There is always risk with anything electrical. Even when everything is plugged into the wall there are power surges and lightning strikes that can overwhelm any audio system. One reason I use a Shunyata power conditioner is because it has an electrical breaker built in to mitigate surges. Regarding the inverter, in my almost two years of going off grid, none of my audio equipment was ever damaged. I did however manage to damage the inverter and the battery charger. For the Giandel inverter, one should never plug and unplug equipment with the inverter on. I think I damaged it by doing this in a moment of haste. I was able to get a new 5000W inverter under warranty. I now always power all components off, then the conditioner, then the inverter, when I need to reconfigure the AC setup. Giandel they actually say to remove the positive cable from the battery. After making the change, I would power on the inverter first and then verify the AC voltage is back to 120V (US) before I power on the conditioner or any component. Regarding the Progressive Dynamic battery charger, I must’ve crossed the polarities at some point because the reverse polarity fuses blew. Fortunately, the fix was simply replacing the fuses which is not costly. The Ampertime battery has been very solid this whole time. It always runs cool.
For what it's worth, here is a listing of features under "Safety and Stability" from the Giandel website:
- Isolated Input/Output Design
- Soft Start Tech
- Over Voltage
- Low Voltage
- Overload
- Short Circuit
- Overheat
- Polarity Reverse Protection (Fuse)