BFL13 wrote:
Maybe you just have to vacuum out the compartment the lower portion is in behind that vent.
Our 7355 has been doing ok for ten years now and it does not make funny noises.
If it ever did and I wanted to replace it, I would consider some others besides the PD with Charge Wizard. EG PowerMax has some to consider, and so do the other brands. PD might still end up being the right one for you in your scenario, but do look at the whole field first.
I thought about vacuuming too, but the noise is an electrical noise, like a resistor is about to blow up. Perhaps it's not a fault, but it's still anoiying.
I think about getting a solar Panel. Are there Converters where I can attach a solar Panel, perhaps I am doing some Googling about it.