Currently in Asheville, NC at Bear Creek CG, and it has been hot. Every unit in the park seems to have their AC running, and one diesel pusher had 2 units going. All of a sudden all 120V power was gone. I checked my Progressive Industries EMS, PT50C, and saw a code for low voltage. I felt good about the EMS working as expected. It protected our BH from possible electrical damage. The EMS was well worth the investment, and now DW understands why it was needed. One does not know when an electrical problem will raise its ugly head, but you have to be ready. If you are thinking about protecting your unit with an EMS, check out www.progressiveindustries.net.