I have asked support about this too, but wanted to see if any other community members were using their AT1/Apex300 in a similar way and had any insight on it.
I’m looking for some help with configuring Generator Auto-Start on the AT1.
The Apex300s seem to have the correct power flow for the working mode setting, but I’m seeing problems with the AT1 not sending the start or stop signal to the generator. I know the generator start/stop wiring is electrically correct because I can ‘manually’ start and stop the generator using the Generator Enable/Disable setting in the Bluetti app. Something is wrong in my generator start/stop settings or the logic of the AT1.
System Overview
My system is an AT1 with Hub A1 and 2x Apex 300+2x B500k
• AT1 Serial Number: AT12538118033148
• Apex 300 Serial Numbers: AP3002545210138313, AP3002545210405916
All components state that ‘You’re up to date’ when I check for Firmware Upgrades as of 24 March 2026.
The AT1 firmware versions are:
• IOT v30007.01.06
• ARM v9086.11
AP300 firmware versions:
• IOT v8026.13
• ARM v2204.13
• DSP v2174.16
• AC Hub v9081.09
• BMS v1073.07
Bluetti App on an Android Phone - Phone App Version v3.0.6 (up to date)
Goals
I am an off-grid user, so am using the AT1 for integrating a generator power source and the generator auto-start functionality of the AT1.
I want to configure the system so that the generator starts when the SOC drops below 30%, the ESS charges until the SOC has reached 70%, then the generator is stopped.
I have connected the Generator via a 40A breaker to the Generator connection on the AT1, and I have connected the 2-wire start signal (Common (C) and Normally Open (NO)) terminals on the AT1 control board.
Current Settings
Working Mode: Self Consumption, SOC Setting: 70%
Advanced->Generator: Enable
Generator Pro Mode: On
Generator SOC: 30% - 70%
Period: 00:01-23:59 On
Advanced->Max. Grid Input Current->Pro Mode ON: Max 40A (which I believe controls Gird and Generator Max input current)
Status
The generator can charge the ESS and charges up to 70% as per the self-consumption mode SOC%, but then the ESS stops charging and the generator keeps running and powering the loads.
In the app, I can see the power flow status after the SOC had got to 71% and the ESS had stopped charging. I was expecting the AT1 to give the generator stop signal, and to disconnect it, but it didn’t.
I can stop the generator manually by setting the Generator to “Disabled” in the Bluetti App, and then the ESS starts to supply the load.
Questions
-
Why is the generator stop signal not given by the AT1 without completely disabling the Generator in the app? Are my settings wrong?
-
How do the “Generator->Period” settings work? There are no details on this in v2.2 of the AT1 User Manual.
a. Do they define a time period that the generator…
i. should be enabled for autostart but only if needed according to the current SOC% and SOC settings, or
ii. will start and run regardless of SOC%, or
iii. something else?
b. Does the Generator SOC Setting override time period and start the generator even if outside an ‘on’ time period? -
What does the “Generator->Pro Mode ON” setting enable? I can’t find any difference with that on or off.
I’ll post updates here with anything I learn as I go along and/or what support come back to me with.
Thanks,
Julian