Since this has happened our batteries are not communicating with each other, and we are told that the inverter may need to be replaced.  

I have been in contact with Lelia Cavillo, but last communication was about 3 weeks ago.  I have since sent 2 other emails with no response.  Our last email was she was getting with upper management and going to contact SignaTech.  I have not heard from anyone.  I have also cc’d James Showalter and he has not acknowledged my emails either.

I would greatly appreciate getting this resolved.  Also we are being billed from SignaTech for something that we should not be responsible for.  

taking the wires loose, the voltage is 400v, after plugging in the voltage drops to below 100v

even the breaker below the unit voltage drops when pugged into the inverter

the other side works fine please help

I hope someone from the EG4 technical team or an experienced installer can help me with a question about the EG4 12000XP.

I have carefully read the EG4 12000XP User Manual, especially section 8.4 (Neutral-Ground Bonding). I understand that the AC input and AC output share a common neutral, the neutral is never disconnected internally, and the inverter can create the Neutral-to-PE bond using the N-PE Connect setting if required.

However, my installation is very unusual, and I have not been able to find any information about this situation.

The system will be installed in a rural area of Cuba. The utility company does not provide a neutral conductor or an equipment grounding conductor. Only two energized conductors come from the utility line.

For many years, the house has been powered through an old tap-changing transformer/autotransformer located before the main electrical panel. The purpose of this transformer is not isolation but voltage regulation because the local utility voltage is very unstable.

One incoming utility conductor passes directly through the transformer, while the other is connected to one of several taps to decrease the output voltage. After leaving this transformer, the house receives approximately 127–130 VAC to power all the household loads. There has never been a dedicated neutral conductor or an earth grounding conductor in the installation.

I am planning to install an EG4 12000XP with batteries and solar panels, and I would like to eliminate the old transformer if possible and connect the utility directly to the inverter.

My questions are:

1. Can the GRID input of the EG4 12000XP operate with only L1 and L2 connected, without a utility neutral conductor?

2. If there is no utility neutral available, should the GRID Neutral terminal remain unconnected?

3. If this configuration is not supported, what is the manufacturer's recommended solution?

4. Would an isolation transformer or another type of transformer be required?

5. If the N-PE Connect function is enabled, can the inverter create the proper system neutral for the AC output even though the utility supply does not include a neutral conductor?

6. Is there an official wiring diagram or application note for this type of utility supply?

I would really appreciate any guidance from the EG4 engineering team or anyone who has experience with this type of installation.

Thank you very much for your time.

• EG4 diagrams for the ESS show a conduit box directly on top of batteries and directly below the inverter. this space, according to the documentation should be 19.75" but the conduit box is < 10 inches - so this can not be accomplished
• EG4 diagrams illustrate and document " In the following diagrams, units are spaced 6.69 in. (170 mm) apart " ( eg4 document link ) and clearly illustrates the inverter atop the conduit box, atop the battery - also making the horizontal spacing of the inverter < 19.75"

In my (completely off-grid) installation I will have 4-6 EG4 280 ah wallmount batteries and 2 12000XP inverters a generator distribution panel and a loadcenter/main panel (combining inverter outputs). Further more, if I were to meet this separation requirement in a room or a dedicated "shed", floor to ceiling needs to be ~ 9'2".

Has anyone had any practical experience in deploying such a configuration (permitted) or has any stated deviance/variance from EG4?  To pass inspection the ESS must observe all clearances by the vendor, so any deviance/variance would need to be documented by EG4.

note: I contacted EG4 "support" who redirected me to "technical support" but would not forward my email to them, or provide me with an email to contact them.  I'll have to explain this over the phone to "technical support" but this post will be useful to direct them to - and hopefully answer this for someone else.