AC300 battery maintenance

Product Discussion BLUETTI Apex & AC Series
1

The AC300 manual says to discharge the batteries at least once every 6 months. Does that mean a full discharge to 0% or is there some other percentage I should shoot for? I am using the system as a UPS (my devices are plugged directly into the inverter, no transfer switch) with the default setting of Standard UPS/Offline UPS.

Thanks,
->g.

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2

Hi @glc650 , Yes. Completely discharged means that the machine is drained of power until it is turned off.

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3

Does that happen right at 0% or does it reserve some juice and shut off a little before?

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4

Hi @glc650 , You can discharge the machine to 0, then fully charge it.

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5

Just did Mine! Some times you forget.

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6

You discharge it until it shuts off. If the battery meter is calibrated correctly this will be at 0%. But if the battery meter is miscalibrated it may happen at a different percentage. It is important to discharge until shutdown. This will help to keep the battery meter calibrated correctly.


After the battery is empty, recharge it. Do not leave it sitting empty. Reaching empty does not hurt the battery, leaving it empty will hurt it. If you have no access to reliable power to recharge it, then it is better to wait with the draining and recharging cycle until you do.


Recharge to 100%. And with 100% I mean, until the charging stops. In cases it is possible that the charging continues after 100%, this means that the 100% point is not yet calibrated. Just let it charge until it is done. Then the unit knows where their 0% and 100% points are. Now you have reached fully empty and fully recharged. This has recalibrated the battery meter. Your system is now ready again for use.

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7

Yes I know the dance. My 3rd time doing it.
Thanks
I have three sets to do.

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8

So I have two Apex 300 with four BK3000 each. They are hooked up to an A1 board.
So it takes some time to zero them out… And longer to charge them, I also have two Ac 300 with 4 BK300 each so I split up the discharge and recharge. I have found it is easier to discharge through the A1 board but much faster to unplug the AC300 from the A1 and charge them separately. My max input from a Honda 2000 is 568 watts per unit through the Ac 1 but 1645 watts if I do each one separately. I don’t know why the AC1 limits the recharge input but if there is a fix I would love to hear about it.