Recalibrate the battery meter in Bluetti solar generators

This video documents the procedure to recover a Bluetti Solar generator in the case where the battery meter has become inaccurate. Symptoms of this are generally: charging taking too long, charging not taking long enough, or battery percentage dropping dramatically during discharging.
This procedure works on all current production (Dec-2022) Bluetti units, including the modular solar generators.
Very specifically, it works on Bluetti's AC50, EB3A, EB55, EB70, EB70S, AC200P, AC200Max, AC300, AC500, EP500, and EP500Pro. It also works on the B230, B300, and B300S batteries.
It is likely this same procedure will continue to work on future models as well, but I do not have direct confirmation of that from Bluetti.

[@DenaliDad]

I have owned two of these Bluetti devices. Without going into irrelevant, lengthy details, the first one failed completely and they replaced it with the one I have now. It has done better--meaning it has not failed so far--but this rapid-discharge problem has been happening for months. It is also different from the conditions in the video, so I saved this video thinking I might need it one day, and here is that day. My AC200Max works fine. I use it to charge electronic devices and batteries and to power an iPad clock overnight whilst I sleep. Except on rare occasions, it is not used during the day. (I am currently staying with a daughter.) The issue has been the discharge. It slowly makes its way down the scale as the nights go by, but then one day, without any advance indication, it will fall from, say 70 per cent (noted after turning the DC Off) to zero that night. Yesterday, I performed the reset process. I started with an almost fully charged unit and used a portable fan my daughter had stashed away for the winter. It draws enough power to push the process along, but not enough to cause any overheating problem. The discharge took the entire day, so when the device turned itself completely off--no green Start light showing--I plugged it back into a wall outlet. Several (sleepy) hours later, the battery was at 100% and the brick LED light was green. Hopefully, that will fix this problem; I am still not a fan of Bluetti and would not replace it, but it is what I have now, and I want it to work properly. UPDATE (Later the same day): I allowed the unit to turn off by itself with no cables attached; it showed 100% and I did not use it all day. When I turned it on later to charge my devices, the battery level showed 63%...without it even having been on or in use. Bluetti does not make a reliable device.

[@Bellasafari]

You may have had the inverter on for 110v? It uses way too much w to run the inverter imo. I use the ac300

[@carlos439]

I have the same problem, mine it’s an AC200 from nexgen company, basically the same device with another name, and same problems 😅

[@jacobhn2]

Hi, it's a bit of a shame that there are so many different faults with the power bank, they're actually good when they're running, I have ac200p and I've obviously been lucky, I just have a fault with my watt meter, it measures too much (300 watts) when I only have 30 watts on the ac out I have a watt meter on which also shows 30 watts but at 1500w it shows correctly I have found that if you press soc in the middle of the screen that you can see the power consumption on the battery and volts as well and so calculate the wattage my user uses on dc out no load (52v*0.1A=5.2w) and AC out (52v*0.3A=15.6w) sometimes more/less it's probably BMS running in the background, if you go into settings and BMS maintenance and press 5-10 times in the upper left corner, volt information appears on each cell and they should preferably be the same 2.5v-3.5v normal 3v-3.45v (3v=10%. 3.26=50% . 3.45=100%) during charging you will be able to see that the cell reaches 3.65v and shortly after charging will finish then the BMS will handle the rest of the cells so they are equal in voltage there are 16 cells (40Ah) in series 55v*40A=2200wh.

[@James-ke5sx]

Great information. I have an AC 200 Max and two expansion batteries. I just got this so it's brand new. But I'm starting a file of different things that could go wrong with it and your video is going to be the number one on the list in case it happens to me. The first thing I did when I got it I upgraded the firmware which at first didn't work. It actually bricks the system at first. I had to try 15 times to install the new firmware and finally it worked. That was brand new out the package I almost cried because I thought my $4,500 had gone down the drain instantly.

[@Go4Corvette]

I ran my AC200P to zero by accident and it killed the display so Bluetti sent me another unit under warranty. I was told that the new unit has been reprogrammed so that if you run it to zero this will not happen again. I love my Bluetti and have used it a lot for my RV. It makes camping a lot easier. Thanks for the video.

[@Aranimda]

Excellent video. I got the AC300 and the manual recommends to fully discharge and recharge the battery every 6 months. And this actually applies to all lithium based battery meters. For example, if you have a laptop, and always use it on AC power, you may end up with the Windows battery indicator telling you: Battery 90%, plugged in, not charging. Actually, the battery is full, butt he meter is off. Solution is the same. Unplug the charger. Use the notebook off the battery until the battery is empty and the laptop shuts down. Then plug in the charger and charge it to 100%.

