Low voltage warning (11.0V)

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rwineteer
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Low voltage warning (11.0V)

Mon Jul 18, 2016 10:55 am

I have a WS-12-250-DC which is running 1.4.2 final and yesterday it started reporting "Low voltage warning (11.0V)". This switch is powering 5 devices: 2 SAFs at 48VH, 3 Ubiquiti AC Rocket Lites at 24V. All devices are powered correctly and functioning properly.

Power supply input voltage is frozen at 10.7, and Power supply input current displays "NaN.undefined"


This location is in a remote area, and before doing a truck roll I'm wondering if this is a firmware issue with stat reporting, and not an actual power issue. This WS-12-250-DC has been rebooted, but the low voltage warning remains.


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sirhc
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Re: Low voltage warning (11.0V)

Mon Jul 18, 2016 11:20 am

Please post up the Main Status Tab showing all the ports and watts being used
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Re: Low voltage warning (11.0V)

Mon Jul 18, 2016 11:28 am

My guess is there is a bug in the firmware when the input voltage is dropping this low?

We will have to test this out.
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Re: Low voltage warning (11.0V)

Mon Jul 18, 2016 1:52 pm

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Re: Low voltage warning (11.0V)

Mon Jul 18, 2016 3:15 pm

Everything look right.

You will need to go on site and check the input voltage to see if it really is 10.7V which I think it maybe.

Then do a cold power cycle and see if that fixes it?

I am thinking there may be a bug creeping around somewhere current calculations and that is throwing the efficiency off as well?

Would be nice if you could get Eric remote access to it before you power cycle it?
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Re: Low voltage warning (11.0V)

Mon Jul 18, 2016 3:29 pm

I am curious why you run with such low voltage? Just because you can doesn't mean you should. There is not as many watts available at the bottom end of the range. Chris, maybe this should be better explained on the spec sheet?

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Re: Low voltage warning (11.0V)

Mon Jul 18, 2016 4:39 pm

The site is solar, and normally runs at 12V. It may very well be only getting 10.4V (it dropped from 10.7V), but I thought I'd check here first if anyone has experienced this before. It's a remote site, taking a few hours to get to, so we'll have to contact the site owner to see if they can determine the voltage to the netonix. I had the thought that since all the equipment being powered through the netonix weren't having any issues, that perhaps it was just a status reporting bug.

I did a "reload cold", but that didn't appear to actually power cycle the device. The gui reboot looks to be a warm reboot as well, is there a way to power cycle from the cli/gui, or will that require a physical reboot?

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Re: Low voltage warning (11.0V)

Mon Jul 18, 2016 4:53 pm

rwineteer wrote:The site is solar, and normally runs at 12V. It may very well be only getting 10.4V (it dropped from 10.7V), but I thought I'd check here first if anyone has experienced this before. It's a remote site, taking a few hours to get to, so we'll have to contact the site owner to see if they can determine the voltage to the netonix. I had the thought that since all the equipment being powered through the netonix weren't having any issues, that perhaps it was just a status reporting bug.

I did a "reload cold", but that didn't appear to actually power cycle the device. The gui reboot looks to be a warm reboot as well, is there a way to power cycle from the cli/gui, or will that require a physical reboot?


There is no way to do a COLD BOOT or Power Cycle from the UI or the CLI, that is a WARM boot or reload.

My guess is that your input voltage is 10.7V and there is a bug in the other fields. Obviously if the input current is wrong there is not way to calculate the efficiency so I understand why that is blank.

Will a power cycle fix it? - Maybe but there may also be a UI / reporting bug.

I would strongly suggest changing your site around to be 24V, at 9V-11V you only have 100 watts of POE power budget.

The system is much more efficient with 24V and 48V battery sites, the ability to drop down to 9V is more for "emergency" depth of discharge say on a cloudy couple days in the winter.

Can you run 12V sites? - YES but only recommended if your POE budget is SMALL and you only need one battery there. If you're going to have more than 1 battery your better to hook them in series.
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Re: Low voltage warning (11.0V)

Mon Jul 18, 2016 8:46 pm

"...at 9V-11V you only have 100 watts of POE power budget." and it's showing 134.8W just below the Christmas tree. That can't be good. Definitely be a good idea to have 24V+ to push that much PoE power.
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Re: Low voltage warning (11.0V)

Tue Jul 19, 2016 10:24 am

After a truck roll, turns out the issue was power on site. Thank you for the assistance, and the suggestions.

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