I know it's an old thread but it is still relevant to me. We still have intermittent occurrences of the Xantrex XM1000 inverter going into overload when disconnecting from shore power.
So is this a bad inverter or is there a design issue? I hate getting into the habit of replacing things in the hopes of fixing something only to find out later it was something else. Given that I am not an electrician but I am a firm believer in the adage that numbers don't lie, I decided to "run the numbers" as a way to try and figure this all out, so here goes. Please feel free to correct or otherwise point out anything I may be missing.
According to the specs of the refrigerator we have (Frigidaire FGHC2331PFCA), they state that the refrigerator can draw 8.5 amps@120v. I will assume that is a maximum amp draw, say during a defrost cycle and the compressor running at the same time and not a continuous draw but it could account for the intermittent pattern of overloads I am seeing where the refrigerator is at or near max amp draw when disconnecting from shore power or during a shore power failure.
Then going to an online conversion calculator, it says that at 120v, a 1000w inverter is only capable of producing 8.333 amps continuously. If that is truly the case, then with the max amperage draw stated in the refrigerator specs, the inverter is borderline going into it's overload capacity whenever the refrigerator is at max amp draw.
So is my intermittent overload occurring because the refrigerator just happens to be in a defrost cycle and/or at max amperage draw as well as max capacity of the inverter when I disconnect shore power and other times not? I can't say for sure, but taking what I am seeing in real time usage and now reading the actual specs of the components involved, it's easy to make that conclusion.
So I am pushing hard to get Jayco to first, upgrade the inverter to say a 1800w version to either make sure that the inverter can handle any and all max draws from the circuit without going into overload but also to cover the possibility of the inverter actually being bad.
But given that Jayco decided to power an entire circuit via the inverter that in our case, not only has the residential refrigerator on it, but the TV, a sound bar, a satellite receiver, a Keurig coffee pot, the antenna amplifier, etc. how can they truly expect this wouldn't be an issue should we lose shore power during a storm or other situation?
So I am also going to push to have things rewired so that the refrigerator is the ONLY thing powered by the inverter, which in my opinion, is the way it should have been in the first place. I say that based on the fact that if we opted for the 2 way RV fridge instead, the inverter would not be included and would be a complete and total non issue. The way it's wired now, in my opinion, was just the quick, cheap and easy way for Jayco to add the residential refrigerator/inverter setup to an already existing circuit with no real though of every day use or the ramifications of "designing" (term used VERY loosely) things this way.
2018 GMC Sierra Denali 4WD LB SRW 6.6L Duramax
2017 Jayco Eagle 330RSTS