RS1000 does whistle my supply

[BillP]

Hi everybody,

I'm worried about my new APC RS1000va. She does whistle my power supply when i'm on battery (Supply is a Seasonic SII 2 500w). Before i had an 500CS and i never heard my supply whistle at this point (only a very little, not much). Is it normal ? There is a problem with the 1000va ?

Thanks in advance !

[BillP · Accepted solution]

Hi everybody,

I'm worried about my new APC RS1000va. She does whistle my power supply when i'm on battery (Supply is a Seasonic SII 2 500w). Before i had an 500CS and i never heard my supply whistle at this point (only a very little, not much). Is it normal ? There is a problem with the 1000va ?

Thanks in advance !