Annoying PWM sound from Xantrex inverter
I finally got my Xantrex ProWatt SW 2000 installed into my rig. Functionally, everything seems great. I can run the hair dryer (on 800W setting anyway) and microwave at the same time. I finished...
Forum Discussion
Gerald55 wrote:
the sound occurs when my PWM solar controller (Samlex 30A) goes into current limiting mode (i.e,. absorption aka CV stage) the noise starts. The controller uses PWM at this stage and it seems that the fluctuating voltage/current causes some kind of resonance in the inverter.
There are no voltage fluctuations in my MPPT at this stage - if sun is shining steadily. It goes into Absorb and stays there until conditions for transitioning to Float are met. Current is gradually tapering during this stage. It never makes any sounds other than soft click when switching between bulk/absorb/float.
Gerald55 wrote:
I'm not entirely sure if this is normal, but I'm certainly loathe to try to send this guy away for repair.
It's worth noting that when I turn on the dimmable lights in the coach, I can also hear the PWM noise
Probably normal for this model/brand.
Gerald55 wrote:
Any ideas to get rid of the noise?
Get a quality controller. RF issues that Mr Wiz mentioned could take place too, you may play with wiring to see if it helps, but like I said I never hear any sounds from my controller.
