I’m using a Bluetti Elite 200 V2 power station installed in a vehicle, mainly charged through Bluetti Charger 2 (alternator), and solar.
My goal is to limit the maximum battery charge to ~90% SOC, to avoid the battery staying at 100% all the time and improve battery longevity.
I’ve tested UPS / SAI modes (PV Priority, Time Control, Custom with 20–90%), but:
The SOC high value does not act as a hard charge limit
It only changes power source priority
With Charger 2, solar, or alternator, the battery still charges to 100%
So my questions are:
Is there any way to set a real maximum charge limit (e.g. 90% SOC)?
If not, is this a firmware limitation?
Are there plans to add this feature in future updates?
I’m not trying to disconnect charging completely, just to avoid constant 100% SOC while driving.
Thanks.
If I’m not mistaken anything in the solar PV input (XT60 connector) it will harvest that energy until the battery is at 100%. PV Priority mode is nothing more than charge my battery to 100% starting at this percentage. The custom rules apply only to AC charging I believe. With that said, you should be able use a Bluetti DC Hub for Charger 2, and using the provided 50A RV Port connect an Anderson connector to an AC inverter, then on the AC side of that inverter plug the cable into the AC charge port (UPS) of the Bluetti. The custom SOC limits you set should then apply, provided firmware is not bugged out.
Regarding EL200, it isn’t able to control the charging SOC. This issue is not related to C2.
Also, the Elite 200V2 BMS has built-in protection, so there’s no need to worry about overcharging damaging the battery.
Thank you very much, I had already seen your video, but this way we would introduce more losses and another device that I don’t currently have, as well as needing space to install it. Another option that is more feasible for me right now is to install a contactor and control it so that it remains closed until the desired SOC%, and then open it, thus stopping the charging whenever we want…