[@francosermenghi3903]

Thank you from ITALY, you have saved my home plant.🎉

[@dirtdog2089]

Thanks for the video was just about to return my Bluetti and seen your video. I have only had it for 2 months and use it everyday it has about 50-60 cycles on the life of the battery so far. The last week or so after running a very light load of 20 watts the battery meter dropped from 100% down to 20% in only 4 hours. I was like what the heck is going on. I bought a killawatt meter to check the capacity and sure enough it was the battery meter out of calibration. After about 80-100 watt usage the meter dropped 80%. The last 20% of the meter ran 550 watts lol. I have the eb70 that has 716w/h capacity. I confirmed with killawatt meter that the battery was fine I got about 630 watt hours out of the battery which is about 90% efficiency rate. Thanks for the video after doing the re calibration it works perfect again.

[@goldbugnwgpa774]

Found your post and followed the instructions. Worked like a charm. Instead of an expensive internal problem, a simple recovery and mind easing results. Thank you for posting your findings. Have a great evening.

[@loutrioti8375]

Your instruction sets are very helpful and appreciated. As another viewer already mentioned, Bluetti recommends cycling the battery every 6 months (AC300 manual) presumably for those who have a non-permanent install of this equipment for emergency use only. Although they don't specifically say to run it down until the unit turns off, that seems like the best option and, thanks to your video, a very good reason to have a T-500 adaptor on hand.

[@ericb.4358]

BTW, THANKS for this important info. BLUETTI should have included in the owner's manual (which I have written into it).

[@Christian-pr2gv]

Thank you for your great explanation! I just got a new EB3A. It was delivered with 67%, I charged it and while I waited I applied a firmware update. At this point it was at 99% - and after the firmware update it fell down to 67% again. I wondered and was worried about eventually "overcharging" the battery. But your video has calmed me down again. I will now try to drain the battery completely and recharge it to get the charge indicator right again.

[@lindazimmerman1109]

Jeff, thank you for all your videos, it is VERY EVIDENT you know what you are talking about. I NEED HELP BADLY and Bluetti services are not responding. This is apparently their response to all customers, based on comments I have read from customers who have purchased their units. I purchased a Bluetti AC500 and (2) B300S. A family member hooked up cords from battery to battery then to AC500. Everything was working, batteries charged slowly (solar panels); and when fully charged I did a test of the generators/batteries. Using a small radiant oil heater, and heavy duty cord, I ran the heater, The heater had settings so started on lowest (did fine) then went to medium setting (did fine), then went to highest setting (did fine). Watts on the heater ranged 600-1500 based on setting. Based on this video, that was #! mistake, that I have learned from you. The batteries were used up, alarm on AC500 was sounding, and after several times, punched on screen .buttons trying to stop noise. Saw the AC button and thought I am not using AC so turned that off. Finally I was able to turn off screen/unit and now it will not turn back on. I have plugged it into a wall unit using the cord provided by Bluetti, and plugged it into the AC500. And after a while, it still will not turn on. I assume that because I turned off AC button it is not accepting a charge. So I am at a COMPLETE loss as to what to do, to get this thing started!!! I am NOT a "techy" person. Barely can turn on computer and cell phone! Any help you can send to me will be greatly appreciated!!! Bluetti is not helping people, will not recommend their products to anyone because of lack of customer support. Thanks!!!

[@JWH-01]

Turning off the AC on the screen only turns off the output, not the input. That won't affect the charging. I am guessing that you completely discharged the batteries to the point the head unit can't turn on, as Jeff described. Try charging one of the batteries slightly from another source to get enough power to turn on the head unit.

[@nwlady1844]

Once again... great video. Happy to hear this is not a every 4 mon. maintenance.

[@pavel9652]

Great video! My AC200MAX dropped from 95% to 0% in no time under small load of phone and power bank charging. I think this is after days of charging it with unreliable solar (winter time now in Europe) and discharging with AC load (dehumidifier) as well as other light usage. I own the unit for about half a year, and have two B300 extensions in the mix. The BMS must have got confused and lost track of the correct state of charge. I need to recalibrate the whole stack, but will wait for the second T500, since I have no grid and will run it on inverter generator. I think the manual recommends to discharge the unit completely every 3 or 6 months.

[@MrMaxxsilver]

Jeff. Very grateful to you for this video. I may have this issue as a couple of times 70% went to 0% overnight, with the entire unit switched off. If it happens again, I'll be following your instructions to the letter!

