Off grid systems for max economy

Okay then here goes but I know I have to be careful what I say, I read some pretty weird stuff that you blokes put on the forum, but I know you are some of the most knowledgeable people in the country when it comes to solar energy.
My knowledge of electronics comes from amateur radio.
And I have no connection professionally with the solar industry it is purely a hobby
The boxes on the wall from right to left,
First there is a 100 amp isolation switch for the solar array,
Next is the outback 80 amp control unit this will take over 100 V and any excess Volts is converted into extra charge and because all my solar panels are paired it normally receives about 80 V depending on the temperature of the panels best day last year it handled 82 amps. the house needs about 350 AMP’s per day so there will often be an excess but that can always be used charging my electric Berlingo
I’m sure most of you recognise this Studer inverter charger it will give a good 7 kW of power to run the house and when needed 90 amps of charge. I recently developed problems with inverter charger when the power panel blew the capacitors and about 10 switching diodes a new panel arrived from Switzerland within four days it was installed and working well.
The large grey box is my control system in there is a time clock, some solid-state relays and two large contactors for Switching between the grid and inverter, the contactors have to have a power supply Independent of the grid and inverter because it is possible that these sources of power can drop out so by using a DC to DC converter supplying a 24 V sine wave 600 W inverter this gives an independent supply. The DC to DC converter only needs a minimum of 30 V Input and it would be very rare that my battery bank would ever dropped to this level the inverter monitors the input and gives a warning of low supply giving me the opportunity to switch to grid
The DC generator is run by a three cylinder Perkins diesel and a pair of 24 V alternators this I built in 2007 as a winter project it works well and delivers 80 amps of charge to the battery bank it was tricky using two alternators as they had to be Isolated from each other. At first I tried V belt pulleys but they slipped under heavy load and I had to Use toothed belts, and when it is running the radiator heats the garage beautifully. In the winter we Don’t get enough charge from the solar panels and a bad day will only produce about 45 amps well short of the required amount so I can set the time clock to switch on at midnight and charge my battery bank on economy7 so even in winter at worst I pay a little for economy seven or nothing at all.
The solar array, Sanyo 210 watt panels 40 V totalling about 4 kW and last year it did achieve 3.8 kW recorded in early June, for this year I intend to add four more panels to the west side of the roof to raise the overall average per day.