if you look at page 31 of the manual under 'off-grid 1' I have indicated in red the options I think you need to select for the settings in bold black to meet your requirement. It is possible to set up for timed utility charging of the battery using normal rate or perhaps timed off-peak electricity if available. In all cases below the inverter is in the off grid mode which means it is not feeding electricity back into the French electricity network. There is a nice feature whereby if you go over 5kW the utility supply steps in so you might consider only using one hybrid inverter if you only occasionally exceed 5kW or not for long or both: - the item in italics:
PV energy supply priority setting: 1st Load, 2nd Battery
PV power will provide power to the load first and then charge battery. Feed-in to
the grid is not allowed under this mode. At the same time, the grid relay is
connected in Inverter mode. That means the transfer time from inverter mode to
battery mode will be less than 15ms. Besides, it will avoid overload fault because
grid can supply load when connected load is over 5KW.
Battery charging source:
1. PV or Grid: If there is remaining PV power after supporting the loads, it will charge
battery first. Only until PV power is not available, grid will charge battery. (Default)
2. PV only: It is only allow PV power to charge battery.
3. None: It is not allowed to charge battery no matter it’s PV power or grid.
Load supply source:
When PV power is available:
1. 1st PV, 2nd Battery, 3rd Grid (Default)
PV power will provide power to the load first. If it’s not sufficient, battery power will
provide power to the load. When battery power is running out or not available, grid
will back up the load.
2. 1st PV, 2nd Grid, 3rd Battery
PV power will provide power to the load first. If it’s not sufficient, grid will provide
power to the load. If grid is not available at the same time, battery power will back
up.
When PV power is not available:
1. 1st Grid, 2nd Battery
Grid will provide power to the load at first. If grid is not available, battery power will
32
provide power backup.
2. 1st Battery, 2nd Grid (Default)
Battery power will provide power to the load at first. If battery power is running out,
grid will back up the load.
NOTE: This option will become ineffective during AC charging time and the priority
will automatically become 1st Grid and 2nd Battery order. Otherwise, it will cause
battery damage.
I have worked out a diagram showing my intended set-up using your advice - using all 38 panels and both inverters. I hope that it is all in order (and would appreciate any advice you would have to offer, as you have done so well up till now!).
Thank-you again for your ongoing help and expert advice.