I bought this unit in July 2015 for use in an amateur radio salon. It powers several low current DC devices as well as an ICOM-7000 transceiver that requires 20A DC. I used it to power a Blue Sea Systems ST fuse box. To be honest I installed it out of sight at my desk and I never hear the fan or any squeaking from it. Has been working 24/7 for two years with no problems. This gives me a constant DC current with no ripple at 13.4 volts and no RFI.