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Yes, the Tesla UMC is the only Tesla charger I have. The Juicebox worked fine when I had 240V from the grid main panel to the garage. Unfortunately, to avoid pulling another 100+ feet of wiring (x4), I used that wiring for the off-grid 240V. So I no longer have grid-tied 240V at the garage to...

Hi Summit, Without the NG bond in the critical loads panel, and with the air conditioner completely disconnected (no L1 or neutral), Vng fluctuates between 39 to 51 VAC. Are you using a transfer switch with a switched neutral? Which model? I ran more tests yesterday with the NG bond in the...

Yes, the CR panel NG bond was removed when I measured the fluctuating Vng. That's my conclusion as well. So I'm leaving the NG bond in the critical load panel. Yesterday, I disconnected the neutral on the critical loads panel output going to my air conditioner and the Tesla UMC charged up to...

If anyone's interested, I collected some current and voltage plots while charging with the Tesla EVSE at 5A, 10A, 15A, 20A and 22A. I used a custom built IoT box with a current sensor attached to one of the hot lines in the critical load panel going to the charger. Interesting to see that the...

How far is the distance from critical loads panel to the ground rod? At this point, I'd begin to determine if the inverter is bonding N-G. Most likely it is, removal of the N-G bonding in the critical loads panel, then attempting to charge off the inverter might reveal that indeed the inverter...

L1=119.7, L2=119,8 With CRpanel NG bond removed: Inverter off: Vng = 0.097V; Rng = 1.6 Mohm; measured at inverter Inverter on: Vng = 33V to 38V (fluctuating, sometimes O.L.); measured at inverter without the CRpanel bond, so there is no internal bonding screw? Tesla EV doesn't charge at all...

22A is the Tesla charger current at 240 V. I normally charge at 15A. I monitored the charger current with my Tesla app and noticed that the charge current spontaneously throttled up to 22A several times so I manually reset it to 15A. Weird. The charger faults seem to be ground related but...

I forgot to mention that I'm also powering a 120VAC 15,000 BTU air conditioner that draws 11 A. It runs fine so far, in spite of my Tesla charger travails. Since the Tesla EVSE is 240VAC, there's no neutral return current. However, my air conditioner does have a neutral return current, hence my...

Hi Zwy, Thanks for your suggestions. For reasons I don't understand, the Tesla universal mobile charger (UMC) only works when I connect the EGC to the main service panel ground and bond the N-G in the critical loads panel. I previously had a separate ground rod for the off-grid subsystem only...

Hi SunFarmer, I asked Signature Solar if there is an internal bonding screw, and they told me that some units are shipped with the screw and some are shipped without the screw. I was also told that the warranty would be voided if I opened the unit and that I would need an email or written...

Hi Zwy, Yes, I'm aware that I have 2 NG bonds, however, my EV charger will not work without the critical loads NG bond. Since I'm not using the AC input (no AC bypass), the grid isn't being used as a source, so I don't believe there's a neutral return current or objectionable current on the EGC...

Yes, I understand it was just a test, but the Tesla charger self limits the current to 8A or completely faults and stops charging if the PV+ and PV- aren't disconnected, so I will need to disconnect every time I charge the car. With PV+ and PV- connected, I got a warning on my Tesla screen every...

Hi Summit, Thanks for the feedback and reference posts. Here's my wiring diagram below. My Tesla charger started faulting again, so I tried disconnecting the PV+/- per your suggestion, and the Tesla charger faults went away (most of the time)! I cranked up the Tesla charger to 25A and it ran...

Hi Summit, Thanks for the suggestion. Haven't tried disconnecting the PV+/- yet. For some strange reason, the Tesla charger can now go up to 15A without faulting. The 6000EX isn't faulting either. No idea why both are working now with the same ground configuration as the other day when both were...

I do not have the AC input connected as my garage does not have a 240V outlet. I've tried connecting to the main house panel ground only, or the dedicated off-grid ground only, or both the main house/dedicated grounds together. Without the neutral ground bond in my critical loads panel (EV...

Sorry, fat fingered the wrong key and it posted while typing... + 5s/2p 375W REC PV panels Wiring diagram attached. The system is off grid powering my EV chargers via a critical loads panel. Neither of my chargers will work due to ground faults or the Tesla UMC throwing adapter faults (the "T"...

Hi thanhrodke: I read this thread with great interest as I received the 6000EX last week and have not been able to commission it to run my Tesla universal mobile charger nor my Juicebox EV charger. Hopefully you'll see my post, since it's been a while. I've posted my issues on another thread...

Update on my 6000EX neutral/ground and EV charging issues (see attached wiring diagram): a. Before adding the output neutral ground bond in my AC output panel, the neutral to ground voltage Vng = 49V to 51V. Both the Tesla Universal Mobile Charger and the Juicebox car chargers faulted. b...

Thanks for the responses. Filter Guy was right - after removing the PV- to ground connection, the output neutral to ground voltage went from 195 V to a fluctuating 48 V to 55 V while the PV was connected to the inverter. The fluctuations went away and stabilized at either a constant 26.2 V or...

Hi Filter Guy, Just saw this thread - sorry for joining this conversation late. I just installed an off grid (no AC input) EG4 6000EX and am struggling with the NG bond issue as well. I've attached my wiring diagram that's based on one of your diagrams. I'm measuring 195V between output neutral...

Hi Guys, Hopefully this thread is still active and my question is relevant to the neutral ground bond discussion. I assembled an off-grid Growatt 5000 ES/autotransformer system powered by a 3.7 kW PV array and 48V battery. The inverter/autotransformer outputs 240V/120V but when I bond the...

Hi All, Where is the schematic that Signature Solar says they are posting on this thread? I called Signature Solar this morning and they said it was posted on this forum. I found the 5000 ES Split Phase Grid Connection (with Bypass Switch) wiring diagram in a previous post in this thread...