Post in thread 'Domestic - Voltage fluctuations on a 1000VA 600W UPS with 40% load when on battery' by kuddoo has been reported by kuddoo. Reason given:
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Thank you for your time and thorough answer. It is informative and I really appreciate it. Although I'm no electrical engineer, I believe I overall understand what you said.There are typically three types of UPS: on line, off line or interactive. In an On Line the mains chargers a battery and the battery powers and inverter - there is next to no interruption in power output if the UPS switches over to battery mode. In Off Line the mains powers the inverter directly and a mains battery charger maintains the battery - in the event of a power outage the inverter switches over its power supply from mains to battery by a very fast switch - the interruption is brief but there is one. (Sometimes the mains powers the output directly, charges the battery and the battery powers the inverter constantly - but the switch over happens between the mains and the output of the inverter).
Now to the Interactive type. See my attached diagram. The Interactive is simialr to the On line with the addition of a 'mains conditioner box C' between the mains and the battery charger and inverter BCI. The output is generated by the inverter not the mains. The output voltage V is monitored (circuitry in red) and regulation within limits is achieved first by 'raising or lowering' the mains voltage using the circuitry within C. When the regulated voltage output can no longer be achieved using the Conditioner the inverter switches to the battery for its power input. Now the Regulation R will control the BCI to maintain V stable - within limits though. The interactive scheme tends to stay connected to the mains if it can thereby reducing discharging the battery.
The mains has much higher amperage available for short periods than is available the battery. It has a lower source impedance than the battery. And being a much higher voltage than the battery the power required by the load is delivered by a lower current than from the battery, remembering power P is V x I Watts. eg: 360W PS% at 240V ac requires a current of 1.5Amps but in battery mode (assuming a 24V battery) the current is 15Amps.
What perhaps you don't know is that a PS5 consumes power depoending on how much processing it is required to do - its processing rate. If all the PS5 had to do was display a red screen on the VDU the processing rate is very low. During a game you will well know that there is a very high rate of change of imagery and the computing to calculate the games logic and physics and thence generate the imagery. A PS5 power consumption of say 360W is a time average amount - in reality there are times when the PS5 is consuming much much more power - you will notice this as the fans turn on/speed up to keep the computer processor and memory cool.
I think then without going on too much that the problem is that the UPS you have bought has inadequate peak power handling capability to suit the PS5. For reliable functioning the VA will need to be much higher than 1000. Look at the prices for the maximum VA UPS you can plug in and then send me details of it/them.
Meanwhile do a test.
1. Power the PS5 and VDU from the UPS and the mains but with the PS5 displaying a very simple graphic say a plain screen with nothing showing or a plain colour screen. Connect a voltmeter (safely) to the UPS output.
2. Now unplug the/turn off the mains input. What happens to the output voltage please - is it steady? It maybe slightly lower than when run from the mains.
Items like the PS5 also have a non-linear relationship between the input voltage to them and the current they draw. AS the voltage reduces the current increases over some voltage range and in other ranges the current increased at a slower rate than the rate of increase of voltage and in other regions the current increased at a higher rate than the change of voltage. This V and I relationship can scupper the voltage regulation R is attempting to do.
Anyway, those are my thoughts.Or something along these lines.....
PS: The VR box is a voltage reference to compare V with.
I've run a few tests and these are the results:
PS5 in menu (idle) - on battery - voltage is rather stable at 230v-235v
PS5 in games (full load) - on battery - voltage fluctuates rapidly between 180-290v
PS5 in games or in menu - on mains - voltage is a solid 232v
Powerful desktop PC in games or 3D rendering (peaks at 350w) - on battery - voltage is rather stable at 232v-236v
PS5 power-supply rated at 350W and 220-250v. Peak watts dawn from the power outlet was at 200W.
My multimeter is broken so the voltages were measured via the UPS front display and with a laptop (through software) connected to the USB port of the UPS. Wattage was measured using a smart plug that measures the energy output instantly and over time.
Sorry if my English sucks; i'm not a native speaker.
