Hello @BLUETTI_CARE,
I attached photos of things I observed recently. Here are the comments :
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abnormal battery depletion with system totally OFF: batteries charged 100% >> turning the system OFF >> turning back ON 2 hours later = batteries charged only 75% when back ON
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abnormal battery depletion with no AC/DC load: w/ no AC or DC consumption at all I see charge level drops by 12% in 7 hours
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strange & sudden battery charge level drops: with light AC consumption over time with normal charge level decrease, I start to see sudden drops of battery charge, from 36% down to 9%, triggering grid charge.
My AC300 system and B300 batteries are just 1 year or so old, that is less than 1000 charge/discharge cycles … if the batteries are beginning to wear out then we’re very far from the pretended lifetime of LiFePO4 batteries “10 years and several thousands cycles”…
Any explanation ?
Also, one strange thing I observed in the past months and was not the case before : I have 2 B300 batteries; and the two do not deplete in parallel as it was before ; seems that one is depleting till very low, and then the other one takes the relay.
This by the way is OK and preferred to both depleting in parallel. The only thing is that I would like to control balances, that is making sure that it’s not always the same battery that depletes and charge in priority or it’s going to wear it out much faster than the other…
Any investigation you could do remotely on my system? or any known bug requiring FW update ?
My info:
AC300 s/n AC3002309000181363
IoT=v9041.10,
ARM=v4037.07,
DSP=v4053.30,
BMS=v1021.14 = same for the 2 batteries.
–
2 Likes
Hi @LLaurent, We’ve consulted our technical team regarding this issue, and they confirmed that your firmware is already up to date — there’s no new version available for your unit.
For this issue, we recommend calibrating your two B300 batteries separately. That means connecting only one B300 to the AC300 at a time, then fully discharging and charging it before connecting both batteries together again.
When charging, please observe whether the charging process runs normally. If possible, test both AC and DC charging. Also, please check whether the ambient temperature is within a suitable range.
We hope this helps and look forward to your feedback.
hello @BLUETTI_CARE , thanks for the fast feedback & suggestion.
So, with only one battery pack, I did some charge/discharge monitoring these days.
Sorry I did not have the time to make it thorough & methodical, but what I see looks really abnormal: although it went through 2 or more charge/discharge full cycles, I continue to see battery SoC making tremendous and quick jumps to full charge or full discharge with no reason.
See screenshots below
It even looks worse than before, now focusing only on this battery…
Is there another method or tool to methodically perform the recalibration?
e.g. should I leave it discharge completely with no charging at all in parallel? and then charging completely with no load at all ?
1 Like
Hi @LLaurent, thank you for your update.
During the recalibration process, please note that you should use a load with stable power as much as possible during discharge, rather than an inductive load. And please do not connect any load during charging.
Please follow the steps below to recalibrate it:
- Please discharge all the power (charge AC & DC appliances with the power station) until the SOC is 0%, turn off the machine, and leave it for 3 hours till it cools down.
- Please charge it again. Please do not load any device when charging it, and do not interrupt it while it is charging.
You can click this link for reference.
You can compare the performance of the two B300 batteries. If only one of them drains power quickly, it will confirm that the issue lies with the battery pack, and we can arrange warranty service for you. Please click on my profile picture, contact me via private message, and provide us with your order information and email address—then we will make the arrangements for you.
