Hi Torigo
Welcome in the Avalon world!!
1) The StarGO can work till to 18V but I suggest to work till to 16V at least
2) As already explained from JG you can use the power supply that comes with the mount as step-up DC-DC converter, so you can use the 12V as input power
Anyway you can still use the 12V directly, but in this case I suggest to reduce the max slew speed to Fast or Medium to avoid to loose the mount position, due to the stepper driver low voltage
3) The mount and the StarGO can work in high humidity conditions without problems, anyway, if you can protect the StarGO electronic box, it is surely a better situation...
4) In our Support page you can find the Install_StarGo_610_NFlip_Beta.exe installer, in this version the StarGO start with the Meridian Flip feature disabled as default and it should work also by using INDI, just try it and let me know about
For the ST4 parameter, I must check if it will be possible to store it in memory.... I'll let you know about
Clear skies!
Luciano
Avalon Instruments Team