I’m contemplating getting two 120V 48/5000/70 Quattros and running a critical load panel for UPS and peak use load shifting ---- 2 of the items to go on this new panel are 240V AC power.
The Lynx Bus would connect 48V battery banks (SOK or EN4 rack mounts) and output from an MPPT RS 450 | 100 and feed both of the Quattros, and the Quattro’s combined output would do half of the 180 phases to make 240V returning to my new panel. (each Quattros primary 120V AC will be a 50A breaker in my main house panel, I’ll be sure to have these two single pole breakers on different legs in my main panel).
I’m considering the Quattros vs. the MultiPlus II units since the former can have 2 AC inputs, namely:
input 1: grid power from my main panel, and
input 2: a generator input
Talking with CurrentConnected when asked about how to get my generator output into my 2 Quattros:
ME: if i have a pair of 48/10000/120 quattros in split phase making 240V output… how do i hook up my single (240v) generator output - when I have 2 inverters each doing half the waveform?
CC answer: Each Quattro handles one leg of the split-phase waveform (L1 and L2). Your generator should output 120/240V split-phase, with:
** L1 → Quattro #1 AC input*
** L2 → Quattro #2 AC input*
** Neutral → shared neutral bus*
** Ground → bonded appropriately*
The Quattros will sync to the generator waveform and pass it through or charge batteries as needed. You’ll want to ensure the generator is split-phase compatible and that the Quattros are configured for split-phase input.
About the bolded part: “ensure the genny is split-phase compatible” what do I need to look for in generator specs other than 240V output, in the 10k watt range they come equipped with the typical L14-30R - so is creating a spliced pigtail so i can send L1 “to the left” and L2 “to the right” on my wall to each Quattro and sharing the N and G as appropriate?
Do you have/ have you helped with a split phase Quattro setup in the US with generator input? How did you do it?
This is not up to code, you should have a single 50A two-pole breaker, both legs (L1 and L2) need to break at the same time if there is an overcurrent event.
The advice from Current Connected is 100% correct.
If your generator has both standard 120V outlets and an L14-30R and is labeled 240V, then it is very likely split phase. Split phase is sometimes called 120/240V. A 240V-only generator would not have any standard 120V outlets on it.
Yes, L1 goes to the first quattro, L2 goes to the second quattro, and the neutral must go to both (this is critical), so you will need a Polaris connector or really big wire nut to split the neutral to both quattros. Ground everything as usual.
Yes, I have put my ancient 7500W 120/240V Generac generator into my two quattros successfully. I used AC-In-2 because I normally run off of grid on AC-In-1.
You need to configure those quattros for split phase when they are commissioned, be sure to read the manuals.
the generator i have in mind definitely has several 120V output plugs and the single 240V
Polaris Connector - yes, makes sense
Do you have your Cerbo auto-engage the generator based on SOC of your bank? (its my understanding that when the generator into AC2 gets engaged the Quattro disconnects AC1 and the main panel feeds…) this is my plan to have the generator kick on when my batteries get to xx%
I’d have CurrentConnected configure the settings as part of their kit. I see the main difference between the two Quattros will be the neutral-to-ground setting being different on one vs the other.
I do not, as I rarely need the generator.
But lots of other folks do that sort of thing successfully.
I’m not so sure about the AC-In2 kicking in like that, if anything, AC-In-1 has priority I think.
I’ll have to go read the documentation on that, or maybe someone else here could better clarify.
Current Connected will take good care of you, but you need to tell them what your use cases are ahead of time (like split-phase configuration) and your generator plans.
The Neutral-Ground bonding is frequently a cause of problems in configuration.
Be sure that there is only one Neutral-Ground bond present in your system at any given time.
10-4 I meant in a grid-down situation (where AC1 input is nil). having my genny provide AC power into input2 as my batter bank SOC gets to a predetermined level.