I spent like 300k changing and buying some batteries, now on the average i am on inverter 60 to 70 percent of the time, prior to thiis when diesel was 320,i was using like 12 to 15k diesel daily, on making adjustments, i went down to 5-6k usage, now that its btw 430 to 550,i spend like 7k5, i get lucky some days and use only 2k diesel depending on the timing, bare it in mind that during work hours 9am to like 9pm,i usually get 3 hours power supples, on a lucky day i get up to 5 hours, at unlucky periods, no supply for 2 to 3 days.