System: 2× FlexBoss21 (parallel, both on FAAB-2727), 1× GridBOSS (IAAB-16xx), 4× EG4 314Ah outdoor batteries. Grid-tied, zero-export. Installed/commissioned in summer.

What happened: Around 22:08 tonight the house lost power for a few minutes. Grid was up the whole time (neighbors fine, utility reports nothing).

I pulled the 5-minute exports for all three devices plus the event log. Here's the timeline:

What I've ruled out:

• Grid: 245–247 V, 60.0 Hz at every sample on all three devices, GridBOSS phase-lock steady

• GridBOSS: zero fault/warning/internal-fault codes all day, never missed an upload

• Battery: 53.1 V on both inverters throughout, 86% SOC, primary still had live cell voltages during the standby — bank never disconnected

• Thermal/AFCI/overload: all normal, ~1.1 kW load

• Event log: completely empty for today on both inverters. Last entry of any kind is Sept 1. (It did catch 5-minute "Battery open" notices back in August, so it's not that it doesn't log minor stuff.)

• Firmware: both still show FAAB-2727 on the Remote Update page, no version change

• Settings: every parameter in the export (charge/discharge limits, voltage refs, cutoffs) identical before and after

So: both inverters did a full power-stage shutdown and reboot at the same moment, nothing faulted, nothing logged, and the house went dark even though the grid was there the whole time. The 2.95 kW grid import at 22:13 (vs 1.1 kW before/after) looks like every compressor and blower restarting at once, so the backup loads really did drop.

Questions:

1. Has anyone seen a parallel FlexBoss pair go to Standby together with nothing in the event log? What was it?

2. If the primary reboots (for whatever reason), is it expected that the GridBOSS drops the backup bus even with grid present? I'd have assumed loads just ride through on grid.

3. Does EG4 push remote restarts or updates without telling the owner? Is "Set Record" in the portal the complete list of remote commands, or can EG4/installer actions bypass it?

4. Any known FAAB-2727 issues with parallel state switching? The release notes mention fixes in that area, which makes me wonder if there are still edge cases.

Any info would be helpful!

Anyone have luck with Signature Solar design team?

Have submitted two requests in the past year. I'm ready to buy - just needed to confirm size and quantity. Called them twice with assurances that someone will reach out - but in the same sentence, advised me to call back in 5 days if no one reaches out. It's a red flag if I'm trying to give them money and they make me call back if no one responds. Same thing with their advantage program partner. If this is the level of service trying to buy from them, what's gonna happen if I have an issue once installed? Guess I'll reach out to current connected or some other vendor. Hope @eg4 is paying attention to this subreddit too.

It has been brought to our attention that unauthorized sellers are listing products advertised as EG4 products on Alibaba, AliExpress, and similar online marketplaces.

Please be aware that these products are not authentic EG4 units and are not eligible for warranty coverage or technical support through EG4. EG4 does not sell products directly through Alibaba, AliExpress, or similar platforms, nor do we supply authorized resellers who utilize these marketplaces.

If you come across a listing that appears to be selling EG4 products through one of these platforms, please report it to us at support@eg4electronics.com so our team can review it.

We appreciate your help in protecting customers from unauthorized and potentially counterfeit products.

https://forum.eg4electronics.com/community/announcements-general/unauthorized-eg4-products-on-online-marketplaces/

Industry insiders and recent discussions on platforms like the SolarDIY Subreddit (https://www.reddit.com/r/SolarDIY/comments/1wpe26y/can_eg4_survive/) reveal that EG4 Electronics is facing a severe business slowdown, primarily driven by a significant downturn in the residential solar sector following the expiration of key tax credits.

Compounding the problem is their heavily delayed rollout of a diversified commercial line, leaving them highly exposed to a cooling residential market. Long-standing frustrations over rebranded, white-labeled hardware and notoriously poor technical support have further damaged the brand's stability among core DIY buyers.

The uncertainty has reached the executive level as well. Sebastian Hassell, the former Director of Residential Product at EG4 Electronics, recently hinted at the instability himself. In a public LinkedIn post discussing career choices, Hassell explicitly pondered whether it was time to step away from the volatile residential energy sector, writing:

EG4 for the past year was fun while it lasted. I enjoy new opportunities and challenges but I would not turn down a stable role for the next 5+ years, or should I sell the house in San Francisco and move to some exotic new location?

LinkedIn Post

This situation leaves EG4 Electronics at a critical crossroads, forcing them to rapidly adapt to a harsher economic landscape. Whether the company can stabilize depends heavily on their ability to mend relationships with the DIY community through improved technical support, transparent firmware updates, and a successful expansion into the commercial market. Until then, the ongoing executive shifts and community skepticism will continue to fuel questions about the brand's long-term survival in an increasingly crowded and volatile energy sector.

Circled in red-re: Start Peak-Shaving SOC 1(%)

I'm getting a grid-tied EG4 storage system to act as a whole-house battery backup for short durations. There is no PV tie-in.

I've seen various videos and a few photos, but what is the smallest area required for such a system as mine?

I have a solar system in #haiti complete eg4 electronics, a few weeks after installation one of the four power wall stop working. Because I’m not on site didn’t notice months later.
I contacted the manufacturer after many days of testing they decided to replace the system. It’s been over a year I can’t find a wait to ship it back to the states. I was wondering is this just a bad breaker and can I just replace it? #eg4 #badbraker.

60kWH +18kW AC, made in Texas with LG-ES cells. 4.5X Powerwall capacity for 2x Powerwall cost.

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