One of my customers is having an issue I'm unable to fix, where the Quattro makes a very loud and uncomfortable noise but only when running a Brava oven. This noise is also noticeable as physical vibration on the AC wires, and transfers an audible noise to other components on the same circuit even if they're switched off (the induction cooktop would hum at a similar frequency). The Multiplus makes the same noise with that oven, but I don't know for sure if the noise transferred in that setup. Since I've isolated the issue as only occurring with the Brava and Victron inverters, I'm thinking it's not simply an issue with one or the other but an issue with how they interact.
The oven is only around 1500W, which is well within what either inverter can supply, and this problem doesn't occur on other brands of inverter with this oven (we've tested with Cotek and it runs perfectly fine). I've verified all connections are secure, the problem persists through any settings changes I thought might affect it, and the inverter should be on the latest firmware (which I can verify if needed). Wire is sized larger than required to supply the load too, so there's no obvious supply or delivery bottleneck. Readings from the app track with that, both AC and DC voltage are what I'd expect when under load and neither dips to any significant degree.
I don't think it's a fan issue or anything mechanical, by holding a strong magnet near the wire I could feel the same vibration without physical contact which implies to me it's electrical. My best guess is it's some sort of harmonic interaction between the Victron inverters and the Brava, but I'm at a total loss as to what to do about it. My experience is mostly in DC power so maybe I'm just overlooking something, power factor issues perhaps? Anyone have any ideas? I'm happy to provide additional information or clarification, I've been working with Victron components for years and I don't think I've ever been this stumped so I'd love to understand what's happening even if there isn't a fix.
Thank you for your time,
John.
