What would be the ideal settings/recommendations for SOC for the Venus GX/MPPT to maximise the use of solar power and minimise the use of (expensive) grid or generator power on a yacht. Details: battery OPzS 980 Ah, Victron Quattro 24/8000, MPPT 100/50, 4 x 350 Wp solar array, grid 230 V 16 A, generator 4 Kw.
During the day there is a discharge of about 4.1 Kwh when not present. When just visiting during the day and using some equipment discharge will lead up to 5-6 Kwh. Fully living on the yacht will lead up to 9-10 Kwh per day. Yacht is fully equipped with fridge/freeze, oven, dishwasher, microwave, combination washing machine/dryer, central heating, led lights, etc.
My idea was to let consumers discharge the battery to 40 % before the grid/generator kicks in and the Quattro will start charging. Should the Quattro then charge to say 70 % and let the solar take over to charge to 100 %? Or maybe it is better to let the Quattro charge to 100 %?
Any thoughts?