I get a lot of summer storms here in South Florida, with power flashes. Can someone with knowledge of such things advise on what size battery back up would be needed for the Nomad 3?
Thank you!
I would recommend getting something that uses a true sine wave output vs the less expensive stepped sine wave. I use an APC Smart-UPS on my SO3, and here is a video from a few years ago where I had it running and just pulled the plug on the UPS, and the SO3 didnât even notice. I was in the middle of changing out the router, so it is just sitting on the deck, but it is a good demonstration none-the-less.
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Iâve seen people note that they use a UPS, but if the have a black-out, theyâll pause the job. Not running a spindle greatly reduces power consumption and lets the UPS last much longer. Then restart when power is back up.
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I would think a UPS should be used to allow a safe shut down/pause, to prevent an instant stop.
Continuing with a project would probably drain the backup batteries quite quickly - unless youâre prepared to pay a lot of money!
Also, there could be safety issues if, for example, youâre plunged into darkness and thereâs a scary machine out there, waiting to bite you 
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Some of the APC UPS units have a âpower fail signalâ which might be suitable as a pause button feed into the ShapeOKOâs board - if the power fails, the job will automatically pause, then wait (even after power is resumed) for you to click in CM to resume
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What size backup is needed to handle the Nomad 3?
Runtime and VA (Power) rating will govern the size of UPS. Keeping the spindle going to complete a job will be the major draw. A typical âhome use UPSâ for a PC assumes 20-30 mins for a 200w PC draw. Divide this by say 5 to keep the PC and Spindle and Steppers going, and you can probably multiple the price by 5-10. Without looking up models, I would think north of $1000 is likely
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I am lucky to live in a tech heavy area (greater Seattle area) and I have purchased 3 of the APC Smart-UPS 1500 units from Craigslist / Offerup for $75-150 each because the batteries are dead. Some people or small businesses just donât want to deal with that, so they buy a new one and sell the old one for cheap just to âmake it go awayâ without having to deal with recycling the batteries. Another $100ish in batteries and they are good to go. I buy regular 12V 15-17AH batteries instead of the âcartridgeâ and save ~$50 by just moving the wire harness and fusible link to the new set of batteries.
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As was suggested, what I need is enough power to allow me to turn off the spindle until power goes back on. 9 out of 10 times it is just a momentary power outage, just donât want to lose the carves⌠Do you think a 1500 would keep the Nomad 3 running for a few minutes?
I would think so, yes
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Be sure to get a quality one. Motor coils knock voltage and current out of phase. This can cause cheap UPSs to freak out.
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