Review on Tripp Lite PR40 DC Power Supply - 40 Amps, 120V AC Input to 13.8V DC Output - TAA & GSA Compliant by Chris Litton

Hmm, as soon as I turned the unit on it said it was rattling. When I pressed lightly on the top of the case, the knocking stopped. Bad selection. It can be seen that the gap at the contact point between the upper part of the housing and the front panel is of different widths. Now I have inserted a thin piece of plastic neatly between the front panel and the case cover. How long it stops rattling - who knows. A bad landing is a big disappointment. After working with the stock for a few days I will update this review if there are any issues or if the rattle comes back. Given the cost of this device, I expected more. I used to buy much cheaper power supplies and they had better build quality. Update 9/4: Used the PSU extensively, works well. If it weren't for the rattling of the housing cover, I would have given it 5 stars in the rating. I have increased my original 2 star rating to 3 stars.