Has anyone in this forum with two or more paralleled LVX6048 units managed to charge from a genny?
Yes. My setup is two LVX6048 units in parallel, off-grid with a generator for backup (long dark winter weeks). One of the units is off most of the time right now because of the random restart issue; I turn it on only when I need the extra power (lots of motor loads usually). If I fire up the generator, the unused unit detects power and turns on to start charging (along with the always-on unit) - that gives me the ability to funnel 10kW from the generator to the batteries, which a single unit couldn't handle - this was actually a big motivation for installing two.
Critical note: I was not able to get generator input working with setting #2 (AC input voltage range) set to "UPS"; it has to be on "APL". I don't know why; voltage is certainly not dipping below 95VAC during normal operation. I have noticed that these inverters are quite sensitive to frequency - I had to tighten up the governor on my generator to get good results, as originally it would droop below 58hz under heavy load and the inverters would disconnect; it is possible that this setting also affects the tolerances for frequency as well.
Also fairly important: the relevant settings (for battery type, frequency, voltage range, etc.) MUST be the same on both inverters. The max charge current can be different. Some of those settings sync; some don't. I don't remember off-hand which ones don't, just that I've gotten bit by this before when I fat-fingered a setting change and ended up with differences between the two units.
Couple of other notes:
1. I use a dedicated breaker panel for the generator feed that will disconnect all three current-conducting legs (vs. the generator's own breaker which doesn't cut neutral). This seemed to resolve some occasional faults when starting or stopping the generator, and gives me a handy disconnect near the inverters which just seems like a good idea anyway.
2. I followed
the advice from FilterGuy here to avoid running ground from the generator back to the inverters (that is, the generator and inverters are each grounded via exactly one connection to the ground bus). As others have noted here, ground loops through the inverters appear to really mess with things.
Those changes seemed to help with the general stability of the system under load, but weren't necessary to get the generator input *working* on a parallel system. At this point I've eliminated all spurious errors, but still encounter occasional and unpredictable complete system restarts when both units are inverting in parallel; have so far been able to find any common factors between instances - sometimes happens when solar input and loads are high, sometimes in the dead of night with no solar input and barely any load on the system. Can go days without an occurrence. Have *not* touched firmware thus far, as it isn't that much of an annoyance and I don't want to make it *worse*!