I've got 150Ah of batteries (wired up in 2 series arrays at 24V, arrays wired in parallel). Because the weather was rubbish yesterday my 300W of panels only hit 100W peak, but I went into the night with about 23V and discharging slowly.
At 3am, my batteries dropped from 22V to 14V in the space of an hour and everything went offline.
Is this normal behaviour? If so, is there a way I can avoid it happening again?
My SmartSolar charger is a 100//15 so I could feasibly add another panel to help charge it, but that doesn't explain the batteries behaving weirdly.