3DPrinting
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Didn't think about noise and that's important to me so thanks, is there anything special to look for the battery to make sure it can support my 3 devices at the same time? Like amp or other electric specifications?
Look for devices, and read their specification sheets. They will tell you how much wattage they can support and how long they can support it for. They might do it in different units you can convert to wattage.
Do you need your devices to stay on for prolonged periods of time off the battery? Or just long enough to shut down? That will have a huge impact on how expensive your UPS will be.
You can add up the wattage of all of your devices, and see what the maximum is. Or you can get a $3 power meter and measure it empirically. Most UPS's will set off an alarm if you're drawing more power than they could support if they had to switch to the battery
Power outages are usually very short (few seconds max). Are fanless ups ok or should I stay away from it. The one I'm looking out at the moment is Eaton Ellipse eco 500
If you only need it to skip the power outage, I would look at something in the range of 800W to 1000W in an online ups.
This wattage should run your devices for 5 minutes or so, as you have quoted them. The online UPS will always run its load off on the battery, so there is no swap over time. Other types will be fine for a PC or normal electronics, but the hitch in power could cause a defect in the 3D print.
Thanks
Fanless is great, they are quiet.
Usually the fanless ones have power power restrictions, or only kick in when the power goes off
A note on noise in case there is some misunderstanding.
The UPS is silent during normal operation (at least, all of them I've ever seen are, maybe super heavy duty ones will have a cooling fan but I've never seen one and even that can't be too loud), the only time it will make noise is when the power goes out and it switches to battery or if you are pulling too much power to keep the battery fully charged it will beep to warn you.
If you are expecting a few outages that last a few seconds, you probably don't need the beep warning, so as the other person said a mute option would be nice as the beep is usually very loud, my first UPS did not have this option so I just opened it and cut the lead to the speaker..
I will look for a fanless ups as I'm kinda sensitive to noise and everything is setup in my living room..., I will make sure I have the mute option available.
Another small note regarding fans, I've never actually seen a UPS with a fan before I just figured there's probably some out there, if you're looking at something and it doesn't say anything about being fanless or silent or anything I'd just assume it doesn't have a fan.