Differences between 'TR Surge Guard' and 'Progressive Industries' :
TR doesn't trip on Low Voltage until 102V
PI trips at 104V
BOTH are too low for my tastes.......below 108V I shut down my A/C Unit
but that is me.
Biggest Difference....
TR---1 year warranty (TR.....maybe)
PI.......LIFETIME and they really do mean it/back it up
Hughes Autoformer
10% boost in low voltage.
At 116V goes into boost mode.
Below 95v Shuts Down
Above 116V goes into bypass mode
Good unit.......does what it is designed to do. Boost Voltage.
Power Pedestal>>>>>Hughes Autoformer>>>>>>PI Power Protection>>>>>RV Power Cord
About the best set up for unknown power supply (Boost & Protection)
I try to stay away from places that have low voltage issues
Power Pedestal>>>>>>PI Protection>>>>>RV Power Cord.
Low voltage ....I use my generator cause I have it.
Otherwise I might have an Autoformer except I use generator when boondocking also