I have a full off grid set up:
HUBA1 - (2) APEX300+B300K combo - (2) SOLARX 4K
powered by
(8) 580w bifacial solar panels
(1) Cummins generator Onan P4500iDF
It works well but I run into a couple issues:
1 - I need to completely disable BYPASS mode
I want all AC loads to be powered through the inverters at all times, never directly from generator input.
Yesterday, my generator ran out of fuel and because the system was in bypass, all power instantly shut off. That hard shutdown damaged my PS5 and projector. I need to prevent this from ever happening again.
I switched to Custom Mode and set SOC Low = 0% / SOC High = 85% , but none of the modes I see seem to actually remove bypass behavior. How do I force the system so it ALWAYS runs loads from the inverter and only uses generator/solar to charge the batteries?
My goal is:
Solar = priority 1
Generator (when running) = priority 2
Inverter ALWAYS powers loads (no bypass EVER)
Generator should only charge batteries, not feed loads directly
If generator stops, loads stay ON from battery without interruption
2. I want to maximize generator charging speed through the Hub A1
Before using the Hub A1, I was charging both Apex 300 units separately from my generator’s two 120V 15A outlets.
That gave me around ~1500W + ~1500W = ~3000W charging total, but I had to disconnect the Hub A1 every time to do that, which cut AC to my cabin every day for a moment—not ideal for the appliances…
So I switched to using the TT-30 120V/30A RV plug → Hub A1 AC input. That way I can keep the Hub A1 connected, but now I only get around ~500W per Apex (1000W total). This is way below what my generator can deliver.
How can I increase AC input charging power using the TT-30 to the Hub A1?
Is there a way to:
Unlock full ~3000W charging through the Hub A1?
Use both Apex chargers properly at 120V?
Or should I feed the Hub A1 with 240V split phase to activate both charging channels?
Regarding the issue where AC output turns off immediately after AC input is lost, please provide the SN, firmware version, and historical error codes .
Regarding the requirement for the system to always power the loads from the inverter, the generator should be used only for charging the batteries and not for directly powering the loads.
Regarding the problem of each Apex300 charging at only about 500W (approximately 1000W total): Have you tried adjusting the input current setting separately on the Hub A1 ? Please inform us of the current amperage setting .
Thanks for your support. Hub A1 : HA12524000254269 - Communication Board SN: IoT2513022269651 - Firmware v8026.10
1&2. The generator is plugged with the tt30 to the Hub A1, so I have no control on what power the load, but I assumed there was a kind of Bypass mode that got the generator to power the loads directly because every time I shut down the generator, the electricity cut off for 1-2s, which is not good for my appliances.
3. I did, I raised it to 18A then 20A, but I have been told I should not raise it too much since there is only one Hot on my plug (L1,neutral,Gnd - no L2). Now I get about 1800W. Can I raise it to 30amp safely ?
@jlaine what Bluetti is suggesting to do is disable Grid Self-Adaption in Advanced Settings. The reason is that if Self-Adaption is enabled, the UPS function in the Apex will not work fast enough and your connected devices will lose power in an outage. Grid Self-Adaption is not enabled by default, but you might have turned it on because you are powering the Apex from a generator. The Cummins model you listed is an inverter generator so hopefully you don’t need Grid Self-Adaption to charge the Apex.
However, if Grid Self-Adaption is disabled and your connected devices are losing power when the generator turns off, that is indicative of a fault with the Apex because the UPS should recover power within 20 ms.
A workaround could be to charge the Apex through the solar inputs instead of AC by using DC power supplies powered by the generator. That will prevent the Apex from entering bypass mode. Unfortunately there is no direct setting to disable bypass mode on the Apex 300, or any other Bluetti power station that I know of.
My solarX4k tripped with an “overvoltage” error twice in the past 2days.
Whenever it happened, the full apex300 associated tripped as well and wasnt able to function before a full reset.
Why is that ? How can I fix it ?
(set up is (4) solar panels 580W connected in series to one SolarX4k connected to a Apex300+B300K bundle with the P090A cable)
Hello,
Please follow the steps below to check and operate your setup:
Make sure the VOC specification of your solar panels is within the supported range of 12V–60V.
Open the APP → tap the DC input icon to check whether the PV input voltage is normal.
The Apex 300 has two independent DC input ports. If the total VOC of your solar panels exceeds 60V, you can connect part of the panels to the other DC input port for charging.
If both DC input ports on the Apex 300 are already connected to solar panels, we recommend purchasing a SolarX 4K step-down converter.
If your Apex 300 is connected to a B300 or B300S battery pack, you can connect one solar panel directly to the battery pack’s PV input port:
B300: 12V–72V, 200W Max
B300S: 12V–60V, 500W Max
Note: Connecting solar panels directly to the battery pack’s PV input can also charge the entire system, but the Apex 300 will not display the charging power from the panels connected directly to the battery pack.
Could you please provide the open-circuit voltage of your solar panels? Has the temperature dropped recently? In such cases, the voltage of the solar panels may be higher, which could cause errors. However, theoretically, the open-circuit voltage of four 580W solar panels should not exceed 500V.
Additionally, please provide the actual error code and check the actual PV input voltage in the APP.
If you have any other questions, please feel free to reach out!
It hasn’t happen again so I don’t know the error cod I will come back to you if it does.
About the power cut to the bluetti load when the generator stops:
I turned off the Grid Self-Adaption in Advanced Settings
But it still cuts the load for a secondd every single time
Note: Connecting solar panels directly to the battery pack’s PV input can also charge the entire system, but the Apex 300 will not display the charging power from the panels connected directly to the battery pack.