Samlex America SAM-800-12 800W Modified Sine Wave Power Inverter - 12V DC to 110V AC Converter for RVs, Boats, Camping & Emergency Power Backup (Blue)

I bought this inverter to run AC power off the DC batteries in our travel trailer (TT) while camping off grid. My plan was to just plug the TT's shore power cable into this inverter (TT's onboard AC-to-DC converter turned off) and then all the interior AC outlets would be live. Well the inverter would shut down and the fault light would come on as soon as I plugged the shore power cable into it. Did some troubleshooting and research and found in the manual it says to not plug it into an AC distribution panel or it faults. This is basically exactly what I was trying to do with it, bummer. I confirmed that using an inverter in this manner does work fine with a borrowed smaller modified sine wave (MSW) inverter and it had no issues.So I thought I could at least use this Samlex to provide AC power to the LCD TV, but the TV must hate the modified sine wave power because it makes a terrible buzzing sound. Totally unacceptable and I think it would have killed the TV eventually if I had continued to use it. I now use a small pure sine wave (PSW) inverter to plug the TT shore power cord into and it works great. All the AC outlets are live. No faults and no buzz from the TV, either.So this inverter now sits in the truck tool box in case of emergency. I don't think I can give this Samlex MSW inverter a bad review since I was trying to use it in a manner that it says not to. Plus the whole MSW/PSW thing is a risk you take if you want to try using a less expensive inverter to meet your needs. So I've settled on 3 stars because I'm sure it does what it is designed to do, it just didn't do what I needed it to do.