Question FlexBoss Intermittent Communication Failure with Battery and Discharge

LiquidRobot · 2025-06-22T02:14:14Z

I have a FlexBoss + GridBoss + 3 x EG4 Wallmount Indoor 280AH Lithium Batteries. No solar yet so this is just providing whole house backup. In general it has worked well and I have tested the battery backup a number of times during install and it has worked through actual grid outages as well. But about once per month, I get the following sequence of events in my log: Communication Failure with Battery Battery Voltage Low (about 5 hours later) Battery Open (about 30 min later) After the first event, the SOC drops instantly to 50%. Then about a week later the SOC drops instantly to 0%. My charts never show any battery power being used. When I am next onsite (this is installed in a vacation house), I can get the system working again by turning all the batteries off and then turning them back on again. At this point, the batteries charge up from 0% to 100% like normal over the course of a couple hours, pulling 12KW during that time as expected. I updated all my firmware at the end of April but then it happened again even with the current firmware. I have done some searches and have not seen this type of failure reported. Any ideas about what is happening or how to prevent this?

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Last Post by LiquidRobot 4 months ago

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EG4 Eric

June 25, 2025 3:49 pm

(@eg4eric)

Honorable Member

Joined: 1 year ago

What do you have set for Lithium Brand?

Posts: 4

LiquidRobot

Topic starter

June 26, 2025 1:08 am

(@liquidrobot)

Active Member

Joined: 5 months ago

Battery Type: 2: Lithium

Lithium Brand: 0: EG4

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Question FlexBoss Intermittent Communication Failure with Battery and Discharge

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