Two years ago when we upgraded from a 1975 coach to a 2003, we installed the Progressive EMS unit. Yes, there was a learning curve, but we use it all the time in every country.
At times, it cycles off, then on. Sometimes the power is too high to get power. There are ways around this without turning the unit off. If there are two plugs at the post, we plug in a blow dryer, and with that on, if the power is too high, that will usually bring it down enough to get our roof air on, and then we are fine. The most common thing we see if the power being too high. Once that air conditioner is on, it's pulled down enough to run until we turn the air off. If there are not two plugs, we use our "Y" We built a 15 amp plug into our 15 to 30amp connector. If the power is too high, we plug the blow dryer into the extension 15 amp plug, turn it on, and that will bring down the power.
When parked for an extended period last year, the power was really high, so the air kept cycling on and off. We were in a hot area and have pets. We hard wired our air to an 80 foot extension core (yes, heavy enough) and just ran that directly to the plug, bypassing the EMS. Was this wise? Well, it worked for 4 months, and the air survived. We'll do that again this winter, if necessary. The area has been rewired, with new transformers, and the word is that the power is pretty stable now.
We make our living on line, so have very high end computers on all the time. Along with the electronics in the coach, we can't afford to take a chance on bad electric. The EMS has kept us totally protected. It may be a little inconvenient sometimes, but we feel it's worth it. Plus, every year the power in Mexico is improving.
