I replaced my existing PWM controller, which works fine, with a Victron MPPT 75 I 10 in order to get better yield in winter.
After installation Green and Yellow LEDs BOTH blink permanently
Checked battery and panel voltages - within range.
Tried with different battery but problem persists.
Tried different jumper settings (and none).
Reverted to PWM all OK.
It looks as though I must be missing something basic (like a reset button?) with the Victron?