On 3/11/2025 7:46 AM, Greg Troxel via Nut-upsuser wrote:
Mike via Nut-upsuser <[email protected]> writes:
The new one is a Cyber Power CP1500AVRLCD3
Today I don't need a new UPS but I like to be ready.
Thus I have a few questions/comments, if you are inclined and of course
feel entirely free to not answer or to answer what you can without
effort.
It looks like this has a UL 1776 approval:
https://www.bhphotovideo.com/c/product/1751073-REG/cyberpower_cp1500avrlcd3_1500va_900w_line_interactive_lcd.html/specs
Is that right?
Yes, there is the UL seal on the label on the bottom of the UPS.
It is configured for 10 as battery.charge.low and 20 for warning. I
would be tempted to increase those to 20/40, depending on your real
goals. But I don't know how real they are anyway.
I am most concerned about safety, reliability, and runtime at around
100 VA, as I am thinking about router, switch and POE. (For desktops,
I'm ok with a plan of powering down once power has been out for a
minute.)
> Your load value is 12, and I'm guessing that's 12% of 900 VA
which is
108 VA.
108VA sounds abut right. It is powering two servers
It looks like this takes 2 batteries, 12V 9 Ah. Do you think that's
right?
I know it takes two batteries, I don't know their rating.
In theory that's 216 Wh as a 'not to exceed' value. The specs about
say 108 Vah (a typo for VAh, but that doesn't really make sense as VA
is an AC concept). Assuming 100 Wh usable from the battery (which I
guessed before finding the above specs), and 75% efficiency (?), this
should last maybe 45 minutes. Specs claim 12 minutes at half load.
The runtime shown by nut is 4750. Lots of conflicting information.
I have NUT configured to shut one server down after 10 minutes, the
other after 30 minutes, then NUT shuts down the UPS. So I don't run the
batteries longer than that.
Have you put a power meter on your load (to read VA and W) to check
the "12"?
I haven't checked the power draw with a wattmeter.
Have you done a simulated failure test to obtaind the
actual runtime, and even better to log the battery voltage and claimed
runtime during the rundown?
I have simulated failure, but only with the time constraints mentioned
above.
This is a little rough on the batteries
but my take is that if batteries aren't tested once a year, you really
don't know if they are ok, and once a year testing isn't what kills
them.
I (or the power company :) ) usually test the UPS a couple times a year.
It seems like the trend is to have more and more output power from the
same 2 medium batteries. (At work long ago I had an APC 1500 VA that
had 2 12V 18Ah batteries.) I wonder if the efficiency at 100 VA is
as ok as it used to be. To me "runtime at 100 VA" is the big thing,
but the specs are price and max power/VA.
Did you think about the sine-wave version CP1500PFCLCD?
Never looked at it.
Hope this helped.
_______________________________________________
Nut-upsuser mailing list
[email protected]
https://alioth-lists.debian.net/cgi-bin/mailman/listinfo/nut-upsuser
