How does UPS mode work on the AC2P through DC power?
It seems to me that the station doesn’t have such a capability at all, since the load is connected, but there’s no power consumption from the grid. However, every few minutes, the station discharges to 99%, then charges to 100%, and disconnects from the grid.
Why is that?
I was planning to use 12V DC power to get a few extra hours, as using the inverter consumes more energy, but for some reason, this doesn’t work.
Can the station operate in this mode for an extended period of time?
Will this mode of operation affect the battery life cycles?
The Power gets passed thru, but the internals of the powerstation also consumes energy. Thats why it discharge to 99%. The Powerstation detect that loss of 1% and recharge it to the configured 100% SoC.
A full battery cycle means a full charge from 0% - 100% and discharge from 100% to 0%.
These powerstation are designed to operate as UPS, so dont see any issue with it to actual use it.
I mean something slightly different.
Why is there no pass-through charging mode, meaning direct power transfer from the DC input to the DC outputs or from the AC input to the DC outputs, bypassing the battery so that it is not involved?
I still can’t find information on how short charge cycles of 100-99-100% affect the battery’s condition.
In one response, it is stated that such behavior does not affect the battery’s lifespan:
While in another, it is mentioned that there is an impact:
The point is that on my station, one 100-99-100% cycle occurs every 20 minutes, which totals 72 cycles per day, and this raises concerns.
As far as i understand the problem is actually that its “just” a passthrough. Atleast for AC. The drop from 100% to 99% actually doesnt come from the UPS feature, its just the selfconsumption of the unit itself. In order to minimize the effect, the battery needs to be bigger or the selfconsumption less.
For now, AC bypass the exact needed power from AC source to AC Inverter of the unit.
I see no real way, how to solve that, other the two mentioned points. holding the powerstation on 100% all the time also damage the cells, maybe even more than cycles
Hi @Dmytro_R, actually, the AC2P support bypass charging, can be charged and discharged at the same time. Please rest assured.
Thank you for @Selfmadestrom’s answer, that is correct.
The AC2P stops charging once it reaches 100% to prevent overcharging. It will resume charging only when the battery level drops to 99%. This is normal behavior. Stopping charging after reaching full capacity does not harm the battery. On the contrary, overcharging can damage the battery, so the automatic stop is a protective measure.
It will not affect the battery life cycles, so you can use it with confidence.
Thank you, I understand the concept of pass-through charging, but my concerns are more about the short charge cycles of the battery, specifically from 100% to 99% and back to 100%.
I’m worried about the impact of such short cycles on the battery’s lifespan, as I can’t find any information about how this mode of operation affects the battery’s condition.
In the examples I mentioned in my previous message, the information from customer support differs.
The only thing I managed to find is this website, but I’m not sure how reliable this information is:
Hi @Dmytro_R, Thank you for getting back to us so quickly.
We completely understand your concern and your desire to take care of your battery to ensure your Bluetti runs for as long as possible.
Please rest assured, this will not affect the lifespan of the battery. This is also a key area of focus for us. Our product design is specifically aimed at allowing customers to use the devices continuously with confidence.
The website you mentioned may be more theory-based, while our advice is grounded in real-world usage and testing, which better reflects the specific conditions of our products.
