I installed the PD 45 amp model this year, replaced the Univolt. I am pleased with it. It whispers only in the boost mode, but you would have to get your ear very close to hear it. I love the battery charge wizard. I got the battery tender for my scooter and riding mower (each is 6v). The only thing that bothers me is the light on the controller extension for the charge wizard. It is a bit too bright for me. I guess it's safer that way, but I turn the light side down at night.
1968 Airstream Trade Wind
2005 Chevy K1500 crew, reg. bed, 4WD, gas