DESS Throttling PV when battery not charged

I have let the run for over 24 hours and it appears to make no sense?

Whilst the battery is discharged the pv is throttling attempting to match house hold loads

T have turn DESS back off and the PV is back up to full output.

Any ideas?

Target SOC is 23% at present which is throttling PV. With DESS off the solar goes from 800w to 4500w. Is DESS stable for anyone at the moment?