I see that this device has a big issue of charging time.
Watts to charge depend on maximum charging setting.
But at the same time watts of charging are different.
Max 1200W charge - 156W charge on battery level 12% or 28%.
If set max 1800w - 256w at the same battery level.
This is unnormal.
Ecoflow charging by max value till to 99%. Than it is lower to 200W to fit 100%.
Zendure it is something like mistake.