[@BarryKolsky]

Thanks Jeff. Always appreciate learning new things about the bluetti generator.

[@Tomb920]

Very informative video! My AC200Max is only a month old and the battery meter seem normal. Good to know this meter recalibration procedure incase I will encounter it in the new future. Thanks a lot Jeff! and more power to your Channel.

[@mcconja]

I finally picked up a 200 max. On the initial charge it went from 65% to 100w in minutes. Ran it dead and back up. It worked.

[@StAnger561to770]

When you say you ran it Dead were you able to get the LCD to go out? because for me once it goes to 0 it just quits giving out power but the LCD still works

[@mcconja]

@@StAnger561to770 correct. Ran it to zero.

[@borandell9915]

Wow! Thank you for this video. I have the same issue with an EB3A. I'll give it a shot. I was about to send this unit back. Thanks again.

[@mike.briney]

This is great JEFFROO!! Thanks for throwing this together!!

[@in_sympathy]

I was quite skeptical about this but it surely works. Thanks for a great advice 👌🏻

[@stiggywatts4258]

A very useful piece of information. Thank you 😊

[@michaeleconomides4054]

Thanks. I saw the "meter going up too fast while charging" problem just the other day. I was wondering what was going on. Good to know it can be fixed!

[@billleblanc819]

Very informative, thanks! BTW, this video earned you a new subscriber.

[@betsypower7850]

Thank you so much for this video. I am having trouble with mY AC200P I’m going to try these things🤞 I am in the Tucson area and would not even know where to take my solar generator for prepare. Thank you for all your hard work and willingness.😊

[@MoroccanDutchieTravel]

And did it work out?

[@dhmon58]

Thanks for the accurate information.

[@Lord72969]

So full of useful info. Thankyou so much.

[@volodymyrkuspis6278]

Thank you a lot for this video! It was very helpfull!

[@josephmiller6866]

Thanks for showing how to do this

[@OverlandOne]

I use my ac200p in my campervan and, since I am always charging (solar) and dicharging ( fridge, ac unit) at the same time, bluetti reccomends running it down to 0 and fully charging once per month. I have been doing that for the 6 months I have been on the road and it seems to fix any discrepancies on my meter...like dropping from 100% to 70 % in 5 minutes with not much load. Thanks for your video.

[@badbobber]

Great info!

[@Speed00007]

Thank you for this sir!

[@logothaironsides2942]

Thats very interesting. I dont have a bluetti but I do have a hyundai which is 1040 wh and often mucks up the battery display as you have described here. I will try discharging and recharging as you demonstrate. I have discharged and recharged before but didnt realise it had to be constant and complete for both those operations. Its quite possible I have never actually got it reset due to not running it down in one go and then filling it up in one go.

[@GreKno63]

Awesome - Thank you !!

[@Zubrania1]

@WaveformScience - great video. Appreciate your efforts. Is there any negative effect for the AC200MAX if it will be discharged to 0% and charged back to 100% let say on the cycle basis? Or there are any discharge boundaries which it is better not to cross on a daily basis

[@worldcomicsreview354]

I had my one go from (an indicated) 61% to 0% while turned off overnight. A very cold night, mind you, I thought that was the reason. Just today I went from 59% to 69% on my new jerry-rigged solar setup, which I thought was pretty good, but one run of the little countertop dishwasher later and it was at 23%!, I know what my weekend project is.

[@user-jv5nw3zp3q]

Hey there, Jeff! Thank you for doing this video. . .quick question. When you say it needs to be completely out of juice and power itself off, do you mean that the display will turn off or that you can no longer to the display on at all? Thanks so much!

[@Misadventures-OldLady-ey7zx]

Question: How do you know when the unit has shut itself off? Thank you so very much for the video. You give a clear description of the problem and then how to resolve it. Well, I have this problem. I tried it but unfortunately, it didn't work. I will try the discharge/charge process again. Not sure where I went wrong, except I didn't do a "steady" discharge. Will do so on my next effort. I had used Christmas lights because that is what I have available. When the lights went out, the battery displayed "0" readings.

[@Johnny_Kanuk]

Well this kinda worked for my AC200P. It at least lasts longer than it did. I'm on my 5th attempt. Last time I just kept turning it back on after it would turn off until it wouldn't turn on anymore. Now charging it from that state to see if that does anything. Gave up on customer service. Haven't heard anything from them since January and that was just to tell me they were going away for holiday. Happy I paid $2k for a paperweight.

