I live in unstable grid (AC) environment. I live in a country with 240 grid power. The power from utility will vary from 200 to 250. I noticed yesterday my AC500 was getting alarms for grid low voltage. Voltage was dropping below 200vac therefore the AC500 was kicking out the grid power. My question: would an AVR (automatic voltage regulator) plugged in grid power first, then plug in the AC500 into the AVR output, would that help or provide better protection for the Bluetti device? I want cleaner power so dirty, noisy power from the grid won’t damage or hurt the Bluetti device. Any thoughts from the community?
Hi @Tyler
@BLUETTI_CARE maybe can push a firmware update to your AC500 to support a wider Voltage range. Can you please give us your SN? Then they can check, whats possible.
greetings
Erik
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When using an AC voltage regulator only step-down operations (lowering the voltage) are possible.
Hi @Tyler, I agree with @Selfmadestrom’s opinion, there is a new firmware that could expand the input voltage range of the AC500.
Please first update the Bluetti app to the latest version, and then check if the DSP firmware has been upgraded to the latest version. After upgrading, look for the Advanced Settings and enable the Grid Self-adaption mode.
If you find this feature, please enable it to allow a wider voltage input range for the AC500.
If you cannot find this feature, please provide us with your AC500’s SN code and the current DSP version. We will then push the new firmware to your device individually.
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There are devices that can both reduce and increase grid power as needed. Here is an example of a 2,400 watt line conditioner that would be appropriate for the USA grid.
https://www.amazon.com/Tripp-Lite-LC2400-Conditioner-Outlet/dp/B0000514OG/ref=cm_cr_arp_d_product_top?ie=UTF8
So theoretically @Tyler could possible find such a device compatible with his country’s grid voltage and frequence; however, if the DSP firmware can handle the problem for him it would make more sense, and cost fewer cents. 
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Thank you. I’m still waiting on a firmware (DSP v4057.30) to be pushed to my device. Hoping that will address some issues I’m having like the inability to enable grid self-adaption. My follow-up question to that is with the UPS function being passive, the inverter passes the grid voltage downstream to all AC outputs. Meaning, if incoming grid voltage is low (<200v in a 240v environment) and if that is allowed to be passed (with grid self-adaption) to AC outputs, that could be damaging to downstream appliances and devices. Can @BLUETTI_CARE explain how the grid self-adaption works? (The explanation given in app, the system can charge normally even when the voltage on the grid is unstable due to spikes, drops, or other instabilities.) What I want to know, are these spikes, drops, or others from the grid passed through the inverter onto the AC outputs?
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Thank you. My concern is passing even a wider range of voltage through the inverter to downstream AC outputs. I live in a 240vac environment where the public grid is not stable. Just yesterday I was getting grid low voltage alarms and found the AC500 going to battery if the grid was <200v. Though at the same time, I have concerns cause the AC500 is passing low voltage (200 - 240v) to my downstream appliances and devices. If the voltage range is widen for AC input to charge, would that same widen voltage be passed downstream as well? I don’t want 190v being passed to my appliances and devices. That is far to dangerous.
Hey @Tyler
here in germany, the grid is really stable and only is like 5V lower or higher sometimes. So i dont use the self adapting mode myself.
When you set 240V as output Voltage in AC500 Inverter. I would assume that this is being delievered, no matter what input you have.
Just to being safe, can you confirm @BLUETTI_CARE ?
greetings
Erik
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Hi @Tyler, Please don’t worry, enabling the Grid Self-adaption mode will not directly transmit low voltage to your connected devices. Additionally, it is recommended to activate this mode when using a generator for charging.
Have you received the pushed DSP v4057.30 update? After upgrading, please open this mode via the app (it is disabled by default). Enabling Grid Self-adaption mode helps the system better handle frequent voltage fluctuations and waveform distortions in the input.
For example, when using a diesel generator, there may be a brief voltage drop during power switching, and enabling this mode will prevent frequent power interruptions during charging.
However, a downside of the Grid Self-adaption mode is that in UPS mode, the switching time of the machine may increase, which could cause connected devices to lose power momentarily. Therefore, we recommend disabling the Grid Self-adaption mode when using the UPS function.
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Considering it’s either fast UPS or stable voltage, why not:
- AC500 operates in Grid Self-Adaption
- Connect a smaller unit, like AC2A, to AC500, and have it ensure to fast UPS duty for critical items.
Just my 2 cents.
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Hello. Thanks for response. Due to issue with AC500, I am unable to receive push firmware (4057.30). I was told to contact service/repair on this issue. I assume the regular firmware channels should still work once made available to general public.
The operation of the working ups mode is pass through. I live in 240vac environment that is unstable. Often times I get around 200v grid power into the unit. UPS pass through meaning, that same 200v grid power is passed through to all AC outputs downstream. If you are telling me with grid self-adaption that low voltage is not transmitted to AC outputs, then how does the grid charging work? The only other option would be UPS mode would enable, hence low voltage would fall below the grid low power threshold. All AC outlets would be on battery then the grid self-adaption would be charging the battery. Would this be safe to assume?
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Thanks for pointing this out. The AC500 only working mode is UPS. Therefore, as Bluetti recommended, you can’t disable the feature when using UPS function. UPS is always on by default. Though as suggested example, you could enable the feature at times like with generator.
It would seem kinda odd to daisy chain another battery as an output to the AC500. If you were that concerned with fast UPS switching, then I would suggest looking at another solar home battery brand.
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Oh no, not concerned - I was just sharing an idea to offset the slower UPS response time in Grid Self-adaption.
Forum / App users get a few occasions to obtain AC2A for free, so daisy-chaining seems a nice option.
Regarding daisy chaining: I like to think of the Grid power recharging a Bluetti as being a form of daisy-chaining too. My home system is a Victron/Pylontech, and the excess power is dumped into Bluetti generators, creating a chain of primary/secondary generators.
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Hi @Tyler, We have reviewed your AC500’s upgrade records and confirmed that there was an issue. Your machine is unable to receive the new firmware updates via push, so we recommend contacting the seller to arrange a replacement. Once you have the replacement, please upgrade to the new firmware and enable the Grid Self-adaptation mode.
If you’re operating the AC500 in UPS mode, the low voltage is passed directly to the load through pass-through, so we don’t recommend using the device while charging when the grid voltage is not stable or too low. It’s best to fully charge it before connecting any AC loads.