The output waveform shifts greatly as the load increases but it basically always remains a two-step square wave. The peak-to-peak voltage of this waveform is over 1000 V due to these peaks but they are too short to cause any kind of damage.īattery Output Waveform - 50% load (left) / 100% load (right)Īs is the case with such designs, the circuitry of the CyberPower ValuePro VP1600ELCD 1600 VA adjusts the timing of the MOSFETS to maintain a stable output. There is a momentary peak at the front of the second step, which is extremely high but also very short. It does not even resemble a sinewave – it is but a two-step square wave that ultimately produces a 230 V RMS output. Depending on the manufacturer and cost of the product, designers will make the corresponding effort to simulate a true sine wave as much as possible.Īs expected from a UPS at this price point and with such a high power output, the output quality while on battery backup is quite poor. The better the circuitry design, the more the steps, thus the better the approximation to a true sine wave output. This approximation typically is a ladder wave with a few steps. What that means is that the output will not be close to the standard sine wave that we receive from grid, but an approximation of it. The CyberPower ValuePro VP1600ELCD 1600 VA is a unit with a “modified sine wave” output. These figures are achieved with the batteries fully charged while they are still brand new. These times are great considering the UPS also lacks any active cooling. In theory, the UPS can hold a lightly loaded typical PC for over than half an hour. The runtime is well over two hours with a load of 50 Watts, a little over 10 minutes with a load of 500 Watts, and slightly less than 2 minutes with the UPS fully loaded. Our load testing reveals that CyberPower’s running charts are quite accurate. There are minor frequency variations but these are exceptionally small. The RMS voltage and frequency output look to be extremely close to the expected 230V/50Hz output. The transfer times are exceptional, with the unit requiring less than 4 ms to switch while fully loaded. I tested the above by unplugging the UPS and after 1 minute, proxmox shutdown.The basic electrical figures of the CyberPower ValuePro VP1600ELCD 1600 VA UPS are quite good – unexpectedly so, in fact. Pwrstat -lowbatt -runtime 300 -capacity 35 -active on -cmd /etc/pwrstatd-lowbatt.sh -duration 1 -shutdown on You can also do a shutdown for low battery like this (This is set for when you have less than 5 minutes of battery time remaining but you can adjust that by changing the 300 seconds to something else if you like): Pwrstat -pwrfail -delay 60 -active on -cmd /etc/pwrstatd-powerfail.sh -duration 1 -shutdown on For me personally, this was a much better solution than NUT (although if I end up with a setup in the future with multiple servers connected to the same UPS - or something else requiring different commands being sent to different machines, I can see why I would use NUT in that case.)Īfter you get the install set up from my post above, here is how you set up graceful shutdowns for power failures (mine is currently set up for a shutdown after 1 minute, but I might change it to 5 minutes by changing the delay from 60 to 300): Ok I configured the graceful shutdown and it worked perfectly.
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