I think the product is misleading, though not intentionally. The name of the product and its description give the impression that when you use it, your RV/camper will have access to 45 combined amps. "Combined" is the key word that is misleading. 50A connections...
I think the product is misleading, though not intentionally. The name of the product and its description give the impression that when you use it, your RV/camper will have access to 45 combined amps. "Combined" is the key word that is misleading. 50A connections on RVs have two "hot pins". The devices in an RV /Camper are wired to receive power from one of these two "hotpins/wires". Think of it like the two phases on your home electrical panel.
Many people are used to using 50A to 30A "dog bone" adapters. The way this works is that the campground 30A outlet has a single "hotpin", the adapter splits that single hotwire/pin into two hotpins that are present on the 50A RV connection. Think of it like a fork in the road. Therefore, the two phases in the camper each have access to the same 30A origin power source. Because of this, you can draw really any combination of current you want. You could be drawing 20A on one phase and 10 on the other. 25 and 5. 15 and 15. It doesn''t matter. So long as you are pulling less than the 30A that the shore connection provides it good.
This device is different. It pulls 15A from one power source and up to 30A from the other. The 30A plug and the 15A plug each have one hotpin, and the power that is received on that pin runs across a wire directly to one of the two hotpins on the 50A plug on this device. In other words, one hot in directly to one hot out. The two hotwires in this device do not overlap/combine in any way. What this means is that unlike the 30A setup described above where the two RV phases have access to 30A as a "pool" of power, this device will supply one phase of your RV with 15A and the other with up to 30A.
The problem with this is that it is a crap shoot what is connected to which leg of the RV. For example, you may be thinking "hey, 45A, that will run everything just fine!". But if your AC unit is on the leg/phase that is receiving power from the 15A source, you may not be able to start it. Likewise, on the 30A side you might have more intensive devices that need to be powered. Say you have an AC unit, a fridge, and a DC Converter all on the same phase in your RV, and the combined amp draw for them is 32 amps. Well, even though you have 45A available to you across the two phases, you only have 30 available on that one phase. Hence, you will may not be able to power all three, despire have spare amps on the other phase. These problems become quite relevant when you consider startup amps and the fact that they are higher than operating amps.
In other words, you have more combined amps, but you have a lower ceiling for tripping breakers in most instances. This means that you have to consider startup procedures. On a 30A system as described in the 2nd paragraph above you likely could turn on your fridge, then your lights, then your AC. And so long as you never go above the 30A you are good. On this system, especially on the 15A side, you might need to turn things on in a particular order to allow devices to reach their operating amps (lower than startup) before turning on another decive.
In case anyone is wondering, you can use a 30-15 (or 30-20) adapter on this to plug this into two separate household outlets if you want to connect your RV to your home. Doing so will exasturbate the "overhead" limit problem as described above, but you can do it without issue (I contacted Camco to verify this).