We’re in rural CA with frequent outages. We have tesla powerwalls to backup. When the powerwalls are 100% and the grid fails, they produce 65hz to tell the micro inverters te shut off as there is no place to send surplus.( Enphase newest tech has a better way to manage this but we have powerwalls.) i’m concerned how 65hz can damage delicate electronics before I realize the issue and shut down and am looking at Eaton Lithium-Ion UPS 1350W 120V Double-Conversion UPS. This would maintain 60hz but would be running constantly and creating heat. I would keep my cheap power conditioner downstream. Anyone have thoughts on this?