EB3A Impact on battery lifecycles or inverter having UPS always on?

Product Discussion BLUETTI EB Series
1

I have a couple of my EB3A devices in UPS mode all the time. Was wondering what the long term impact might be on the longevity of any of the components in the EB3A? Typically have12w-75w devices attached. Is there a best practice I need to consider to maintain longevity of my EB3As? Thanks.

@BLUETTI

2

Is your unit not getting hot and pulling charging every 30 minutes?

If its getting warm and regularly topping of the batters this can’t be good.

Best practice is to store it at around 60% charge and make a full slow charge cycle around once everyone month

3

Hi @roxie60

the problem with you UPS Mode is that you load isnt a passthrough. The Battery gets charged and you consumed from the battery. As soon its drops to 99% its charging again.

So you kinda kill your battery cycles, when you use it permanently like that. As far as i understand

greetings

Erik

4

No in UPS mode AC load is getting passthrough. Also all the voltage and frequency fluctuations from the grid getting directly passthrough.

5

Yes, but the Unit still draw power from the battery which need to recharge that 1% everytime its drop

6

I tried it once on my ref (inverter) for curiosity sake. My eb3a gets warm so I decided to unplug it and do not tried it even use it as UPS on my PC or wifi.

7

I think what we see is that the AC is passing through to the AC loads but none of that AC is powering the unit. The unit still is drawing a small amount of power from the battery all the time just because it is on. So when it gets down to 99% the unit goes into a normal charging mode using AC which converts some of the AC to DC to recharge the battery back to 100%. It just keeps going back and forth with these mini charge discharge cycles. I can’t think of anything that could be done to prevent these mini cycles without causing other problems in power usage.

1 Like
8

It could not try to keep it a 100% charge but for UPS mode charge it initialy to 100% and then only recharge if battery voltage falls below a point and only Hold it at this voltage and don’t try charge it more.

For example a single li-ion cell connected to a 3,9V power supply will happily stay at this voltage without consuming power.