Originally Posted by kvtaylor
We still use our autoformer every time I hook up to 30 amp. It has saved my rigs several times due to low voltage and surge. For 50 amp, I have a large plugin surge protector. I never seen the need for a autoformer on the 50 amp side.
Like I said in another post, I don't have a 50 amp unit. However, it is my understanding that one Air Conditioner located on each leg of the two 110 circuits. When hooked up to the 30 amp leg only one of your AC's would be protected. Correct me if that is wrong.
Also, a "surge protector" will NOT prevent LOW voltage problems in your coach. That is the job of the auto-transformer. It's only function is to clip off SPIKES in voltage that would fry electronics.
Voltage spikes occur for many reasons.
1) Lightening strikes close by that "induce" momentary extreme voltages on the wires.
2) Heavy draw electrical equipment on the circuit (like welders or heavy tools) that pull down the voltage momentarily, then "spike up" when the heavy equipment load drops quickly.
3) You find yourself at the beginning of a long run at a campground where voltage is kept high, so those at the end of the run have "normal" voltage. This is not usually a problem until everyone's air conditioner shuts off at the same time and spikes the voltage.
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