Today I completed the first step of my solar install. New torklift battery box with (4) 6 volt Trojan t-105’s. So I had everything wired up and the last thing to connect was the inverter cables (aims 2500w 12v) they are 1/0 with clean terminals. My mistake was in my haste and being tired I hooked up the negative cable first then positive. Small spark but nothing more after that. When I went to test the systems, DC worked but my inverter would not come on. Only a regular beeping. So I’m concerned I either blew my 300 amp fuse with the spark (seems unlikely) or I have some other issue. All were functioning correctly prior to battery swap. All battery connections are with 2/0 cables.