He was a salesman and his lips were moving, make your own decision....I suppose he also sells PSW inverters.......
I run all kinds of electronics and power appliances, including a coffee maker, 2 LCD TVs, surround sound system and electric mattress pad on a very high quality, well regulated MSW 2.5kw inverter and have never had a problem or seen an early failure. My personal opinion is that he was a salesman with his lips moving.
Bob & Betsy(FishNFanatic) - USN Aviation Ret'd '78 & LEO Ret'd '03 & "Oath Keeper Forever" '05 HR Endeavor 40PRQ, 400 Cummins-Pulling our '11 Silverado LT, Ex Cab 6.2L NHT 4x4, w/2010 Rzr or 01 V Star in back. Where the wheels are stopped today
...Sorry to say but this is one area, where you get what you pay for. Low price, low quality.
I am learning this through trial and error for sure. MSW inverters are attractive BECAUSE they are inexpensive. If the lesson is to not skimp and buy a nicer more expensive unit, then my opinion is to skip MSW altogether and invest in a pure sine wave one.
I still couldn't help myself and went with budget PSW inverters and the same "get what you pay for" rule applied. Thankfully the 300 watt PSW unit works flawlessly with my TV. Unfortunately the 1000 watt PSW unit performs better than the MSW units I've tried but not as well as the 300 watt PSW unit. The 1000 watt unit creates a quieter buzz from the TV, but nowhere near as bad as with the different MSW inverters I've hooked up to it.
Samlex builds or imports everything from junk, to very high end inverters. You have to know what you are getting, to know where it stands in their lineup. One thing that folks need to know, is an appliance drawing 100w can NOT be used on a 100w inverter, or even a 125w inverter.
Sorry to say but this is one area, where you get what you pay for. Low price, low quality.
Xantrex used to have a document on their MSW inverter support pages titled something like "Things that may not work right on MSW inverters".
Those are the key words, used to have, plus the Xantrex reputation. Back in the beginning, a "modified square wave" was just that, a poorly regulated attempt at making it useful. However, today with the technology that is available, a MSW can be and in high end inverters, is very close to what a PSW was back then. There are still poor imitations being sold and some manufacturers have a less than stellar reputation, but if you have a high quality late model MSW inverter, you will not have any problem with 99% of the electrical or electronics that you will normally encounter in an RV.
A high quality MSW inverter, like the Magnum RV series, will work 99% of the time and even though they are expensive, they are still much less than the same quality PSW Magnum inverter. We just upgraded our 2kw inverter to a 2.5kw, because we are going with a residential fridge, but I saw no reason to spring for a PSW at $2000, when the Magnum MSW has worked well and I found a factory remanufactured MSW for a very good price. Magnum has engineered their MSW to very tight tolerances and the sine wave is not anywhere near as dirty as other MSWs.