I have an EB70 which “Appears” to have charging issues. With the EB70 discharged, I connected to my automobile (12V system) and EB70 appears to charge great (about 105 watts). I have a Toyota Hylander Hybrid. When I’m parked the engine is usually off so car battery alternator is not running. When I start driving the input to the EB70 drops to 50-60 watts. It consistently does this.
I would think when driving with engine on (alternator charging car battery) the input voltage will go up from about 12V to 13+ volts. I have not measured the actual voltage to the input of the Bluetti but with the assumption of the input voltage increasing the EB70 appears to throttle back the input current to the system. I’m not sure how the MPPT controller on this system works. I would hope when it reaches the max current it doesn’t throttle back as a step function!
If I have a defective unit, I will replace (warranty). If it is a design issue with the EB70 MPPT controller I will return unit.