Gordon, Sep 29.
Ap12 had not worked well since it was deployed. It died at night, when early every morning due to low voltage. During the night the measured station voltage, Vdsm, would dive down to a cutoff at 11.3 V, from an apparent healthy 14 V when being charged during the day.
...
Brought the system to the trailer and could not find anything wrong. Voltages all OK. Decided that the problem must be that the charge controller could not deliver sufficient power. Kurt replaced the controller and the system powered up at 16:48 MDT (per the times in the archive). It has run through the night.
Gordon, later on Sep 29:
Turns out that 12 was affected by the lightning. It quit reporting, both via network an to its local storage right at the time of the strike, Sep 27, 21:03:05 UTC.