RV Electricity – Surge Protector Evaluation

Hi Mike,
Your articles in the No~Shock~Zone are outstanding. Thank you for caring enough to share and help people like me stay safe as we head out on our first travel trailer/4000-mile/27-stop retirement trip. Boy, we really could be in trouble without the electrical know-how you have shared.

We purchased a TRC Surge Guard RV Power Protection Model 34730 120-Volt / 30-Amp unit online for our R•pod 177. My question is: Is this going to take care of “surge” and electrical management or should we return and get something else? Thank you for your reply. —Linda Moon

Dear Linda,
Thanks for your kind words. It really does make me feel good that I’m helping people, so keep those questions and comments coming. To answer your question I’m going to show you how I deconstruct the spec sheet on a piece of gear to determine if it will do the job. So let’s look at a Surge Guard 34730 and see what it’s about.

First of all, I try to go directly to the manufacturer’s website for the most accurate and relevant information. While Amazon and eBay can give you a good overview, and the comments can be helpful, many times there’s inaccurate information that could bias me in the wrong direction. So I always go to the source. Here’s what I found out about your Surge Guard 34730:

• Protects RV from faulty park power
• Built-in intelligence
• Automatic reset on power restoration
• Shuts off power when the following is present:
  • Open neutral
  • Low (<102V) and High (>132V) Voltage
• LCD display (English)
• Multi-mode surge suppression
• 128 second reset delay protects A/C compressor
• Continuously monitors for:
  • Voltage and amp draw (RMS)
  • Reverse polarity (miswired pedestal, elevated ground voltage)
• 2450 Joules of power surge protection
• Convenient plug disconnect handles
• Weather resistant

So a quick glance tells me it has the ability to disconnect your RV if the incoming voltage gets too high or too low. This qualifies it as a “Smart” Surge Protector. Secondly, it has an LCD display rather than just a few blinking lights. Again, that’s a good thing for troubleshooting the power from the pedestal. And finally, it does include an actual “surge protector” with 2450 Joules of surge protection. That’s actually a measure of how much “surge” energy it can absorb so as not to pass it into your RV’s electrical system. However, I really don’t like the word “surge” as it’s actually more of a “spike” on an oscilloscope, but that’s what the industry has chosen to call it. Still, 2450 Joules of energy absorption should be sufficient for anything except for a direct hit with lightning, and in that case NOTHING will protect your electrical system. That’s why I say it’s always best to unplug from shore power if you’re in an electrical storm.

Now to your question at hand. Is this a good choice that will take care of your surge and electrical management needs? I would say yes, but maybe it’s not the best choice. That’s because on the Surge Guard website I found that it’s a discontinued model. The replacement is the Surge Guard 34830, which appears identical on the outside, but includes more complex electronics on the inside plus a few additional features, specifically the following:

• NEW! Surge Failure
• Voltage and amp draw (RMS)
• Reverse polarity (miswired pedestal, elevated ground voltage)

I do like the ability to monitor RMS amperage draw in addition to voltage. And apparently it will indicate if there was a surge failure while you’re away. That could be a great warning to check your refrigerator for spoilage if there was an extended outage. Also, while I was discussing this with tech support I found out that the 34830 also includes an over-temp monitor in the plugs themselves. So if there’s a poor connection that causes the plug to overheat to above 200 degrees, it will also shut down. And finally the 34830 includes a limited lifetime warranty, while the 34730 has a 1 year limited warranty. So I would consider the Surge Guard 34830 to be a better choice if you’re purchasing one right now. However, your 34730 is still a great choice and won’t let you down.

What you should take away from this is to always go to the manufacturer’s website for the most up-to-date information. Sometimes products on Amazon and eBay may not be the latest offered, and thus you may be missing an important feature or upgrade.

So, have a great trip. And let’s play safe out there….

Mike Sokol

Mike Sokol is an electrical and professional sound expert with 40 years in the industry. Visit NoShockZone.org for more electrical safety tips. His excellent book RV Electrical Safety is available at Amazon.com. For more info on Mike’s qualifications as an electrical expert, click here.

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