Hi all. So, I've continued to diagnose. (I'm doing this myself because there aren't any RV techs anywhere near me, and none of the electricians I've tried to hire have any idea about RVs.)
shore power-->50 amp distribution panel-->30 amp breaker-->magnum-->RV outlets?
Yup. Here's
a diagram of my breaker box, for reference. (I didn't realize how this was wired when I posted initially. I've been doing lots of learning on this.)
Shore power at home, or in a campground?
Campground.
The next inline diagnostic is not difficult to do work wise but may be a hassle logistics wise.
An alternate source of power.
Here's what I've done: I removed the wire to the Magnum from breaker #3, and ran a 12ga wire from breaker #3 to #12 (and connected the separate neutral bars). So I'm powering the right-side bus of the breaker box from breaker #3, and I've eliminated the Magnum from all house outlets. That seems to have solved the problem. No more power issues at this point. (But also not a long-term solution.)
Assuming it is as you said Power TO the Magnum. not from it. The suspect list:
…
After that the inverter itself becomes suspect.
I did see surges on breaker #1 (one leg of the 50amp inbound power), but I'm not sure if that was a cause, or an effect of the Magnum crapping out (and dropping the load, which I think would show as a voltage surge?). That said, I think it
is the Magnum,
because… breaker #7 has never had an issue (even when I moved things from #9 to #7).
Electronics on #9 (power passing through the magnum): Fluctuations.
Electronics on #7: No fluctuations.
If it was an issue with surges coming in from #1, I'd expect to see #7 having issues too. But I never have. And, as mentioned above, all the outlets are fine now that I've bypassed the Magnum.
Also interesting: This only happens in late afternoons and nights. That roughly corresponds with the temperature dropping below freezing. I don't know how that'd cause the Magnum to malfunction, or if it's related or just a coincidence. (Maybe the late afternoons and evenings have higher load in the RV park because everybody's using their heaters, and
that's causing issues.)
Anybody ever have issues with an inverter/charger having issues with freezing temps?
