Low Shore Voltage

myredracer wrote:
Low voltage is probably enemy no. 1 for RV-ers because it can cause appliances & components to under-perform and in some cases cause damage. Learning about it and knowing what you can do about it is a very good idea.

Not to disagree that excessively low incoming source voltage is a very real and present danger more often than many would realize BUT I'd say water leakage is an RVrs #1 enemy AND there's no real defense against it other than to inspect the trailer yourself on a regular basis. Unfortunately many don't. :(

As far as low voltage is concerned, if you've decided against an autoformer as a solution then your other best choice is an EMS with low voltage threshold disconnect. In that case it might be reasonably argued that a hard wire version wired in at the trailer end is a better choice than a portable version because any voltage drop will include that caused by resistance of the main service cable feeding the trailer. With a portable unit plugged in at the post it's only displaying source voltage at that location, before main service cable resistance results in further voltage drop. That's not to say one can't locate a portable at the trailer, even inside where a hard wire would normally be located, but I'd bet very few owners of portable EMS units actually do this and instead simply plug in at the post thinking that's all there is to it. ;)