[@zanedzikonski4234]

Thanks for the video. Mine seems to be fine except at either end. Seems to charge to 69% then goes to 100% in a few minutes. Then if I have a decent load ( 600 watts or so) once it gets to 15% it goes to zero in a few minutes. (Normally I don’t go below 32%) I use daily and only charge on solar so it makes sense it’s drifted a bit over time I’m hoping this helps and it’s not a better issue. Thanks again.

[@ilovelalakers]

Good to know discharge and recharge needs to be at constant rate. Took AC2000MAX to zero and recharged with solar a couple times without problem being solved. I'll try this.

[@pavel9652]

I think solar could work, just do it over a good, sunny day to ensure as stable charge as possible. Perhaps it isn't ideal, because the input will fluctuate, but should be sufficient if done frequently.

[@longtonailtrdwtr8715]

Only seen it once…..I’ve seen it referenced almost daily on the Facebook page. However, those are typically with expansion packs. Nonetheless, this shouldn’t be common, yet we’ve accepted it as the norm. I am the proud owner of BLUETTI products so do not mistake this as me hating on this company.

[@pavel9652]

He didn't say it. He said he saw himself only once when he needed to cycle the battery twice in a row to calibrate, it was that bad. I have AC200MAX with two B300 battery extensions and no grid access, but supplement it with Hyundai 2kW inverter power generator running on petrol. It seems recalibration will be a frequent weekend project! I have mixed feelings about it, but it isn't too complicated.

[@wallywo7392]

This was brilliant thank you very much indeed I have just received an Ac60 and the power meter was decreasing massively and charging very quickly. I've recalibrated, the question I have is does mean this unit is faulty and should I return it, is it likely to keep on happening again, is it faulty as such? Thanks so much for your help.

[@bjkcoronel]

Thank you for this video. I’m using EB70S and having a problem with the battery meter. How do you fully discharge the battery? The unit seems to stop at a certain amount (hard to determine cause the battery meter shows only 0)

[@yontorres]

Very useful! Were is the forum mentioned on this video?

[@st8kout961]

I assumed it's the Bluetti forum.

[@davidkaplan4777]

Jeff I have ep70s and I have been using the recalibration procedure since December. Even with the recalibration my unit seems to become inoperable (dead) at around 60% on the primative meter. When I attempt to recharge the meter registers at 60%. I don't know if the meter is bad or the battery itself. Your thoughts?

[@Vegetarian57]

Great video but doesn’t help with mine. Did it a number of times. Display also shows “short” now when charging from grid. Bluetti ghosting me. I can draw about 200 watt hours before it goes to zero

[@MoroccanDutchieTravel]

I tried it twice to resetting the bluetti doesnt work. I did exactly as you showed how. It didnt do anything

[@StAnger561to770]

Hey thanks a lot for the video I'm not sure if it's because I have a European unit but it's brand new and I noticed that once it gets 0 it quits giving out power to any device. Therefore I don't see how I could drain it until the LCD totally shuts down. I've only done a few Cycles on it what I've noticed is once it gets down to about 20% it suddenly shuts down. I'm using a industrial extension cord connected from the battery to the dehumidifier so I'm not sure if that has anything to do with this overall I am happy with the purchase as long as it keeps working what I'm thinking to do is just to shut it off or rather unplug the dehumidifier as it reaches 20% because I don't want to damage the compressor with the sudden power loss and then maybe I can use the wireless charger for a few more percent anyway I'm not a electrical engineer but I read on some lithium-ion battery website that it's actually better for the batteries long-term not to completely drain them to zero. In fact I've started this procedure on my tablets and cell phones what I do is when it reaches 45% I charge them back up to about 85% instead of going from 0 or very low percentage to 100% thanks for listing that curve chart though I think that helps me explain why I suddenly lost power after 20% thanks again

[@martinkratky-cellist]

Thanks for the video, Jeff! As an AC300 owner (with two B300 units) that is off-grid, I have an issue with the two batteries becoming unequal, and diverging in charge. This could possibly be a calibration issue with one or both. I tried to perform your procedure a while back, before watching this video, but didn't completely deplete the batteries so the head unit shut off (just until it showed 0%. In hindsight, I'm glad I didn't as I don't have a T500 adaptor!). I have tried routing the cables in different ways, tried switching their relationship with the head unit at night when the unit is off, to no avail. Being off-grid it is an inconvenience to equalize them separately with a generator only to watch them drift apart over the course of a week or two. Do you have any suggestions about keeping the battery modules equalized?

