So i bought the Dometic PLB40 a few weeks ago. Absolutely loving the battery pack. Let me give a real life review.
I installed the ARB fridge freezer wiring kit into my Tacoma with the outlet installed behind the back seat. I have the ARB 50 fridge. On my road trips i never park for multiple days without moving the vehicle. The truck might be parked overnight, let’s say from mid afternoon until the following morning. Maybe 18 hours without moving.
After installing the PLB40 i used the truck around town as i normally would. I kept the PLB40 plugged into the ARB power outlet during the day, and disconnected it in the evening. I live in Southern California, so the truck gets hot during the day.
The PLB40 performed amazingly. During the day it would always be fully charged, driving around going to the store etc. kept it fully charged. In the morning it would usually be at 75-80%, and as soon i i would plug it back into the ARB power it would start charging very fast. A little driving around town and it would be back at 100%.
A few times I disconnected the PLB40 at 5pm, and didn’t drive the car again until the follow afternoon at 5pm (24 hours). The PLB40 was at about 50% charge after 24 hours. Great performance if you ask me, considering the truck sat outdoors in the heat all day and the fridge obviously had to work much harder during the day. I feel confident that the PLB40 would keep the fridge working for 40 hours before needing the be charged. Probably a little longer.
I love how small and portable the PLB40 is. My wife can easily pick it up and put it into her truck. The electronics are very easy and all built into the unit. It charges very fast. When i first received the unit i did have to do the firmware update so that it wouldn’t shut off after 1 hour of inactivity. A quick call to Domestic and they mailed me a cable and instructions on the firmware update. I am a computer idiot, and i was able to do it. I bought the unit for just about $700 shipped to my house. Considering the cost of building the same charging system, the light weight of the PLB40, the 40 plus hours of power for a fridge, and the convenience of the battery, i think this is the way to go.