Great explanation on the IRV2 forum of the technical reality of modified sign wave limitations, warrantee issues with appliances damaged by them and acknowledgement by Thor of the issue and Thor covering the replacement of the mod sign inverter to pure sign under warranty.
Since i already replaced mine myself, Thor is reimbursing me their cost of the original ME2012.
Read post #21 and beyond by MSTURTZ -
Microwave Humming While on Inverter - Page 2 - iRV2 Forums