I Got a new LIFEPO4 to replace old Rolls FLA's. Initially inverter LEDs flash and go off. I allowed the battery to charge and now it is at 54V. However, inverter does not come on after LEDs flash, and low battery LED remains on. This inverter does not accept AC so I can't connect MK3. There is no load on this Inverter. The fuse is good with continuity, but I also bypassed it to ensure, and same issue. I also tried the inverter on another LIFEPO4 battery but same issue. This battery is 49.1V, 49% SOC