Re: Newbie confused by the various surge protectors I always plugged in a little polarity/continuity checker I picked up when I first stated Rving before hooking up to the RV Park shore power. Every once in a while I would find the shore power wired wrong or not grounded. If the RV park power checked out OK, I would then use 30 amp surge protector ($80) plugged into the shore power at the outlet. I then monitored the voltage from inside the RV with a voltage monitor plugged into a ac outlet inside the RV. If the shore power varied very much or was low to begin with, I hooked up my Hughes Autoformer to keep my voltage in the safe zone (above 105 V ac). Never had any problem in 15 years following these procedures. My air conditioner compressor never prematurely failed due to low voltage because I used the Autoformer. Don't leave home without one.