Hi,
Thanks, that clears up two out of four questions, great.
Where in the datasheet does it say 2V max? I take it you mean the field that says EN High-Level Input Voltage 2V min, 20V max. That's where the doubt came from: 2V threshold for fully enabled or 2V starting threshold, and graphs tail off around 0.7V; I normally tie it to V+/same voltage level so never had to consider that before.
Oops, about the schematic, thanks for pointing it out, I copied layout from my initial rough plan drawing on paper, not what is the partial circuit on breadboard/in simulator... Couldn't simulate this specific LDO as it has no Spice/Tina model
Good call about supervisor ICs, thanks.
Reason for disabling LDO is a) for a circuit only used in daylight hours, and b) to ensure panels are producing over minimum needed 5.3V for LDO 5V output. ...I dimly suspect reason b) is unnecessary as panels are a basically on or off r.e. voltage, not slowly going from 0V at night to 6V by midday - that is so, isn't it?
Is it okay to push an op amp 1V beyond recommended operating condidtions for 30uA or so current, if that is still 1V below max. supply ratings?