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We have the portable 50-amp and the 30-amp Surge Guards. The reason for having both: we started with the 30-amp when we had a small pull trailer that only called for 30-amp service. Now we use which ever one for the power we are connecting to. You can use either one down to 20-amp service, with the proper adapters. We will not hook up to any power source without one of the units connected.
I queried the company about usage of the portable Surge Guards as to installation needing to be vertical. Their answer to me is that if your power source is to close to the ground such that the Surge Guard cannot remain vertical, it is all right to lay it down, face down and cover it with something like a Wal-Mart bag. So that is what we do. I assume it needs to be face down so that moisture cannot seep into the unit.
Both of our units have paid for themselves in preventing power surges from causing damage to the RV. It's good insurance.
Orv
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