[@st8kout961]

You don't need the T500 should the battery refuse to connect to the AC300. Any way to get it to 1% will do it, such as connecting it to another 12v battery or cigarette lighter (with the motor running), and he didn't say it but a solar panel might do it, plugged directly into the B300 with the provided cable (check the panel and battery spec first; do go over the Voc rating. For my B300s it's 60 Voc.

[@leianth1]

Hi Jeff, When we do this battery drain from 100% to Zero. Do we need constant power output or it's ok just to have it drain even using anything tat consumes power? meaning power consumes constantly? or anything that makes the power drain as long as it's using power. can you help to enlighten me a little bit? Sorry I'm a bit blurr about tis process of battery drain.

[@danielphillips2759]

Wish it was that easy Bluetti is horrible,I tried the same thing 5 times never got past 10% re-charge until it stopped charging. Bluetti said ship it to them at my cost of $360 shipping and maintenance repair cost of $375 I’ve seen multiple people have the same problem so I went with EcoFlow zero issues and VTOMAN same zero problems I don’t recommend anyone spend $1600 for a paper weight.

[@gordhopkins]

Thank you for your videos. Unfortunately, I must be missing something. I've tried recalibrating my AC200Max and B230 several times using the method you mentioned for the AC200Max by itself. In my case, the AC200Max and B230 are connected throughout the process. I run them both to 0 and shut themselves down, then recharge using the T500. I've tried recharging with the AC charger connected to the AC200Max sometimes and other times via the B230 but neither approach has worked for me. The batteries start off at 100 but then start diverging so they get up to 30-35% difference in SOCs (e.g. B1=65% and B2=32%. Then they start converging again as they approach zero. At several different charge levels, I've looked at the voltages on the individual cells and they are almost always identical - only differing by 0.01 volts usually (e.g. 3.22 v versus 3.23 v on B1 versus B2). It's very annoying. In your experience, what do you think is happening here? Do I need to do the calibration on each battery separately and disconnected? The B230 has its own BMS but I'm not sure how the two BMS's work together. I was assuming the BMS on the AC200Max was the master one trying to balance out the charge on both batteries. I have BMS v1017.04 on the main unit and v 1011.09 on the B230. Any help would be appreciated. Thanks again for your videos.

[@piernaline6027]

Hi from Italy. I am testing my ac500 since I am having a large battery drop at night. Pv priority and grid connected but with device in standby (ac/DC off, wifi off) the loss is 10% in just one night. Any way to limit such drop, by correct setting of grid/panels? Or other reason? As UPS and if not at home, I cannot consider to unplug grid or panels.... Thanks for tips

[@MoroccanDutchieTravel]

My AC200P go from 100% to 25% is second. It’s crazyyy

[@st8kout961]

I've done the recalibration a few times, most recently after adding two more batteries which caused it to go out of whack again. One battery goes into STANDBY at 90% after the other 4 batteries are at 100%. To push it to 100% I have to add Grid Power to solar charging and then it will instantly jump to 100%. Sadly the calibration didn't change that. If I buy one of those chargers do you think recharging that battery separately will fix it?

[@tommacdougall]

Thank you for the video. After updating the firmware my Eb3A was acting strange.The power station's battery when from 99% to 35% in 60 seconds and the update of firmware stated it was successful. Although I thought this rather strange, I then proceeded to charge the battery and for 5 minutes or so it would go from 0 to 65 watts of AC input mostly 0 watts, then all of a sudden when it got to 40% it jumped to 100% and the fan came on roaring for 3 or 4 minutes. None of this sounds normal to me, have I got a faulty power station or the battery needs to be recalibrated? I discharged to 0% with a fan at 71 watts and then for 20 minutes kept turning it on then charged it to 100%. Does this sound right?

[@kyletmanfre]

My device would not turn on from my solar van. I plugged it into my house outlet but it says it's pull in from the house is at zero percent.

[@richardhobbs7107]

AC200P - Reliably will go to 0 and shut down at 48.- Volts. Recharges from 120 v. charger in minutes to 56.7 volts indicating 100%. Rinse / repeat. Running microwave at 1200 watt discharge lasts only a minute or so & off. Running the refrigerator at 110 watts lasts longer . . . but still off at 48 volts within 20 minutes . . . . ! ! Guessing the battery may have a weak cell or two ? ? Any ideas ? thanks, rh

[@Treetopflyer777]

Just got an AC180. Plugged a small LED light into it (18w). Killed the full battery (1152Wh) in about 18 hours! Plugged in in to charge and it was charged in like 40 mins to 100%. Is this the same issue you’re discussing? The battery life is half what I’d expect it to be. And charging time is like 1/4x what I’d expect Thx!! EDIT so after turning it on to use it following the very rapid charge, the battery shows 0% So it drained rapidly to zero. Took 40 minutes to charge to 100%. Then when I turned it on was showing 0% again.

