A basic RV surge protector absorbs voltage spikes and usually tests the pedestal for wiring faults before you connect. An electrical management system (EMS) also watches voltage all the time and cuts power when it runs too high or too low, which protects air conditioners and electronics from brownouts. Buy one rated for your RV's amperage, compare joule ratings, and choose portable or hardwired.
Campground power is not always clean. Spikes, miswired pedestals and low voltage can damage an RV’s electrical system.
What each type does
| Feature | Surge protector | EMS |
|---|---|---|
| Absorbs surges | Yes | Yes |
| Checks pedestal wiring | Most models | Yes |
| Cuts power on high or low voltage | Usually not | Yes, continuously |
| Price | Lower | Higher |
Choose by amperage
Buy a 30 amp or 50 amp model to match your shore power cord. See 30 amp vs 50 amp RV service.
Portable vs hardwired
Portable units are simple and can be locked to the pedestal. Hardwired units sit inside the RV, out of the weather.
Related
Common questions
Do I need a surge protector for my RV?
Campground pedestals can be miswired or deliver low voltage. A surge protector or EMS is cheap insurance for your RV's electrical system.
What is a good joule rating for an RV surge protector?
Higher joule ratings absorb more energy before the protector wears out. Compare models of the same amperage.
Portable or hardwired?
Portable units plug in at the pedestal and move between rigs. Hardwired units install inside the RV and cannot be stolen from the post.