" will be eliminated by the "bridge rectifiers" in your powersupply on your QNAP, but it will not address the issue of "spikes" etc, that are typically created any all but the most expensive inverters.
If you want to attempt a 12V solution you might want to look at the offerings of Mini-Box.com
, they offer a whole series of so-called "pico-PSU's" which are basically DC-DC powersupplies that can be used in PC's etc. They require a "clean" 12VDC input source, if wired in-line with a dedicated 12V battery, this would help keep the 12V stable, and allow the battery rather than the equipment to absorb any possible spikes from the power source.
I would however strongly recommend that you discuss any such plans with QNAP prior to attempting this, as swapping out the QNAP power supply could potentially invalidate your product warranty with QNAP. As much as I don't think an "inverter" is the correct solution, it might be more warranty-compatible, as you would still be using the "standard" QNAP PSU with your NAS.
Regardless of what solution you come up with, you probably will NOT want to operate your sensitive equipment, while your vehicle is charging off the alternator, as this typically will increase the voltage from 12V to 13.8V while charging, which could cause issues with your 12V equipment, that was never designed for this application.
Once you address the potential warranty issues, you might find that you want to keep your NAS as a 120V device, and only use it as such. You could use the USB ports to copy media to a external drive while connected to 120VAC, and use only the external drive with your Laptop or other devices while on 12VDC power. This would be likely to protect your warranty, and equipment, and yet still take advantage of allowing you to take your QNAP "on the road" when you travel.
It sounds like a fascinating project. Good luck....