Had an odd glitch on Friday: the off-grid solar controller had been showing green ("full") Thursday night but on Friday morning even though I was seeing 12V and the batteries were charging the LVD cut-out. Its threshold is set to 11.5V.
I assume that one of the new connections wasn't great so I went and tightened everything again.
As you see the SLA system recovered by itself in a few hours. I put my server back on grid in the gap. The LiFePO4 gave me long enough to notice and switch over gracefully.
Anyhow, today was quite a good day for solar so the batteries have had a decent charge and our grid-tie system probably generated more than we consumed today (first time this year).
Rgds
Damon
PS. Thought my controller was cooking my gel batteries trying to float them at about 14.5V instead of 14.0V, but then I realised that temp where they are is just about 0C, so with temp comp that's fine. Until now my main SLA set has been inside and thus much nearer the nominal 25C of the uncompensated set points.