Good device, but there are limitations.
I own two of these, and have two uses for them. One is at home using both to connect large 12V batteries to charge power stations during extended power outages, hurricanes, etc. Basically, just to extend the life of my 3-piece power station set, which has a main unit and two of its own directly connected batteries. It works well for this use. It is my garage with relatively stable temperature, humidity, no rain, etc. Two is in my truck using a single unit mounted in the truck bed to charge a main power station unit for various use cases mostly involving camping. It works just ok for this use.
These units are not dust or weather sealed in any way, so keep that in mind. Also, while the manual/website does claim a max working temperature of 140F, that is not true. That's how hot it gets in my truck bed with bed cover in the Summer, and I will tell you right now that is a no-go. Realistically, at max output (56V setting), your ambient needs to be 100F or less. I have found you need to drop about 8V output setting for ever 5F above 100F. So, at 110F ambient, you need to limit to 40V. At 115F, you need to limit to 32V. Alternatively, you can lower the max charge rate of the power station as temperature goes up. If you are only going to use this in the Winter, you should be fine. Be careful otherwise when mounted in the truck bed. Mounted in the cab will likely be better, because of the AC keeping the ambient temps lower.
The cables are way too short for a full size truck with crew cab and standard bed. You will only barely make it from the battery to just inside the forward side wall of the bed. You would need at least 25 feet of cable if you want to mount near the tailgate on the sidewall. Also, the provided breaker is placed on the cable to be near the unit and not near the battery. You need to fuse/breaker near the battery to do it right.
Overall, these are useful, but there are limitations that can be quite significant when mounted in a truck bed on hotter days Also, lots of trucks now come with at least a 400W inverter, so this unit is on its way to being obsolete for that use case.
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