I'm considering Zooz ZEN15 switches on some equipment that is turned on periodically (once or twice a month) and the ZEN15 will not have power supplied to it when not in use. This is being used mainly for power monitoring more than anything else.
How long can an included Z-Wave device remain without power (think a switch that's not plugged in) and non-responsive/reporting to the hub before it causes problems to the mesh when it is eventually powered back up?
Thank you.
A recent post in the Hubitat Facebook group by BobbyD recommended not doing this (removing powered Z-Wave nodes from the grid) at all. 
So, your luck may vary, but I'd be hesitant to do something Support doesn't recommend. That being said, any problems you'd notice are far more likely to happen when the device is offline than after you plug it back in. If you're manually unplugging the device, you might consider just leaving it plugged in nearby somewhere else instead to avoid this. If it's on a circuit where power is being cut to it and you're just trying to monitor whether that circuit itself turned on, you might want to look into another solution, though I don't have advice for that off the top of my head.
@bertabcd1234 - thanks for the insight and the response. I figured this would be the direction the question would go, especially considering the fairly unique situation I am asking about.
I’m going to change my plans and monitor this equipment in another fashion. I was really wanting to see power reports for when the equipment was active without the hassle of swapping plugs/switches just to keep Z-Wave happy. Trust me - I want a good working mesh there and don’t want to mess it up!
I’ll likely look into a WiFi-based solution that can tolerate being powered off since those are all point-to-point anyways and should be able to withstand being powered off for indefinite periods.
Any reason you can't leave the ZEN15 plugged in with the switch off? It will still be on your z-wave network that way.
This! I have that configuration for an outdoor pump in our exterior basement stairwell. Turns out the "drain" in the floor of the stairwell was just a hole that likes to fill up and flood into our basement. As a temp fix added a float pump in the hole and hooked up a Zen15 to monitor the power. I get alerted every time it starts/stops. Has been working for a few months so far. I used to have Zooz's other discontinued model but burned it out because I don't like to read or pay attention to specs apparently.
Yeah - there aren’t many plug-in outlets that can handle a high current inrush.
Aeotec used to make a zwave plug that I use to control a couple of laser printers, which have a similar high inrush on startup.
BTW - @erktrek - Happy Holidays and best wishes for 2021!
You too!!! 
@aaiyar - Good question, and I probably should have included that information. Main reason why I do not is that the equipment in question that I'm monitoring is pretty expensive, and I live in a rural area and do not want to chance leaving them plugged in when not in use with the only protection from surges/etc. being the Zooz. I'm in the process of getting a whole-home surge suppressor installed, and I'll feel better about leaving the equipment plugged in after that.
But for now, it's better insurance to just not.
You could still leave zen plugged in, but unplug the equipment from the zen .....
But in any event, great decision on the whole home surge protector.
@aaiyar - I could, but then I'd have to crawl under each of them (they are pinball machines) every time I wanted to turn them on - not happening.
or maybe extension cords and a power strip or two? Then you could simply turn off the strip rather than unplugging everything.
Also there is this device:
@erktrek - Now THAT looks nice. I'm going to pick one of those up and wire it to control our pool pump. Thanks for the heads up there, as it looks like a good solution for the heavy-duty workloads!
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