I have a ac200p unit supplied by 600 watts of pv at off grid weekend cabin. When I leave for the week, I
turn the unit and the solar off, Usually the unit is fully charged when I leave. When I return and turn the unit on with the solar off the display will read a low charge around 15%. Then I will turn the solar panels on and the display will jump to 100% within minutes. Not sure sure which one is correct.
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Hello,
Could you please provide the SN code for your AC200L and the BMS version number? We will push the BMS firmware to see if it improves the situation.
Additionally, please perform a charge and discharge cycle by completely draining the battery and then charging it back to full without any load during the charging process.
@BLUETTI As I have an AC200P, but not with any current issues, how is a firmware push installed to a power station that has no external connectivity via Bluetooth or WiFi?
You note AC200L, the original poster has an AC200P. 
Hello,
Thank you for your understanding. The firmware upgrade indeed requires a Bluetooth connection. I apologize for the earlier mistake. He mentioned the AC200P, while I referred to the AC200L, and I have made the correction.
If you have any other questions or need further assistance, please feel free to let me know!
@ekim I would suggest you need to recalibrate the AC200P’s display.
First, make sure the AC200P is fully charged, without any output loads.
Then apply a constant load, such as a heater at preferably 25-50% of battery capacity (500-1,000W). Disconnect solar and the charging brick during depletion.
Then recharge from the grid or a gas generator until full, without any loads during recharge (Turn AC & DC outputs off, no solar input).
You may need to do this twice, if the issue persists.
As an aside, if you put a plug in power meter when you discharge the 200P (Into the output socket the heater is plugged into), this will tell you what the actual battery capacity is. The 2,000Wh will reduce due to efficiency loss, self consumption and a small reserve before shutdown occurs. Anything over 1,650W, shows it to be good.
I tried the discharge/charge sequence 3 times without any success. I was using the brick charger and a portable heater drawing around 960 watts. The discharge cycle took around 15 minutes usually jumping to 0% around 75 to 85%. The charge cycle took around 45 minutes jumping to 100% around 30 to 40% on the display. The screen shows no faults and everything else looks normal. I didn’t get a
total watt/hour reading since it never ran that long.
Thank You, I will try this and let you know how it turns out. Mike
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15 minutes is a quick discharge. Try a lower load i.e. no more than 500W, then do a Power brick 500W charge to see if it is any different.
At 500W out then in, both discharge and recharge should take approx 4 hours. (A little less on discharge and more on recharge.)
If either occurs very quickly, my 1st thought is the battery is not holding charge.
I tried the charge/discharge sequence again with the brick charger for the charge and a 250 watt load for the discharge. Charge time was about the same 40-45 minutes. Discharge time was longer at about 45 minutes which would make sense with the lower load. I think I am giving up. BLUETTI says it might be repairable, but don’t think that is an option with shipping costs. Thank you for your help. Mike