Campground power is not clean power — it never has been. High voltage spikes, low voltage brownouts, open neutrals, and reverse polarity are all common at RV park pedestals. Here's what an EMS does and why a basic surge protector isn't enough.
Campground power is not clean power. It never has been. The pedestal you plug into at an RV park has been used and abused by hundreds of rigs, in all weather, with wiring that hasn't been inspected in years. When you plug your $80,000 rig into that pedestal without any protection, you're gambling every appliance and circuit in your coach on the hope that the power coming out of that box is stable.
It often isn't. Here's what you're actually exposed to — and the one device that stops all of it.
What Bad Campground Power Does to Your RV
The two main threats are power surges and low voltage — and both can cause serious damage. A surge is a spike in voltage that exceeds what your appliances are designed to handle. Low voltage (also called "brownout" conditions) is the opposite: sustained voltage below spec that causes motors and compressors to work harder than they should, overheating and failing prematurely.
- AC compressor burned out from sustained low voltage — $900–$2,200 to replace
- Converter or inverter/charger fried by a voltage spike — $300–$800
- Refrigerator control board failed after power event — $200–$600
- TV, microwave, and entertainment system killed in a single surge
- Battery bank damaged by charging irregularities from bad power
- Wiring damage from repeated low-voltage events — expensive and hard to trace
It's not just old campgrounds
Brand-new RV parks can have pedestal wiring problems. A single previous camper who ran an undersized generator through the hookup, a loose neutral connection, or a failed breaker at the panel — any of it can result in bad power at your site. The pedestal looking clean and new tells you nothing about the power coming out of it.
EMS vs. Basic Surge Protector — Know the Difference
There are two categories of protection, and they are not the same thing.
A basic surge protector is a plug-in device that absorbs and clamps voltage spikes. It handles the surge problem but does nothing about low voltage, miswired pedestals, open ground, or reverse polarity — all of which are common and all of which can damage your rig.
An EMS (Electrical Management System) monitors the incoming power continuously and disconnects your coach if any parameter falls outside safe limits: high voltage, low voltage, open neutral, open ground, reverse polarity. When power normalizes, it reconnects automatically after a short delay. This is what actually protects your investment.
- Basic surge protector: $30–$80. Handles surges only.
- Portable EMS: $150–$300. Full protection, plug-in, works at any campsite.
- Hardwired EMS: $250–$500 (plus installation). Permanent, more reliable, can't be stolen.
30-Amp vs. 50-Amp — Get the Right One
This is a common mistake. Your EMS must match your RV's shore power connection. A 30-amp RV needs a 30-amp EMS. A 50-amp RV (most Class A motorhomes and large fifth wheels) needs a 50-amp unit. They are not interchangeable.
Our Recommendation
If you camp at commercial RV parks even a few times a year, get an EMS — not a basic surge protector. The most popular and trusted brands are Progressive Industries and Southwire Surge Guard. Either portable or hardwired will do the job. If you want a hardwired unit installed professionally so it's always in-line and protected from theft, we can do that on-site anywhere in Northern California.
Common Question
Can you install a hardwired EMS in my RV?
Yes. We install hardwired electrical management systems on-site at your location — campsite, driveway, or storage yard. The unit goes in-line between your shore power inlet and your main distribution panel, so it's always active and can't walk away from your campsite. Call us for a quote — it's a straightforward job for most RV types.
If your RV took a hit from bad campground power and something isn't working right, give us a call. We diagnose electrical issues on-site throughout Redding, Shasta County, and all of Northern California. Learn more about our RV electrical repair service.
BossBros RV Team
Redding, CA