Hi, I would appreciate some help on minimum battery sizing on a AC coupled system(linked to grid and generator - no feed back is allowed), we also have 4 x 250/100 Victron MPPT's contributing to the micro-grid system. I have recently taken over this system and it was sized by someone else. I am pretty sure the batteries quoted are not the correct minimum battery size.
There are three 10kva Quattro's, 1 x Fronius Symo 15kva 3phase, the above MPPT's and 28.8 kwp pv power. 14.4kwp is on the fronius and the rest split between the MPPT's. Am i right in thinking that the minimum battery size for this system would be approximately 92kwh? The batteries we are using are Blue Nova lithium batteries. Any help and advice would be appreciated. Thanks.