A lot of what said about MSW inverters harming or causing failures in digital controlled inems: Heated blankets, mattress pads, heating pads, cell phone chargers, laptops and charging bricks, our JetPack WIFI charger, radios including our expensive Bose radio/CD player, TV's, microwaves, etc to name a few is pure bunk! Many of our friends having MSW inverters will tell you it's bunk also.
I/we've been using MSW inverters in our cabined boats and over a dozen different RV's, and other places since the early 1980's with our first inverter (the Heart Interface 1800W inverter) and have NEVER had one item used on them fail yet or fail to work properly. Thousands of hours on our MSW inverters and still using them as I have a 300W, 2-400W, 2-700W, a 1000W, a 1500W, a 2000W, and a 2500W MSW inverters (all MSW) we use a lot in various places, boats, RV's. The 1500W is installed (mounted) in the Lance TC and the 2500W is installed (mounted) in the Carrilite 5th wheel. One electric blanket was used 21 years on the MSW and still working fine but the fabric was getting frayed. So we replaced it with a digital controlled electric blanket on the same MSW inverter 6 years ago and it still works fine today. Have 4 other heated blankets and heated mattress pads plus 2 heating pads all with digital controls and all are working fine on our MSW inverters.
30+ years now of using many MSW inverters with NO failures sure says something good!