A homeowner who relied on an EG4 backup setup during a five-hour outage said the system worked flawlessly, but now, with it switching on during seemingly normal operations, they are questioning whether there is a deeper issue.
In a post on Reddit's r/solar, the homeowner said the long outage passed almost unnoticed, but routine brief grid flickers were followed by visible interruptions and the Flexboss dongle dropping offline for roughly half an hour.
It turns out that a feature designed to make power interruptions less noticeable could actually be creating the issues.
Here's what to know
According to the post, the setup includes an EG4 FlexBOSS 21, a GridBOSS, and one all-weather wall-mount battery. Even with that battery backup in place, the owner said short utility disturbances still came with "noticeable" flickers, despite the system reporting no errors and otherwise appearing to work normally.
A commenter pointed to a surprisingly simple yet very unintuitive troubleshooting step: turn off Seamless EPS Switching.
"In my experience that setting makes the system too sensitive to little grid variations that it should just ignore and ride through," the commenter wrote. "Because of that, it gets 'twitchy' and can cause little flickers."
Given that the system's point is to be seamless, the naming convention in that setting can cause a great deal of confusion. However, that promising comment ultimately proved not to be the fix.
Backup systems are often expensive and generally expected to smooth over short disturbances rather than respond to them. If a setting is causing nuisance switching, adjusting it could help owners get the reliability they expected.
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This is an advanced setup, and that usually comes with extra troubleshooting. Regardless, going solar is also one of the best ways to save money on home energy over time. If you're weighing a system or trying to optimize one you already have, it can help to explore EnergySage to get free solar installation estimates and compare quotes.
More background
Battery-backed systems are often sold under the idea of peace of mind during outages, storms, and grid instability. When a long outage passes without issue but smaller flickers cause strange behavior, homeowners may be left unsure whether they are seeing normal operation, a settings problem, or an early sign that something is off.
The Reddit poster said EG4 support had not yet provided an explanation and asked for wiring photos to confirm the installation was done correctly. That suggests the problem may not have a simple fix, especially when connectivity hardware, such as a dongle, is involved.
What can be done?
Documenting exactly what happens during each flicker could help narrow down the cause. Noting whether a light blinks, whether internet service drops, how long the dongle disconnect lasts, and whether any error logs appear can all be helpful. An installer or support team could also review settings such as Seamless EPS Switching, firmware status, and wiring.
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The homeowner wrote, "We are deep into hurricane season now and I am getting paranoid about whether the system will function properly in a grid down situation."
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