My LiFeP04 battery came in a few days ago. I was waiting for some other parts (mostly wire and a crimping tool and some nice copper lugs) to do the first test. I found an old incandescent light in the shed to use for a load. Maybe 50W. 10 AWG wire seems a bit too big for the Victron Controller but I did as best as I could.

Decided to do the first test outside, far from the house, just in case. Test started well but after maybe a minute everything stops. Dang. Got out the volt meter. Battery ok. Nothing feels hot. No smoke or burning smell. Looked at the Victron app. Hmmm. I guess default was 24V. My battery is more like 12V. Not really, but closer than 24V. Also set up for LiFeP04, which is what I am actually using. Flipped the switch and all seems good. Need a bit more wire to connect up the panels. Maybe tomorrow of the next day. Also need mounting hardware. Probably using some aluminum angle iron to attach the two panels to the fence.