Hello!
I have a strange problem with my AC200Max.
I am using it as a power supply for the fridge in my camper.
It is being charged from car battery power.
I havent used the Pack for around 3 month, but topped it off to 100% before not using it and switched it on every month to allow it to charge if necessary.
I came back today to both a low and a high voltage battery warning.
The pack is sitting at 100% Soc according to the display.
After turning it on it shuts down after around 5 seconds.
It does no charge in that timespan and will shut down immediatly if any load is drawn.
The cell voltage does not make sense to me, is shows 3.31V on all cells exept 2 - one is at 1V and the other is at 4.99V (is this even possible on Lifepo?).
This looks like a BMS defect to me?
Any idea if (and how) this pack is savable or does it need a service?
As it’s been unused for 3 months I would try a bms recalibration by charging to full with nothing connected then fully discharge until the unit turns off then charge back to 100% and see if that makes a difference.
How would you do that on a device that turns off after 5 seconds? Is there a way to “disengage” an auto shutoff?
Sorry I don’t know how I missed that in your post. Sorry.
As you can’t get it to stay on for any more than 5 seconds it looks like your only option is sending it for repair. Il tag @BLUETTI_CARE in the post and hopefully they will pick it up soon.
You played with my hopes right there! I already thought there is a hack to turn off the auto shutdown and fix it via BMS recalibration :). Thank you for the tagging
We are in experimental territory, not sure if it will work but I will try:
-turn on your AC200max and try to activate DC on right away (without a load): even without a load, normally this prevents the AC200max from turning off when it is not in use…
-if you have a small solar panel, connect it to your AC200MAX normally, it wakes it up and it cannot be turned off, normally.
But not sure if the safety mode of the AC200MAX doesn’t override all the above mechanisms to stop it anyway.
Thanks for the input.
I already tried turning on the device and than dc/ ac directly and drawing a load. On DC it shuts off after the 5-10 seconds, on ac it shuts of immediatly if any load is drawn.
Unfortunaly i dont have a pv panel, i tried 12v battery charge and charge via charger, but as its sitting at 100% it does not accept any charge.
Unfortunaly i dont have a pv panel, i tried 12v battery charge and charge via charger, but as its sitting at 100% it does not accept any charge.
->But if you managed to prevent the AC200MAX from turning off automatically by connecting a battery to the solar input… can you turn the AC on your AC200MAX and try to discharge it in order to recalibrate it as suggested by KTT ?
Hi @VolkerF, Since this AC200MAX has not been used for 3 months, we are concerned that it may have become over-discharged.
Please refer to the suggestions from @Ktt and @Snips1 and try testing the following charging methods:
- Car charging
- Solar charging
- AC + DC charging at the same time
If it still does not work, then we will need to arrange warranty service for you.
Hello, when stating “no used” i meant not drawing any power in the 3 months. As stated in my initial post i turned the pack on every month so it can charge. So between turning it on the last time and now there should only be around 4-6 weeks. Today i tried the 3 methods (ac charge, dc charge, ac+dc charge). Unfortunatly it still does not accept any charge and will turn off after 5-10seconds. The case i opened is Nr. 420763.
Hi @VolkerF, thank you for letting us know.
We found that you previously sent an email to our official website support mailbox. However, upon checking, your order was placed on eBay.
We have forwarded your email to the eBay team and urged them to reply to you on a priority basis.
Hello - having the same problem here. I have my AC200Max in my campervan but mine was plugged into the grey colored DC adapter box which is connected to my house battery, so AC200Max was receiving continuous charge - in other words, it shouldn’t be discharged. I’m showing 100% SOC but am getting errors 042 and 043 and I can’t clear the errors. Unit beeps for about 15 seconds and then shuts off. My understanding was the BMS had low temperature protection - it did get to below freezing for a couple of days. Is there a fix for this problem that doesn’t involve having to send the whole unit back?