[@Ajacka916]

Is the issue of the modular units still relevant? Or has firmware fixed it?

[@3574ist]

you said plug the t500 or t400 into the battery to charge it. where do you plug it into please? I don't see a place

[@Jakepp235]

How can I maintain the battery over time ? Any tips if I don’t use it for a long time maybe months please?

[@kennethhamburg8909]

Just a quick question why don't they have it so that the firmware will not allow it to discharge itself to empty keep in at least 10 per cent of the battery, so by doing that they will be solving a problem .

[@a1d3nh0]

My battery goes slow to 51% (4-5 days) then turns off very quickly after that. Should I do this?

[@denisallard8137]

Hello Jeff and thank you for this insightful video. As I write, I am attempting to discharge an AC200Max + two B230s using an 800 watt Handy heater connected to AC. I have two questions for you regarding this calibration procedure: 1. For the sake of graceful calibration, should I make sure to drain all three units independently even if the AC200Max might shut off first? In doing so, I'd just use a compact 100-watt inverter connected to the barrel connector of each B230 for example. 2. Once all three devices have died, can I reconnect the T500 to the AC200Max and expect all three to eventually wake up and assume charge will evenly spread across all three or should I treat the AC200Max like a head unit and perform three separate charges? Thank you, Denis

[@MontegutMQ]

I’m doing the same with one B300. I’d love to see a reply from Jeff.

[@pavel9652]

I think you can discharge the whole stack at once, as the station should discharge the extensions first, but I would charge independently all units, disconnected from each other. Otherwise the power will be leaking into other units. I think discharge process isn't as important. You need to hit known point, that is low voltage cut off, and then charge to the max level, so the software can count the charge. Charging with solar might be good enough if the day is sunny and there are no clouds, but won't be as clean as T500.

[@jko7337]

Can I do the same with a B230 ? The chargelevel jumps from 70 to 100%

[@zfontain1975]

What's your bms version on your ac200max? Mine 1010.02

[@StAnger561to770]

just got a unit last week my bms is 1017.03

[@mrp55net]

The recommended operating temperature range for the AC200 MAX i is 14F to 149F. The Lithium Iron Phosphate battery chemistry prevents charging at and below 32F. This makes it possible to operate the AC200 MAX below the minimum charging temperature. Is there any way to display the cell temperature of the battery unit during operation? For cold-weather outdoor enthusiasts or for users who forgot to pull the Bluetti from "cold storage", the cell temperature display would be helpful.

[@WaveformScience]

I agree, it would be nice to have a display of the core battery temperature. Bluetti has not exposed this information in the UI. You could contact them and ask if it can be exposed. The system has to know this information, so in theory it could be made available.

[@wowreallyyes1]

Its hidden in the BMs information on the data page you have to tap the left top corner of the screen 5 times

[@dominicespengler]

Again, excellent work and thanks so mcuh for going into this! I have had this problem more than once, but it had fixed itself in between. Now I know what to do. Is it possilbe that this will happen every time now because solar charging is so unreliable? Also, an unrelated question to which you of all people might know the answer: I take it that AC200Max is not supposed to be charged below 0 degrees celsius / 32 Fahrenheit (?). If solar is connected to it, it won't turn off and will automatically draw from the panels. If the temperature in my van goes below the critical 0 /32, will it then avoid charging automatically? Or do I have to make sure to unplug the solar if there is a risk it will get to be below 0 /32 in my van?

[@mrp55net]

I have not experienced the problem first-hand, but I've seen a YT video where the content provider's AC200 MAX reported error code 041, which is a BMS temperature issue. I can't remember if the unit refused to operate or if it stopped charging. In any case, the AC200 MAX was not permanently damaged, it just needed a warm-up :) The video was shot at a remote location at the provider's cabin during winter.

