Semi-offgrid. Using grid as a backup on AC2IN. 9.5kva Lister TS2 (AC1IN) running on used engine oil to charge 4xUS500 . Quattro, RS450/200, 3kw Solar will be getting more, 500w hydro electric. Having to go DIY route living on a small island, no installer either knows sufficient to handle my unusual system or can be bothered. Steep learning curve with no prior electrical experience!