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What you are looking for is called a USV meaning a battery to safely shutdown a pc. Normaly this is used for server in case of power loss. But you can use them on a normal PC aswell. The drawback is that those things are not cheap and really heavy so if you are planning to make your installation mobile a USV would be too heavy. The NUC uses quite a lot of power so there is no way to power it by USB. If you really want a small device with a small battery i would rather go for a raspberry pi asuming that your audio panel is not needing a heavy cpu.
Shoot, the i5 NUC is actually the minimum processing power that I can use for this application, and the small form factor is ideal. I'll have to keep looking, maybe to build a very small USV. It seems like the power requirements for a shutdown sequence basically wouldn't require a lot of battery.
Thanks for your response, and having USV gives me another vital search term.
AAre you sure you aren't talking about a UPS? I thought by "USV" you were talking about a more specialized UPS that is only meant to safely shutdown a Pc, where a UPS is meant to keep a PC running for a while so you can save your work or until the power comes back on. the thing is I'm not seeing anything for "USV".
A UPS would definitely be too big for this sort of thing, but a shutdown controller connected to the front panel connectors (ie momentary power button) and battery required to simply sustain an immediate shutdown event would not be very big at all. The only question is if there is a product or set of products that will make this possible or if I need to design my own circuit.
There are modules in the Car PC community that can provide such functionality. Here's an example:
This is a UPS that safely shuts down when the UPS battery runs low.
You can also use a Car PC shutdown controller: Quick Specifications
This uses an accessories wire to switch the PC on and off. I have used this in a mobile device with a NUC DE3815TYBE board.
Funny, I just found both of those devices today after doing more searching (like 4 hours worth!). The shutdown controller looks very promising but does not include power supply switching. The OpenUPS really looks like a slam dunk, although it's hard to tell whether that one or the picoUPS or DC DC converter (in UPS mode) is the best choice. At first glance the OpenUPS with a custom battery appears to be the best because it handles shutdown as well as telling the PC that it's running on battery which is convenient. I have an email into their support center asking which product to use.
I'll post back here with my findings as this seems like a very useful arrow to have in the quivver.
So what did you end up using?
It is possible to add a Consumer Infrared Rx Sensor to your NUC. You can turn your NUC off with a remote control such as, TVs.
Some compatible models are in the page below.
I was thinking about wiring a GPIO to send a shutdown signal coming from your "intelligent" battery