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I'm hardly an electrician and my terminology is usually incorrect, but when I use the term "unbalanced legs" I mean something is off with the phase / freq / modulation. Signature Solar sells both Victron and Growatt devices to clean up the single phase 240v to provide two inverted 120v legs...

I've pretty much confirmed that the issue is related to unbalanced legs native to single phase 240v. Although the UMC doesn't use the neutral line, it wants balanced legs (as does the Chinesium charger). Both the UMC and Chinesium chargers work beautifully with my $200 5000w 120v to 240v step...

It's not the adapter. This is a brand new UMC and I also tested back and forth from off grid 14-50 outlet to on grid 14-50 outlet several times and each time it threw the error only on the off grid outlet. It also throws the error with my 6-50 adapter / off grid outlet. The 5-15 adapter is fine...

The 240v AC outputs on my inverter are L1, L2, and G. Measuring L1 to L2 is ~240v. Without bonding either L1 or L2 to G (tied to 8 foot copper ground rod), L1 to G is ~90v, and L2 to G is ~150v. Apparently this is common for single phase. Without either L1 or L2 bonded to G, the gen 2 UMC threw...

The UMC works fine when tested with 240v split phase grid power (balanced legs). I know it doesn't need neutral for 240v. With single phase 240v I was able to bypass the ground check by bonding L2 to ground, so the grounding issue is solved. However, since L1 and L2 are out of balance (~90v /...

One of these auto transformers should work to take the single phase 240v from the inverter or a generator and clean it up for proper split phase, right? https://www.victronenergy.com/autotransformers/autotransformers Do you have a link for one of the low cost devices? Since I have multiple...

The primary use of these (dirt cheap) 240v inverters is for the MPPT solar charge controller and battery charging (30kw solar and 100kwh+ LFP 48v bank). They also run multiple 240v mini-split ACs fine (heat pump / inverter), so I guess some devices are just more picky than others. This weekend...

To provide some background info, I'm charging from a single phase 240v solar inverter (fully off grid system). This is a similar power system to that used in Europe or Australia, and not split-phase like in the US. To accomodate US-based customers, the inverter provides a clean 240v / 60hz AC...

My UMC also immediately caps charging at 8a @ 240v with 5 red "T" flashes (unknown fault). I've tested both 14-50 and 6-50 adapters, so I either have a faulty unit or it can't auto detect something properly. Definitely not an overheating issue. Either way, this thing is way too over engineered...

Looks like there's no way around the 5 red flashes of death. I'm going to return the Tesla charger and buy one that actually lets me charge my car (plenty have an option to charge without ground). Thanks again for the help...

Apparently, the solution is to bond either L1 or L2 to earth to allow the UMC to pass the ground check. I will be testing this with a resistor and eventually adding a GFCI breaker to the panel. UPDATE: Bonding L2 to earth put the UMC into an all green with 5 red flashes state (adapter fault /...

I'm at a loss at this point. I tried the following with the same result each time (2 red "T" flashes = ground loss): - Changed the NEMA 6-50 outlet to a different one - Tried a NEMA 14-50 outlet / UMC connector - Wired the outlet's ground directly to the ground rod, bypassing the panel entirely...

L1 to L2 measures a clean 240v and other devices (such as mini-split AC) work fine on the outlet. There aren't any loose connections on the ground rod connection - that was the first thing I checked. You're saying a loose ground connection can cause two different voltage readings on L1 / L2 to...

Sorry, I should have been more clear. I thought that it checks L1 to ground for 120v and L2 to ground for 120v in order to pass the check. If ground and neutral are bonded at the main panel, this would be the case. I have a separate 120v off grid inverter with neutral and ground bonded and the...

I'm trying to get a mobile charger working with a 240v single phase solar inverter (off grid setup). This is a pure single phase circuit with no 120v neutral to bond to ground. As such, I'm getting a ground loss error (two red "T" flashes). My understanding is that the mobile charger needs to...