[@mrp55net]

Here is the video that I was recalling : kzbin.info/www/bejne/api1o3eQgcRjqM0

[@dominicespengler]

@@mrp55net Thanks a lot for the tip! :)

[@papa54321]

Thx Jeff.. I just got a new AC180, my second one.. Was at 80% Tried to charge it and it got berzerk... Charging at only 285 watts so i updated the software and the BMS. Reset the Bluettu. Same thing. Look at what charging mode i was, standard... Tried different ones nothing changed.. then it finally moved to 1.2kw in turbo... and it went back to 285 watts. I put it in stamdard nothing changed so i let it go and when it reached about 97% it went back to 1.2 for a few seconds and went down to 285 watts again. Never been able to reach 100%, still charging stucked at 99% it still going berzerk at the first charge jumping from 285 watts to 1.2kw to 552 watts wtf... I saw your video and now emptying it and will charge it again..

[@dangeroustoman]

Mine 200p when plugged into the wall will start pulling the full power for a few minutes and then drop to 11w. The power meter (p200) when started read 54% and after 2 to three hrs it's dropped to 52%. I don't know how it can discharge when it's supposed to be charging.

[@WaveformScience]

That’s more likely to be a bad charging brick as opposed to a battery meter calibration. Take some video of what is happening and send it to Bluetti’s customer support by email.

[@Scoopz1234]

I have a question im hoping someone can answer. If i turn the ac200max off for the night and go to sleep, when the sun comes back out and my solar panels start generating power will the ac200max start to charge or does it need to be turned back on manually to start accepting charge?

[@kayaking_camping]

It should turn on automatically by the solar system when sun hit the panels, i have the ac200p it does turn on automatically everyday i hope this helps

[@pavel9652]

True, it turns on when there is energy input, but it won't turn on the battery extensions. Perhaps they would turn on if they have own input, didn't test it.

[@Jane-zr1xr]

🙏

[@edonline6783]

I discharged mine to 0%, but the unit didn't shut it self down. The LCD display stayed on showing 0%. Should I wait for the unit to shut it's self down on its own before recharge?

[@MrKasper25]

Same with mine my display say 0% but it hasn't turn off. What did you end up doing?

[@StAnger561to770]

Yeah I noticed that on mine as I was watching the video because I was using a dehumidifier about 350 400 w but it shut down however the battery was still on showing 0% so I'm not sure how I'm going to drain it till it completely shuts off if whatever I plug into it is not getting any power my devices are new and they're the European model so I don't know maybe they updated the firmware so you can't deplete it that much so the machine totally shuts down maybe something with the BMS I'm not an electrical engineer but I thought you don't want it completely depleted that much anyway.

[@pavel9652]

Don't drain it completely! When is hits the low voltage level at 0% it cuts off the AC/DC loads. Less than that might hurt batteries and you might have difficult time starting the unit and having it accept the charge at all. I think it will switch off eventually when you leave it on at 0%, but it is another safety measure.

[@jeffreykropp7664]

My AC200P charges gradually from 0% to 80%, then in just 2-3 minutes it jumps to 100%. This happens whether charging from the brick or solar.

[@pavel9652]

So you know what is your weekend project ;)

[@lacy8658]

Looks like there is another issue with the AC200Max we can add to the long list.

[@HenryPlus9]

This is an issue related to Lithium Phosphate battery chemistry, as stated in the video, and common to all such devices, not just with the AC200Max.

[@ericb.4358]

I have an AC200 MAX and is VERY slow to charge form my Off Grid TREK 220 watt solar blanket. The owner of Off Grid TREK for the SAME results whereas his similar EcoFlow unit charges FAR faster. Q: I there a BLUETTI software fit for this problem?? (Or am I just stuck with a slow charging unit?) UPDATE: I failed to read the BLUETTI manual thoroughly. Once I did I selected the "PV" (PhotoVotaic) charging mode and the unit charged nicely from my 120 watt Off Grid TREK solar blanket. On a hunting trip in Nevada it worked great, running a small cooler all day and charging up BOTH my e-mountain bike's batteries. Although an expensive system (Off Grid TREK 220 watt solar blanket -> $1,700. plus BLUETTI AC200 MAX -> $1,200.) it is totally reliable and requires no loud, stinky gas powered generator or lots of cans of flammable, stinky gasoline. Also it's a great home emergency power supply in extended power outages.

[@LaraSatoriHarris]

Witty! :D

[@RomanRoman-xi3dv]

Hello, you say use constant load to discharge. Can i just turn on AC aND DC and use that with no attached device ti duscharge battery? This is slow but nithing is more constant compared to this internal loss of conversiin. Right?

[@WaveformScience]

That can work to discharge, yes. It will take quite a while though: ~4days with an AC200Max. Make sure eco mode is off before you try this method otherwise it will turn off the AC output automatically after 4 hours.

