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Old 04-15-2015, 02:59 PM   #11
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Originally Posted by SaskCampers View Post
If you have the PI unit, there is no need to trip the breaker as the PI delays power to the RV by up to 2 minutes depending on how you set it up.

I also have a PI hardwired unit and love it but If you want the best of the best as far as protection, get a Franks Autoformer.
+1 on the delay. As far as the Frank's Autoformer, I wouldn't say that it is better protection as the PI unit will cut power before a low voltage scenario can do any damage. The Frank's unit will boost the voltage. Difference is that you don't get the power turned off with the Frank's unit, but it doesn't offer any better protection, IMO. My understanding is that the Autoformer actually takes power from other people on the circuit; maybe you can confirm???
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Old 04-15-2015, 03:23 PM   #12
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Location: Moose Jaw, Saskatchewan
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Originally Posted by dustman_stx View Post
+1 on the delay. As far as the Frank's Autoformer, I wouldn't say that it is better protection as the PI unit will cut power before a low voltage scenario can do any damage. The Frank's unit will boost the voltage. Difference is that you don't get the power turned off with the Frank's unit, but it doesn't offer any better protection, IMO. My understanding is that the Autoformer actually takes power from other people on the circuit; maybe you can confirm???
OK maybe I worded that wrong, but I would say it is as good and offers the other set of features as well.

Yes it does rob power but it is not as doom and gloom as it sounds, you would need a number of these devices on the same power leg to make much difference.

As to the PI cutting power, I have had ours cut power several times at different CG's due to lots of units with their air on in very high temps. Yes it protected us but I had to put it in bypass as the power stayed low for a few hours. I did not turn the A/C back on as that is all that really cares about AC voltage in a trailer.

The Franks unit also has a low and high voltage shut down but the low voltage threshold is lower than the PI due to it's ability to hold the voltage to a higher level. It also has fault protection.

The one fault I have noted is that it is not designed to be installed in a hardwire mode like the PI, as I understand that has to do with UL and CSA more than anything. So it would be a PIA to me as I love to make things as simple as possible hence the hardwired PI unit in my trailer.

Herk is the most knowledgeable on the Franks unit as he has had one for a long time.
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