[@RomanRoman-xi3dv]

@@WaveformScience thanx. Last time device showed 30% and then 0%. I charget it to 100% and disharging now. I wonder on what SOC will turn of after dis calibration

[@RomanRoman-xi3dv]

@@WaveformScience hello. I did calibration. This time divice shut of on 20%. Should i calibrate onec more to get 19, 18,17 and lower state of charges? This is new device out of the box i did use it for only 2-3 cycles.

[@st8kout961]

That would be agonizingly slow. I use 2 window air conditioners set to 60 degrees so the compressor doesn't shut off, (turn off "Energy Saver"). That should drain it fairly quick if it pulls a few kilowatts. Or really anything that can run nonstop for a few hours. Maybe a treadmill.

[@RomanRoman-xi3dv]

@@st8kout961 but the main pont of recalibrating is to do it slow. There are bo fast recalibrating. Slower you go, the better will calibration geylt.

[@papa54321]

I dont know if you realize the problem with this BMS.. explanation.. As it wont know if batteries are getting old. He just record when its empty and when its full. We will think that our batteries will be still good but they could not be and would drained faster as the age of the Bluetti goes. so it's impossible to know if our batteries were brand new or not at the purchase

[@ernieschatz3783]

At 0% state of charge, my AC200P shows the cell voltages at 3.2v. That's far from a cell- damaging level.

[@ditzen7191]

Is it the same with the B230?

[@jko7337]

I have the same question, can I use the same procedure with B230 connected ?

[@kingerz]

Run it down to zero. Plug it into the mains. Charge it up to full in one go. Saved you 15 minutes.

[@deeprootslandscaping4499]

Ok so, I have an issue with this. My unit takes 3 hrs from around 30% to 70% and then within minutes it's at 100% It discharges awfully fast aswell. Now we have a bit of an issue with this resetting procedure. We depend on this unit to run our fridge and freezer and we are completely off grid. That means I have to run a gas generator for way to long. Any ideas what I should do?

[@WaveformScience]

It sounds like resetting the battery meter would make it more accurate in your case. It is an issue that the calibration procedure takes the unit out of service during the process, but there is also maintenance needed on other generator technologies that requires shutting down the unit. I don't know of any generator based on any type of technology that is designed for 100% long term duty cycle with only a single generation unit. Even commercial power plants shut down every now and again for maintenance.

[@deeprootslandscaping4499]

@@WaveformScience They advertise as an off grid solution. If I had known I'd have to take the unit to town to plug it into ac power I would have done something different

[@WaveformScience]

@@deeprootslandscaping4499 I think a rental generator for a day would probably be a better option in your situation. Just make sure to get an inverter type. Hondas tend to work. Again, all power generators require occasional maintenance. You can reduce the maintenance interval by charging it all the way up to 100% once a month or so. If you truly need 100% “no down time” power then I would suggest a second unit as a backup standby. Critical infrastructure like hospitals use this method. They go so far as to make sure the backup unit is made by a different company than the primary so that the failure modes are different between the two units.

[@deeprootslandscaping4499]

@@WaveformScience I have s generator buy it takes 6 to 7 hours at 467 watts to charge the unit from 30%

[@Ajacka916]

I have 2 ac500s an 12 batteries this would be a nightmare

[@zooooooooooooooooooooooooo9533]

Bluetti should have calibrated the battery meter even before they shipped them out.

[@WaveformScience]

They do calibrate them at the factory. As I say in the video, most Bluetti devices will never need this procedure. You only need it if the calibration becomes off for some reason.

[@RS-il5zw]

Too much waffle in this video - on my second Bluetti with the problems identified in this video, first one worse than the second. Main comment on this recalibration is that it happens too frequently, which implies that the monitoring of the state of charge is not good enough i.e there is a design flaw in the monitoring system. The product is meant to be used where there is no access to mains to recharge at a steady state - if this happens when you are using it remotely, then you have an expensive very heavy brick. Have watched many videos on testing of self build systems, and none of these builds exhibit the issue raised by Bluetti users.

[@laryangel4082]

Ii

[@user-du8yk4gl5e]

Hello . I ask you for help. We have no war in Ukraine light. My family needs such a device. My family does not have the money to buy such a device. The cold has come to Ukraine. In our house, heating depends on the light. We freeze. I ask you if there is an opportunity to help my family to acquire such a device. Please help me. Excuse me for the brazen request. Please help.

[@chee75]

what about input only 23 watt .i unplug the unit shot off no power at all .i been charge 3 day show 100%full charge .when i unplug it die what should i do